I just reverted to a LinuxCNC configuration that isn’t setup to use the encoder. The spindle speed is much more consistent without the feedback from the encoder??
On Tue, May 5, 2020 at 8:19 PM Dan Henderson <luvtof...@gmail.com> wrote: > I have LinuxCNC fully operational. In halscope I’m able to view the > signals for both the spindle index, phase a, and I now have phase b hooked > up. I’m conducting my testing with the LinuxCNC MDI. The number on the > opto chips is EL817C807. > The BOB PN is DB25-1205. > > > > On Tue, May 5, 2020 at 8:08 PM Gene Heskett <ghesk...@shentel.net> wrote: > >> On Tuesday 05 May 2020 20:17:45 Dan Henderson wrote: >> >> > Slowing things down had marginal effect. Okay sounds like I need to by >> > pass the optocouplers. Would you recommend I bypass all the encoder >> > inputs as well as the PWM output to the MC2100 controller? >> >> Only if it has opto's for isolation, they can effect to duration of the >> pwm playing hob with the speed linearity. If the motor is "hunting", >> something else is going on. The m2100 ISTR is the controller that came >> in the treadmill and its a very serious case of built by lowest bidder, >> I was not able to use it in anything I've tried. Control was extremely >> non-linear until I put a 47k resistor between linuxcnc and its summing >> point, That helped but it was still flaky. Not to mention that all of >> its control circuitry is on the hot side of the power line and quite >> dangerous. >> >> I am not a machinist, but a long retired broadcast engineer and a CET so >> much of the high power stuff comes out of my junk box. The psu for >> instance, makes about 120 volts DC at a surge current of 20 amps, 10 >> forever, way more that the 1hp motor I'd put on the back of a 7x12 lathe >> is rated for. Capable of getting 2hp out of that 90 volt motor. But it >> kept breaking drive parts once I had obtained one of the pico systems >> pwm-servo drivers. So I've gone into the hal file and slowed the motors >> acceleration to something that doesn't break stuff any more. But that >> might explain why my troubleshooting is geared to the electronics, and >> possibly is different than what a real machinist might do to solve an >> identical problem. >> >> Other than that it doesn't sound as if the opto's speed is your problem. >> >> So 2 other questions: >> >> What to you have in the way of meters and oscilloscopes for >> troubleshooting? >> >> Do you actually have LinuxCNC running well enough to try to control your >> motor? >> >> 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
