There was an article in Model Engineer Magazine (British publication) on
doing it at home. See Volume 176, Issue 4017, page 464. I have a scan of the
article but it is too large to post.

> -----Original Message-----
> From: John Kasunich [mailto:jmkasun...@fastmail.fm]
> Sent: Sunday, February 07, 2016 4:47 PM
> To: emc-users@lists.sourceforge.net
> Subject: Re: [Emc-users] Any idea how they machine these?
>
> A post on this page:
> http://yarchive.net/metal/artillery_thread.html
>
> says:
>
> In full size practice the male and female threads are SCREWCUT (not
Milled)
> on specially adapted, relieving lathes with an interrupted indexing
motion.
> This usually takes the form of a special, heavy duty, "geneva" type
motion.
> Contemporary accounts speak of "great crashings and bangings and sudden
> shuddering stops" accompanied by a tool point that moves in and out, under
> cam control, to cut the various thread diameters.
>
>
>
> On Sun, Feb 7, 2016, at 04:35 PM, John Kasunich wrote:
> >
> >
> > On Sun, Feb 7, 2016, at 04:18 PM, andy pugh wrote:
> > > Maybe I should have been more explicit about the question...
> > >
> > > How do you machine an internal part-thread that ends hard against a
> shoulder?
> > >
> >
> > Very carefully :-)
> >
> > This pic
> > http://www.eugeneleeslover.com/PAGE_56_Figure_5B10_C.JPG
> > shows that there was a bit of a relief groove.  Cutting speeds in
> > those days were slower (no carbide).  They may have simply run the
> > parts slow enough that a rapid-retract toolholder could pull clear in
> > the time it took to travel the width of that groove.
> >
> >
> >
> >   John Kasunich
> >   jmkasun...@fastmail.fm
> >
> > ----------------------------------------------------------------------
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>
> --
>   John Kasunich
>   jmkasun...@fastmail.fm
>
>
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