ok, I'm out of ideas. shortening the cables has definitely helped some, but I still cant get the tuning to be 'damped" with no overshoot. this is at pretty much all speeds, and all accelerations. I went to 0.01G al the way to 1G (quite scary). the amount of overshoot changes with acceleration, for example from .001" down to .0005", but its still there and still resonating and clunking. I even played with the gain on the drive, going to minimum, and raising it above what it was.
maybe its just the lack of jerk control, but I don't see that.
I put the old control back online and it is, with no question, vastly smoother. its not perfection, you still feel the odd lump at low speeds (2ipm) but theres no comparison. so the drives and motors obviously work well enough.
I was thinking of figuring out how to make an Arduino drive one axis "blind" but I'm not sure what that would tell me that I don't already know (as in, we already know the motors can be smooth).
