On Saturday 20 March 2021 21:21:56 andy pugh wrote: > On Sun, 21 Mar 2021 at 01:12, Gene Heskett <ghesk...@shentel.net> wrote: > > It seems to me there ought to be a std math rule for that, but I've > > not found a reliable reference. > > Why do you think that? Surely the manufacturer can make any flat that > they want?
This is true, but most of this stuff has a best practices doc buried someplace on or in this planet. > I would measure the actual shaft (flat to rounded opposite curve) then > dimension my sketch to that actual number (my printer shrinks holes, > so I wouldn't make it any tighter deliberately) So does mine, if I want a 8mm bolt hole, I draw an 8.25mm,but a bar 100mm long measures 99.8. Doesn't coorolate all taht well. Thanks Andy. Take care and stay well. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
