so you mean that it is not possible? If thats the case, then i have to manually cut threads until it is possible :)
thats probably something that has to be changed in linuxcnc/machinekit (that, in case of a stepgen velocity spindle config, the direction pin only changes state after ramping down to 0 rpm and then changing state.) Am Sonntag, 23. April 2017 14:20:46 UTC+2 schrieb Schooner: > > > On 23/04/17 12:35, Sag ich Dir nich wrote: > > i noticed now, that when i command m4 and then m5, the dir pin changes > also, which it should not. It does not change when i command m3 and then m5 > > > That may be reverting to default state. > > Mine has to latch the relay to engage M4, but M3 is its 'resting state'. > > Same for dir, there will be a default, exactly what depends upon whether > you are using the pin value or its inverted value, that corresponds > to one dir or the other when it is powered off. > > > Am Sonntag, 23. April 2017 10:59:59 UTC+2 schrieb Schooner: >> >> 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 [email protected]. >> 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 [email protected] <javascript:>. > 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. 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