Has anyone run across the stepper motors on the K40 getting worn to the point they chatter?
You’ve all probably seen a toy car or cheap DC motor wear to the point that when the motor tries to go fast it slows considerably and chatters as it wobbles in the bushing and how a tiny drop of oil will get it working for a short period. That’s the effect I’m seeing and hearing.
I even removed the X axis bearing, OMG they bolt mirror #2 right to the motor, and ran it out of the machine in raster mode at 200 and 300mm/s over 200mm distance and it noticeably chatters even without side loads like when installed and belts are tightened.
I didn’t think bearings did this but since I popped the back off of the motor, I can feel and see slight movement when twisted 90 deg to the axis of rotation.
I also recall that these are not GT2 belts and so bizarre you don’t find grub-screw based gear drives and these puppies are heat pressed onto the shaft. Replacing motors, pulleys, belts and idlers the only option?