Originally posted by mgamber
servo's, not steppers.
Mach1
It appears that the machine only does this without a load. I am wondering if it is enertia. |
If your servo drives have encoder feedback, this would be a very strange problem to have. The parts of the machine you can check would be the motor coupling to ballscrew, and the encoder coupling to the motor or screw. Any looseness here could cause a misposition.
Servo loops cannot normally tolerate any misposition, because the feedback from the encoder forces a voltage differential that should force the motor to a position that minimizes the difference between the commanded position and the actual position. However, if a circuit board fails, anything becomes possible.