Hello,
I am attempting to tune my machine, running rutex drives and emc2.
I command a drive to move 8 inches one direction reverse and return to zero.
G1 X-8.0 F10 G1 x0.0 F10. When I test with a dial indicator if the machine
returned I see that I over traveled .005". I retuned the drive and increased
the "i" value and adjusted p and d to reflect the increased i. I rerun my 8
inch test and find I returned to zero.
I then run the same test but with twenty inches of motion and find myself 2
thousands short. Just to see what would happen I increased my feed rate from 10
to 15ipm. Suddenly the machine returns to zero. I increased the feed to 30ipm
and I overshoot.
It appears that I have a velocity dependent situation. I honestly have
little background in PID tuning, is this a drive tuning issue or is this an EMC
config issue? I am using the sample_inch.ini config and have only changed the
steps per inch, reduced the max acceleration, and max velocity to reflect my
machine.
Thanks,
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