Hardware is Tormach 770 with Mesa 7i92 > -----Original Message----- > From: Gene Heskett [mailto:ghesk...@shentel.net] > Sent: Saturday, June 20, 2020 5:17 AM > To: emc-users@lists.sourceforge.net > Subject: Re: [Emc-users] Universal spindle speed control for $7 > > 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
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