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Nook XPR Ballscrews

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  • Ray Livingston
    I finally had a chance today to play with the ballscrews I bought for the CNC conversion on my knee mill. I bought the Nook XPR screw stock, which is rolled,
    Message 1 of 15 , Feb 3, 2008
    • 0 Attachment
      I finally had a chance today to play with the ballscrews I bought
      for the CNC conversion on my knee mill. I bought the Nook XPR screw
      stock, which is rolled, but higher precision than other rolled stock,
      with only 0.001"/foot maximum lead error, as opposed to the
      0.004"/foot for the more pedestrian screws, and 0.0005"/foot for the
      *very* expensive ground screws. The appearance is much more like
      ground stock, being smooth and a raw steel finish, as opposed to the
      more typical black oxide finish on most rolled screws. They are
      considerably smoother than standard rolled stock as well, even dry.
      This is really beautiful stuff, and very well worth the small
      additional cost.
      Since I'm fabricating my own double-nut assemblies, I've been
      agonizing for months over exactly how to provide the necessary pre-
      load. This is typically done with a Belleville spring between the
      two nuts, providing on the order of 150-300 pounds of opposing force
      between the nuts. However, after playing with the actual nuts and
      screws, I am going to eliminate the spring, and simply rigidly mount
      both nuts, rotating one of them against the screw to provide the pre-
      load. The screws are accurate enough that the motion is still very
      smooth and consistent over the full length of the screw, with
      absolutely *zero* backlash. I tested this by putting both nuts on a
      screw, tightening them against each other as tight as I could by
      hand, clamping the nuts in my vise, then using a dial indicator to
      attempt to measure the backlash in the screw. There was none, nada,
      zero, zip, zilch! There may be some very small penalty in terms of
      service life, but for a hobby machine, it'll never see enough service
      to come within even 50% of the theoretical service life anyway. I
      suspect contamination and corrosion will be far greater risks. And
      even if they do eventually fail, many years from now, new ones are
      not all that expensive (I paid $650 for all three screws - two 1" and
      one 5/8" - and all six nuts). Worst case maybe I have to replace
      them in 15 years. Who cares? This approach makes the fabrication of
      the double nut assemblies absolutely trivial.
      Nook did send me the wrong screw for the Z axis (0.250" lead
      instead of the 0.200" lead I ordered), but I'm sure they will
      straighten that out quickly. They've been very responsive so far.
      This whole conversion is going to be FAR easier, and FAR better,
      than the one I did on my mini-mill!

      Regards,
      Ray L.
    • Mike Payson
      Hi Ray, I m not sure if you mentioned this in a previous post, but can you tell me where you bought these from? We have a Jet mill (Bridgeport clone) at work,
      Message 2 of 15 , Feb 3, 2008
      • 0 Attachment
        Hi Ray,

        I'm not sure if you mentioned this in a previous post, but can you tell me where you bought these from? We have a Jet mill (Bridgeport clone) at work, and we've talked about eventually doing a CNC conversion on it. Sounds like these are the way to go.

        Thanks!

        On Feb 3, 2008 11:06 AM, Ray Livingston <jagboy1964@...> wrote:
           I finally had a chance today to play with the ballscrews I bought
        for the CNC conversion on my knee mill.  I bought the Nook XPR screw
        stock, which is rolled, but higher precision than other rolled stock,
        with only 0.001"/foot maximum lead error, as opposed to the
        0.004"/foot for the more pedestrian screws, and 0.0005"/foot for the
        *very* expensive ground screws.  The appearance is much more like
        ground stock, being smooth and a raw steel finish, as opposed to the
        more typical black oxide finish on most rolled screws.  They are
        considerably smoother than standard rolled stock as well, even dry.
        This is really beautiful stuff, and very well worth the small
        additional cost.
           Since I'm fabricating my own double-nut assemblies, I've been
        agonizing for months over exactly how to provide the necessary pre-
        load.  This is typically done with a Belleville spring between the
        two nuts, providing on the order of 150-300 pounds of opposing force
        between the nuts.  However, after playing with the actual nuts and
        screws, I am going to eliminate the spring, and simply rigidly mount
        both nuts, rotating one of them against the screw to provide the pre-
        load.  The screws are accurate enough that the motion is still very
        smooth and consistent over the full length of the screw, with
        absolutely *zero* backlash.  I tested this by putting both nuts on a
        screw, tightening them against each other as tight as I could by
        hand, clamping the nuts in my vise, then using a dial indicator to
        attempt to measure the backlash in the screw.  There was none, nada,
        zero, zip, zilch!  There may be some very small penalty in terms of
        service life, but for a hobby machine, it'll never see enough service
        to come within even 50% of the theoretical service life anyway.  I
        suspect contamination and corrosion will be far greater risks.  And
        even if they do eventually fail, many years from now, new ones are
        not all that expensive (I paid $650 for all three screws - two 1" and
        one 5/8" - and all six nuts).  Worst case maybe I have to replace
        them in 15 years.  Who cares?  This approach makes the fabrication of
        the double nut assemblies absolutely trivial.
           Nook did send me the wrong screw for the Z axis (0.250" lead
        instead of the 0.200" lead I ordered), but I'm sure they will
        straighten that out quickly.  They've been very responsive so far.
           This whole conversion is going to be FAR easier, and FAR better,
        than the one I did on my mini-mill!

        Regards,
        Ray L.




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      • Ray Livingston
        Mike, I ordered directly from Nook. I couldn t find any other source that stocked everything I wanted, and their prices were competitive. Just go to their
        Message 3 of 15 , Feb 3, 2008
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          Mike,

          I ordered directly from Nook. I couldn't find any other source
          that stocked everything I wanted, and their prices were competitive.
          Just go to their website and submit a quote. You'll then be in touch
          with Catherine Kastelic, their Internet sales person, who is a
          pleasure to work with.
          Keep in mind, these are not "made" for my machine. I just bought
          lengths of screw stock, and loose nuts, and will do the screw
          machining and double-nut fabrication myself, but neither is
          particularly challenging if you've got appropriate equipment.

          Regards,
          Ray L.


          --- In GrizHFMinimill@yahoogroups.com, "Mike Payson" <mike@...> wrote:
          >
          > Hi Ray,
          >
          > I'm not sure if you mentioned this in a previous post, but can you
          tell me
          > where you bought these from? We have a Jet mill (Bridgeport clone)
          at work,
          > and we've talked about eventually doing a CNC conversion on it.
          Sounds like
          > these are the way to go.
          >
          > Thanks!
          >
          > On Feb 3, 2008 11:06 AM, Ray Livingston <jagboy1964@...> wrote:
          >
          > > I finally had a chance today to play with the ballscrews I
          bought
          > > for the CNC conversion on my knee mill. I bought the Nook XPR
          screw
          > > stock, which is rolled, but higher precision than other rolled
          stock,
          > > with only 0.001"/foot maximum lead error, as opposed to the
          > > 0.004"/foot for the more pedestrian screws, and 0.0005"/foot for
          the
          > > *very* expensive ground screws. The appearance is much more like
          > > ground stock, being smooth and a raw steel finish, as opposed to
          the
          > > more typical black oxide finish on most rolled screws. They are
          > > considerably smoother than standard rolled stock as well, even
          dry.
          > > This is really beautiful stuff, and very well worth the small
          > > additional cost.
          > > Since I'm fabricating my own double-nut assemblies, I've been
          > > agonizing for months over exactly how to provide the necessary
          pre-
          > > load. This is typically done with a Belleville spring between the
          > > two nuts, providing on the order of 150-300 pounds of opposing
          force
          > > between the nuts. However, after playing with the actual nuts and
          > > screws, I am going to eliminate the spring, and simply rigidly
          mount
          > > both nuts, rotating one of them against the screw to provide the
          pre-
          > > load. The screws are accurate enough that the motion is still
          very
          > > smooth and consistent over the full length of the screw, with
          > > absolutely *zero* backlash. I tested this by putting both nuts
          on a
          > > screw, tightening them against each other as tight as I could by
          > > hand, clamping the nuts in my vise, then using a dial indicator to
          > > attempt to measure the backlash in the screw. There was none,
          nada,
          > > zero, zip, zilch! There may be some very small penalty in terms
          of
          > > service life, but for a hobby machine, it'll never see enough
          service
          > > to come within even 50% of the theoretical service life anyway. I
          > > suspect contamination and corrosion will be far greater risks.
          And
          > > even if they do eventually fail, many years from now, new ones are
          > > not all that expensive (I paid $650 for all three screws - two 1"
          and
          > > one 5/8" - and all six nuts). Worst case maybe I have to replace
          > > them in 15 years. Who cares? This approach makes the
          fabrication of
          > > the double nut assemblies absolutely trivial.
          > > Nook did send me the wrong screw for the Z axis (0.250" lead
          > > instead of the 0.200" lead I ordered), but I'm sure they will
          > > straighten that out quickly. They've been very responsive so far.
          > > This whole conversion is going to be FAR easier, and FAR
          better,
          > > than the one I did on my mini-mill!
          > >
          > > Regards,
          > > Ray L.
          > >
          > >
          > >
          > >
          > > Yahoo! Groups Links
          > >
          > >
          > >
          > >
          >
        • Ray Livingston
          OK, this is truly bizarre.... I ordered three screws, two were 1 OD, 0.250 lead the third was 5/8 OD, 0.200 lead. When I unpacked them all, I found the
          Message 4 of 15 , Feb 4, 2008
          • 0 Attachment
            OK, this is truly bizarre.... I ordered three screws, two were 1"
            OD, 0.250" lead the third was 5/8" OD, 0.200" lead. When I unpacked
            them all, I found the 5/8" screw I received was actually 0.250"
            lead. So, I e-mailed Nook, and informed them they had sent me the
            wrong part. The response was "Nook doesn't manufacture a 5/8" screw
            with 0.250" lead! WTF?? So how did they manage to ship me something
            they don't even manufacture???

            Regards,
            Ray L.


            --- In GrizHFMinimill@yahoogroups.com, "Ray Livingston"
            <jagboy1964@...> wrote:
            >
            > Mike,
            >
            > I ordered directly from Nook. I couldn't find any other source
            > that stocked everything I wanted, and their prices were
            competitive.
            > Just go to their website and submit a quote. You'll then be in
            touch
            > with Catherine Kastelic, their Internet sales person, who is a
            > pleasure to work with.
            > Keep in mind, these are not "made" for my machine. I just
            bought
            > lengths of screw stock, and loose nuts, and will do the screw
            > machining and double-nut fabrication myself, but neither is
            > particularly challenging if you've got appropriate equipment.
            >
            > Regards,
            > Ray L.
            >
            >
            > --- In GrizHFMinimill@yahoogroups.com, "Mike Payson" <mike@> wrote:
            > >
            > > Hi Ray,
            > >
            > > I'm not sure if you mentioned this in a previous post, but can
            you
            > tell me
            > > where you bought these from? We have a Jet mill (Bridgeport
            clone)
            > at work,
            > > and we've talked about eventually doing a CNC conversion on it.
            > Sounds like
            > > these are the way to go.
            > >
            > > Thanks!
            > >
            > > On Feb 3, 2008 11:06 AM, Ray Livingston <jagboy1964@> wrote:
            > >
            > > > I finally had a chance today to play with the ballscrews I
            > bought
            > > > for the CNC conversion on my knee mill. I bought the Nook XPR
            > screw
            > > > stock, which is rolled, but higher precision than other rolled
            > stock,
            > > > with only 0.001"/foot maximum lead error, as opposed to the
            > > > 0.004"/foot for the more pedestrian screws, and 0.0005"/foot
            for
            > the
            > > > *very* expensive ground screws. The appearance is much more
            like
            > > > ground stock, being smooth and a raw steel finish, as opposed
            to
            > the
            > > > more typical black oxide finish on most rolled screws. They are
            > > > considerably smoother than standard rolled stock as well, even
            > dry.
            > > > This is really beautiful stuff, and very well worth the small
            > > > additional cost.
            > > > Since I'm fabricating my own double-nut assemblies, I've been
            > > > agonizing for months over exactly how to provide the necessary
            > pre-
            > > > load. This is typically done with a Belleville spring between
            the
            > > > two nuts, providing on the order of 150-300 pounds of opposing
            > force
            > > > between the nuts. However, after playing with the actual nuts
            and
            > > > screws, I am going to eliminate the spring, and simply rigidly
            > mount
            > > > both nuts, rotating one of them against the screw to provide
            the
            > pre-
            > > > load. The screws are accurate enough that the motion is still
            > very
            > > > smooth and consistent over the full length of the screw, with
            > > > absolutely *zero* backlash. I tested this by putting both nuts
            > on a
            > > > screw, tightening them against each other as tight as I could by
            > > > hand, clamping the nuts in my vise, then using a dial indicator
            to
            > > > attempt to measure the backlash in the screw. There was none,
            > nada,
            > > > zero, zip, zilch! There may be some very small penalty in
            terms
            > of
            > > > service life, but for a hobby machine, it'll never see enough
            > service
            > > > to come within even 50% of the theoretical service life
            anyway. I
            > > > suspect contamination and corrosion will be far greater risks.
            > And
            > > > even if they do eventually fail, many years from now, new ones
            are
            > > > not all that expensive (I paid $650 for all three screws - two
            1"
            > and
            > > > one 5/8" - and all six nuts). Worst case maybe I have to
            replace
            > > > them in 15 years. Who cares? This approach makes the
            > fabrication of
            > > > the double nut assemblies absolutely trivial.
            > > > Nook did send me the wrong screw for the Z axis (0.250" lead
            > > > instead of the 0.200" lead I ordered), but I'm sure they will
            > > > straighten that out quickly. They've been very responsive so
            far.
            > > > This whole conversion is going to be FAR easier, and FAR
            > better,
            > > > than the one I did on my mini-mill!
            > > >
            > > > Regards,
            > > > Ray L.
            > > >
            > > >
            > > >
            > > >
            > > > Yahoo! Groups Links
            > > >
            > > >
            > > >
            > > >
            > >
            >
          • Barry Young
            Hi Ray: I would assume you are planning on keeping the original pitches so that the handwheel calibrations still work. Is that right? Barry ...
            Message 5 of 15 , Feb 4, 2008
            • 0 Attachment
              Hi Ray:

              I would assume you are planning on keeping the
              original pitches so that the handwheel calibrations
              still work. Is that right?

              Barry


              --- Ray Livingston <jagboy1964@...> wrote:

              > OK, this is truly bizarre.... I ordered three
              > screws, two were 1"
              > OD, 0.250" lead the third was 5/8" OD, 0.200" lead.
              > When I unpacked
              > them all, I found the 5/8" screw I received was
              > actually 0.250"
              > lead. So, I e-mailed Nook, and informed them they
              > had sent me the
              > wrong part. The response was "Nook doesn't
              > manufacture a 5/8" screw
              > with 0.250" lead! WTF?? So how did they manage to
              > ship me something
              > they don't even manufacture???
              >
              > Regards,
              > Ray L.
              >
              >
              > --- In GrizHFMinimill@yahoogroups.com, "Ray
              > Livingston"
              > <jagboy1964@...> wrote:
              > >
              > > Mike,
              > >
              > > I ordered directly from Nook. I couldn't find
              > any other source
              > > that stocked everything I wanted, and their prices
              > were
              > competitive.
              > > Just go to their website and submit a quote.
              > You'll then be in
              > touch
              > > with Catherine Kastelic, their Internet sales
              > person, who is a
              > > pleasure to work with.
              > > Keep in mind, these are not "made" for my
              > machine. I just
              > bought
              > > lengths of screw stock, and loose nuts, and will
              > do the screw
              > > machining and double-nut fabrication myself, but
              > neither is
              > > particularly challenging if you've got appropriate
              > equipment.
              > >
              > > Regards,
              > > Ray L.
              > >
              > >
              > > --- In GrizHFMinimill@yahoogroups.com, "Mike
              > Payson" <mike@> wrote:
              > > >
              > > > Hi Ray,
              > > >
              > > > I'm not sure if you mentioned this in a previous
              > post, but can
              > you
              > > tell me
              > > > where you bought these from? We have a Jet mill
              > (Bridgeport
              > clone)
              > > at work,
              > > > and we've talked about eventually doing a CNC
              > conversion on it.
              > > Sounds like
              > > > these are the way to go.
              > > >
              > > > Thanks!
              > > >
              > > > On Feb 3, 2008 11:06 AM, Ray Livingston
              > <jagboy1964@> wrote:
              > > >
              > > > > I finally had a chance today to play with
              > the ballscrews I
              > > bought
              > > > > for the CNC conversion on my knee mill. I
              > bought the Nook XPR
              > > screw
              > > > > stock, which is rolled, but higher precision
              > than other rolled
              > > stock,
              > > > > with only 0.001"/foot maximum lead error, as
              > opposed to the
              > > > > 0.004"/foot for the more pedestrian screws,
              > and 0.0005"/foot
              > for
              > > the
              > > > > *very* expensive ground screws. The
              > appearance is much more
              > like
              > > > > ground stock, being smooth and a raw steel
              > finish, as opposed
              > to
              > > the
              > > > > more typical black oxide finish on most rolled
              > screws. They are
              > > > > considerably smoother than standard rolled
              > stock as well, even
              > > dry.
              > > > > This is really beautiful stuff, and very well
              > worth the small
              > > > > additional cost.
              > > > > Since I'm fabricating my own double-nut
              > assemblies, I've been
              > > > > agonizing for months over exactly how to
              > provide the necessary
              > > pre-
              > > > > load. This is typically done with a
              > Belleville spring between
              > the
              > > > > two nuts, providing on the order of 150-300
              > pounds of opposing
              > > force
              > > > > between the nuts. However, after playing with
              > the actual nuts
              > and
              > > > > screws, I am going to eliminate the spring,
              > and simply rigidly
              > > mount
              > > > > both nuts, rotating one of them against the
              > screw to provide
              > the
              > > pre-
              > > > > load. The screws are accurate enough that the
              > motion is still
              > > very
              > > > > smooth and consistent over the full length of
              > the screw, with
              > > > > absolutely *zero* backlash. I tested this by
              > putting both nuts
              > > on a
              > > > > screw, tightening them against each other as
              > tight as I could by
              > > > > hand, clamping the nuts in my vise, then using
              > a dial indicator
              > to
              > > > > attempt to measure the backlash in the screw.
              > There was none,
              > > nada,
              > > > > zero, zip, zilch! There may be some very
              > small penalty in
              > terms
              > > of
              > > > > service life, but for a hobby machine, it'll
              > never see enough
              > > service
              > > > > to come within even 50% of the theoretical
              > service life
              > anyway. I
              > > > > suspect contamination and corrosion will be
              > far greater risks.
              > > And
              > > > > even if they do eventually fail, many years
              > from now, new ones
              > are
              > > > > not all that expensive (I paid $650 for all
              > three screws - two
              > 1"
              > > and
              > > > > one 5/8" - and all six nuts). Worst case
              > maybe I have to
              > replace
              > > > > them in 15 years. Who cares? This approach
              > makes the
              > > fabrication of
              > > > > the double nut assemblies absolutely trivial.
              > > > > Nook did send me the wrong screw for the Z
              > axis (0.250" lead
              > > > > instead of the 0.200" lead I ordered), but I'm
              > sure they will
              > > > > straighten that out quickly. They've been
              > very responsive so
              > far.
              > > > > This whole conversion is going to be FAR
              > easier, and FAR
              > > better,
              > > > > than the one I did on my mini-mill!
              > > > >
              > > > > Regards,
              > > > > Ray L.
              > > > >
              > > > >
              > > > >
              > > > >
              > > > > Yahoo! Groups Links
              > > > >
              > > > >
              > > > >
              > > > >
              > > >
              > >
              >
              >
              >
              >
              >
              > Yahoo! Groups Links
              >
              > (Yahoo! ID required)
              >
              > mailto:GrizHFMinimill-fullfeatured@yahoogroups.com
              >
              >
              >



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            • Ray Livingston
              Barry, No can do. The original X/Y screws are 0.200 lead. I can t get 0.200 lead 1 ballscrews for a reasonable price, so I m going with 0.250 lead.
              Message 6 of 15 , Feb 4, 2008
              • 0 Attachment
                Barry,

                No can do. The original X/Y screws are 0.200" lead. I can't
                get 0.200" lead 1" ballscrews for a reasonable price, so I'm going
                with 0.250" lead. Besides, ballscrews and manual operation really
                are not a good combination. The cutting forces will back-drive the
                screws if the axes are not locked. MDI and a good MPG will take the
                place of manual operation.

                Regards,
                Ray L.



                --- In GrizHFMinimill@yahoogroups.com, Barry Young <barryjyoung@...>
                wrote:
                >
                >
                >
                > Hi Ray:
                >
                > I would assume you are planning on keeping the
                > original pitches so that the handwheel calibrations
                > still work. Is that right?
                >
                > Barry
                >
                >
                > --- Ray Livingston <jagboy1964@...> wrote:
                >
                > > OK, this is truly bizarre.... I ordered three
                > > screws, two were 1"
                > > OD, 0.250" lead the third was 5/8" OD, 0.200" lead.
                > > When I unpacked
                > > them all, I found the 5/8" screw I received was
                > > actually 0.250"
                > > lead. So, I e-mailed Nook, and informed them they
                > > had sent me the
                > > wrong part. The response was "Nook doesn't
                > > manufacture a 5/8" screw
                > > with 0.250" lead! WTF?? So how did they manage to
                > > ship me something
                > > they don't even manufacture???
                > >
                > > Regards,
                > > Ray L.
                > >
                > >
                > > --- In GrizHFMinimill@yahoogroups.com, "Ray
                > > Livingston"
                > > <jagboy1964@> wrote:
                > > >
                > > > Mike,
                > > >
                > > > I ordered directly from Nook. I couldn't find
                > > any other source
                > > > that stocked everything I wanted, and their prices
                > > were
                > > competitive.
                > > > Just go to their website and submit a quote.
                > > You'll then be in
                > > touch
                > > > with Catherine Kastelic, their Internet sales
                > > person, who is a
                > > > pleasure to work with.
                > > > Keep in mind, these are not "made" for my
                > > machine. I just
                > > bought
                > > > lengths of screw stock, and loose nuts, and will
                > > do the screw
                > > > machining and double-nut fabrication myself, but
                > > neither is
                > > > particularly challenging if you've got appropriate
                > > equipment.
                > > >
                > > > Regards,
                > > > Ray L.
                > > >
                > > >
                > > > --- In GrizHFMinimill@yahoogroups.com, "Mike
                > > Payson" <mike@> wrote:
                > > > >
                > > > > Hi Ray,
                > > > >
                > > > > I'm not sure if you mentioned this in a previous
                > > post, but can
                > > you
                > > > tell me
                > > > > where you bought these from? We have a Jet mill
                > > (Bridgeport
                > > clone)
                > > > at work,
                > > > > and we've talked about eventually doing a CNC
                > > conversion on it.
                > > > Sounds like
                > > > > these are the way to go.
                > > > >
                > > > > Thanks!
                > > > >
                > > > > On Feb 3, 2008 11:06 AM, Ray Livingston
                > > <jagboy1964@> wrote:
                > > > >
                > > > > > I finally had a chance today to play with
                > > the ballscrews I
                > > > bought
                > > > > > for the CNC conversion on my knee mill. I
                > > bought the Nook XPR
                > > > screw
                > > > > > stock, which is rolled, but higher precision
                > > than other rolled
                > > > stock,
                > > > > > with only 0.001"/foot maximum lead error, as
                > > opposed to the
                > > > > > 0.004"/foot for the more pedestrian screws,
                > > and 0.0005"/foot
                > > for
                > > > the
                > > > > > *very* expensive ground screws. The
                > > appearance is much more
                > > like
                > > > > > ground stock, being smooth and a raw steel
                > > finish, as opposed
                > > to
                > > > the
                > > > > > more typical black oxide finish on most rolled
                > > screws. They are
                > > > > > considerably smoother than standard rolled
                > > stock as well, even
                > > > dry.
                > > > > > This is really beautiful stuff, and very well
                > > worth the small
                > > > > > additional cost.
                > > > > > Since I'm fabricating my own double-nut
                > > assemblies, I've been
                > > > > > agonizing for months over exactly how to
                > > provide the necessary
                > > > pre-
                > > > > > load. This is typically done with a
                > > Belleville spring between
                > > the
                > > > > > two nuts, providing on the order of 150-300
                > > pounds of opposing
                > > > force
                > > > > > between the nuts. However, after playing with
                > > the actual nuts
                > > and
                > > > > > screws, I am going to eliminate the spring,
                > > and simply rigidly
                > > > mount
                > > > > > both nuts, rotating one of them against the
                > > screw to provide
                > > the
                > > > pre-
                > > > > > load. The screws are accurate enough that the
                > > motion is still
                > > > very
                > > > > > smooth and consistent over the full length of
                > > the screw, with
                > > > > > absolutely *zero* backlash. I tested this by
                > > putting both nuts
                > > > on a
                > > > > > screw, tightening them against each other as
                > > tight as I could by
                > > > > > hand, clamping the nuts in my vise, then using
                > > a dial indicator
                > > to
                > > > > > attempt to measure the backlash in the screw.
                > > There was none,
                > > > nada,
                > > > > > zero, zip, zilch! There may be some very
                > > small penalty in
                > > terms
                > > > of
                > > > > > service life, but for a hobby machine, it'll
                > > never see enough
                > > > service
                > > > > > to come within even 50% of the theoretical
                > > service life
                > > anyway. I
                > > > > > suspect contamination and corrosion will be
                > > far greater risks.
                > > > And
                > > > > > even if they do eventually fail, many years
                > > from now, new ones
                > > are
                > > > > > not all that expensive (I paid $650 for all
                > > three screws - two
                > > 1"
                > > > and
                > > > > > one 5/8" - and all six nuts). Worst case
                > > maybe I have to
                > > replace
                > > > > > them in 15 years. Who cares? This approach
                > > makes the
                > > > fabrication of
                > > > > > the double nut assemblies absolutely trivial.
                > > > > > Nook did send me the wrong screw for the Z
                > > axis (0.250" lead
                > > > > > instead of the 0.200" lead I ordered), but I'm
                > > sure they will
                > > > > > straighten that out quickly. They've been
                > > very responsive so
                > > far.
                > > > > > This whole conversion is going to be FAR
                > > easier, and FAR
                > > > better,
                > > > > > than the one I did on my mini-mill!
                > > > > >
                > > > > > Regards,
                > > > > > Ray L.
                > > > > >
                > > > > >
                > > > > >
                > > > > >
                > > > > > Yahoo! Groups Links
                > > > > >
                > > > > >
                > > > > >
                > > > > >
                > > > >
                > > >
                > >
                > >
                > >
                > >
                > >
                > > Yahoo! Groups Links
                > >
                > > (Yahoo! ID required)
                > >
                > > mailto:GrizHFMinimill-fullfeatured@yahoogroups.com
                > >
                > >
                > >
                >
                >
                >
                >
                ______________________________________________________________________
                ______________
                > Be a better friend, newshound, and
                > know-it-all with Yahoo! Mobile. Try it now.
                http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ
                >
              • Barry Young
                OK, so why all the fuss about the pitch being other than ordered? Tis is confusing. Thanks Barry Young ...
                Message 7 of 15 , Feb 4, 2008
                • 0 Attachment
                  OK, so why all the fuss about the pitch being other
                  than ordered? Tis is confusing.

                  Thanks

                  Barry Young


                  --- Ray Livingston <jagboy1964@...> wrote:

                  > Barry,
                  >
                  > No can do. The original X/Y screws are 0.200"
                  > lead. I can't
                  > get 0.200" lead 1" ballscrews for a reasonable
                  > price, so I'm going
                  > with 0.250" lead. Besides, ballscrews and manual
                  > operation really
                  > are not a good combination. The cutting forces will
                  > back-drive the
                  > screws if the axes are not locked. MDI and a good
                  > MPG will take the
                  > place of manual operation.
                  >
                  > Regards,
                  > Ray L.
                  >
                  >
                  >
                  > --- In GrizHFMinimill@yahoogroups.com, Barry Young
                  > <barryjyoung@...>
                  > wrote:
                  > >
                  > >
                  > >
                  > > Hi Ray:
                  > >
                  > > I would assume you are planning on keeping the
                  > > original pitches so that the handwheel
                  > calibrations
                  > > still work. Is that right?
                  > >
                  > > Barry
                  > >
                  > >
                  > > --- Ray Livingston <jagboy1964@...> wrote:
                  > >
                  > > > OK, this is truly bizarre.... I ordered three
                  > > > screws, two were 1"
                  > > > OD, 0.250" lead the third was 5/8" OD, 0.200"
                  > lead.
                  > > > When I unpacked
                  > > > them all, I found the 5/8" screw I received was
                  > > > actually 0.250"
                  > > > lead. So, I e-mailed Nook, and informed them
                  > they
                  > > > had sent me the
                  > > > wrong part. The response was "Nook doesn't
                  > > > manufacture a 5/8" screw
                  > > > with 0.250" lead! WTF?? So how did they manage
                  > to
                  > > > ship me something
                  > > > they don't even manufacture???
                  > > >
                  > > > Regards,
                  > > > Ray L.
                  > > >
                  > > >
                  > > > --- In GrizHFMinimill@yahoogroups.com, "Ray
                  > > > Livingston"
                  > > > <jagboy1964@> wrote:
                  > > > >
                  > > > > Mike,
                  > > > >
                  > > > > I ordered directly from Nook. I couldn't
                  > find
                  > > > any other source
                  > > > > that stocked everything I wanted, and their
                  > prices
                  > > > were
                  > > > competitive.
                  > > > > Just go to their website and submit a quote.
                  > > > You'll then be in
                  > > > touch
                  > > > > with Catherine Kastelic, their Internet sales
                  > > > person, who is a
                  > > > > pleasure to work with.
                  > > > > Keep in mind, these are not "made" for my
                  > > > machine. I just
                  > > > bought
                  > > > > lengths of screw stock, and loose nuts, and
                  > will
                  > > > do the screw
                  > > > > machining and double-nut fabrication myself,
                  > but
                  > > > neither is
                  > > > > particularly challenging if you've got
                  > appropriate
                  > > > equipment.
                  > > > >
                  > > > > Regards,
                  > > > > Ray L.
                  > > > >
                  > > > >
                  > > > > --- In GrizHFMinimill@yahoogroups.com, "Mike
                  > > > Payson" <mike@> wrote:
                  > > > > >
                  > > > > > Hi Ray,
                  > > > > >
                  > > > > > I'm not sure if you mentioned this in a
                  > previous
                  > > > post, but can
                  > > > you
                  > > > > tell me
                  > > > > > where you bought these from? We have a Jet
                  > mill
                  > > > (Bridgeport
                  > > > clone)
                  > > > > at work,
                  > > > > > and we've talked about eventually doing a
                  > CNC
                  > > > conversion on it.
                  > > > > Sounds like
                  > > > > > these are the way to go.
                  > > > > >
                  > > > > > Thanks!
                  > > > > >
                  > > > > > On Feb 3, 2008 11:06 AM, Ray Livingston
                  > > > <jagboy1964@> wrote:
                  > > > > >
                  > > > > > > I finally had a chance today to play
                  > with
                  > > > the ballscrews I
                  > > > > bought
                  > > > > > > for the CNC conversion on my knee mill. I
                  > > > bought the Nook XPR
                  > > > > screw
                  > > > > > > stock, which is rolled, but higher
                  > precision
                  > > > than other rolled
                  > > > > stock,
                  > > > > > > with only 0.001"/foot maximum lead error,
                  > as
                  > > > opposed to the
                  > > > > > > 0.004"/foot for the more pedestrian
                  > screws,
                  > > > and 0.0005"/foot
                  > > > for
                  > > > > the
                  > > > > > > *very* expensive ground screws. The
                  > > > appearance is much more
                  > > > like
                  > > > > > > ground stock, being smooth and a raw steel
                  > > > finish, as opposed
                  > > > to
                  > > > > the
                  > > > > > > more typical black oxide finish on most
                  > rolled
                  > > > screws. They are
                  > > > > > > considerably smoother than standard rolled
                  > > > stock as well, even
                  > > > > dry.
                  > > > > > > This is really beautiful stuff, and very
                  > well
                  > > > worth the small
                  > > > > > > additional cost.
                  > > > > > > Since I'm fabricating my own double-nut
                  > > > assemblies, I've been
                  > > > > > > agonizing for months over exactly how to
                  > > > provide the necessary
                  > > > > pre-
                  > > > > > > load. This is typically done with a
                  > > > Belleville spring between
                  > > > the
                  > > > > > > two nuts, providing on the order of
                  > 150-300
                  > > > pounds of opposing
                  > > > > force
                  > > > > > > between the nuts. However, after playing
                  > with
                  > > > the actual nuts
                  > > > and
                  > > > > > > screws, I am going to eliminate the
                  > spring,
                  > > > and simply rigidly
                  > > > > mount
                  > > > > > > both nuts, rotating one of them against
                  > the
                  > > > screw to provide
                  > > > the
                  > > > > pre-
                  > > > > > > load. The screws are accurate enough that
                  > the
                  > > > motion is still
                  > > > > very
                  > > > > > > smooth and consistent over the full length
                  > of
                  > > > the screw, with
                  > > > > > > absolutely *zero* backlash. I tested this
                  > by
                  > > > putting both nuts
                  > > > > on a
                  > > > > > > screw, tightening them against each other
                  > as
                  > > > tight as I could by
                  > > > > > > hand, clamping the nuts in my vise, then
                  > using
                  > > > a dial indicator
                  > > > to
                  > > > > > > attempt to measure the backlash in the
                  > screw.
                  > > > There was none,
                  > > > > nada,
                  > > > > > > zero, zip, zilch! There may be some very
                  > > > small penalty in
                  > > > terms
                  > > > > of
                  > > > > > > service life, but for a hobby machine,
                  > it'll
                  > > > never see enough
                  > > > > service
                  > > > > > > to come within even 50% of the theoretical
                  > > > service life
                  > > > anyway. I
                  > > > > > > suspect contamination and corrosion will
                  > be
                  > > > far greater risks.
                  > > > > And
                  > > > > > > even if they do eventually fail, many
                  > years
                  > > > from now, new ones
                  > > > are
                  > > > > > > not all that expensive (I paid $650 for
                  > all
                  > > > three screws - two
                  > > > 1"
                  > > > > and
                  > > > > > > one 5/8" - and all six nuts). Worst case
                  > > > maybe I have to
                  > > > replace
                  > > > > > > them in 15 years. Who cares? This
                  > approach
                  > > > makes the
                  > > > > fabrication of
                  > > > > > > the double nut assemblies absolutely
                  > trivial.
                  > > > > > > Nook did send me the wrong screw for
                  > the Z
                  > > > axis (0.250" lead
                  > > > > > > instead of the 0.200" lead I ordered), but
                  > I'm
                  > > > sure they will
                  > > > > > > straighten that out quickly. They've been
                  > > > very responsive so
                  > > > far.
                  > > > > > > This whole conversion is going to be
                  > FAR
                  > > > easier, and FAR
                  > > > > better,
                  > > > > > > than the one I did on my mini-mill!
                  > > > > > >
                  > > > > > > Regards,
                  > > > > > > Ray L.
                  > > > > > >
                  > > > > > >
                  > > > > > >
                  > > > > > >
                  > > > > > > Yahoo! Groups Links
                  > > > > > >
                  > > > > > >
                  > > > > > >
                  > > > > > >
                  > > > > >
                  > > > >
                  > > >
                  > > >
                  > > >
                  > > >
                  > > >
                  > > > Yahoo! Groups Links
                  > > >
                  > > > (Yahoo! ID required)
                  > > >
                  > > >
                  > mailto:GrizHFMinimill-fullfeatured@yahoogroups.com
                  > > >
                  > > >
                  > > >
                  > >
                  > >
                  > >
                  > >
                  >
                  ______________________________________________________________________
                  > ______________
                  > > Be a better friend, newshound, and
                  > > know-it-all with Yahoo! Mobile. Try it now.
                  >
                  http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ
                  > >
                  >
                  >
                  >
                  >
                  >
                  > Yahoo! Groups Links
                  >
                  > (Yahoo! ID required)
                  >
                  > mailto:GrizHFMinimill-fullfeatured@yahoogroups.com
                  >
                  >
                  >



                  ____________________________________________________________________________________
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                • Ray Livingston
                  Barry, Cause ya can t screw a 5-pitch nut onto a 4-pitch screw.... Regards, Ray L. ... ______________________________________________________________________
                  Message 8 of 15 , Feb 4, 2008
                  • 0 Attachment
                    Barry,

                    'Cause ya can't screw a 5-pitch nut onto a 4-pitch screw....

                    Regards,
                    Ray L.



                    --- In GrizHFMinimill@yahoogroups.com, Barry Young <barryjyoung@...>
                    wrote:
                    >
                    >
                    >
                    > OK, so why all the fuss about the pitch being other
                    > than ordered? Tis is confusing.
                    >
                    > Thanks
                    >
                    > Barry Young
                    >
                    >
                    > --- Ray Livingston <jagboy1964@...> wrote:
                    >
                    > > Barry,
                    > >
                    > > No can do. The original X/Y screws are 0.200"
                    > > lead. I can't
                    > > get 0.200" lead 1" ballscrews for a reasonable
                    > > price, so I'm going
                    > > with 0.250" lead. Besides, ballscrews and manual
                    > > operation really
                    > > are not a good combination. The cutting forces will
                    > > back-drive the
                    > > screws if the axes are not locked. MDI and a good
                    > > MPG will take the
                    > > place of manual operation.
                    > >
                    > > Regards,
                    > > Ray L.
                    > >
                    > >
                    > >
                    > > --- In GrizHFMinimill@yahoogroups.com, Barry Young
                    > > <barryjyoung@>
                    > > wrote:
                    > > >
                    > > >
                    > > >
                    > > > Hi Ray:
                    > > >
                    > > > I would assume you are planning on keeping the
                    > > > original pitches so that the handwheel
                    > > calibrations
                    > > > still work. Is that right?
                    > > >
                    > > > Barry
                    > > >
                    > > >
                    > > > --- Ray Livingston <jagboy1964@> wrote:
                    > > >
                    > > > > OK, this is truly bizarre.... I ordered three
                    > > > > screws, two were 1"
                    > > > > OD, 0.250" lead the third was 5/8" OD, 0.200"
                    > > lead.
                    > > > > When I unpacked
                    > > > > them all, I found the 5/8" screw I received was
                    > > > > actually 0.250"
                    > > > > lead. So, I e-mailed Nook, and informed them
                    > > they
                    > > > > had sent me the
                    > > > > wrong part. The response was "Nook doesn't
                    > > > > manufacture a 5/8" screw
                    > > > > with 0.250" lead! WTF?? So how did they manage
                    > > to
                    > > > > ship me something
                    > > > > they don't even manufacture???
                    > > > >
                    > > > > Regards,
                    > > > > Ray L.
                    > > > >
                    > > > >
                    > > > > --- In GrizHFMinimill@yahoogroups.com, "Ray
                    > > > > Livingston"
                    > > > > <jagboy1964@> wrote:
                    > > > > >
                    > > > > > Mike,
                    > > > > >
                    > > > > > I ordered directly from Nook. I couldn't
                    > > find
                    > > > > any other source
                    > > > > > that stocked everything I wanted, and their
                    > > prices
                    > > > > were
                    > > > > competitive.
                    > > > > > Just go to their website and submit a quote.
                    > > > > You'll then be in
                    > > > > touch
                    > > > > > with Catherine Kastelic, their Internet sales
                    > > > > person, who is a
                    > > > > > pleasure to work with.
                    > > > > > Keep in mind, these are not "made" for my
                    > > > > machine. I just
                    > > > > bought
                    > > > > > lengths of screw stock, and loose nuts, and
                    > > will
                    > > > > do the screw
                    > > > > > machining and double-nut fabrication myself,
                    > > but
                    > > > > neither is
                    > > > > > particularly challenging if you've got
                    > > appropriate
                    > > > > equipment.
                    > > > > >
                    > > > > > Regards,
                    > > > > > Ray L.
                    > > > > >
                    > > > > >
                    > > > > > --- In GrizHFMinimill@yahoogroups.com, "Mike
                    > > > > Payson" <mike@> wrote:
                    > > > > > >
                    > > > > > > Hi Ray,
                    > > > > > >
                    > > > > > > I'm not sure if you mentioned this in a
                    > > previous
                    > > > > post, but can
                    > > > > you
                    > > > > > tell me
                    > > > > > > where you bought these from? We have a Jet
                    > > mill
                    > > > > (Bridgeport
                    > > > > clone)
                    > > > > > at work,
                    > > > > > > and we've talked about eventually doing a
                    > > CNC
                    > > > > conversion on it.
                    > > > > > Sounds like
                    > > > > > > these are the way to go.
                    > > > > > >
                    > > > > > > Thanks!
                    > > > > > >
                    > > > > > > On Feb 3, 2008 11:06 AM, Ray Livingston
                    > > > > <jagboy1964@> wrote:
                    > > > > > >
                    > > > > > > > I finally had a chance today to play
                    > > with
                    > > > > the ballscrews I
                    > > > > > bought
                    > > > > > > > for the CNC conversion on my knee mill. I
                    > > > > bought the Nook XPR
                    > > > > > screw
                    > > > > > > > stock, which is rolled, but higher
                    > > precision
                    > > > > than other rolled
                    > > > > > stock,
                    > > > > > > > with only 0.001"/foot maximum lead error,
                    > > as
                    > > > > opposed to the
                    > > > > > > > 0.004"/foot for the more pedestrian
                    > > screws,
                    > > > > and 0.0005"/foot
                    > > > > for
                    > > > > > the
                    > > > > > > > *very* expensive ground screws. The
                    > > > > appearance is much more
                    > > > > like
                    > > > > > > > ground stock, being smooth and a raw steel
                    > > > > finish, as opposed
                    > > > > to
                    > > > > > the
                    > > > > > > > more typical black oxide finish on most
                    > > rolled
                    > > > > screws. They are
                    > > > > > > > considerably smoother than standard rolled
                    > > > > stock as well, even
                    > > > > > dry.
                    > > > > > > > This is really beautiful stuff, and very
                    > > well
                    > > > > worth the small
                    > > > > > > > additional cost.
                    > > > > > > > Since I'm fabricating my own double-nut
                    > > > > assemblies, I've been
                    > > > > > > > agonizing for months over exactly how to
                    > > > > provide the necessary
                    > > > > > pre-
                    > > > > > > > load. This is typically done with a
                    > > > > Belleville spring between
                    > > > > the
                    > > > > > > > two nuts, providing on the order of
                    > > 150-300
                    > > > > pounds of opposing
                    > > > > > force
                    > > > > > > > between the nuts. However, after playing
                    > > with
                    > > > > the actual nuts
                    > > > > and
                    > > > > > > > screws, I am going to eliminate the
                    > > spring,
                    > > > > and simply rigidly
                    > > > > > mount
                    > > > > > > > both nuts, rotating one of them against
                    > > the
                    > > > > screw to provide
                    > > > > the
                    > > > > > pre-
                    > > > > > > > load. The screws are accurate enough that
                    > > the
                    > > > > motion is still
                    > > > > > very
                    > > > > > > > smooth and consistent over the full length
                    > > of
                    > > > > the screw, with
                    > > > > > > > absolutely *zero* backlash. I tested this
                    > > by
                    > > > > putting both nuts
                    > > > > > on a
                    > > > > > > > screw, tightening them against each other
                    > > as
                    > > > > tight as I could by
                    > > > > > > > hand, clamping the nuts in my vise, then
                    > > using
                    > > > > a dial indicator
                    > > > > to
                    > > > > > > > attempt to measure the backlash in the
                    > > screw.
                    > > > > There was none,
                    > > > > > nada,
                    > > > > > > > zero, zip, zilch! There may be some very
                    > > > > small penalty in
                    > > > > terms
                    > > > > > of
                    > > > > > > > service life, but for a hobby machine,
                    > > it'll
                    > > > > never see enough
                    > > > > > service
                    > > > > > > > to come within even 50% of the theoretical
                    > > > > service life
                    > > > > anyway. I
                    > > > > > > > suspect contamination and corrosion will
                    > > be
                    > > > > far greater risks.
                    > > > > > And
                    > > > > > > > even if they do eventually fail, many
                    > > years
                    > > > > from now, new ones
                    > > > > are
                    > > > > > > > not all that expensive (I paid $650 for
                    > > all
                    > > > > three screws - two
                    > > > > 1"
                    > > > > > and
                    > > > > > > > one 5/8" - and all six nuts). Worst case
                    > > > > maybe I have to
                    > > > > replace
                    > > > > > > > them in 15 years. Who cares? This
                    > > approach
                    > > > > makes the
                    > > > > > fabrication of
                    > > > > > > > the double nut assemblies absolutely
                    > > trivial.
                    > > > > > > > Nook did send me the wrong screw for
                    > > the Z
                    > > > > axis (0.250" lead
                    > > > > > > > instead of the 0.200" lead I ordered), but
                    > > I'm
                    > > > > sure they will
                    > > > > > > > straighten that out quickly. They've been
                    > > > > very responsive so
                    > > > > far.
                    > > > > > > > This whole conversion is going to be
                    > > FAR
                    > > > > easier, and FAR
                    > > > > > better,
                    > > > > > > > than the one I did on my mini-mill!
                    > > > > > > >
                    > > > > > > > Regards,
                    > > > > > > > Ray L.
                    > > > > > > >
                    > > > > > > >
                    > > > > > > >
                    > > > > > > >
                    > > > > > > > Yahoo! Groups Links
                    > > > > > > >
                    > > > > > > >
                    > > > > > > >
                    > > > > > > >
                    > > > > > >
                    > > > > >
                    > > > >
                    > > > >
                    > > > >
                    > > > >
                    > > > >
                    > > > > Yahoo! Groups Links
                    > > > >
                    > > > > (Yahoo! ID required)
                    > > > >
                    > > > >
                    > > mailto:GrizHFMinimill-fullfeatured@yahoogroups.com
                    > > > >
                    > > > >
                    > > > >
                    > > >
                    > > >
                    > > >
                    > > >
                    > >
                    >
                    ______________________________________________________________________
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                  • Barry Young
                    But they came with nuts mounted didn t they? I am not stupid. Just trying to decode what you wrote. What is the exact problem Ray? Barry ...
                    Message 9 of 15 , Feb 5, 2008
                    • 0 Attachment
                      But they came with nuts mounted didn't they? I am not
                      stupid. Just trying to decode what you wrote. What is
                      the exact problem Ray?

                      Barry


                      --- Ray Livingston <jagboy1964@...> wrote:

                      > Barry,
                      >
                      > 'Cause ya can't screw a 5-pitch nut onto a
                      > 4-pitch screw....
                      >
                      > Regards,
                      > Ray L.
                      >
                      >
                      >
                      > --- In GrizHFMinimill@yahoogroups.com, Barry Young
                      > <barryjyoung@...>
                      > wrote:
                      > >
                      > >
                      > >
                      > > OK, so why all the fuss about the pitch being
                      > other
                      > > than ordered? Tis is confusing.
                      > >
                      > > Thanks
                      > >
                      > > Barry Young
                      > >
                      > >
                      > > --- Ray Livingston <jagboy1964@...> wrote:
                      > >
                      > > > Barry,
                      > > >
                      > > > No can do. The original X/Y screws are
                      > 0.200"
                      > > > lead. I can't
                      > > > get 0.200" lead 1" ballscrews for a reasonable
                      > > > price, so I'm going
                      > > > with 0.250" lead. Besides, ballscrews and
                      > manual
                      > > > operation really
                      > > > are not a good combination. The cutting forces
                      > will
                      > > > back-drive the
                      > > > screws if the axes are not locked. MDI and a
                      > good
                      > > > MPG will take the
                      > > > place of manual operation.
                      > > >
                      > > > Regards,
                      > > > Ray L.
                      > > >
                      > > >
                      > > >
                      > > > --- In GrizHFMinimill@yahoogroups.com, Barry
                      > Young
                      > > > <barryjyoung@>
                      > > > wrote:
                      > > > >
                      > > > >
                      > > > >
                      > > > > Hi Ray:
                      > > > >
                      > > > > I would assume you are planning on keeping the
                      > > > > original pitches so that the handwheel
                      > > > calibrations
                      > > > > still work. Is that right?
                      > > > >
                      > > > > Barry
                      > > > >
                      > > > >
                      > > > > --- Ray Livingston <jagboy1964@> wrote:
                      > > > >
                      > > > > > OK, this is truly bizarre.... I ordered
                      > three
                      > > > > > screws, two were 1"
                      > > > > > OD, 0.250" lead the third was 5/8" OD,
                      > 0.200"
                      > > > lead.
                      > > > > > When I unpacked
                      > > > > > them all, I found the 5/8" screw I received
                      > was
                      > > > > > actually 0.250"
                      > > > > > lead. So, I e-mailed Nook, and informed
                      > them
                      > > > they
                      > > > > > had sent me the
                      > > > > > wrong part. The response was "Nook doesn't
                      > > > > > manufacture a 5/8" screw
                      > > > > > with 0.250" lead! WTF?? So how did they
                      > manage
                      > > > to
                      > > > > > ship me something
                      > > > > > they don't even manufacture???
                      > > > > >
                      > > > > > Regards,
                      > > > > > Ray L.
                      > > > > >
                      > > > > >
                      > > > > > --- In GrizHFMinimill@yahoogroups.com, "Ray
                      > > > > > Livingston"
                      > > > > > <jagboy1964@> wrote:
                      > > > > > >
                      > > > > > > Mike,
                      > > > > > >
                      > > > > > > I ordered directly from Nook. I
                      > couldn't
                      > > > find
                      > > > > > any other source
                      > > > > > > that stocked everything I wanted, and
                      > their
                      > > > prices
                      > > > > > were
                      > > > > > competitive.
                      > > > > > > Just go to their website and submit a
                      > quote.
                      > > > > > You'll then be in
                      > > > > > touch
                      > > > > > > with Catherine Kastelic, their Internet
                      > sales
                      > > > > > person, who is a
                      > > > > > > pleasure to work with.
                      > > > > > > Keep in mind, these are not "made" for
                      > my
                      > > > > > machine. I just
                      > > > > > bought
                      > > > > > > lengths of screw stock, and loose nuts,
                      > and
                      > > > will
                      > > > > > do the screw
                      > > > > > > machining and double-nut fabrication
                      > myself,
                      > > > but
                      > > > > > neither is
                      > > > > > > particularly challenging if you've got
                      > > > appropriate
                      > > > > > equipment.
                      > > > > > >
                      > > > > > > Regards,
                      > > > > > > Ray L.
                      > > > > > >
                      > > > > > >
                      > > > > > > --- In GrizHFMinimill@yahoogroups.com,
                      > "Mike
                      > > > > > Payson" <mike@> wrote:
                      > > > > > > >
                      > > > > > > > Hi Ray,
                      > > > > > > >
                      > > > > > > > I'm not sure if you mentioned this in a
                      > > > previous
                      > > > > > post, but can
                      > > > > > you
                      > > > > > > tell me
                      > > > > > > > where you bought these from? We have a
                      > Jet
                      > > > mill
                      > > > > > (Bridgeport
                      > > > > > clone)
                      > > > > > > at work,
                      > > > > > > > and we've talked about eventually doing
                      > a
                      > > > CNC
                      > > > > > conversion on it.
                      > > > > > > Sounds like
                      > > > > > > > these are the way to go.
                      > > > > > > >
                      > > > > > > > Thanks!
                      > > > > > > >
                      > > > > > > > On Feb 3, 2008 11:06 AM, Ray Livingston
                      > > > > > <jagboy1964@> wrote:
                      > > > > > > >
                      > > > > > > > > I finally had a chance today to
                      > play
                      > > > with
                      > > > > > the ballscrews I
                      > > > > > > bought
                      > > > > > > > > for the CNC conversion on my knee
                      > mill. I
                      > > > > > bought the Nook XPR
                      > > > > > > screw
                      > > > > > > > > stock, which is rolled, but higher
                      > > > precision
                      > > > > > than other rolled
                      > > > > > > stock,
                      > > > > > > > > with only 0.001"/foot maximum lead
                      > error,
                      > > > as
                      > > > > > opposed to the
                      > > > > > > > > 0.004"/foot for the more pedestrian
                      > > > screws,
                      > > > > > and 0.0005"/foot
                      > > > > > for
                      > > > > > > the
                      > > > > > > > > *very* expensive ground screws. The
                      > > > > > appearance is much more
                      > > > > > like
                      > > > > > > > > ground stock, being smooth and a raw
                      > steel
                      > > > > > finish, as opposed
                      > > > > > to
                      > > > > > > the
                      > > > > > > > > more typical black oxide finish on
                      > most
                      > > > rolled
                      > > > > > screws. They are
                      > > > > > > > > considerably smoother than standard
                      > rolled
                      > > > > > stock as well, even
                      > > > > > > dry.
                      > > > > > > > > This is really beautiful stuff, and
                      > very
                      > > > well
                      > > > > > worth the small
                      > > > > > > > > additional cost.
                      > > > > > > > > Since I'm fabricating my own
                      > double-nut
                      > > > > > assemblies, I've been
                      > > > > > > > > agonizing for months over exactly how
                      > to
                      > > > > > provide the necessary
                      > > > > > > pre-
                      > > > > > > > > load. This is typically done with a
                      > > > > > Belleville spring between
                      > > > > > the
                      > > > > > > > > two nuts, providing on the order of
                      > > > 150-300
                      > > > > > pounds of opposing
                      > > > > > > force
                      > > > > > > > > between the nuts. However, after
                      > playing
                      > > > with
                      > > > > > the actual nuts
                      > > > > > and
                      > > > > > > > > screws, I am going to eliminate the
                      > > > spring,
                      > > > > > and simply rigidly
                      > > > > > > mount
                      > > > > > > > > both nuts, rotating one of them
                      > against
                      > > > the
                      > > > > > screw to provide
                      > > > > > the
                      > > > > > > pre-
                      > > > > > > > > load. The screws are accurate enough
                      > that
                      > > > the
                      > > > > > motion is still
                      > > > > > > very
                      > > > > > > > > smooth and consistent over the full
                      > length
                      > > > of
                      > > > > > the screw, with
                      > > > > > > > > absolutely *zero* backlash. I tested
                      > this
                      > > > by
                      > > > > > putting both nuts
                      > > > > > > on a
                      > > > > > > > > screw, tightening them against each
                      > other
                      > > > as
                      > > > > > tight as I could by
                      > > > > > > > > hand, clamping the nuts in my vise,
                      > then
                      > > > using
                      > > > > > a dial indicator
                      > > > > > to
                      > > > > > > > > attempt to measure the backlash in the
                      > > > screw.
                      > > > > > There was none,
                      > > > > > > nada,
                      > > > > > > > > zero, zip, zilch! There may be some
                      > very
                      > > > > > small penalty in
                      > > > > > terms
                      > > > > > > of
                      > > > > > > > > service life, but for a hobby machine,
                      > > > it'll
                      > > > > > never see enough
                      > > > > > > service
                      > > > > > > > > to come within even 50% of the
                      > theoretical
                      > > > > > service life
                      > > > > > anyway. I
                      > > > > > > > > suspect contamination and corrosion
                      > will
                      > > > be
                      > > > > > far greater risks.
                      > > > > > > And
                      > > > > > > > > even if they do eventually fail, many
                      > > > years
                      > > > > > from now, new ones
                      > > > > > are
                      > > > > > > > > not all that expensive (I paid $650
                      > for
                      > > > all
                      > > > > > three screws - two
                      > > > > > 1"
                      > > > > > > and
                      > > > > > > > > one 5/8" - and all six nuts). Worst
                      > case
                      > > > > > maybe I have to
                      > > > > > replace
                      > > > > > > > > them in 15 years. Who cares? This
                      > > > approach
                      > > > > > makes the
                      > > > > > > fabrication of
                      > > > > > > > > the double nut assemblies absolutely
                      > > > trivial.
                      > > > > > > > > Nook did send me the wrong screw
                      > for
                      > > > the Z
                      > > > > > axis (0.250" lead
                      > > > > > > > > instead of the 0.200" lead I ordered),
                      > but
                      > > > I'm
                      > > > > > sure they will
                      > > > > > > > > straighten that out quickly. They've
                      > been
                      > > > > > very responsive so
                      > > > > > far.
                      > > > > > > > > This whole conversion is going to
                      > be
                      > > > FAR
                      > > > > > easier, and FAR
                      > > > > > > better,
                      > > > > > > > > than the one I did on my mini-mill!
                      > > > > > > > >
                      > > > > > > > > Regards,
                      > > > > > > > > Ray L.
                      > > > > > > > >
                      > > > > > > > >
                      > > > > > > > >
                      > > > > > > > >
                      > > > > > > > > Yahoo! Groups Links
                      > > > > > > > >
                      > > > > > > > >
                      > > > > > > > >
                      > > > > > > > >
                      > > > > > > >
                      > > > > > >
                      > > > > >
                      > > > > >
                      > > > > >
                      > > > > >
                      > > > > >
                      > > > > > Yahoo! Groups Links
                      > > > > >
                      > > > > > (Yahoo! ID required)
                      > > > > >
                      > > > > >
                      > > >
                      > mailto:GrizHFMinimill-fullfeatured@yahoogroups.com
                      > > > > >
                      > > > > >
                      > > > > >
                      > > > >
                      > > > >
                      > > > >
                      > > > >
                      > > >
                      > >
                      >
                      ______________________________________________________________________
                      > > > ______________
                      > > > > Be a better friend, newshound, and
                      > > > > know-it-all with Yahoo! Mobile. Try it now.
                      > > >
                      > >
                      >
                      http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ
                      > > > >
                      > > >
                      > > >
                      > > >
                      > > >
                      > > >
                      > > > Yahoo! Groups Links
                      > > >
                      > > > (Yahoo! ID required)
                      > > >
                      > > >
                      > mailto:GrizHFMinimill-fullfeatured@yahoogroups.com
                      > > >
                      > > >
                      > > >
                      > >
                      > >
                      > >
                      > >
                      >
                      ______________________________________________________________________
                      > ______________
                      > > Looking for last minute shopping deals?
                      > > Find them fast with Yahoo! Search.
                      >
                      http://tools.search.yahoo.com/newsearch/category.php?category=shopping
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                      >
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                      >
                      >
                      > Yahoo! Groups Links
                      >
                      > (Yahoo! ID required)
                      >
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                      >
                      >
                      >



                      ____________________________________________________________________________________
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                    • Ray Livingston
                      Barry, No, they didn t come with the nuts mounted. I bought raw screw stock by the inch, and pairs of unmounted single nuts. Machining of the ends, and
                      Message 10 of 15 , Feb 5, 2008
                      • 0 Attachment
                        Barry,

                        No, they didn't come with the nuts mounted. I bought raw screw
                        stock by the inch, and pairs of unmounted single nuts. Machining of
                        the ends, and fabrication of the double nut assemblies is my
                        problem. So, like I said, they sent me a 4-pitch screw, and a 5-
                        pitch nut, and that's just not a very workable combination. I
                        dunno.... Maybe I could make them work, but I'd need MUCH more
                        powerful motors.... :-)

                        Regards,
                        Ray L.




                        --- In GrizHFMinimill@yahoogroups.com, Barry Young <barryjyoung@...>
                        wrote:
                        >
                        >
                        >
                        > But they came with nuts mounted didn't they? I am not
                        > stupid. Just trying to decode what you wrote. What is
                        > the exact problem Ray?
                        >
                        > Barry
                        >
                        >
                        > --- Ray Livingston <jagboy1964@...> wrote:
                        >
                        > > Barry,
                        > >
                        > > 'Cause ya can't screw a 5-pitch nut onto a
                        > > 4-pitch screw....
                        > >
                        > > Regards,
                        > > Ray L.
                        > >
                        > >
                        > >
                        > > --- In GrizHFMinimill@yahoogroups.com, Barry Young
                        > > <barryjyoung@>
                        > > wrote:
                        > > >
                        > > >
                        > > >
                        > > > OK, so why all the fuss about the pitch being
                        > > other
                        > > > than ordered? Tis is confusing.
                        > > >
                        > > > Thanks
                        > > >
                        > > > Barry Young
                        > > >
                        > > >
                        > > > --- Ray Livingston <jagboy1964@> wrote:
                        > > >
                        > > > > Barry,
                        > > > >
                        > > > > No can do. The original X/Y screws are
                        > > 0.200"
                        > > > > lead. I can't
                        > > > > get 0.200" lead 1" ballscrews for a reasonable
                        > > > > price, so I'm going
                        > > > > with 0.250" lead. Besides, ballscrews and
                        > > manual
                        > > > > operation really
                        > > > > are not a good combination. The cutting forces
                        > > will
                        > > > > back-drive the
                        > > > > screws if the axes are not locked. MDI and a
                        > > good
                        > > > > MPG will take the
                        > > > > place of manual operation.
                        > > > >
                        > > > > Regards,
                        > > > > Ray L.
                        > > > >
                        > > > >
                        > > > >
                        > > > > --- In GrizHFMinimill@yahoogroups.com, Barry
                        > > Young
                        > > > > <barryjyoung@>
                        > > > > wrote:
                        > > > > >
                        > > > > >
                        > > > > >
                        > > > > > Hi Ray:
                        > > > > >
                        > > > > > I would assume you are planning on keeping the
                        > > > > > original pitches so that the handwheel
                        > > > > calibrations
                        > > > > > still work. Is that right?
                        > > > > >
                        > > > > > Barry
                        > > > > >
                        > > > > >
                        > > > > > --- Ray Livingston <jagboy1964@> wrote:
                        > > > > >
                        > > > > > > OK, this is truly bizarre.... I ordered
                        > > three
                        > > > > > > screws, two were 1"
                        > > > > > > OD, 0.250" lead the third was 5/8" OD,
                        > > 0.200"
                        > > > > lead.
                        > > > > > > When I unpacked
                        > > > > > > them all, I found the 5/8" screw I received
                        > > was
                        > > > > > > actually 0.250"
                        > > > > > > lead. So, I e-mailed Nook, and informed
                        > > them
                        > > > > they
                        > > > > > > had sent me the
                        > > > > > > wrong part. The response was "Nook doesn't
                        > > > > > > manufacture a 5/8" screw
                        > > > > > > with 0.250" lead! WTF?? So how did they
                        > > manage
                        > > > > to
                        > > > > > > ship me something
                        > > > > > > they don't even manufacture???
                        > > > > > >
                        > > > > > > Regards,
                        > > > > > > Ray L.
                        > > > > > >
                        > > > > > >
                        > > > > > > --- In GrizHFMinimill@yahoogroups.com, "Ray
                        > > > > > > Livingston"
                        > > > > > > <jagboy1964@> wrote:
                        > > > > > > >
                        > > > > > > > Mike,
                        > > > > > > >
                        > > > > > > > I ordered directly from Nook. I
                        > > couldn't
                        > > > > find
                        > > > > > > any other source
                        > > > > > > > that stocked everything I wanted, and
                        > > their
                        > > > > prices
                        > > > > > > were
                        > > > > > > competitive.
                        > > > > > > > Just go to their website and submit a
                        > > quote.
                        > > > > > > You'll then be in
                        > > > > > > touch
                        > > > > > > > with Catherine Kastelic, their Internet
                        > > sales
                        > > > > > > person, who is a
                        > > > > > > > pleasure to work with.
                        > > > > > > > Keep in mind, these are not "made" for
                        > > my
                        > > > > > > machine. I just
                        > > > > > > bought
                        > > > > > > > lengths of screw stock, and loose nuts,
                        > > and
                        > > > > will
                        > > > > > > do the screw
                        > > > > > > > machining and double-nut fabrication
                        > > myself,
                        > > > > but
                        > > > > > > neither is
                        > > > > > > > particularly challenging if you've got
                        > > > > appropriate
                        > > > > > > equipment.
                        > > > > > > >
                        > > > > > > > Regards,
                        > > > > > > > Ray L.
                        > > > > > > >
                        > > > > > > >
                        > > > > > > > --- In GrizHFMinimill@yahoogroups.com,
                        > > "Mike
                        > > > > > > Payson" <mike@> wrote:
                        > > > > > > > >
                        > > > > > > > > Hi Ray,
                        > > > > > > > >
                        > > > > > > > > I'm not sure if you mentioned this in a
                        > > > > previous
                        > > > > > > post, but can
                        > > > > > > you
                        > > > > > > > tell me
                        > > > > > > > > where you bought these from? We have a
                        > > Jet
                        > > > > mill
                        > > > > > > (Bridgeport
                        > > > > > > clone)
                        > > > > > > > at work,
                        > > > > > > > > and we've talked about eventually doing
                        > > a
                        > > > > CNC
                        > > > > > > conversion on it.
                        > > > > > > > Sounds like
                        > > > > > > > > these are the way to go.
                        > > > > > > > >
                        > > > > > > > > Thanks!
                        > > > > > > > >
                        > > > > > > > > On Feb 3, 2008 11:06 AM, Ray Livingston
                        > > > > > > <jagboy1964@> wrote:
                        > > > > > > > >
                        > > > > > > > > > I finally had a chance today to
                        > > play
                        > > > > with
                        > > > > > > the ballscrews I
                        > > > > > > > bought
                        > > > > > > > > > for the CNC conversion on my knee
                        > > mill. I
                        > > > > > > bought the Nook XPR
                        > > > > > > > screw
                        > > > > > > > > > stock, which is rolled, but higher
                        > > > > precision
                        > > > > > > than other rolled
                        > > > > > > > stock,
                        > > > > > > > > > with only 0.001"/foot maximum lead
                        > > error,
                        > > > > as
                        > > > > > > opposed to the
                        > > > > > > > > > 0.004"/foot for the more pedestrian
                        > > > > screws,
                        > > > > > > and 0.0005"/foot
                        > > > > > > for
                        > > > > > > > the
                        > > > > > > > > > *very* expensive ground screws. The
                        > > > > > > appearance is much more
                        > > > > > > like
                        > > > > > > > > > ground stock, being smooth and a raw
                        > > steel
                        > > > > > > finish, as opposed
                        > > > > > > to
                        > > > > > > > the
                        > > > > > > > > > more typical black oxide finish on
                        > > most
                        > > > > rolled
                        > > > > > > screws. They are
                        > > > > > > > > > considerably smoother than standard
                        > > rolled
                        > > > > > > stock as well, even
                        > > > > > > > dry.
                        > > > > > > > > > This is really beautiful stuff, and
                        > > very
                        > > > > well
                        > > > > > > worth the small
                        > > > > > > > > > additional cost.
                        > > > > > > > > > Since I'm fabricating my own
                        > > double-nut
                        > > > > > > assemblies, I've been
                        > > > > > > > > > agonizing for months over exactly how
                        > > to
                        > > > > > > provide the necessary
                        > > > > > > > pre-
                        > > > > > > > > > load. This is typically done with a
                        > > > > > > Belleville spring between
                        > > > > > > the
                        > > > > > > > > > two nuts, providing on the order of
                        > > > > 150-300
                        > > > > > > pounds of opposing
                        > > > > > > > force
                        > > > > > > > > > between the nuts. However, after
                        > > playing
                        > > > > with
                        > > > > > > the actual nuts
                        > > > > > > and
                        > > > > > > > > > screws, I am going to eliminate the
                        > > > > spring,
                        > > > > > > and simply rigidly
                        > > > > > > > mount
                        > > > > > > > > > both nuts, rotating one of them
                        > > against
                        > > > > the
                        > > > > > > screw to provide
                        > > > > > > the
                        > > > > > > > pre-
                        > > > > > > > > > load. The screws are accurate enough
                        > > that
                        > > > > the
                        > > > > > > motion is still
                        > > > > > > > very
                        > > > > > > > > > smooth and consistent over the full
                        > > length
                        > > > > of
                        > > > > > > the screw, with
                        > > > > > > > > > absolutely *zero* backlash. I tested
                        > > this
                        > > > > by
                        > > > > > > putting both nuts
                        > > > > > > > on a
                        > > > > > > > > > screw, tightening them against each
                        > > other
                        > > > > as
                        > > > > > > tight as I could by
                        > > > > > > > > > hand, clamping the nuts in my vise,
                        > > then
                        > > > > using
                        > > > > > > a dial indicator
                        > > > > > > to
                        > > > > > > > > > attempt to measure the backlash in the
                        > > > > screw.
                        > > > > > > There was none,
                        > > > > > > > nada,
                        > > > > > > > > > zero, zip, zilch! There may be some
                        > > very
                        > > > > > > small penalty in
                        > > > > > > terms
                        > > > > > > > of
                        > > > > > > > > > service life, but for a hobby machine,
                        > > > > it'll
                        > > > > > > never see enough
                        > > > > > > > service
                        > > > > > > > > > to come within even 50% of the
                        > > theoretical
                        > > > > > > service life
                        > > > > > > anyway. I
                        > > > > > > > > > suspect contamination and corrosion
                        > > will
                        > > > > be
                        > > > > > > far greater risks.
                        > > > > > > > And
                        > > > > > > > > > even if they do eventually fail, many
                        > > > > years
                        > > > > > > from now, new ones
                        > > > > > > are
                        > > > > > > > > > not all that expensive (I paid $650
                        > > for
                        > > > > all
                        > > > > > > three screws - two
                        > > > > > > 1"
                        > > > > > > > and
                        > > > > > > > > > one 5/8" - and all six nuts). Worst
                        > > case
                        > > > > > > maybe I have to
                        > > > > > > replace
                        > > > > > > > > > them in 15 years. Who cares? This
                        > > > > approach
                        > > > > > > makes the
                        > > > > > > > fabrication of
                        > > > > > > > > > the double nut assemblies absolutely
                        > > > > trivial.
                        > > > > > > > > > Nook did send me the wrong screw
                        > > for
                        > > > > the Z
                        > > > > > > axis (0.250" lead
                        > > > > > > > > > instead of the 0.200" lead I ordered),
                        > > but
                        > > > > I'm
                        > > > > > > sure they will
                        > > > > > > > > > straighten that out quickly. They've
                        > > been
                        > > > > > > very responsive so
                        > > > > > > far.
                        > > > > > > > > > This whole conversion is going to
                        > > be
                        > > > > FAR
                        > > > > > > easier, and FAR
                        > > > > > > > better,
                        > > > > > > > > > than the one I did on my mini-mill!
                        > > > > > > > > >
                        > > > > > > > > > Regards,
                        > > > > > > > > > Ray L.
                        > > > > > > > > >
                        > > > > > > > > >
                        > > > > > > > > >
                        > > > > > > > > >
                        > > > > > > > > > Yahoo! Groups Links
                        > > > > > > > > >
                        > > > > > > > > >
                        > > > > > > > > >
                        > > > > > > > > >
                        > > > > > > > >
                        > > > > > > >
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                        > > > > > >
                        > > > > > >
                        > > > > > >
                        > > > > >
                        > > > > >
                        > > > > >
                        > > > > >
                        > > > >
                        > > >
                        > >
                        >
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                      • Barry Young
                        Hi Ray: OK, now I understand what you meant to say. I think this is the post you are referring to: ******** OK, this is truly bizarre.... I ordered three
                        Message 11 of 15 , Feb 5, 2008
                        • 0 Attachment
                          Hi Ray:

                          OK, now I understand what you meant to say. I think
                          this is the post you are referring to:
                          ********
                          OK, this is truly bizarre.... I ordered three screws,
                          two were 1"
                          OD, 0.250" lead the third was 5/8" OD, 0.200" lead.
                          When I unpacked
                          them all, I found the 5/8" screw I received was
                          actually 0.250"
                          lead. So, I e-mailed Nook, and informed them they had
                          sent me the
                          wrong part. The response was "Nook doesn't manufacture
                          a 5/8" screw
                          with 0.250" lead! WTF?? So how did they manage to ship
                          me something
                          they don't even manufacture???
                          *********

                          I did not see in there where a nut had a different
                          pitch than a screw, hence my confusion. Sorry I was
                          unable to read what you meant.

                          It is too bad that you are having this problem which
                          you should not be having at all. I feel your pain.
                          Keep your eye on the prize, it is worth all of this in
                          the end. You are going to have a very nice CNC mill
                          when you are done with these inevitable bumps in the
                          road. This will really help out a lot when you are
                          working on those E type Jags.

                          Barry




                          --- Ray Livingston <jagboy1964@...> wrote:

                          > Barry,
                          >
                          > No, they didn't come with the nuts mounted. I
                          > bought raw screw
                          > stock by the inch, and pairs of unmounted single
                          > nuts. Machining of
                          > the ends, and fabrication of the double nut
                          > assemblies is my
                          > problem. So, like I said, they sent me a 4-pitch
                          > screw, and a 5-
                          > pitch nut, and that's just not a very workable
                          > combination. I
                          > dunno.... Maybe I could make them work, but I'd need
                          > MUCH more
                          > powerful motors.... :-)
                          >
                          > Regards,
                          > Ray L.
                          >
                          >
                          >
                          >
                          > --- In GrizHFMinimill@yahoogroups.com, Barry Young
                          > <barryjyoung@...>
                          > wrote:
                          > >
                          > >
                          > >
                          > > But they came with nuts mounted didn't they? I am
                          > not
                          > > stupid. Just trying to decode what you wrote. What
                          > is
                          > > the exact problem Ray?
                          > >
                          > > Barry
                          > >
                          > >
                          > > --- Ray Livingston <jagboy1964@...> wrote:
                          > >
                          > > > Barry,
                          > > >
                          > > > 'Cause ya can't screw a 5-pitch nut onto a
                          > > > 4-pitch screw....
                          > > >
                          > > > Regards,
                          > > > Ray L.
                          > > >
                          > > >
                          > > >
                          > > > --- In GrizHFMinimill@yahoogroups.com, Barry
                          > Young
                          > > > <barryjyoung@>
                          > > > wrote:
                          > > > >
                          > > > >
                          > > > >
                          > > > > OK, so why all the fuss about the pitch being
                          > > > other
                          > > > > than ordered? Tis is confusing.
                          > > > >
                          > > > > Thanks
                          > > > >
                          > > > > Barry Young
                          > > > >
                          > > > >
                          > > > > --- Ray Livingston <jagboy1964@> wrote:
                          > > > >
                          > > > > > Barry,
                          > > > > >
                          > > > > > No can do. The original X/Y screws are
                          > > > 0.200"
                          > > > > > lead. I can't
                          > > > > > get 0.200" lead 1" ballscrews for a
                          > reasonable
                          > > > > > price, so I'm going
                          > > > > > with 0.250" lead. Besides, ballscrews and
                          > > > manual
                          > > > > > operation really
                          > > > > > are not a good combination. The cutting
                          > forces
                          > > > will
                          > > > > > back-drive the
                          > > > > > screws if the axes are not locked. MDI and
                          > a
                          > > > good
                          > > > > > MPG will take the
                          > > > > > place of manual operation.
                          > > > > >
                          > > > > > Regards,
                          > > > > > Ray L.
                          > > > > >
                          > > > > >
                          > > > > >
                          > > > > > --- In GrizHFMinimill@yahoogroups.com, Barry
                          > > > Young
                          > > > > > <barryjyoung@>
                          > > > > > wrote:
                          > > > > > >
                          > > > > > >
                          > > > > > >
                          > > > > > > Hi Ray:
                          > > > > > >
                          > > > > > > I would assume you are planning on keeping
                          > the
                          > > > > > > original pitches so that the handwheel
                          > > > > > calibrations
                          > > > > > > still work. Is that right?
                          > > > > > >
                          > > > > > > Barry
                          > > > > > >
                          > > > > > >
                          > > > > > > --- Ray Livingston <jagboy1964@> wrote:
                          > > > > > >
                          > > > > > > > OK, this is truly bizarre.... I ordered
                          > > > three
                          > > > > > > > screws, two were 1"
                          > > > > > > > OD, 0.250" lead the third was 5/8" OD,
                          > > > 0.200"
                          > > > > > lead.
                          > > > > > > > When I unpacked
                          > > > > > > > them all, I found the 5/8" screw I
                          > received
                          > > > was
                          > > > > > > > actually 0.250"
                          > > > > > > > lead. So, I e-mailed Nook, and informed
                          > > > them
                          > > > > > they
                          > > > > > > > had sent me the
                          > > > > > > > wrong part. The response was "Nook
                          > doesn't
                          > > > > > > > manufacture a 5/8" screw
                          > > > > > > > with 0.250" lead! WTF?? So how did
                          > they
                          > > > manage
                          > > > > > to
                          > > > > > > > ship me something
                          > > > > > > > they don't even manufacture???
                          > > > > > > >
                          > > > > > > > Regards,
                          > > > > > > > Ray L.
                          > > > > > > >
                          > > > > > > >
                          > > > > > > > --- In GrizHFMinimill@yahoogroups.com,
                          > "Ray
                          > > > > > > > Livingston"
                          > > > > > > > <jagboy1964@> wrote:
                          > > > > > > > >
                          > > > > > > > > Mike,
                          > > > > > > > >
                          > > > > > > > > I ordered directly from Nook. I
                          > > > couldn't
                          > > > > > find
                          > > > > > > > any other source
                          > > > > > > > > that stocked everything I wanted, and
                          > > > their
                          > > > > > prices
                          > > > > > > > were
                          > > > > > > > competitive.
                          > > > > > > > > Just go to their website and submit a
                          > > > quote.
                          > > > > > > > You'll then be in
                          > > > > > > > touch
                          > > > > > > > > with Catherine Kastelic, their
                          > Internet
                          > > > sales
                          > > > > > > > person, who is a
                          > > > > > > > > pleasure to work with.
                          > > > > > > > > Keep in mind, these are not "made"
                          > for
                          > > > my
                          > > > > > > > machine. I just
                          > > > > > > > bought
                          > > > > > > > > lengths of screw stock, and loose
                          > nuts,
                          > > > and
                          > > > > > will
                          > > > > > > > do the screw
                          > > > > > > > > machining and double-nut fabrication
                          > > > myself,
                          > > > > > but
                          > > > > > > > neither is
                          > > > > > > > > particularly challenging if you've got
                          > > > > > appropriate
                          > > > > > > > equipment.
                          > > > > > > > >
                          > > > > > > > > Regards,
                          > > > > > > > > Ray L.
                          > > > > > > > >
                          > > > > > > > >
                          > > > > > > > > --- In GrizHFMinimill@yahoogroups.com,
                          > > > "Mike
                          > > > > > > > Payson" <mike@> wrote:
                          > > > > > > > > >
                          > > > > > > > > > Hi Ray,
                          > > > > > > > > >
                          > > > > > > > > > I'm not sure if you mentioned this
                          > in a
                          > > > > > previous
                          > > > > > > > post, but can
                          > > > > > > > you
                          > > > > > > > > tell me
                          > > > > > > > > > where you bought these from? We have
                          > a
                          > > > Jet
                          > > > > > mill
                          > > > > > > > (Bridgeport
                          > > > > > > > clone)
                          > > > > > > > > at work,
                          > > > > > > > > > and we've talked about eventually
                          > doing
                          > > > a
                          > > > > > CNC
                          > > > > > > > conversion on it.
                          > > > > > > > > Sounds like
                          > > > > > > > > > these are the way to go.
                          > > > > > > > > >
                          > > > > > > > > > Thanks!
                          > > > > > > > > >
                          > > > > > > > > > On Feb 3, 2008 11:06 AM, Ray
                          > Livingston
                          > > > > > > > <jagboy1964@> wrote:
                          > > > > > > > > >
                          > > > > > > > > > > I finally had a chance today to
                          > > > play
                          > > > > > with
                          > > > > > > > the ballscrews I
                          > > > > > > > > bought
                          > > > > > > > > > > for the CNC conversion on my knee
                          > > > mill. I
                          > > > > > > > bought the Nook XPR
                          > > > > > > > > screw
                          > > > > > > > > > > stock, which is rolled, but higher
                          > > > > > precision
                          > > > > > > > than other rolled
                          > > > > > > > > stock,
                          > > > > > > > > > > with only 0.001"/foot maximum lead
                          > > > error,
                          > > > > > as
                          > > > > > > > opposed to the
                          > > > > > > > > > > 0.004"/foot for the more
                          > pedestrian
                          > > > > > screws,
                          > > > > > > > and 0.0005"/foot
                          > > > > > > > for
                          > > > > > > > > the
                          > > > > > > > > > > *very* expensive ground screws.
                          > The
                          > > > > > > > appearance is much more
                          > > > > > > > like
                          > > > > > > > > > > ground stock, being smooth and a
                          > raw
                          > > > steel
                          > > > > > > > finish, as opposed
                          > > > > > > > to
                          > > > > > > > > the
                          > > > > > > > > > > more typical black oxide finish on
                          > > > most
                          > > > > > rolled
                          > > > > > > > screws. They are
                          > > > > > > > > > > considerably smoother than
                          > standard
                          > > > rolled
                          > > > > > > > stock as well, even
                          > > > > > > > > dry.
                          > > > > > > > > > > This is really beautiful stuff,
                          > and
                          > > > very
                          > > > > > well
                          > > > > > > > worth the small
                          > > > > > > > > > > additional cost.
                          > > > > > > > > > > Since I'm fabricating my own
                          > > > double-nut
                          > > > > > > > assemblies, I've been
                          > > > > > > > > > > agonizing for months over exactly
                          > how
                          > > > to
                          > > > > > > > provide the necessary
                          > > > > > > > > pre-
                          > > > > > > > > > > load. This is typically done with
                          > a
                          > > > > > > > Belleville spring between
                          > > > > > > > the
                          > > > > > > > > > > two nuts, providing on the order
                          > of
                          > > > > > 150-300
                          > > > > > > > pounds of opposing
                          > > > > > > > > force
                          > > > > > > > > > > between the nuts. However, after
                          > > > playing
                          > > > > > with
                          > > > > > > > the actual nuts
                          > > > > > > > and
                          > > > > > > > > > > screws, I am going to eliminate
                          > the
                          > > > > > spring,
                          > > > > > > > and simply rigidly
                          > > > > > > > > mount
                          > > > > > > > > > > both nuts, rotating one of them
                          > > > against
                          > > > > > the
                          > > > > > > > screw to provide
                          > > > > > > > the
                          > > > > > > > > pre-
                          > > > > > > > > > > load. The screws are accurate
                          > enough
                          > > > that
                          > > > > > the
                          > > > > > > > motion is still
                          > > > > > > > > very
                          > > > > > > > > > > smooth and consistent over the
                          > full
                          > > > length
                          > > > > > of
                          > > > > > > > the screw, with
                          > > > > > > > > > > absolutely *zero* backlash. I
                          > tested
                          > > > this
                          > > > > > by
                          > > > > > > > putting both nuts
                          > > > > > > > > on a
                          > > > > > > > > > > screw, tightening them against
                          > each
                          > > > other
                          > > > > > as
                          > > > > > > > tight as I could by
                          > > > > > > > > > > hand, clamping the nuts in my
                          > vise,
                          > > > then
                          > > > > > using
                          > > > > > > > a dial indicator
                          > > > > > > > to
                          > > > > > > > > > > attempt to measure the backlash in
                          > the
                          > > > > > screw.
                          > > > > > > > There was none,
                          > > > > > > > > nada,
                          > > > > > > > > > > zero, zip, zilch! There may be
                          > some
                          > > > very
                          > > > > > > > small penalty in
                          > > > > > > > terms
                          > > > > > > > > of
                          > > > > > > > > > > service life, but for a hobby
                          > machine,
                          > > > > > it'll
                          > > > > > > > never see enough
                          > > > > > > > > service
                          > > > > > > > > > > to come within even 50% of the
                          > > > theoretical
                          > > > > > > > service life
                          > > > > > > > anyway. I
                          > > > > > > > > > > suspect contamination and
                          > corrosion
                          > > > will
                          > > > > > be
                          > > > > > > > far greater risks.
                          > > > > > > > > And
                          > > > > > > > > > > even if they do eventually fail,
                          > many
                          > > > > > years
                          > > > > > > > from now, new ones
                          > > > > > > > are
                          > > > > > > > > > > not all that expensive (I paid
                          > $650
                          > > > for
                          > > > > > all
                          > > > > > > > three screws - two
                          > > > > > > > 1"
                          > > > > > > > > and
                          > > > > > > > > > > one 5/8" - and all six nuts).
                          > Worst
                          > > > case
                          > > > > > > > maybe I have to
                          > > > > > > > replace
                          > > > > > > > > > > them in 15 years. Who cares?
                          > This
                          > > > > > approach
                          > > > > > > > makes the
                          > > > > > > > > fabrication of
                          > > > > > > > > > > the double nut assemblies
                          > absolutely
                          > > > > > trivial.
                          > > > > > > > > > > Nook did send me the wrong
                          > screw
                          > > > for
                          > > > > > the Z
                          > > > > > > > axis (0.250" lead
                          > > > > > > > > > > instead of the 0.200" lead I
                          > ordered),
                          > > > but
                          > > > > > I'm
                          > > > > > > > sure they will
                          > > > > > > > > > > straighten that out quickly.
                          > They've
                          > > > been
                          > > > > > > > very responsive so
                          > > > > > > > far.
                          > > > > > > > > > > This whole conversion is going
                          > to
                          > > > be
                          > > > > > FAR
                          > > > > > > > easier, and FAR
                          > > > > > > > > better,
                          > > > > > > > > > > than the one I did on my
                          > mini-mill!
                          > > > > > > > > > >
                          > > > > > > > > > > Regards,
                          > > > > > > > > > > Ray L.
                          > > > > > > > > > >
                          > > > > > > > > > >
                          > > > > > > > > > >
                          > > > > > > > > > >
                          > > > > > > > > > > Yahoo! Groups Links
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                          >
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                        • Ray Livingston
                          Barry, This is no problem at all. One e-mail, and they re sending the right part, no questions asked. It ll be weeks, maybe months, before I m in a position
                          Message 12 of 15 , Feb 5, 2008
                          • 0 Attachment
                            Barry,

                            This is no problem at all. One e-mail, and they're sending the
                            right part, no questions asked. It'll be weeks, maybe months, before
                            I'm in a position to do anything with that screw, so no harm done. X
                            & Y, I'm hoping to get done in the fairly near future, since there's
                            much less I need to fabricate there.

                            Regards,
                            Ray L.



                            --- In GrizHFMinimill@yahoogroups.com, Barry Young <barryjyoung@...>
                            wrote:
                            >
                            >
                            >
                            > Hi Ray:
                            >
                            > OK, now I understand what you meant to say. I think
                            > this is the post you are referring to:
                            > ********
                            > OK, this is truly bizarre.... I ordered three screws,
                            > two were 1"
                            > OD, 0.250" lead the third was 5/8" OD, 0.200" lead.
                            > When I unpacked
                            > them all, I found the 5/8" screw I received was
                            > actually 0.250"
                            > lead. So, I e-mailed Nook, and informed them they had
                            > sent me the
                            > wrong part. The response was "Nook doesn't manufacture
                            > a 5/8" screw
                            > with 0.250" lead! WTF?? So how did they manage to ship
                            > me something
                            > they don't even manufacture???
                            > *********
                            >
                            > I did not see in there where a nut had a different
                            > pitch than a screw, hence my confusion. Sorry I was
                            > unable to read what you meant.
                            >
                            > It is too bad that you are having this problem which
                            > you should not be having at all. I feel your pain.
                            > Keep your eye on the prize, it is worth all of this in
                            > the end. You are going to have a very nice CNC mill
                            > when you are done with these inevitable bumps in the
                            > road. This will really help out a lot when you are
                            > working on those E type Jags.
                            >
                            > Barry
                            >
                            >
                            >
                            >
                            > --- Ray Livingston <jagboy1964@...> wrote:
                            >
                            > > Barry,
                            > >
                            > > No, they didn't come with the nuts mounted. I
                            > > bought raw screw
                            > > stock by the inch, and pairs of unmounted single
                            > > nuts. Machining of
                            > > the ends, and fabrication of the double nut
                            > > assemblies is my
                            > > problem. So, like I said, they sent me a 4-pitch
                            > > screw, and a 5-
                            > > pitch nut, and that's just not a very workable
                            > > combination. I
                            > > dunno.... Maybe I could make them work, but I'd need
                            > > MUCH more
                            > > powerful motors.... :-)
                            > >
                            > > Regards,
                            > > Ray L.
                            > >
                            > >
                            > >
                            > >
                            > > --- In GrizHFMinimill@yahoogroups.com, Barry Young
                            > > <barryjyoung@>
                            > > wrote:
                            > > >
                            > > >
                            > > >
                            > > > But they came with nuts mounted didn't they? I am
                            > > not
                            > > > stupid. Just trying to decode what you wrote. What
                            > > is
                            > > > the exact problem Ray?
                            > > >
                            > > > Barry
                            > > >
                            > > >
                            > > > --- Ray Livingston <jagboy1964@> wrote:
                            > > >
                            > > > > Barry,
                            > > > >
                            > > > > 'Cause ya can't screw a 5-pitch nut onto a
                            > > > > 4-pitch screw....
                            > > > >
                            > > > > Regards,
                            > > > > Ray L.
                            > > > >
                            > > > >
                            > > > >
                            > > > > --- In GrizHFMinimill@yahoogroups.com, Barry
                            > > Young
                            > > > > <barryjyoung@>
                            > > > > wrote:
                            > > > > >
                            > > > > >
                            > > > > >
                            > > > > > OK, so why all the fuss about the pitch being
                            > > > > other
                            > > > > > than ordered? Tis is confusing.
                            > > > > >
                            > > > > > Thanks
                            > > > > >
                            > > > > > Barry Young
                            > > > > >
                            > > > > >
                            > > > > > --- Ray Livingston <jagboy1964@> wrote:
                            > > > > >
                            > > > > > > Barry,
                            > > > > > >
                            > > > > > > No can do. The original X/Y screws are
                            > > > > 0.200"
                            > > > > > > lead. I can't
                            > > > > > > get 0.200" lead 1" ballscrews for a
                            > > reasonable
                            > > > > > > price, so I'm going
                            > > > > > > with 0.250" lead. Besides, ballscrews and
                            > > > > manual
                            > > > > > > operation really
                            > > > > > > are not a good combination. The cutting
                            > > forces
                            > > > > will
                            > > > > > > back-drive the
                            > > > > > > screws if the axes are not locked. MDI and
                            > > a
                            > > > > good
                            > > > > > > MPG will take the
                            > > > > > > place of manual operation.
                            > > > > > >
                            > > > > > > Regards,
                            > > > > > > Ray L.
                            > > > > > >
                            > > > > > >
                            > > > > > >
                            > > > > > > --- In GrizHFMinimill@yahoogroups.com, Barry
                            > > > > Young
                            > > > > > > <barryjyoung@>
                            > > > > > > wrote:
                            > > > > > > >
                            > > > > > > >
                            > > > > > > >
                            > > > > > > > Hi Ray:
                            > > > > > > >
                            > > > > > > > I would assume you are planning on keeping
                            > > the
                            > > > > > > > original pitches so that the handwheel
                            > > > > > > calibrations
                            > > > > > > > still work. Is that right?
                            > > > > > > >
                            > > > > > > > Barry
                            > > > > > > >
                            > > > > > > >
                            > > > > > > > --- Ray Livingston <jagboy1964@> wrote:
                            > > > > > > >
                            > > > > > > > > OK, this is truly bizarre.... I ordered
                            > > > > three
                            > > > > > > > > screws, two were 1"
                            > > > > > > > > OD, 0.250" lead the third was 5/8" OD,
                            > > > > 0.200"
                            > > > > > > lead.
                            > > > > > > > > When I unpacked
                            > > > > > > > > them all, I found the 5/8" screw I
                            > > received
                            > > > > was
                            > > > > > > > > actually 0.250"
                            > > > > > > > > lead. So, I e-mailed Nook, and informed
                            > > > > them
                            > > > > > > they
                            > > > > > > > > had sent me the
                            > > > > > > > > wrong part. The response was "Nook
                            > > doesn't
                            > > > > > > > > manufacture a 5/8" screw
                            > > > > > > > > with 0.250" lead! WTF?? So how did
                            > > they
                            > > > > manage
                            > > > > > > to
                            > > > > > > > > ship me something
                            > > > > > > > > they don't even manufacture???
                            > > > > > > > >
                            > > > > > > > > Regards,
                            > > > > > > > > Ray L.
                            > > > > > > > >
                            > > > > > > > >
                            > > > > > > > > --- In GrizHFMinimill@yahoogroups.com,
                            > > "Ray
                            > > > > > > > > Livingston"
                            > > > > > > > > <jagboy1964@> wrote:
                            > > > > > > > > >
                            > > > > > > > > > Mike,
                            > > > > > > > > >
                            > > > > > > > > > I ordered directly from Nook. I
                            > > > > couldn't
                            > > > > > > find
                            > > > > > > > > any other source
                            > > > > > > > > > that stocked everything I wanted, and
                            > > > > their
                            > > > > > > prices
                            > > > > > > > > were
                            > > > > > > > > competitive.
                            > > > > > > > > > Just go to their website and submit a
                            > > > > quote.
                            > > > > > > > > You'll then be in
                            > > > > > > > > touch
                            > > > > > > > > > with Catherine Kastelic, their
                            > > Internet
                            > > > > sales
                            > > > > > > > > person, who is a
                            > > > > > > > > > pleasure to work with.
                            > > > > > > > > > Keep in mind, these are not "made"
                            > > for
                            > > > > my
                            > > > > > > > > machine. I just
                            > > > > > > > > bought
                            > > > > > > > > > lengths of screw stock, and loose
                            > > nuts,
                            > > > > and
                            > > > > > > will
                            > > > > > > > > do the screw
                            > > > > > > > > > machining and double-nut fabrication
                            > > > > myself,
                            > > > > > > but
                            > > > > > > > > neither is
                            > > > > > > > > > particularly challenging if you've got
                            > > > > > > appropriate
                            > > > > > > > > equipment.
                            > > > > > > > > >
                            > > > > > > > > > Regards,
                            > > > > > > > > > Ray L.
                            > > > > > > > > >
                            > > > > > > > > >
                            > > > > > > > > > --- In GrizHFMinimill@yahoogroups.com,
                            > > > > "Mike
                            > > > > > > > > Payson" <mike@> wrote:
                            > > > > > > > > > >
                            > > > > > > > > > > Hi Ray,
                            > > > > > > > > > >
                            > > > > > > > > > > I'm not sure if you mentioned this
                            > > in a
                            > > > > > > previous
                            > > > > > > > > post, but can
                            > > > > > > > > you
                            > > > > > > > > > tell me
                            > > > > > > > > > > where you bought these from? We have
                            > > a
                            > > > > Jet
                            > > > > > > mill
                            > > > > > > > > (Bridgeport
                            > > > > > > > > clone)
                            > > > > > > > > > at work,
                            > > > > > > > > > > and we've talked about eventually
                            > > doing
                            > > > > a
                            > > > > > > CNC
                            > > > > > > > > conversion on it.
                            > > > > > > > > > Sounds like
                            > > > > > > > > > > these are the way to go.
                            > > > > > > > > > >
                            > > > > > > > > > > Thanks!
                            > > > > > > > > > >
                            > > > > > > > > > > On Feb 3, 2008 11:06 AM, Ray
                            > > Livingston
                            > > > > > > > > <jagboy1964@> wrote:
                            > > > > > > > > > >
                            > > > > > > > > > > > I finally had a chance today to
                            > > > > play
                            > > > > > > with
                            > > > > > > > > the ballscrews I
                            > > > > > > > > > bought
                            > > > > > > > > > > > for the CNC conversion on my knee
                            > > > > mill. I
                            > > > > > > > > bought the Nook XPR
                            > > > > > > > > > screw
                            > > > > > > > > > > > stock, which is rolled, but higher
                            > > > > > > precision
                            > > > > > > > > than other rolled
                            > > > > > > > > > stock,
                            > > > > > > > > > > > with only 0.001"/foot maximum lead
                            > > > > error,
                            > > > > > > as
                            > > > > > > > > opposed to the
                            > > > > > > > > > > > 0.004"/foot for the more
                            > > pedestrian
                            > > > > > > screws,
                            > > > > > > > > and 0.0005"/foot
                            > > > > > > > > for
                            > > > > > > > > > the
                            > > > > > > > > > > > *very* expensive ground screws.
                            > > The
                            > > > > > > > > appearance is much more
                            > > > > > > > > like
                            > > > > > > > > > > > ground stock, being smooth and a
                            > > raw
                            > > > > steel
                            > > > > > > > > finish, as opposed
                            > > > > > > > > to
                            > > > > > > > > > the
                            > > > > > > > > > > > more typical black oxide finish on
                            > > > > most
                            > > > > > > rolled
                            > > > > > > > > screws. They are
                            > > > > > > > > > > > considerably smoother than
                            > > standard
                            > > > > rolled
                            > > > > > > > > stock as well, even
                            > > > > > > > > > dry.
                            > > > > > > > > > > > This is really beautiful stuff,
                            > > and
                            > > > > very
                            > > > > > > well
                            > > > > > > > > worth the small
                            > > > > > > > > > > > additional cost.
                            > > > > > > > > > > > Since I'm fabricating my own
                            > > > > double-nut
                            > > > > > > > > assemblies, I've been
                            > > > > > > > > > > > agonizing for months over exactly
                            > > how
                            > > > > to
                            > > > > > > > > provide the necessary
                            > > > > > > > > > pre-
                            > > > > > > > > > > > load. This is typically done with
                            > > a
                            > > > > > > > > Belleville spring between
                            > > > > > > > > the
                            > > > > > > > > > > > two nuts, providing on the order
                            > > of
                            > > > > > > 150-300
                            > > > > > > > > pounds of opposing
                            > > > > > > > > > force
                            > > > > > > > > > > > between the nuts. However, after
                            > > > > playing
                            > > > > > > with
                            > > > > > > > > the actual nuts
                            > > > > > > > > and
                            > > > > > > > > > > > screws, I am going to eliminate
                            > > the
                            > > > > > > spring,
                            > > > > > > > > and simply rigidly
                            > > > > > > > > > mount
                            > > > > > > > > > > > both nuts, rotating one of them
                            > > > > against
                            > > > > > > the
                            > > > > > > > > screw to provide
                            > > > > > > > > the
                            > > > > > > > > > pre-
                            > > > > > > > > > > > load. The screws are accurate
                            > > enough
                            > > > > that
                            > > > > > > the
                            > > > > > > > > motion is still
                            > > > > > > > > > very
                            > > > > > > > > > > > smooth and consistent over the
                            > > full
                            > > > > length
                            > > > > > > of
                            > > > > > > > > the screw, with
                            > > > > > > > > > > > absolutely *zero* backlash. I
                            > > tested
                            > > > > this
                            > > > > > > by
                            > > > > > > > > putting both nuts
                            > > > > > > > > > on a
                            > > > > > > > > > > > screw, tightening them against
                            > > each
                            > > > > other
                            > > > > > > as
                            > > > > > > > > tight as I could by
                            > > > > > > > > > > > hand, clamping the nuts in my
                            > > vise,
                            > > > > then
                            > > > > > > using
                            > > > > > > > > a dial indicator
                            > > > > > > > > to
                            > > > > > > > > > > > attempt to measure the backlash in
                            > > the
                            > > > > > > screw.
                            > > > > > > > > There was none,
                            > > > > > > > > > nada,
                            > > > > > > > > > > > zero, zip, zilch! There may be
                            > > some
                            > > > > very
                            > > > > > > > > small penalty in
                            > > > > > > > > terms
                            > > > > > > > > > of
                            > > > > > > > > > > > service life, but for a hobby
                            > > machine,
                            > > > > > > it'll
                            > > > > > > > > never see enough
                            > > > > > > > > > service
                            > > > > > > > > > > > to come within even 50% of the
                            > > > > theoretical
                            > > > > > > > > service life
                            > > > > > > > > anyway. I
                            > > > > > > > > > > > suspect contamination and
                            > > corrosion
                            > > > > will
                            > > > > > > be
                            > > > > > > > > far greater risks.
                            > > > > > > > > > And
                            > > > > > > > > > > > even if they do eventually fail,
                            > > many
                            > > > > > > years
                            > > > > > > > > from now, new ones
                            > > > > > > > > are
                            > > > > > > > > > > > not all that expensive (I paid
                            > > $650
                            > > > > for
                            > > > > > > all
                            > > > > > > > > three screws - two
                            > > > > > > > > 1"
                            > > > > > > > > > and
                            > > > > > > > > > > > one 5/8" - and all six nuts).
                            > > Worst
                            > > > > case
                            > > > > > > > > maybe I have to
                            > > > > > > > > replace
                            > > > > > > > > > > > them in 15 years. Who cares?
                            > > This
                            > > > > > > approach
                            > > > > > > > > makes the
                            > > > > > > > > > fabrication of
                            > > > > > > > > > > > the double nut assemblies
                            > > absolutely
                            > > > > > > trivial.
                            > > > > > > > > > > > Nook did send me the wrong
                            > > screw
                            > > > > for
                            > > > > > > the Z
                            > > > > > > > > axis (0.250" lead
                            > > > > > > > > > > > instead of the 0.200" lead I
                            > > ordered),
                            > > > > but
                            > > > > > > I'm
                            > > > > > > > > sure they will
                            > > > > > > > > > > > straighten that out quickly.
                            > > They've
                            > > > > been
                            > > > > > > > > very responsive so
                            > > > > > > > > far.
                            > > > > > > > > > > > This whole conversion is going
                            > > to
                            > > > > be
                            > > > > > > FAR
                            > > > > > > > > easier, and FAR
                            > > > > > > > > > better,
                            > > > > > > > > > > > than the one I did on my
                            > > mini-mill!
                            > > > > > > > > > > >
                            > > > > > > > > > > > Regards,
                            > > > > > > > > > > > Ray L.
                            > > > > > > > > > > >
                            > > > > > > > > > > >
                            > > > > > > > > > > >
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                            >
                          • Barry Young
                            Good deal Ray. I am happy you will not be inconvenienced. Barry ... http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ ...
                            Message 13 of 15 , Feb 5, 2008
                            • 0 Attachment
                              Good deal Ray. I am happy you will not be
                              inconvenienced.

                              Barry


                              --- Ray Livingston <jagboy1964@...> wrote:

                              > Barry,
                              >
                              > This is no problem at all. One e-mail, and
                              > they're sending the
                              > right part, no questions asked. It'll be weeks,
                              > maybe months, before
                              > I'm in a position to do anything with that screw, so
                              > no harm done. X
                              > & Y, I'm hoping to get done in the fairly near
                              > future, since there's
                              > much less I need to fabricate there.
                              >
                              > Regards,
                              > Ray L.
                              >
                              >
                              >
                              > --- In GrizHFMinimill@yahoogroups.com, Barry Young
                              > <barryjyoung@...>
                              > wrote:
                              > >
                              > >
                              > >
                              > > Hi Ray:
                              > >
                              > > OK, now I understand what you meant to say. I
                              > think
                              > > this is the post you are referring to:
                              > > ********
                              > > OK, this is truly bizarre.... I ordered three
                              > screws,
                              > > two were 1"
                              > > OD, 0.250" lead the third was 5/8" OD, 0.200"
                              > lead.
                              > > When I unpacked
                              > > them all, I found the 5/8" screw I received was
                              > > actually 0.250"
                              > > lead. So, I e-mailed Nook, and informed them they
                              > had
                              > > sent me the
                              > > wrong part. The response was "Nook doesn't
                              > manufacture
                              > > a 5/8" screw
                              > > with 0.250" lead! WTF?? So how did they manage to
                              > ship
                              > > me something
                              > > they don't even manufacture???
                              > > *********
                              > >
                              > > I did not see in there where a nut had a different
                              > > pitch than a screw, hence my confusion. Sorry I
                              > was
                              > > unable to read what you meant.
                              > >
                              > > It is too bad that you are having this problem
                              > which
                              > > you should not be having at all. I feel your pain.
                              > > Keep your eye on the prize, it is worth all of
                              > this in
                              > > the end. You are going to have a very nice CNC
                              > mill
                              > > when you are done with these inevitable bumps in
                              > the
                              > > road. This will really help out a lot when you are
                              > > working on those E type Jags.
                              > >
                              > > Barry
                              > >
                              > >
                              > >
                              > >
                              > > --- Ray Livingston <jagboy1964@...> wrote:
                              > >
                              > > > Barry,
                              > > >
                              > > > No, they didn't come with the nuts mounted.
                              > I
                              > > > bought raw screw
                              > > > stock by the inch, and pairs of unmounted single
                              > > > nuts. Machining of
                              > > > the ends, and fabrication of the double nut
                              > > > assemblies is my
                              > > > problem. So, like I said, they sent me a
                              > 4-pitch
                              > > > screw, and a 5-
                              > > > pitch nut, and that's just not a very workable
                              > > > combination. I
                              > > > dunno.... Maybe I could make them work, but I'd
                              > need
                              > > > MUCH more
                              > > > powerful motors.... :-)
                              > > >
                              > > > Regards,
                              > > > Ray L.
                              > > >
                              > > >
                              > > >
                              > > >
                              > > > --- In GrizHFMinimill@yahoogroups.com, Barry
                              > Young
                              > > > <barryjyoung@>
                              > > > wrote:
                              > > > >
                              > > > >
                              > > > >
                              > > > > But they came with nuts mounted didn't they? I
                              > am
                              > > > not
                              > > > > stupid. Just trying to decode what you wrote.
                              > What
                              > > > is
                              > > > > the exact problem Ray?
                              > > > >
                              > > > > Barry
                              > > > >
                              > > > >
                              > > > > --- Ray Livingston <jagboy1964@> wrote:
                              > > > >
                              > > > > > Barry,
                              > > > > >
                              > > > > > 'Cause ya can't screw a 5-pitch nut onto
                              > a
                              > > > > > 4-pitch screw....
                              > > > > >
                              > > > > > Regards,
                              > > > > > Ray L.
                              > > > > >
                              > > > > >
                              > > > > >
                              > > > > > --- In GrizHFMinimill@yahoogroups.com, Barry
                              > > > Young
                              > > > > > <barryjyoung@>
                              > > > > > wrote:
                              > > > > > >
                              > > > > > >
                              > > > > > >
                              > > > > > > OK, so why all the fuss about the pitch
                              > being
                              > > > > > other
                              > > > > > > than ordered? Tis is confusing.
                              > > > > > >
                              > > > > > > Thanks
                              > > > > > >
                              > > > > > > Barry Young
                              > > > > > >
                              > > > > > >
                              > > > > > > --- Ray Livingston <jagboy1964@> wrote:
                              > > > > > >
                              > > > > > > > Barry,
                              > > > > > > >
                              > > > > > > > No can do. The original X/Y screws
                              > are
                              > > > > > 0.200"
                              > > > > > > > lead. I can't
                              > > > > > > > get 0.200" lead 1" ballscrews for a
                              > > > reasonable
                              > > > > > > > price, so I'm going
                              > > > > > > > with 0.250" lead. Besides, ballscrews
                              > and
                              > > > > > manual
                              > > > > > > > operation really
                              > > > > > > > are not a good combination. The cutting
                              > > > forces
                              > > > > > will
                              > > > > > > > back-drive the
                              > > > > > > > screws if the axes are not locked. MDI
                              > and
                              > > > a
                              > > > > > good
                              > > > > > > > MPG will take the
                              > > > > > > > place of manual operation.
                              > > > > > > >
                              > > > > > > > Regards,
                              > > > > > > > Ray L.
                              > > > > > > >
                              > > > > > > >
                              > > > > > > >
                              > > > > > > > --- In GrizHFMinimill@yahoogroups.com,
                              > Barry
                              > > > > > Young
                              > > > > > > > <barryjyoung@>
                              > > > > > > > wrote:
                              > > > > > > > >
                              > > > > > > > >
                              > > > > > > > >
                              > > > > > > > > Hi Ray:
                              > > > > > > > >
                              > > > > > > > > I would assume you are planning on
                              > keeping
                              > > > the
                              > > > > > > > > original pitches so that the handwheel
                              > > > > > > > calibrations
                              > > > > > > > > still work. Is that right?
                              > > > > > > > >
                              > > > > > > > > Barry
                              > > > > > > > >
                              > > > > > > > >
                              > > > > > > > > --- Ray Livingston <jagboy1964@>
                              > wrote:
                              > > > > > > > >
                              > > > > > > > > > OK, this is truly bizarre.... I
                              > ordered
                              > > > > > three
                              > > > > > > > > > screws, two were 1"
                              > > > > > > > > > OD, 0.250" lead the third was 5/8"
                              > OD,
                              > > > > > 0.200"
                              > > > > > > > lead.
                              > > > > > > > > > When I unpacked
                              > > > > > > > > > them all, I found the 5/8" screw I
                              > > > received
                              > > > > > was
                              > > > > > > > > > actually 0.250"
                              > > > > > > > > > lead. So, I e-mailed Nook, and
                              > informed
                              > > > > > them
                              > > > > > > > they
                              > > > > > > > > > had sent me the
                              > > > > > > > > > wrong part. The response was "Nook
                              > > > doesn't
                              > > > > > > > > > manufacture a 5/8" screw
                              > > > > > > > > > with 0.250" lead! WTF?? So how did
                              > > > they
                              > > > > > manage
                              > > > > > > > to
                              > > > > > > > > > ship me something
                              > > > > > > > > > they don't even manufacture???
                              > > > > > > > > >
                              > > > > > > > > > Regards,
                              > > > > > > > > > Ray L.
                              > > > > > > > > >
                              > > > > > > > > >
                              > > > > > > > > > --- In
                              > GrizHFMinimill@yahoogroups.com,
                              > > > "Ray
                              > > > > > > > > > Livingston"
                              > > > > > > > > > <jagboy1964@> wrote:
                              > > > > > > > > > >
                              > > > > > > > > > > Mike,
                              > > > > > > > > > >
                              > > > > > > > > > > I ordered directly from Nook.
                              > I
                              > > > > > couldn't
                              > > > > > > > find
                              > > > > > > > > > any other source
                              > > > > > > > > > > that stocked everything I wanted,
                              > and
                              > > > > > their
                              > > > > > > > prices
                              > > > > > > > > > were
                              > > > > > > > > > competitive.
                              > > > > > > > > > > Just go to their website and
                              > submit a
                              > > > > > quote.
                              > > > > > > > > > You'll then be in
                              > > > > > > > > > touch
                              > > > > > > > > > > with Catherine Kastelic, their
                              > > > Internet
                              > > > > > sales
                              > > > > > > > > > person, who is a
                              > > > > > > > > > > pleasure to work with.
                              > > > > > > > > > > Keep in mind, these are not
                              > "made"
                              > > > for
                              > > > > > my
                              > > > > > > > > > machine. I just
                              > > > > > > > > > bought
                              > > > > > > > > > > lengths of screw stock, and loose
                              > > > nuts,
                              > > > > > and
                              > > > > > > > will
                              > > > > > > > > > do the screw
                              > > > > > > > > > > machining and double-nut
                              > fabrication
                              > > > > > myself,
                              > > > > > > > but
                              > > > > > > > > > neither is
                              > > > > > > > > > > particularly challenging if you've
                              > got
                              > > > > > > > appropriate
                              > > > > > > > > > equipment.
                              > > > > > > > > > >
                              > > > > > > > > > > Regards,
                              > > > > > > > > > > Ray L.
                              > > > > > > > > > >
                              > > > > > > > > > >
                              > > > > > > > > > > --- In
                              > GrizHFMinimill@yahoogroups.com,
                              > > > > > "Mike
                              > > > > > > > > > Payson" <mike@> wrote:
                              > > > > > > > > > > >
                              > > > > > > > > > > > Hi Ray,
                              > > > > > > > > > > >
                              > > > > > > > > > > > I'm not sure if you mentioned
                              > this
                              > > > in a
                              > > > > > > > previous
                              > > > > > > > > > post, but can
                              > > > > > > > > > you
                              > > > > > > > > > > tell me
                              > > > > > > > > > > > where you bought these from? We
                              > have
                              > > > a
                              > > > > > Jet
                              > > > > > > > mill
                              > > > > > > > > > (Bridgeport
                              > > > > > > > > > clone)
                              > > > > > > > > > > at work,
                              > > > > > > > > > > > and we've talked about
                              > eventually
                              > > > doing
                              > > > > > a
                              > > > > > > > CNC
                              > > > > > > > > > conversion on it.
                              > > > > > > > > > > Sounds like
                              > > > > > > > > > > > these are the way to go.
                              > > > > > > > > > > >
                              > > > > > > > > > > > Thanks!
                              > > > > > > > > > > >
                              > > > > > > > > > > > On Feb 3, 2008 11:06 AM, Ray
                              > > > Livingston
                              > > > > > > > > > <jagboy1964@> wrote:
                              > > > > > > > > > > >
                              > > > > > > > > > > > > I finally had a chance
                              > today to
                              > > > > > play
                              > > > > > > > with
                              > > > > > > > > > the ballscrews I
                              > > > > > > > > > > bought
                              > > > > > > > > > > > > for the CNC conversion on my
                              > knee
                              > > > > > mill. I
                              > > > > > > > > > bought the Nook XPR
                              > > > > > > > > > > screw
                              > > > > > > > > > > > > stock, which is rolled, but
                              > higher
                              > > > > > > > precision
                              > > > > > > > > > than other rolled
                              > > > > > > > > > > stock,
                              > > > > > > > > > > > > with only 0.001"/foot maximum
                              > lead
                              > > > > > error,
                              > > > > > > > as
                              > > > > > > > > > opposed to the
                              > > > > > > > > > > > > 0.004"/foot for the more
                              > > > pedestrian
                              > > > > > > > screws,
                              > > > > > > > > > and 0.0005"/foot
                              > > > > > > > > > for
                              > > > > > > > > > > the
                              > > > > > > > > > > > > *very* expensive ground
                              > screws.
                              > > > The
                              > > > > > > > > > appearance is much more
                              > > > > > > > > > like
                              > > > > > > > > > > > > ground stock, being smooth and
                              > a
                              > > > raw
                              > > > > > steel
                              > > > > > > > > > finish, as opposed
                              > > > > > > > > > to
                              > > > > > > > > > > the
                              > > > > > > > > > > > > more typical black oxide
                              > finish on
                              > > > > > most
                              > > > > > > > rolled
                              > > > > > > > > > screws. They are
                              > > > > > > > > > > > > considerably smoother than
                              > > > standard
                              > > > > > rolled
                              > > > > > > > > > stock as well, even
                              > > > > > > > > > > dry.
                              > > > > > > > > > > > > This is really beautiful
                              > stuff,
                              > > > and
                              > > > > > very
                              > > > > > > > well
                              > > > > > > > > > worth the small
                              > > > > > > > > > > > > additional cost.
                              > > > > > > > > > > > > Since I'm fabricating my
                              > own
                              > > > > > double-nut
                              > > > > > > > > > assemblies, I've been
                              > > > > > > > > > > > > agonizing for months over
                              > exactly
                              > > > how
                              > > > > > to
                              > > > > > > > > > provide the necessary
                              > > > > > > > > > > pre-
                              > > > > > > > > > > > > load. This is typically done
                              > with
                              > > > a
                              > > > > > > > > > Belleville spring between
                              > > > > > > > > > the
                              > > > > > > > > > > > > two nuts, providing on the
                              > order
                              > > > of
                              > > > > > > > 150-300
                              > > > > > > > > > pounds of opposing
                              > > > > > > > > > > force
                              > > > > > > > > > > > > between the nuts. However,
                              > after
                              > > > > > playing
                              > > > > > > > with
                              > > > > > > > > > the actual nuts
                              > > > > > > > > > and
                              > > > > > > > > > > > > screws, I am going to
                              > eliminate
                              > > > the
                              > > > > > > > spring,
                              > > > > > > > > > and simply rigidly
                              > > > > > > > > > > mount
                              > > > > > > > > > > > > both nuts, rotating one of
                              > them
                              > > > > > against
                              > > > > > > > the
                              > > > > > > > > > screw to provide
                              > > > > > > > > > the
                              > > > > > > > > > > pre-
                              > > > > > > > > > > > > load. The screws are accurate
                              > > > enough
                              > > > > > that
                              > > > > > > > the
                              > > > > > > > > > motion is still
                              > > > > > > > > > > very
                              > > > > > > > > > > > > smooth and consistent over the
                              > > > full
                              > > > > > length
                              > > > > > > > of
                              > > > > > > > > > the screw, with
                              > > > > > > > > > > > > absolutely *zero* backlash. I
                              > > > tested
                              > > > > > this
                              > > > > > > > by
                              > > > > > > > > > putting both nuts
                              > > > > > > > > > > on a
                              > > > > > > > > > > > > screw, tightening them against
                              > > > each
                              > > > > > other
                              > > > > > > > as
                              > > > > > > > > > tight as I could by
                              > > > > > > > > > > > > hand, clamping the nuts in my
                              > > > vise,
                              > > > > > then
                              > > > > > > > using
                              > > > > > > > > > a dial indicator
                              > > > > > > > > > to
                              > > > > > > > > > > > > attempt to measure the
                              > backlash in
                              > > > the
                              > > > > > > > screw.
                              > > > > > > > > > There was none,
                              > > > > > > > > > > nada,
                              > > > > > > > > > > > > zero, zip, zilch! There may
                              > be
                              > > > some
                              > > > > > very
                              > > > > > > > > > small penalty in
                              > > > > > > > > > terms
                              > > > > > > > > > > of
                              > > > > > > > > > > > > service life, but for a hobby
                              > > > machine,
                              > > > > > > > it'll
                              > > > > > > > > > never see enough
                              > > > > > > > > > > service
                              > > > > > > > > > > > > to come within even 50% of the
                              > > > > > theoretical
                              > > > > > > > > > service life
                              > > > > > > > > > anyway. I
                              > > > > > > > > > > > > suspect contamination and
                              > > > corrosion
                              > > > > > will
                              > > > > > > > be
                              > > > > > > > > > far greater risks.
                              > > > > > > > > > > And
                              > > > > > > > > > > > > even if they do eventually
                              > fail,
                              > > > many
                              > > > > > > > years
                              > > > > > > > > > from now, new ones
                              > > > > > > > > > are
                              > > > > > > > > > > > > not all that expensive (I paid
                              > > > $650
                              > > > > > for
                              > > > > > > > all
                              > > > > > > > > > three screws - two
                              > > > > > > > > > 1"
                              > > > > > > > > > > and
                              > > > > > > > > > > > > one 5/8" - and all six nuts).
                              > > > Worst
                              > > > > > case
                              > > > > > > > > > maybe I have to
                              > > > > > > > > > replace
                              > > > > > > > > > > > > them in 15 years. Who cares?
                              > > > This
                              > > > > > > > approach
                              > > > > > > > > > makes the
                              > > > > > > > > > > fabrication of
                              > > > > > > > > > > > > the double nut assemblies
                              > > > absolutely
                              > > > > > > > trivial.
                              > > > > > > > > > > > > Nook did send me the wrong
                              > > > screw
                              > > > > > for
                              > > > > > > > the Z
                              > > > > > > > > > axis (0.250" lead
                              > > > > > > > > > > > > instead of the 0.200" lead I
                              > > > ordered),
                              > > > > > but
                              > > > > > > > I'm
                              > > > > > > > > > sure they will
                              > > > > > > > > > > > > straighten that out quickly.
                              > > > They've
                              > > > > > been
                              > > > > > > > > > very responsive so
                              > > > > > > > > > far.
                              > > > > > > > > > > > > This whole conversion is
                              > going
                              > > > to
                              > > > > > be
                              > > > > > > > FAR
                              > > > > > > > > > easier, and FAR
                              > > > > > > > > > > better,
                              > > > > > > > > > > > > than the one I did on my
                              > > > mini-mill!
                              > > > > > > > > > > > >
                              > > > > > > > > > > > > Regards,
                              > > > > > > > > > > > > Ray L.
                              > > > > > > > > > > > >
                              > > > > > > > > > > > >
                              > > > > > > > > > > > >
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                              > > >
                              > >
                              >
                              http://tools.search.yahoo.com/newsearch/category.php?
                              > > > category=shopping
                              > > > > > >
                              > > > > >
                              > > > > >
                              > > > > >
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                              > > > > >
                              > > > > > Yahoo! Groups Links
                              > > > > >
                              > > > > > (Yahoo! ID required)
                              > > > > >
                              > > > > >
                              > > >
                              > mailto:GrizHFMinimill-fullfeatured@yahoogroups.com
                              > > > > >
                              > > > > >
                              > > > > >
                              > > > >
                              > > > >
                              > > > >
                              > > > >
                              > > >
                              > >
                              >
                              ______________________________________________________________________
                              > > > ______________
                              > > > > Looking for last minute shopping deals?
                              > > > > Find them fast with Yahoo! Search.
                              > > >
                              > >
                              >
                              http://tools.search.yahoo.com/newsearch/category.php?
                              > category=shopping
                              > > > >
                              > > >
                              > > >
                              > > >
                              > > >
                              > > >
                              > > > Yahoo! Groups Links
                              > > >
                              > > > (Yahoo! ID required)
                              > > >
                              > > >
                              > mailto:GrizHFMinimill-fullfeatured@yahoogroups.com
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                              > >
                              >
                              ______________________________________________________________________
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                              > > Never miss a thing. Make Yahoo your home page.
                              > > http://www.yahoo.com/r/hs
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                            • Mike Payson
                              Just out of curiosity, did you ever get an explanation on how you got a non-existent part?
                              Message 14 of 15 , Feb 5, 2008
                              • 0 Attachment
                                Just out of curiosity, did you ever get an explanation on how you got a non-existent part?

                                On Feb 5, 2008 7:55 PM, Ray Livingston <jagboy1964@...> wrote:
                                Barry,

                                   This is no problem at all.  One e-mail, and they're sending the
                                right part, no questions asked.  It'll be weeks, maybe months, before
                                I'm in a position to do anything with that screw, so no harm done.  X
                                & Y, I'm hoping to get done in the fairly near future, since there's
                                much less I need to fabricate there.

                                Regards,
                                Ray L.



                                --- In GrizHFMinimill@yahoogroups.com, Barry Young <barryjyoung@...>
                                wrote:
                                >
                                >
                                >
                                > Hi Ray:
                                >
                                > OK, now I understand what you meant to say. I think
                                > this is the post you are referring to:
                                > ********
                                > OK, this is truly bizarre.... I ordered three screws,
                                > two were 1"
                                > OD, 0.250" lead the third was 5/8" OD, 0.200" lead.
                                > When I unpacked
                                > them all, I found the 5/8" screw I received was
                                > actually 0.250"
                                > lead. So, I e-mailed Nook, and informed them they had
                                > sent me the
                                > wrong part. The response was "Nook doesn't manufacture
                                > a 5/8" screw
                                > with 0.250" lead! WTF?? So how did they manage to ship
                                > me something
                                > they don't even manufacture???
                                > *********
                                >
                                > I did not see in there where a nut had a different
                                > pitch than a screw, hence my confusion. Sorry I was
                                > unable to read what you meant.
                                >
                                > It is too bad that you are having this problem which
                                > you should not be having at all. I feel your pain.
                                > Keep your eye on the prize, it is worth all of this in
                                > the end. You are going to have a very nice CNC mill
                                > when you are done with these inevitable bumps in the
                                > road. This will really help out a lot when you are
                                > working on those E type Jags.
                                >
                                > Barry
                                >
                                >
                                >
                                >
                                > --- Ray Livingston <jagboy1964@...> wrote:
                                >
                                > > Barry,
                                > >
                                > >     No, they didn't come with the nuts mounted.  I
                                > > bought raw screw
                                > > stock by the inch, and pairs of unmounted single
                                > > nuts.  Machining of
                                > > the ends, and fabrication of the double nut
                                > > assemblies is my
                                > > problem.  So, like I said, they sent me a 4-pitch
                                > > screw, and a 5-
                                > > pitch nut, and that's just not a very workable
                                > > combination.  I
                                > > dunno.... Maybe I could make them work, but I'd need
                                > > MUCH more
                                > > powerful motors....  :-)
                                > >
                                > > Regards,
                                > > Ray L.
                                > >
                                > >
                                > >
                                > >
                                > > --- In GrizHFMinimill@yahoogroups.com, Barry Young
                                > > <barryjyoung@>
                                > > wrote:
                                > > >
                                > > >
                                > > >
                                > > > But they came with nuts mounted didn't they? I am
                                > > not
                                > > > stupid. Just trying to decode what you wrote. What
                                > > is
                                > > > the exact problem Ray?
                                > > >
                                > > > Barry
                                > > >
                                > > >
                                > > > --- Ray Livingston <jagboy1964@> wrote:
                                > > >
                                > > > > Barry,
                                > > > >
                                > > > >     'Cause ya can't screw a 5-pitch nut onto a
                                > > > > 4-pitch screw....
                                > > > >
                                > > > > Regards,
                                > > > > Ray L.
                                > > > >
                                > > > >
                                > > > >
                                > > > > --- In GrizHFMinimill@yahoogroups.com, Barry
                                > > Young
                                > > > > <barryjyoung@>
                                > > > > wrote:
                                > > > > >
                                > > > > >
                                > > > > >
                                > > > > > OK, so why all the fuss about the pitch being
                                > > > > other
                                > > > > > than ordered? Tis is confusing.
                                > > > > >
                                > > > > > Thanks
                                > > > > >
                                > > > > > Barry Young
                                > > > > >
                                > > > > >
                                > > > > > --- Ray Livingston <jagboy1964@> wrote:
                                > > > > >
                                > > > > > > Barry,
                                > > > > > >
                                > > > > > >      No can do.  The original X/Y screws are
                                > > > > 0.200"
                                > > > > > > lead.  I can't
                                > > > > > > get 0.200" lead 1" ballscrews for a
                                > > reasonable
                                > > > > > > price, so I'm going
                                > > > > > > with 0.250" lead.  Besides, ballscrews and
                                > > > > manual
                                > > > > > > operation really
                                > > > > > > are not a good combination.  The cutting
                                > > forces
                                > > > > will
                                > > > > > > back-drive the
                                > > > > > > screws if the axes are not locked.  MDI and
                                > > a
                                > > > > good
                                > > > > > > MPG will take the
                                > > > > > > place of manual operation.
                                > > > > > >
                                > > > > > > Regards,
                                > > > > > > Ray L.
                                > > > > > >
                                > > > > > >
                                > > > > > >
                                > > > > > > --- In GrizHFMinimill@yahoogroups.com, Barry
                                > > > > Young
                                > > > > > > <barryjyoung@>
                                > > > > > > wrote:
                                > > > > > > >
                                > > > > > > >
                                > > > > > > >
                                > > > > > > > Hi Ray:
                                > > > > > > >
                                > > > > > > > I would assume you are planning on keeping
                                > > the
                                > > > > > > > original pitches so that the handwheel
                                > > > > > > calibrations
                                > > > > > > > still work. Is that right?
                                > > > > > > >
                                > > > > > > > Barry
                                > > > > > > >
                                > > > > > > >
                                > > > > > > > --- Ray Livingston <jagboy1964@> wrote:
                                > > > > > > >
                                > > > > > > > > OK, this is truly bizarre....  I ordered
                                > > > > three
                                > > > > > > > > screws, two were 1"
                                > > > > > > > > OD, 0.250" lead the third was 5/8" OD,
                                > > > > 0.200"
                                > > > > > > lead.
                                > > > > > > > > When I unpacked
                                > > > > > > > > them all, I found the 5/8" screw I
                                > > received
                                > > > > was
                                > > > > > > > > actually 0.250"
                                > > > > > > > > lead.  So, I e-mailed Nook, and informed
                                > > > > them
                                > > > > > > they
                                > > > > > > > > had sent me the
                                > > > > > > > > wrong part.  The response was "Nook
                                > > doesn't
                                > > > > > > > > manufacture a 5/8" screw
                                > > > > > > > > with 0.250" lead!  WTF??  So how did
                                > > they
                                > > > > manage
                                > > > > > > to
                                > > > > > > > > ship me something
                                > > > > > > > > they don't even manufacture???
                                > > > > > > > >
                                > > > > > > > > Regards,
                                > > > > > > > > Ray L.
                                > > > > > > > >
                                > > > > > > > >
                                > > > > > > > > --- In GrizHFMinimill@yahoogroups.com,
                                > > "Ray
                                > > > > > > > > Livingston"
                                > > > > > > > > <jagboy1964@> wrote:
                                > > > > > > > > >
                                > > > > > > > > > Mike,
                                > > > > > > > > >
                                > > > > > > > > >     I ordered directly from Nook.  I
                                > > > > couldn't
                                > > > > > > find
                                > > > > > > > > any other source
                                > > > > > > > > > that stocked everything I wanted, and
                                > > > > their
                                > > > > > > prices
                                > > > > > > > > were
                                > > > > > > > > competitive.
                                > > > > > > > > > Just go to their website and submit a
                                > > > > quote.
                                > > > > > > > > You'll then be in
                                > > > > > > > > touch
                                > > > > > > > > > with Catherine Kastelic, their
                                > > Internet
                                > > > > sales
                                > > > > > > > > person, who is a
                                > > > > > > > > > pleasure to work with.
                                > > > > > > > > >     Keep in mind, these are not "made"
                                > > for
                                > > > > my
                                > > > > > > > > machine.  I just
                                > > > > > > > > bought
                                > > > > > > > > > lengths of screw stock, and loose
                                > > nuts,
                                > > > > and
                                > > > > > > will
                                > > > > > > > > do the screw
                                > > > > > > > > > machining and double-nut fabrication
                                > > > > myself,
                                > > > > > > but
                                > > > > > > > > neither is
                                > > > > > > > > > particularly challenging if you've got
                                > > > > > > appropriate
                                > > > > > > > > equipment.
                                > > > > > > > > >
                                > > > > > > > > > Regards,
                                > > > > > > > > > Ray L.
                                > > > > > > > > >
                                > > > > > > > > >
                                > > > > > > > > > --- In GrizHFMinimill@yahoogroups.com,
                                > > > > "Mike
                                > > > > > > > > Payson" <mike@> wrote:
                                > > > > > > > > > >
                                > > > > > > > > > > Hi Ray,
                                > > > > > > > > > >
                                > > > > > > > > > > I'm not sure if you mentioned this
                                > > in a
                                > > > > > > previous
                                > > > > > > > > post, but can
                                > > > > > > > > you
                                > > > > > > > > > tell me
                                > > > > > > > > > > where you bought these from? We have
                                > > a
                                > > > > Jet
                                > > > > > > mill
                                > > > > > > > > (Bridgeport
                                > > > > > > > > clone)
                                > > > > > > > > > at work,
                                > > > > > > > > > > and we've talked about eventually
                                > > doing
                                > > > > a
                                > > > > > > CNC
                                > > > > > > > > conversion on it.
                                > > > > > > > > > Sounds like
                                > > > > > > > > > > these are the way to go.
                                > > > > > > > > > >
                                > > > > > > > > > > Thanks!
                                > > > > > > > > > >
                                > > > > > > > > > > On Feb 3, 2008 11:06 AM, Ray
                                > > Livingston
                                > > > > > > > > <jagboy1964@> wrote:
                                > > > > > > > > > >
                                > > > > > > > > > > >    I finally had a chance today to
                                > > > > play
                                > > > > > > with
                                > > > > > > > > the ballscrews I
                                > > > > > > > > > bought
                                > > > > > > > > > > > for the CNC conversion on my knee
                                > > > > mill.  I
                                > > > > > > > > bought the Nook XPR
                                > > > > > > > > > screw
                                > > > > > > > > > > > stock, which is rolled, but higher
                                > > > > > > precision
                                > > > > > > > > than other rolled
                                > > > > > > > > > stock,
                                > > > > > > > > > > > with only 0.001"/foot maximum lead
                                > > > > error,
                                > > > > > > as
                                > > > > > > > > opposed to the
                                > > > > > > > > > > > 0.004"/foot for the more
                                > > pedestrian
                                > > > > > > screws,
                                > > > > > > > > and 0.0005"/foot
                                > > > > > > > > for
                                > > > > > > > > > the
                                > > > > > > > > > > > *very* expensive ground screws.
                                > > The
                                > > > > > > > > appearance is much more
                                > > > > > > > > like
                                > > > > > > > > > > > ground stock, being smooth and a
                                > > raw
                                > > > > steel
                                > > > > > > > > finish, as opposed
                                > > > > > > > > to
                                > > > > > > > > > the
                                > > > > > > > > > > > more typical black oxide finish on
                                > > > > most
                                > > > > > > rolled
                                > > > > > > > > screws.  They are
                                > > > > > > > > > > > considerably smoother than
                                > > standard
                                > > > > rolled
                                > > > > > > > > stock as well, even
                                > > > > > > > > > dry.
                                > > > > > > > > > > > This is really beautiful stuff,
                                > > and
                                > > > > very
                                > > > > > > well
                                > > > > > > > > worth the small
                                > > > > > > > > > > > additional cost.
                                > > > > > > > > > > >    Since I'm fabricating my own
                                > > > > double-nut
                                > > > > > > > > assemblies, I've been
                                > > > > > > > > > > > agonizing for months over exactly
                                > > how
                                > > > > to
                                > > > > > > > > provide the necessary
                                > > > > > > > > > pre-
                                > > > > > > > > > > > load.  This is typically done with
                                > > a
                                > > > > > > > > Belleville spring between
                                > > > > > > > > the
                                > > > > > > > > > > > two nuts, providing on the order
                                > > of
                                > > > > > > 150-300
                                > > > > > > > > pounds of opposing
                                > > > > > > > > > force
                                > > > > > > > > > > > between the nuts.  However, after
                                > > > > playing
                                > > > > > > with
                                > > > > > > > > the actual nuts
                                > > > > > > > > and
                                > > > > > > > > > > > screws, I am going to eliminate
                                > > the
                                > > > > > > spring,
                                > > > > > > > > and simply rigidly
                                > > > > > > > > > mount
                                > > > > > > > > > > > both nuts, rotating one of them
                                > > > > against
                                > > > > > > the
                                > > > > > > > > screw to provide
                                > > > > > > > > the
                                > > > > > > > > > pre-
                                > > > > > > > > > > > load.  The screws are accurate
                                > > enough
                                > > > > that
                                > > > > > > the
                                > > > > > > > > motion is still
                                > > > > > > > > > very
                                > > > > > > > > > > > smooth and consistent over the
                                > > full
                                > > > > length
                                > > > > > > of
                                > > > > > > > > the screw, with
                                > > > > > > > > > > > absolutely *zero* backlash.  I
                                > > tested
                                > > > > this
                                > > > > > > by
                                > > > > > > > > putting both nuts
                                > > > > > > > > > on a
                                > > > > > > > > > > > screw, tightening them against
                                > > each
                                > > > > other
                                > > > > > > as
                                > > > > > > > > tight as I could by
                                > > > > > > > > > > > hand, clamping the nuts in my
                                > > vise,
                                > > > > then
                                > > > > > > using
                                > > > > > > > > a dial indicator
                                > > > > > > > > to
                                > > > > > > > > > > > attempt to measure the backlash in
                                > > the
                                > > > > > > screw.
                                > > > > > > > > There was none,
                                > > > > > > > > > nada,
                                > > > > > > > > > > > zero, zip, zilch!  There may be
                                > > some
                                > > > > very
                                > > > > > > > > small penalty in
                                > > > > > > > > terms
                                > > > > > > > > > of
                                > > > > > > > > > > > service life, but for a hobby
                                > > machine,
                                > > > > > > it'll
                                > > > > > > > > never see enough
                                > > > > > > > > > service
                                > > > > > > > > > > > to come within even 50% of the
                                > > > > theoretical
                                > > > > > > > > service life
                                > > > > > > > > anyway.  I
                                > > > > > > > > > > > suspect contamination and
                                > > corrosion
                                > > > > will
                                > > > > > > be
                                > > > > > > > > far greater risks.
                                > > > > > > > > > And
                                > > > > > > > > > > > even if they do eventually fail,
                                > > many
                                > > > > > > years
                                > > > > > > > > from now, new ones
                                > > > > > > > > are
                                > > > > > > > > > > > not all that expensive (I paid
                                > > $650
                                > > > > for
                                > > > > > > all
                                > > > > > > > > three screws - two
                                > > > > > > > > 1"
                                > > > > > > > > > and
                                > > > > > > > > > > > one 5/8" - and all six nuts).
                                > > Worst
                                > > > > case
                                > > > > > > > > maybe I have to
                                > > > > > > > > replace
                                > > > > > > > > > > > them in 15 years.  Who cares?
                                > > This
                                > > > > > > approach
                                > > > > > > > > makes the
                                > > > > > > > > > fabrication of
                                > > > > > > > > > > > the double nut assemblies
                                > > absolutely
                                > > > > > > trivial.
                                > > > > > > > > > > >    Nook did send me the wrong
                                > > screw
                                > > > > for
                                > > > > > > the Z
                                > > > > > > > > axis (0.250" lead
                                > > > > > > > > > > > instead of the 0.200" lead I
                                > > ordered),
                                > > > > but
                                > > > > > > I'm
                                > > > > > > > > sure they will
                                > > > > > > > > > > > straighten that out quickly.
                                > > They've
                                > > > > been
                                > > > > > > > > very responsive so
                                > > > > > > > > far.
                                > > > > > > > > > > >    This whole conversion is going
                                > > to
                                > > > > be
                                > > > > > > FAR
                                > > > > > > > > easier, and FAR
                                > > > > > > > > > better,
                                > > > > > > > > > > > than the one I did on my
                                > > mini-mill!
                                > > > > > > > > > > >
                                > > > > > > > > > > > Regards,
                                > > > > > > > > > > > Ray L.
                                > > > > > > > > > > >
                                > > > > > > > > > > >
                                > > > > > > > > > > >
                                > > > > > > > > > > >
                                > > > > > > > > > > > Yahoo! Groups Links
                                > > > > > > > > > > >
                                > > > > > > > > > > >
                                > > > > > > > > > > >
                                > > > > > > > > > > >
                                > > > > > > > > > >
                                > > > > > > > > >
                                > > > > > > > >
                                > > > > > > > >
                                > > > > > > > >
                                > > > > > > > >
                                > > > > > > > >
                                > > > > > > > > Yahoo! Groups Links
                                > > > > > > > >
                                > > > > > > > >     (Yahoo! ID required)
                                > > > > > > > >
                                > > > > > > > >
                                > > > > > >
                                > > > >
                                > > mailto:GrizHFMinimill-fullfeatured@yahoogroups.com
                                > > > > > > > >
                                > > > > > > > >
                                > > > > > > > >
                                > > > > > > >
                                > > > > > > >
                                > > > > > > >
                                > > > > > > >
                                > > > > > >
                                > > > > >
                                > > > >
                                > > >
                                > >
                                >
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                                >
                                ______________________________________________________________________
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                                > http://tools.search.yahoo.com/newsearch/category.php?
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                              • Ray Livingston
                                Mike, No, I m going to return it to them, so they can try to figure that out. They don t make one like that, and looked in their stock and couldn t find any.
                                Message 15 of 15 , Feb 6, 2008
                                • 0 Attachment
                                  Mike,

                                  No, I'm going to return it to them, so they can try to figure
                                  that out. They don't make one like that, and looked in their stock
                                  and couldn't find any. This should have them scratching their heads
                                  for some time. My guess is they got a return from someone, and
                                  tossed it back into their stock without looking at it carefully
                                  enough.

                                  Regards,
                                  Ray L.


                                  --- In GrizHFMinimill@yahoogroups.com, "Mike Payson" <mike@...> wrote:
                                  >
                                  > Just out of curiosity, did you ever get an explanation on how you
                                  got a
                                  > non-existent part?
                                  >
                                  > On Feb 5, 2008 7:55 PM, Ray Livingston <jagboy1964@...> wrote:
                                  >
                                  > > Barry,
                                  > >
                                  > > This is no problem at all. One e-mail, and they're sending the
                                  > > right part, no questions asked. It'll be weeks, maybe months,
                                  before
                                  > > I'm in a position to do anything with that screw, so no harm
                                  done. X
                                  > > & Y, I'm hoping to get done in the fairly near future, since
                                  there's
                                  > > much less I need to fabricate there.
                                  > >
                                  > > Regards,
                                  > > Ray L.
                                  > >
                                  > >
                                  > >
                                  > > --- In GrizHFMinimill@yahoogroups.com, Barry Young <barryjyoung@>
                                  > > wrote:
                                  > > >
                                  > > >
                                  > > >
                                  > > > Hi Ray:
                                  > > >
                                  > > > OK, now I understand what you meant to say. I think
                                  > > > this is the post you are referring to:
                                  > > > ********
                                  > > > OK, this is truly bizarre.... I ordered three screws,
                                  > > > two were 1"
                                  > > > OD, 0.250" lead the third was 5/8" OD, 0.200" lead.
                                  > > > When I unpacked
                                  > > > them all, I found the 5/8" screw I received was
                                  > > > actually 0.250"
                                  > > > lead. So, I e-mailed Nook, and informed them they had
                                  > > > sent me the
                                  > > > wrong part. The response was "Nook doesn't manufacture
                                  > > > a 5/8" screw
                                  > > > with 0.250" lead! WTF?? So how did they manage to ship
                                  > > > me something
                                  > > > they don't even manufacture???
                                  > > > *********
                                  > > >
                                  > > > I did not see in there where a nut had a different
                                  > > > pitch than a screw, hence my confusion. Sorry I was
                                  > > > unable to read what you meant.
                                  > > >
                                  > > > It is too bad that you are having this problem which
                                  > > > you should not be having at all. I feel your pain.
                                  > > > Keep your eye on the prize, it is worth all of this in
                                  > > > the end. You are going to have a very nice CNC mill
                                  > > > when you are done with these inevitable bumps in the
                                  > > > road. This will really help out a lot when you are
                                  > > > working on those E type Jags.
                                  > > >
                                  > > > Barry
                                  > > >
                                  > > >
                                  > > >
                                  > > >
                                  > > > --- Ray Livingston <jagboy1964@> wrote:
                                  > > >
                                  > > > > Barry,
                                  > > > >
                                  > > > > No, they didn't come with the nuts mounted. I
                                  > > > > bought raw screw
                                  > > > > stock by the inch, and pairs of unmounted single
                                  > > > > nuts. Machining of
                                  > > > > the ends, and fabrication of the double nut
                                  > > > > assemblies is my
                                  > > > > problem. So, like I said, they sent me a 4-pitch
                                  > > > > screw, and a 5-
                                  > > > > pitch nut, and that's just not a very workable
                                  > > > > combination. I
                                  > > > > dunno.... Maybe I could make them work, but I'd need
                                  > > > > MUCH more
                                  > > > > powerful motors.... :-)
                                  > > > >
                                  > > > > Regards,
                                  > > > > Ray L.
                                  > > > >
                                  > > > >
                                  > > > >
                                  > > > >
                                  > > > > --- In GrizHFMinimill@yahoogroups.com, Barry Young
                                  > > > > <barryjyoung@>
                                  > > > > wrote:
                                  > > > > >
                                  > > > > >
                                  > > > > >
                                  > > > > > But they came with nuts mounted didn't they? I am
                                  > > > > not
                                  > > > > > stupid. Just trying to decode what you wrote. What
                                  > > > > is
                                  > > > > > the exact problem Ray?
                                  > > > > >
                                  > > > > > Barry
                                  > > > > >
                                  > > > > >
                                  > > > > > --- Ray Livingston <jagboy1964@> wrote:
                                  > > > > >
                                  > > > > > > Barry,
                                  > > > > > >
                                  > > > > > > 'Cause ya can't screw a 5-pitch nut onto a
                                  > > > > > > 4-pitch screw....
                                  > > > > > >
                                  > > > > > > Regards,
                                  > > > > > > Ray L.
                                  > > > > > >
                                  > > > > > >
                                  > > > > > >
                                  > > > > > > --- In GrizHFMinimill@yahoogroups.com, Barry
                                  > > > > Young
                                  > > > > > > <barryjyoung@>
                                  > > > > > > wrote:
                                  > > > > > > >
                                  > > > > > > >
                                  > > > > > > >
                                  > > > > > > > OK, so why all the fuss about the pitch being
                                  > > > > > > other
                                  > > > > > > > than ordered? Tis is confusing.
                                  > > > > > > >
                                  > > > > > > > Thanks
                                  > > > > > > >
                                  > > > > > > > Barry Young
                                  > > > > > > >
                                  > > > > > > >
                                  > > > > > > > --- Ray Livingston <jagboy1964@> wrote:
                                  > > > > > > >
                                  > > > > > > > > Barry,
                                  > > > > > > > >
                                  > > > > > > > > No can do. The original X/Y screws are
                                  > > > > > > 0.200"
                                  > > > > > > > > lead. I can't
                                  > > > > > > > > get 0.200" lead 1" ballscrews for a
                                  > > > > reasonable
                                  > > > > > > > > price, so I'm going
                                  > > > > > > > > with 0.250" lead. Besides, ballscrews and
                                  > > > > > > manual
                                  > > > > > > > > operation really
                                  > > > > > > > > are not a good combination. The cutting
                                  > > > > forces
                                  > > > > > > will
                                  > > > > > > > > back-drive the
                                  > > > > > > > > screws if the axes are not locked. MDI and
                                  > > > > a
                                  > > > > > > good
                                  > > > > > > > > MPG will take the
                                  > > > > > > > > place of manual operation.
                                  > > > > > > > >
                                  > > > > > > > > Regards,
                                  > > > > > > > > Ray L.
                                  > > > > > > > >
                                  > > > > > > > >
                                  > > > > > > > >
                                  > > > > > > > > --- In GrizHFMinimill@yahoogroups.com, Barry
                                  > > > > > > Young
                                  > > > > > > > > <barryjyoung@>
                                  > > > > > > > > wrote:
                                  > > > > > > > > >
                                  > > > > > > > > >
                                  > > > > > > > > >
                                  > > > > > > > > > Hi Ray:
                                  > > > > > > > > >
                                  > > > > > > > > > I would assume you are planning on keeping
                                  > > > > the
                                  > > > > > > > > > original pitches so that the handwheel
                                  > > > > > > > > calibrations
                                  > > > > > > > > > still work. Is that right?
                                  > > > > > > > > >
                                  > > > > > > > > > Barry
                                  > > > > > > > > >
                                  > > > > > > > > >
                                  > > > > > > > > > --- Ray Livingston <jagboy1964@> wrote:
                                  > > > > > > > > >
                                  > > > > > > > > > > OK, this is truly bizarre.... I ordered
                                  > > > > > > three
                                  > > > > > > > > > > screws, two were 1"
                                  > > > > > > > > > > OD, 0.250" lead the third was 5/8" OD,
                                  > > > > > > 0.200"
                                  > > > > > > > > lead.
                                  > > > > > > > > > > When I unpacked
                                  > > > > > > > > > > them all, I found the 5/8" screw I
                                  > > > > received
                                  > > > > > > was
                                  > > > > > > > > > > actually 0.250"
                                  > > > > > > > > > > lead. So, I e-mailed Nook, and informed
                                  > > > > > > them
                                  > > > > > > > > they
                                  > > > > > > > > > > had sent me the
                                  > > > > > > > > > > wrong part. The response was "Nook
                                  > > > > doesn't
                                  > > > > > > > > > > manufacture a 5/8" screw
                                  > > > > > > > > > > with 0.250" lead! WTF?? So how did
                                  > > > > they
                                  > > > > > > manage
                                  > > > > > > > > to
                                  > > > > > > > > > > ship me something
                                  > > > > > > > > > > they don't even manufacture???
                                  > > > > > > > > > >
                                  > > > > > > > > > > Regards,
                                  > > > > > > > > > > Ray L.
                                  > > > > > > > > > >
                                  > > > > > > > > > >
                                  > > > > > > > > > > --- In GrizHFMinimill@yahoogroups.com,
                                  > > > > "Ray
                                  > > > > > > > > > > Livingston"
                                  > > > > > > > > > > <jagboy1964@> wrote:
                                  > > > > > > > > > > >
                                  > > > > > > > > > > > Mike,
                                  > > > > > > > > > > >
                                  > > > > > > > > > > > I ordered directly from Nook. I
                                  > > > > > > couldn't
                                  > > > > > > > > find
                                  > > > > > > > > > > any other source
                                  > > > > > > > > > > > that stocked everything I wanted, and
                                  > > > > > > their
                                  > > > > > > > > prices
                                  > > > > > > > > > > were
                                  > > > > > > > > > > competitive.
                                  > > > > > > > > > > > Just go to their website and submit a
                                  > > > > > > quote.
                                  > > > > > > > > > > You'll then be in
                                  > > > > > > > > > > touch
                                  > > > > > > > > > > > with Catherine Kastelic, their
                                  > > > > Internet
                                  > > > > > > sales
                                  > > > > > > > > > > person, who is a
                                  > > > > > > > > > > > pleasure to work with.
                                  > > > > > > > > > > > Keep in mind, these are not "made"
                                  > > > > for
                                  > > > > > > my
                                  > > > > > > > > > > machine. I just
                                  > > > > > > > > > > bought
                                  > > > > > > > > > > > lengths of screw stock, and loose
                                  > > > > nuts,
                                  > > > > > > and
                                  > > > > > > > > will
                                  > > > > > > > > > > do the screw
                                  > > > > > > > > > > > machining and double-nut fabrication
                                  > > > > > > myself,
                                  > > > > > > > > but
                                  > > > > > > > > > > neither is
                                  > > > > > > > > > > > particularly challenging if you've got
                                  > > > > > > > > appropriate
                                  > > > > > > > > > > equipment.
                                  > > > > > > > > > > >
                                  > > > > > > > > > > > Regards,
                                  > > > > > > > > > > > Ray L.
                                  > > > > > > > > > > >
                                  > > > > > > > > > > >
                                  > > > > > > > > > > > --- In GrizHFMinimill@yahoogroups.com,
                                  > > > > > > "Mike
                                  > > > > > > > > > > Payson" <mike@> wrote:
                                  > > > > > > > > > > > >
                                  > > > > > > > > > > > > Hi Ray,
                                  > > > > > > > > > > > >
                                  > > > > > > > > > > > > I'm not sure if you mentioned this
                                  > > > > in a
                                  > > > > > > > > previous
                                  > > > > > > > > > > post, but can
                                  > > > > > > > > > > you
                                  > > > > > > > > > > > tell me
                                  > > > > > > > > > > > > where you bought these from? We have
                                  > > > > a
                                  > > > > > > Jet
                                  > > > > > > > > mill
                                  > > > > > > > > > > (Bridgeport
                                  > > > > > > > > > > clone)
                                  > > > > > > > > > > > at work,
                                  > > > > > > > > > > > > and we've talked about eventually
                                  > > > > doing
                                  > > > > > > a
                                  > > > > > > > > CNC
                                  > > > > > > > > > > conversion on it.
                                  > > > > > > > > > > > Sounds like
                                  > > > > > > > > > > > > these are the way to go.
                                  > > > > > > > > > > > >
                                  > > > > > > > > > > > > Thanks!
                                  > > > > > > > > > > > >
                                  > > > > > > > > > > > > On Feb 3, 2008 11:06 AM, Ray
                                  > > > > Livingston
                                  > > > > > > > > > > <jagboy1964@> wrote:
                                  > > > > > > > > > > > >
                                  > > > > > > > > > > > > > I finally had a chance today to
                                  > > > > > > play
                                  > > > > > > > > with
                                  > > > > > > > > > > the ballscrews I
                                  > > > > > > > > > > > bought
                                  > > > > > > > > > > > > > for the CNC conversion on my knee
                                  > > > > > > mill. I
                                  > > > > > > > > > > bought the Nook XPR
                                  > > > > > > > > > > > screw
                                  > > > > > > > > > > > > > stock, which is rolled, but higher
                                  > > > > > > > > precision
                                  > > > > > > > > > > than other rolled
                                  > > > > > > > > > > > stock,
                                  > > > > > > > > > > > > > with only 0.001"/foot maximum lead
                                  > > > > > > error,
                                  > > > > > > > > as
                                  > > > > > > > > > > opposed to the
                                  > > > > > > > > > > > > > 0.004"/foot for the more
                                  > > > > pedestrian
                                  > > > > > > > > screws,
                                  > > > > > > > > > > and 0.0005"/foot
                                  > > > > > > > > > > for
                                  > > > > > > > > > > > the
                                  > > > > > > > > > > > > > *very* expensive ground screws.
                                  > > > > The
                                  > > > > > > > > > > appearance is much more
                                  > > > > > > > > > > like
                                  > > > > > > > > > > > > > ground stock, being smooth and a
                                  > > > > raw
                                  > > > > > > steel
                                  > > > > > > > > > > finish, as opposed
                                  > > > > > > > > > > to
                                  > > > > > > > > > > > the
                                  > > > > > > > > > > > > > more typical black oxide finish on
                                  > > > > > > most
                                  > > > > > > > > rolled
                                  > > > > > > > > > > screws. They are
                                  > > > > > > > > > > > > > considerably smoother than
                                  > > > > standard
                                  > > > > > > rolled
                                  > > > > > > > > > > stock as well, even
                                  > > > > > > > > > > > dry.
                                  > > > > > > > > > > > > > This is really beautiful stuff,
                                  > > > > and
                                  > > > > > > very
                                  > > > > > > > > well
                                  > > > > > > > > > > worth the small
                                  > > > > > > > > > > > > > additional cost.
                                  > > > > > > > > > > > > > Since I'm fabricating my own
                                  > > > > > > double-nut
                                  > > > > > > > > > > assemblies, I've been
                                  > > > > > > > > > > > > > agonizing for months over exactly
                                  > > > > how
                                  > > > > > > to
                                  > > > > > > > > > > provide the necessary
                                  > > > > > > > > > > > pre-
                                  > > > > > > > > > > > > > load. This is typically done with
                                  > > > > a
                                  > > > > > > > > > > Belleville spring between
                                  > > > > > > > > > > the
                                  > > > > > > > > > > > > > two nuts, providing on the order
                                  > > > > of
                                  > > > > > > > > 150-300
                                  > > > > > > > > > > pounds of opposing
                                  > > > > > > > > > > > force
                                  > > > > > > > > > > > > > between the nuts. However, after
                                  > > > > > > playing
                                  > > > > > > > > with
                                  > > > > > > > > > > the actual nuts
                                  > > > > > > > > > > and
                                  > > > > > > > > > > > > > screws, I am going to eliminate
                                  > > > > the
                                  > > > > > > > > spring,
                                  > > > > > > > > > > and simply rigidly
                                  > > > > > > > > > > > mount
                                  > > > > > > > > > > > > > both nuts, rotating one of them
                                  > > > > > > against
                                  > > > > > > > > the
                                  > > > > > > > > > > screw to provide
                                  > > > > > > > > > > the
                                  > > > > > > > > > > > pre-
                                  > > > > > > > > > > > > > load. The screws are accurate
                                  > > > > enough
                                  > > > > > > that
                                  > > > > > > > > the
                                  > > > > > > > > > > motion is still
                                  > > > > > > > > > > > very
                                  > > > > > > > > > > > > > smooth and consistent over the
                                  > > > > full
                                  > > > > > > length
                                  > > > > > > > > of
                                  > > > > > > > > > > the screw, with
                                  > > > > > > > > > > > > > absolutely *zero* backlash. I
                                  > > > > tested
                                  > > > > > > this
                                  > > > > > > > > by
                                  > > > > > > > > > > putting both nuts
                                  > > > > > > > > > > > on a
                                  > > > > > > > > > > > > > screw, tightening them against
                                  > > > > each
                                  > > > > > > other
                                  > > > > > > > > as
                                  > > > > > > > > > > tight as I could by
                                  > > > > > > > > > > > > > hand, clamping the nuts in my
                                  > > > > vise,
                                  > > > > > > then
                                  > > > > > > > > using
                                  > > > > > > > > > > a dial indicator
                                  > > > > > > > > > > to
                                  > > > > > > > > > > > > > attempt to measure the backlash in
                                  > > > > the
                                  > > > > > > > > screw.
                                  > > > > > > > > > > There was none,
                                  > > > > > > > > > > > nada,
                                  > > > > > > > > > > > > > zero, zip, zilch! There may be
                                  > > > > some
                                  > > > > > > very
                                  > > > > > > > > > > small penalty in
                                  > > > > > > > > > > terms
                                  > > > > > > > > > > > of
                                  > > > > > > > > > > > > > service life, but for a hobby
                                  > > > > machine,
                                  > > > > > > > > it'll
                                  > > > > > > > > > > never see enough
                                  > > > > > > > > > > > service
                                  > > > > > > > > > > > > > to come within even 50% of the
                                  > > > > > > theoretical
                                  > > > > > > > > > > service life
                                  > > > > > > > > > > anyway. I
                                  > > > > > > > > > > > > > suspect contamination and
                                  > > > > corrosion
                                  > > > > > > will
                                  > > > > > > > > be
                                  > > > > > > > > > > far greater risks.
                                  > > > > > > > > > > > And
                                  > > > > > > > > > > > > > even if they do eventually fail,
                                  > > > > many
                                  > > > > > > > > years
                                  > > > > > > > > > > from now, new ones
                                  > > > > > > > > > > are
                                  > > > > > > > > > > > > > not all that expensive (I paid
                                  > > > > $650
                                  > > > > > > for
                                  > > > > > > > > all
                                  > > > > > > > > > > three screws - two
                                  > > > > > > > > > > 1"
                                  > > > > > > > > > > > and
                                  > > > > > > > > > > > > > one 5/8" - and all six nuts).
                                  > > > > Worst
                                  > > > > > > case
                                  > > > > > > > > > > maybe I have to
                                  > > > > > > > > > > replace
                                  > > > > > > > > > > > > > them in 15 years. Who cares?
                                  > > > > This
                                  > > > > > > > > approach
                                  > > > > > > > > > > makes the
                                  > > > > > > > > > > > fabrication of
                                  > > > > > > > > > > > > > the double nut assemblies
                                  > > > > absolutely
                                  > > > > > > > > trivial.
                                  > > > > > > > > > > > > > Nook did send me the wrong
                                  > > > > screw
                                  > > > > > > for
                                  > > > > > > > > the Z
                                  > > > > > > > > > > axis (0.250" lead
                                  > > > > > > > > > > > > > instead of the 0.200" lead I
                                  > > > > ordered),
                                  > > > > > > but
                                  > > > > > > > > I'm
                                  > > > > > > > > > > sure they will
                                  > > > > > > > > > > > > > straighten that out quickly.
                                  > > > > They've
                                  > > > > > > been
                                  > > > > > > > > > > very responsive so
                                  > > > > > > > > > > far.
                                  > > > > > > > > > > > > > This whole conversion is going
                                  > > > > to
                                  > > > > > > be
                                  > > > > > > > > FAR
                                  > > > > > > > > > > easier, and FAR
                                  > > > > > > > > > > > better,
                                  > > > > > > > > > > > > > than the one I did on my
                                  > > > > mini-mill!
                                  > > > > > > > > > > > > >
                                  > > > > > > > > > > > > > Regards,
                                  > > > > > > > > > > > > > Ray L.
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