The encoder on the motor that goes back to the stmbl is pretty high count - like 20k/rev. But only a small ribbed belt between the motor and the spindle. (why I put the gear tooth encoder there)
Maybe a toothed belt is in the future.. - could gear it down a bit more for slow rpm projects like this. On Mon, Mar 30, 2020 at 7:19 AM Gene Heskett <ghesk...@shentel.net> wrote: > On Monday 30 March 2020 07:34:02 andy pugh wrote: > > > On Sat, 28 Mar 2020 at 19:40, Sam Sokolik <samco...@gmail.com> wrote: > > > You can really see the spindle res... > > > http://electronicsam.com/images/greenmachine/IMG_20200328_140150.jpg > > > > Is there a motor encoder? You could try using that instead, especially > > if it's a toothed belt drive. > > I highly recommend it. I have a 1000ppr on the back of my spindle motor, > and some tally switches on the edge of the gear shift knob. So my > operative spindle scale is something over 7k in high gear and a bit over > 14k in low gear. That is such a fine resolution I can run the PID's > Pgain well above 20. There is not a detectable slowdown or even working > hard sound when the load comes on until I hear the iron in the motor > squeaking when the Pico pwm-servo's current limit kicks in at around 17 > amps. > > 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 > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
