On Tuesday 23 November 2021 21:33:21 John Dammeyer wrote: > Still wondering how I might make the spindle turn slowly and then stop > on a sensor signal. From the HAL file it's set up the same way as the > XYZA axis with respect to step_type and control-type. > > I'd want to set the velocity to say 30 RPM (0.5 RPS) and during a > revolution if it detects an input the motor is stopped. > > # SPINDLE Step Gen signals/setup > setp hm2_7i92.0.stepgen.05.dirsetup [SPINDLE_9]DIRSETUP > setp hm2_7i92.0.stepgen.05.dirhold [SPINDLE_9]DIRHOLD > setp hm2_7i92.0.stepgen.05.steplen [SPINDLE_9]STEPLEN > setp hm2_7i92.0.stepgen.05.stepspace [SPINDLE_9]STEPSPACE > setp hm2_7i92.0.stepgen.05.position-scale [SPINDLE_9]STEP_SCALE > setp hm2_7i92.0.stepgen.05.step_type 0 > setp hm2_7i92.0.stepgen.05.control-type 1 > setp hm2_7i92.0.stepgen.05.maxaccel > [SPINDLE_9]MAX_ACCELERATION setp hm2_7i92.0.stepgen.05.maxvel > [SPINDLE_9]MAX_VELOCITY > > net spindle-enable => hm2_7i92.0.stepgen.05.enable > net spindle-vel-cmd-rps => hm2_7i92.0.stepgen.05.velocity-cmd > For that sort of accuracy, put high rez a/b encoder on the motor armature, but get the index from a hall effect watching the socket. That will pretty much do away with quantization noise and will let you set the stopped point to a small fraction of a degree.
Or use that stepper with at least a 10x geardown if it has enough twisting power. Or a stepper with a 90 degree worm drive. I have one of the small ones with a 5/1 worm that might be able to do my g0704 with a 3NM nema23 on it. But they make that one at much higher ratios than this 5/1. There's also good looking plantary inline reducers for nearly the same money that look stronger than a worm drive. > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users 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, 1940) 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
