That is a good question, and one we have recently asked ourselves. In fact we changed our threading routine to fix the RPM because at least then the spindle is not constantly accelerating and decelerating. But, to be honest, CSS should work fine, all it does it change the spindle speed for a given diameter. It does add a variable to the synchronization though (since it needs to accel/decel).
However, even with fixed RPM we still cut better threads if we start well off of the start of the thread giving the machine more time to synchronize. That is, when we start threading from 0.25 to -1 we get better threads then we start threading from 0 to -1. -Tom > On Feb 4, 2018, at 2:08 PM, Gene Heskett <ghesk...@shentel.net> wrote: > > On Sunday 04 February 2018 13:52:33 andy pugh wrote: > >> On 30 January 2018 at 22:42, <tom-...@bgp.nu> wrote: >>> We read that G33 will wait for spindle-at-speed before looking for >>> the index pulse. But our spindle-at-speed signal seems to be high >>> during the full cycle once the spindle speeds up the first time. >> >> How is your spindle-at-speed signal calculated? > > I went back to the OPost, and my question would have been why is Tom > mixing CSS with a threading operation? From my personal experience, a > solidly set spindle speed, and a stiff control are needed for best > quality threads. Throwing any CSS into that pot would "poor form". > > HMMV of course, but thats my $0.02. > -- > 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) > Genes Web page <http://geneslinuxbox.net:6309/gene> > > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
