On Saturday 20 June 2020 00:20:46 Thaddeus Waldner wrote: > Just a thought: > > Since the index pulse is only one PPR, does it keep working and is it > readable right up to 10k rpm? If so, you could first read the index > pulse; if speed> threshold, multiply index by encoder ppr and connect > that to encoder in; if speed < threshold (-hysteresis?), connect main > pulse to encoder input. > > I’m writing this having no idea what kind of hardware you have or if > it’s even possible. > > > On Jun 19, 2020, at 10:43 PM, Jon Elson <el...@pico-systems.com> > > wrote: > > > > On 06/19/2020 10:30 PM, andy pugh wrote: > >>> On Sat, 20 Jun 2020 at 04:05, Ken Strauss <ken.stra...@gmail.com> > >>> wrote: > >>> > >>> Obviously I'm not contemplating threading at 10K RPM! However, I'd > >>> like to leave the encoder installed at all times which is why I'm > >>> concerning about it surviving at high RPM. > >> > >> My guess would be that it won't explode, it will just stop > >> counting. And that probably isn't actually a problem. > >> > >> Qou only really care about accurate counting at low speeds. > > > > Well, I have a spindle RPM display on a PyVCP on my mill, it is nice > > to check that I'm getting the right speed. > > > > Jon
It seems to me that if a 1000 line ABZ encoder was geared down 4/1, that the .ini file SCALE for the spindle would then be 1000, not 4000, and if the geardown was an integer divisor, like 4, the index pulse generated would still be coherent to the spindle position, and would be the equ of missing the index for 3 of the 4 rotations, but the 4th would trigger a rigid tap cycle that with the 1000 scale, would still do the correct G33.1 tap cycle since I have been told that the ONLY thing the index is used for is the cycle start point. If the SCALE is 1000, not the 4000 it would be for a 1/1 correspondence, the only side effect would that when arriving at the starting position and waiting for an index, it might wait as much as 3 turns, but should still fire on the index and do its thing, executing a normal rigid tap cycle. So tell me why it wouldn't work... And I don't think thats thinking that far outside the box. 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
