a little of my system specs
96000 baud 8 bits, 1280 per mm, vel 850 accel 160
16microsteps with 2x reduction with belt drives
4.2 amp drivers and steppers.
windows 7 32
look ahead of 20
Ive been trying to reconfigure my stepper motors to get rid of some horrible harmonics so have changed the default setting they came with from 5 micro steps and 400 pp mm to 16 micro steps and 1280 ppmm. This has seemed to help so far however if I bump up the feed rate on a test arc cut (200%) of the feed rate which was 300mm/min I get a strange pulsing every second or so, I tried to play around with baud rate and the frequency which seemed to have no effect. Its like the motors go through a slight speed reduction and then increase. If I use the standard 300mm/min feed from the Gcode then I dont have that problem. I have searched the forums and other places but cant seem to come up with much. I thought perhaps it was just a lack of speed of my cpu but its not above 15%. I didnt get to try and change the look ahead but maybe i need more than 20. I thought also maybe its a problem of power though my pre built system says it can do up to 150 microsteps and I get no problem moving all 3 axis at the same time at the highest speed while jogging.
Anyone experience something like this before?