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 > > > > ---------------------------------------------------------------------- > > -------- > > Site24x7 APM Insight: Get Deep Visibility into Application Performance > > APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month > > Monitor end-to-end web transactions and take corrective actions now > > Troubleshoot faster and improve end-user experience. Signup Now! > > http://pubads.g.doubleclick.net/gampad/clk?id=272487151&iu=/4140 > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > -- > John Kasunich > jmkasun...@fastmail.fm > > ---------------------------------------------------------------------------- -- > Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + > Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor > end-to-end web transactions and take corrective actions now Troubleshoot > faster and improve end-user experience. Signup Now! > http://pubads.g.doubleclick.net/gampad/clk?id=272487151&iu=/4140 > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=272487151&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
