I found this post as I was having the same trouble. I'm very new to Linuxcnc and machinekit so it is entirely possible I don't understand your directions below. I tried to follow your instructions below but, maybe I'm doing something wrong.
I have a gantry style machine where I have two motors and two separate drivers for the Y axis, one is the Y axis and the other is connected to the A axis on a probotix PBX-BB. It is belt driven so I need one axis to turn the other direction. I'm using the latest 10-30-2016 jessie machinekit build and I'm using the probotix hal and ini, specifically the Comet.hal and the CometNP_Metric.ini files. I have modified the ini file under AXIS_1 to have a second SCALE value using the name SCALETWO with the sign reversed. Then in my Comet.hal file I have changed the y2 axis to use the SCALETWO value instead of the SCALE value. It still doesn't work. I have also tried adding an AXIS_3 to the ini file and changing the Comet.hal y2 axis to use AXIS_3 for the scale value. Neither of these has worked for me as the motors still turn in the opposite direction before and after the changes. Just to further clarify, here is what was originally in the files along with my edits below: Original CometNP_Metric.ini file [AXIS_1] TYPE = LINEAR HOME = 320 MAX_VELOCITY = 127.0 MAX_ACCELERATION = 762.0 STEPGEN_MAXACCEL = 952.5 SCALE = -31.4960629921 FERROR = 1 MIN_FERROR = .25 MIN_LIMIT = -3 MAX_LIMIT = 640 HOME_OFFSET = -5 HOME_SEARCH_VEL = -13 HOME_LATCH_VEL = -6 HOME_IGNORE_LIMITS = 1 HOME_SEQUENCE = 1 HOME_FINAL_VEL = 127 Modified CometNP_Metric.ini file [AXIS_1] TYPE = LINEAR HOME = 320 MAX_VELOCITY = 127.0 MAX_ACCELERATION = 762.0 STEPGEN_MAXACCEL = 952.5 SCALE = -31.4960629921 SCALETWO = 31.4960629921 FERROR = 1 MIN_FERROR = .25 MIN_LIMIT = -3 MAX_LIMIT = 640 HOME_OFFSET = -5 HOME_SEARCH_VEL = -13 HOME_LATCH_VEL = -6 HOME_IGNORE_LIMITS = 1 HOME_SEQUENCE = 1 HOME_FINAL_VEL = 127 Original Comet.hal file # y2-axis setp hpg.stepgen.02.position-scale [AXIS_1]SCALE setp hpg.stepgen.02.steplen 2000 setp hpg.stepgen.02.stepspace 2000 setp hpg.stepgen.02.dirhold 35000 setp hpg.stepgen.02.dirsetup 35000 setp hpg.stepgen.02.maxaccel [AXIS_1]STEPGEN_MAXACCEL Modified Comet.hal file # y2-axis setp hpg.stepgen.02.position-scale [AXIS_1]*SCALETWO* setp hpg.stepgen.02.steplen 2000 setp hpg.stepgen.02.stepspace 2000 setp hpg.stepgen.02.dirhold 35000 setp hpg.stepgen.02.dirsetup 35000 setp hpg.stepgen.02.maxaccel [AXIS_1]STEPGEN_MAXACCEL Any help is greatly appreciated. On Tuesday, February 2, 2016 at 4:44:52 PM UTC-5, Charles Steinkuehler wrote: > > On 2/2/2016 3:35 PM, Bas de Bruijn wrote: > > > >> On 02 Feb 2016, at 20:59, Fernando Correa Neto <[email protected] > <javascript:>> wrote: > >> > >> Hi there > >> > >> I have a machine that uses two motors on the Y axis and uses a > configuration that derives from the Probotix config. > >> Currently the config loads just fine but the motors are running in the > same direction which is not what I want since it's a belt driven machine. > >> I've tried to revert the polarity of the A axis, which in PBX-BB land > would be: > >> > >> setp bb_gpio.p9-out-27.invert 1 > > > > This is not the right way > > > > If you want to change the direction of the motor, you can either swap > some motor wires, or negate the scale in your INI file > > If you don't want to swap the motor wires, you can create two scale > values in your INI file. These are simply definitions that get pulled > into the HAL file for use where/as needed, so just change the name of > the scale parameter for your second motor, and add a corresponding > entry to the INI file with the opposite sign. > > -- > Charles Steinkuehler > [email protected] <javascript:> > -- 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.
