Re: [Machinekit] Step/Dir Spindle changes direction immediately (but should not)

[schoone...@btinternet.com]

There was something very familiar about this config, I realised it is adapted from a lathe config I have, using a velocity stepgen, complete with the same comments :-) I must have passed it on at some point. On 22/04/17 19:47, Sag ich Dir nich wrote: Hello, i got the Step/Dir Spindle working with ramping and everything except if i command M4 the Dir pin changes immediately. It should change when the current rpm is 0. What do you base the assertion that it should only change when RPM is 0 upon? This old thread discusses the issue and I don't think anything has changed https://en.industryarena.com/forum/reverse-lathe-turn-m3-m4--67203.html You don't have any connections in your config that will ensure this, no spindle brake, no monitor of spindle speed. The dir pin is a simple bit pin, set to forward or reverse. An easy way to do this is just program M3 S100 ... M5 G4 P5 ;delay to ensure spindle stops M4 S100 Alternately, if you have a spindle brake it needs tying to M5, using detection of 0 RPM spindle etc. The only reason you would reverse spindle direction on a lathe normally, is switching from a conventional cutting tool, to a threading tool or parting tool which is held inverted to aid chip removal or something similar. There is plenty of time to stop the spindle and restart it, before or after the tool change. regards Here is my spindle config: # ################ # B [4] SPINDEL # ################ #   Use a scale module for offset and scaling of the stepgen #   Offset and scale are determined by first calculating and testing # loadrt scale count=1 addf scale.0 servo-thread setp scale.0.in 0 setp scale.0.gain 1.00  # GIVES TRUE 600 RPM in M4 setp scale.0.offset 0 # #   Initialise the stepgen for the spindle # setp hpg.stepgen.04.position-scale    1 setp hpg.stepgen.04.maxvel              8000 setp hpg.stepgen.04.steplen             1000 setp hpg.stepgen.04.stepspace         1000 setp hpg.stepgen.04.dirhold               200 setp hpg.stepgen.04.dirsetup             200 setp hpg.stepgen.04.maxaccel          2000 setp hpg.stepgen.04.steppin              924 setp hpg.stepgen.04.dirpin                926 setp hpg.stepgen.04.control-type       1 #   Enable it net machineison halui.machine.is-on => hpg.stepgen.04.enable #   Connect spindle speed to scaler net spindle-cmd motion.spindle-speed-out => scale.0.in #   Connect scaler output to stepgen velocity net spindle-freq <= scale.0.out => hpg.stepgen.04.velocity-cmd  #   Connect output to the pin for the analog voltage of spindle2 board net spindle-out <= hpg.stepgen.04.steppin => #924 #bb_gpio.p9.out-24  # Some problems setting up logic to match the reversing contactor #   This works, connecting CCW to stepgen DIR to Spindle2 DIR net spindle-rev motion.spindle-reverse => bb_gpio.p9.out-26 i tried commenting out "net spindle-rev motion.spindle-reverse => bb_gpio.p9.out-26" but then it does not change the direction basically what i need is the direction pin to change, when i command the opposite direction, at 0 rpm, after the spindle has ramped down for example M3 S100 M4 S100 (spindle ramps down to 0 rpm then the Dir pin changes state and the spindle ramps up again) i appreciate any help -- 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 machinekit+unsubscr...@googlegroups.com. Visit this group at https://groups.google.com/group/machinekit. For more options, visit https://groups.google.com/d/optout. -- 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 machinekit+unsubscr...@googlegroups.com. Visit this group at https://groups.google.com/group/machinekit. For more options, visit https://groups.google.com/d/optout.