Hey Andy I hear you. Great idea on using CAD. There are many ways to do it. And Using CAD is awesome.
On Sat, Aug 1, 2020, 5:32 PM Gregg Eshelman via Emc-users < emc-users@lists.sourceforge.net> wrote: > Have the person with the lathe use it to externally thread a length of > metal so it will screw into something he already has to screw onto the > spindle. Then he can ship that to you to use for a fit testing piece. > > On Friday, July 31, 2020, 4:26:20 AM MDT, stjohn gold < > thesaint4...@gmail.com> wrote: > Hi Andy, > great post, thanks! It all goes to show that threads are complicated. Some > of those standards were written over a period of 20 years, that is no joke. > Nothing to physically test your fit against - brave! > > cheers, St.john > > On Thu, Jul 30, 2020 at 9:54 PM andy pugh <bodge...@gmail.com> wrote: > > > (Or "Why do I always take 4 goes at a fit with G76") > > > > I recently had the occasion to think harder than normal about threads, > > and especially about their sizing and fits. > > Threads were one of the very first things to be standardised and made > > interchangeable, largely through the work of Josiah Whitworth. And it > > turns out that they are one of the more complicated things to > > standardise. > > The reason I was thinking about this was that I was trying to make a > > lathe faceplate for someone a few hundred miles away. I know that his > > spindle nose is 2 1/4" BSF. (ie, one of Whitworth's threads) but have > > nothing to use for a trial fit. > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
