Hi John, motion.spindle_brake - genius! Tried it out and it does exactly how I wanted it. BTW, break signal seems to be active when machine is off/e-stop.
Adapted spindle section below. Now I just need to add in a ramp down, the servo takes the stop a bit too seriously for my taste ;) Thanks a lot! Markus # ################ # Spindle [3] # ################ newsig spindle-enable bit sets spindle-enable FALSE # spindle wiring net spindle-enable <= motion.spindle-brake net spindle-enable => bb_gpio.p8.out-37 net spindle-enable => hpg.stepgen.03.enable net spindle-velocity <= motion.spindle-speed-out-rps net spindle-velocity => hpg.stepgen.03.velocity-cmd setp hpg.stepgen.03.dirpin 835 setp bb_gpio.p8.out-37.invert 1 # timing parameters setp hpg.stepgen.03.dirsetup [SPINDLE]DIRSETUP setp hpg.stepgen.03.dirhold [SPINDLE]DIRHOLD setp hpg.stepgen.03.steplen [SPINDLE]STEPLEN setp hpg.stepgen.03.stepspace [SPINDLE]STEPSPACE setp hpg.stepgen.03.position-scale [SPINDLE]SCALE setp hpg.stepgen.03.maxvel [SPINDLE]STEPGEN_MAX_VEL setp hpg.stepgen.03.maxaccel [SPINDLE]STEPGEN_MAX_ACC setp hpg.stepgen.03.control-type 1 setp hpg.stepgen.03.steppin 833 On Sat, 18 Jul 2020 16:41:22 -0700 "John Dammeyer" <[email protected]> wrote: > Hi Markus, > I've been mulling over the same thing with my new Spindle Servo > that's currently running PWM but will eventually be switched over to > Step/Dir. > > The enable to it is the same one to all the other servos and stepper > drive. > > What I was thinking of doing was using the compliment of the brake > signal to gate the enable to the drive. While the BRAKE is ON the > ENABLE is OFF. Set RPM to 0 without an M5 and the BRAKE doesn't come > ON and the spindle is still held in position by the servo. Issue an > M5 and the brake is ON which shuts off the ENABLE. An M3 with any > Sxxx will disable the BRAKE and setting the ENABLE ON. > > In either case I still have to bring out a separate output to the > servo enable rather than the common output to all the drives. And > with that said it would be possible to just use the BRAKE as the > servo enable. I suspect BRAKE is not asserted during ESTOP so the > spindle would continue to spin. Not a good thing. > > John Dammeyer > > > -----Original Message----- > > From: [email protected] > > [mailto:[email protected]] On Behalf Of markus Sent: > > July-18-20 2:53 PM To: justin White > > Cc: Machinekit > > Subject: Re: [Machinekit] question about motion.spindle-on > > > > Sorry for my sloppy terminology. My servo has 3 input pins, > > enable/step/dir. If enable is asserted it holds the position, > > otherwise the shaft can be turned freely. Which is the behaviour I > > am looking for. I want the spindle to not be engaged for manual > > tool changes, touch offs and such. But then I want the spindle to > > hold its position for tightening the drawbar and things like that, > > kinda like a poor man's version of a spindle lock. > > > > Unfortunately the pin motion.spindle-on does not assert just > > because I issue a M3 or M4 command, it also requires S to be non 0. > > This is the behaviour I see on the oscilloscope which is not good > > because I need the enable pin of the servo to be asserted for it to > > hold its position. > > > > Hope this makes more sense. > > > > > > On Sat, 18 Jul 2020 17:11:20 -0400 > > justin White <[email protected]> wrote: > > > > > motion.spindle-on is a pin, "spindle-enable" is your signal. > > > > > > You don't need to trip the "....stepgen.NN.enable" pin to have a > > > step/direction servo hold position, you just stop sending it > > > pulses which "m3 s0" should do with no further interaction. > > > disabling the stepgen does not cause the servo to go limp because > > > the drive should be setup in position mode and stepgen only sends > > > steps to alter position. Holding a position is always assumed in > > > position mode servos. > > > > > > What may be happening that you didn't mention is that when you > > > enter M3 S0 it trips the motion.spindle-on pin and since it is > > > connected to the stepgen.enable pin it may be causing your drive > > > to fault out. If your spindle is at speed and you immediately > > > disable the stepgen there is no (de)accelleration curve and your > > > drive may fault. > > > > > > Otherwise you can connect the stepgen.enable to > > > "motion.motion-enabled" or motion.power-on(or something like that) > > > depending on how you want it to work. > > > > > > On Sat, Jul 18, 2020 at 12:08 PM markus <[email protected]> wrote: > > > > > > > I replaced my spindle with a servo motor and was hoping to use > > > > "M3 S0" to hold the current position of the spindle. The signal > > > > "motion.spindle-on" however only asserts if S>0, when S==0 the > > > > signal is not asserted. > > > > > > > > Is there a different signal I could use? Should this work? > > > > > > > > Thanks in advance, > > > > Markus > > > > > > > > ... > > > > # ################ > > > > # Spindle [3] > > > > # ################ > > > > > > > > newsig spindle-enable bit > > > > sets spindle-enable FALSE > > > > > > > > # spindle wiring > > > > net spindle-enable <= motion.spindle-on > > > > net spindle-enable => bb_gpio.p8.out-37 > > > > net spindle-enable => hpg.stepgen.03.enable > > > > net spindle-velocity <= motion.spindle-speed-out-rps > > > > net spindle-velocity => hpg.stepgen.03.velocity-cmd > > > > > > > > setp hpg.stepgen.03.control-type 1 > > > > setp hpg.stepgen.03.steppin 833 > > > > setp hpg.stepgen.03.dirpin 835 > > > > > > > > # timing parameters > > > > setp hpg.stepgen.03.dirsetup [SPINDLE]DIRSETUP > > > > setp hpg.stepgen.03.dirhold [SPINDLE]DIRHOLD > > > > > > > > setp hpg.stepgen.03.steplen [SPINDLE]STEPLEN > > > > setp hpg.stepgen.03.stepspace [SPINDLE]STEPSPACE > > > > > > > > setp hpg.stepgen.03.position-scale [SPINDLE]SCALE > > > > > > > > setp hpg.stepgen.03.maxvel [SPINDLE]STEPGEN_MAX_VEL > > > > setp hpg.stepgen.03.maxaccel [SPINDLE]STEPGEN_MAX_ACC > > > > > > > > -- > > > > website: http://www.machinekit.io blog: > > > > http://blog.machinekit.io github: https://github.com/machinekit > > > > --- > > > > You received this message because you are subscribed to the > > > > Google Groups "Machinekit" group. > > > > To unsubscribe from this group and stop receiving emails from > > > > it, send an email to [email protected]. > > > > To view this discussion on the web visit > > > > https://groups.google.com/d/msgid/machinekit/20200716210622.1fcc780f%40yolanda > > > > . > > > > > > > > -- > > website: http://www.machinekit.io blog: http://blog.machinekit.io > > github: https://github.com/machinekit --- > > You received this message because you are subscribed to the Google > > Groups "Machinekit" group. To unsubscribe from this group and stop > > receiving emails from it, send an email to > > [email protected]. To view this discussion on > > the web visit > > https://groups.google.com/d/msgid/machinekit/20200718145232.7b0800be%40yolanda. > > > -- website: http://www.machinekit.io blog: http://blog.machinekit.io github: https://github.com/machinekit --- You received this message because you are subscribed to the Google Groups "Machinekit" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/machinekit/20200718173107.7d925ce1%40yolanda.
