On Friday 08 May 2020 06:59:44 andy pugh wrote: > On Fri, 8 May 2020 at 01:23, Gene Heskett <ghesk...@shentel.net> wrote: > > If the spindle speed is steady, I have heard of folks doing rigid > > tapping with 1 ppr. Ditto g76. > > You can do G76 with 1ppr, but not, sensibly, rigid tapping. > > For rigid tapping you need quadrature to detect the moment of spindle > reversal. There is no reliable way to interpolate that. > > Semi-rigid tapping with a floating holder could be an option with a > very low count encoder. > > I think that 100ppr might be enough for tapping. I wouldn't want to go > much lower. > Then choose spindle speeds where the software counter can keep up.
Andy is correct of course, I was wrong about rigid tapping. 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
