I have a milltronics Partner 1 cnc machine and the y axis motor jumps real bad unless my feed is real slow or real fast. Called milltronics and they said it sounded like the tach was dirty. I cleaned the tach to the best of my ability but still same problem. It doesnt seem to be losing position so I didn't think it was the encoder. Anyone have any ideas?
Try swapping the drives if they are identical to the other axis.
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