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Re: [atlas_craftsman] 3996 crossfeed speeds, was 3996 crossfeed nuts class 4g

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  • tk1161
    ... not sure how/if I would ever use them, but there is a set of four up there, just not 100% sure if they are good or not, they seem to have a pretty small
    Message 1 of 69 , May 9, 2013
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      On Wed, 8 May 2013 17:55:49 -0400 (EDT), wa5cab@...:

      >OK. You have quite an assortment of drill chucks. Dogs turn up on eBay
      >pretty frequently. Except for the split one for turning square stock.

      not sure how/if I would ever use them, but there is a set of four up
      there, just not 100% sure if they are good or not, they seem to have a
      pretty small opening on them for stock/part


      >Robert D..
      >In a message dated 05/08/2013 14:37:33 PM Central Daylight Time,
      >tmgsr@... writes:
      >> >Tom,
      >> >
      >> >Actually, the instructions on pg 9 are telling you where to place the 40T
      >> >sliding gear. I.e., whether to mesh it with the 16T (OUT) or 32T (IN) of
      >> the
      >> yup, I miss spoke sorry about that confusion there
      >> >compound gear. You don't do anything to the compound gear.
      >> >
      >> >I don't know where this new compound gear Jon mentioned would go. But I
      >> do
      >> >know that it does not/can not go in place of the existing 16/32T compound
      >> >gear. The center to center distance between the compound gear and the
      >> >tumbler gear above that drives it is fixed to match the 32T gear. I
      >> haven't
      >> >actually looked to see whether the larger gear would hit anything or not
      >> but if
      >> >you replaced the 16/32T with a 64/32 you would speed up all of the feeds
      >> by
      >> >4X.
      >> >
      >> >I would suggest getting the 3996 back up and running first. If/when you
      >> >come across the article you once saw, see what it actually says. But in
      >> the
      >> >meantime, the machine worked well as designed.
      >> it is up and running now, I jus tposted a pic of it and the stuff I
      >> have with it so far, I do have other bits though, I have two face
      >> plates but none of the dogs for them, I have the 4 jaw chuck too and
      >> still have not taken the time to find the pinion screws
      >> thanks for everyone's help, it is pretty tight now with new nuts and
      >> screws too!
      >> >
      >> >Robert D.
      >> >
      >> >In a message dated 05/08/2013 07:01:29 AM Central Daylight Time,
      >> >tmgsr@... writes:
      >> >>>>>Tom,
      >> >>>>>
      >> >>>>>I think that you must be referring to the Sliding Gear, which meshes
      >> >>with
      >> >>>>>the 16/32T compound gear on the reversing tumbler. It doesn't slow
      >> >>down the
      >> >>>>>lead screw. It speeds it up, to give you the top row of threads
      >> shown
      >> >>on
      >> >>>>>the chart on the QCGB. The Sliding Gear is normally operated in the
      >> >>OUT
      >> >>>>>position. With it in the IN position, and the selector handles set
      >> to
      >> >>E9
      >> >>>>>(.0042") feed, the feed would actually be .0084", not .0021". It's
      >> >>explained on
      >> >>>>>Page 9 of the 3996 manual. The earlier Atlas manual on the models up
      >> >>through
      >> >>>>>3991 does a better job of explaining, I think. Although the photos
      >> in
      >> >>the
      >> >>>>>copy we have are rather poor.
      >> >>>>>
      >> >>>Right, but you have to add an additional set of gears into the train.
      >> >>>That's
      >> >>>why the gear bracket on the QC has room for all those gears. This can
      >> be
      >> >>>done for metric threads, as well. So, if you inserted a 32/64 gear
      >> set,
      >> >>>with the driving gears turning the 64, and the 32-tooth gear driving
      >> the
      >> >>
      >> >>I'm going to have to look at this closer and see if I understand it
      >> >>correct this time, I am now to assume the sliding gear (h on pg 9) set
      >> >>16/32 will only increase above the .0042 and I will need to replace
      >> >>that set with a 32/64?
      >> >>
      >> >>confused a bit still on this, I just now realized that the directions
      >> >>on page 9 are telling me where to have the 16/32 gear placed for a
      >> >>particular feed or thread.
      >> >>At first I did not realize where the plate said in/out it was about
      >> >>that sliding gear, I thought it was for the in/out of the back gear-
      >> >>again the light bulb came on and I realize that really has nothing to
      >> >>do with the feed distance per spindle revolution
      >> >>
      >> >>duh...
      >> >>
      >> >>Thanks
      >> >>tom
      >> >>
      >> >
      >> >Robert &Susan Downs - Houston
      >Robert & Susan Downs - Houston
      >wa5cab dot com (Web Store)
      >MVPA 9480
    • wa5cab
      Pretty much any dog will work if it s the right size. :-) Armstrong made the same lathe dogs from at least the 30 s until at least the 80 s. If you ll send
      Message 69 of 69 , May 12, 2013
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        Pretty much any dog will work if it's the right size.  :-)

        Armstrong made the same lathe dogs from at least the 30's until at least the 80's.  If you'll send me the Item Number, I'll take a look at them.

        Robert Downs - Houston
        wa5cab dot com (Web Store)
        MVPA 9480

        In a message dated 05/12/2013 18:38:47 PM Central Daylight Time, tmgsr@... writes:
        >On Thu, 9 May 2013 11:28:17 -0400 (EDT), wa5cab@...:
        >>The original No. 142A set of four sold by Atlas had openings to handle
        >>1/2", 3/4", 1" and 1-1/2".  I would think maybe anything larger might be getting
        >>too heavy.  I bought the set and the face plate to drive it when I bought
        >>my 3996 in 1981.  And have to admit that I've only ever used any of them a
        >>few times.  The two operations where you would definitely need them would be
        >>turning a taper by the tailstock set-over method and checking or setting
        >>tail-stock set over to zero.  The latter being the only usage I can actually
        >ok thank you!

        how do I tell if I'm buoying the correct dogs, there is s et now I was
        looking at, but they said something about them being made in 52, I do
        not see sizes or  part number on them, or will any dogs work?


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