I am new here and to cnc machining. I just picked up a used machine and I am starting to have a problem with the stepper motor after 25-30 min of running a program. It will be moving as it should but when there is a command to rapid to the next position it will start to move then start humming and it stops moving but the read out on the controller shows that the table is moving even through it did not move.

I don’t want to start replacing parts it does not need but I’m guessing it’s either a stepper motor or stepper driver going bad when it gets warm.

Steppers are NEMA34 1600oz and drivers are cw1108