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General Mach Discussion / Stepping problems with slow feed rates.. Help!
« on: January 26, 2006, 02:21:05 PM »
Hi everyone,
I am new guy here, and I have a frustrating problem. I am setting up a Taig cnc mill (for the University of Washington), with 1.8 degree stepper motors, being driven by a Deep Groove motor controller. I have the mill calibrated reasonably well, but whenever I run a g-code file, or input code by hand on the MDI screen of Mach 3 which has a move of type G1, G2 or G3 and the feed rate is between 3.0 and around 8.0, my motors stall eventually and start missing steps. I have optimized XP according to the docs, double checked that enhanced pulsing is on (and tried it off), switched into and out of Sherline mode, inverted pins, changed and changed acceleration and velocity settings, changed pulse width settings, etc.. basically I have tried everything I have heard suggested in the forums. Ugh. The waveform in the driver test is perfect, a smooth straight line and the diagnostics screen shows Mach 3 outputting 24050 pulses.
If I run a rapid feed move of G0 I have no problems. Once the motors begin missing steps the accuracy is shot, and run is over..
Any ideas? Thanks a million.
Peter
I am new guy here, and I have a frustrating problem. I am setting up a Taig cnc mill (for the University of Washington), with 1.8 degree stepper motors, being driven by a Deep Groove motor controller. I have the mill calibrated reasonably well, but whenever I run a g-code file, or input code by hand on the MDI screen of Mach 3 which has a move of type G1, G2 or G3 and the feed rate is between 3.0 and around 8.0, my motors stall eventually and start missing steps. I have optimized XP according to the docs, double checked that enhanced pulsing is on (and tried it off), switched into and out of Sherline mode, inverted pins, changed and changed acceleration and velocity settings, changed pulse width settings, etc.. basically I have tried everything I have heard suggested in the forums. Ugh. The waveform in the driver test is perfect, a smooth straight line and the diagnostics screen shows Mach 3 outputting 24050 pulses.
If I run a rapid feed move of G0 I have no problems. Once the motors begin missing steps the accuracy is shot, and run is over..
Any ideas? Thanks a million.
Peter