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Re: Column deflections - calculations and results

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  • bs23voe
    Are you talking about a 50bmg bolt. If you are in the US you can make any for your own use that conforms to the law. I have lots of IGS files that can be used
    Message 1 of 59 , Mar 1, 2006
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      Are you talking about a 50bmg bolt. If you are in the US you can make
      any for your own use that conforms to the law. I have lots of IGS
      files that can be used in CadCam programs to create tool paths for
      CNC. Email me if you need them.

      Thanks
      Doc



      --- In mill_drill@yahoogroups.com, "Randy" <Rswart1@...> wrote:
      >
      > Nooo ...
      > Though I would love ot make a CPS type receiver .. i.e. BR Rifle .
      > BUT .. The darn broaches for the bolt lug recesses are a killer in
      price ..
      > You know of any other way to do that ??
      >
      > Randy
      >
      >
      > -----Original Message-----
      > From: mill_drill@yahoogroups.com [mailto:mill_drill@yahoogroups.com] On
      > Behalf Of bs23voe
      > Sent: Monday, February 27, 2006 9:01 PM
      > To: mill_drill@yahoogroups.com
      > Subject: [mill_drill] Re: Column deflections - calculations and results
      >
      > Randy are you making AK receivers.
      >
      > Doc
      >
      > --- In mill_drill@yahoogroups.com, "Robert George" <roberttgeorge@>
      > wrote:
      > >
      > > --- In mill_drill@yahoogroups.com, "Randy" <Rswart1@> wrote:
      > > >
      > > > My cuts seem to be pretty precise, etc ..
      > >
      > > The tolerance of your work will depend on what you're making.
      > >
      > > The gunsmithing you described earlier (machining slots/holes in a
      > > stamped receiver) doesn't require high tolerance. A steam engine will
      > > require more precision, and a home-built turbine engine even more.
      > >
      > > I'm building the Phil Duclos air spindle, and the bore has to be
      > > turned to a tolerance of +- 0.0002" (2 tenths). It's a big
      challenge,
      > > and a lot of fun, but certainly atypical of the tolerances that I do.
      > >
      > > > More so than the milling texts say you will Get from the average
      > > > Milling machine ..
      > >
      > > You won't get the level of accuracy from a Mill/Drill that you will
      > > from a commercial machine in good condition, but it certainly will be
      > > accurate enough for most hobby projects.
      > >
      > > I've found that one of the biggest challenges in being a self-taught
      > > (hobby) machinist is determining how much tolerance is good enough.
      > >
      > > I'm an engineer (electrical) by trade, so I have the natural
      > > inclination to overdesign things. The tolerances section of the
      > > Machinery's Handbook was a real eye opener to me -- especially
      > > interference fitting (press fits, shrink fits,...) to install
      > > bearings, swing arms, etc.
      > >
      >
      >
      >
      >
      >
      >
      >
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    • Robert George
      Message 59 of 59 , Mar 2, 2006
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        --- In mill_drill@yahoogroups.com, "bs23voe" <bs23voe@...> wrote:
        >
        > Robert
        >
        > You can purchase an 80% receiver and build it into a legal gun
        > with no federal registration, or restrictions.

        That's what I said:

        > --- In mill_drill@yahoogroups.com, "Robert George" <roberttgeorge@>
        > wrote:
        > >
        > > --- In mill_drill@yahoogroups.com, "Randy" <Rswart1@> wrote:
        > > >
        > > > I was also asked offline about the legalities of making your
        > > > own receiver ..
        > >
        > > I thought making (or finishing) your own receiver falls under the
        > > ATF 80% rules? I didn't think you needed an ATF license for the
        > > 80% guns?
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