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
