> From: Matthew Herd [mailto:herd.m...@gmail.com] > Hi John, > > I�m just confused, since I�m not clear on how the signal would then be > communicated if both parameters are set to 0. I did try both > with zero initially and didn�t observe any movement so I went to P=1. Then I > saw very slow movement. That prompted me to tune > for the limit of stability per some instructions I found. But at the end of > the day the steady state jog ferror just increases for all > reasonable P values in LinuxCNC regardless of the drive tune. I was planning > to try P=0 and FF1=1 next. > > Matt
That didn't work for me. I think it was Andy that clued me in that I had to have P=0 and FF1=0 to disable the PID part of the LCNC. Since the servo drive does it anyway and the acceleration (speed that step pulses change) is defined by the INI file. These are from my Spindle. MAX_VELOCITY = 50.0 MAX_ACCELERATION = 300.0 # The values below should be 25% larger than MAX_VELOCITY and MAX_ACCELERATION # If using BACKLASH compensation STEPGEN_MAXACCEL should be 100% larger. STEPGEN_MAXVEL = 62.5 STEPGEN_MAXACCEL = 375.0 What type of drive is it and can you set the parameters easily? John _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
