On Friday 22 November 2019 19:07:33 Dmitry Yurtaev wrote: > > This all sounds as if its is only applicable to servo systems, us > > hobbyists with steppers running everything might as well sit back > > and enjoy the "what ifs" since steppers have their own > > insurmountable jerk problems when useing common $40 50 volt drivers, > > and mesa cards. > > but us hobbyists with even cheaper surplus modern servo drives, which > use sub-millisecond position control cycle period, motors with 22bit > encoders and dual feedback are very intrigued. especially if it will > be possible to replace ethercat stuff with another protocol :) > > /dmitry
Much of that comes from a much (10x) higher frequency of servo-thread. I don't know if my rpi4 can do it, but I may experiment to see if a 2 kilohertz servo-thread is an improvement. So I sped it up to 2khz, works fine from a login from here. I'll leave it that way for a while, zero latency excursions while carving a lathe pawn out of 67F air. I actually have 2 threads running as there is a 100 hz thread with all the jog from hand dials stuff in it. I can't turn the jog dials much faster than that anyway. ;-) > _______________________________________________ > Emc-developers mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-developers 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-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
