Z axis playing silly buggers

[Doddy]

Now it will jog up and down or just buzz at random. Jog direction is random.

Does this sound like a fried driver ?

Tomorrow, when I have cooled down a bit, I will swap over the drivers in the control box and see if the problem moves around with the driver.

Rob

Cooling down is always a good idea.

The bit that interests me is the random direction, and/or buzzing - I had this a couple of weeks ago with an axis on a 3d-printer. Turned out a core in the lead between driver and stepper had failed, so only a single coil was energising, you could coerce the motor to move in either direction with a bit of finger pressure.

In your case, could be driver, cable or stepper. I'd agree : check by substitution.


Curious bit: What caused the Z traverse in the first place?, it's not an obvious single point of failure with the resultant loss of Z control.