Just taken some motor current measurements on my machine - measured at the output of the star-wired PSU:

- Powered up but stationary the 3 drivers and motors together pull 0.87A (DC) total. Motors bipolar series. Driver PM542 settings now 2A (RMS) limited.
- MACH3 jogging X,Y or Z axis individually pulls 1.36A during acceleration levelling at 1.25A - this is the machine's full MACH3 limited speed of 400mm/min.

Jogging in, say, X and then also jogging Y - ie causing the horrible mechanical noises and poor movement - pulls 1.6A to 1.9A total.

Jogging the Z full speed and then - at the same time - jogging either the X or Y in any direction does not cause any problem (likewise moving either X or Y and then engaging Z causes no problem).

My PSU is rated at (43V) 5+ amps so, given the figures above, current does not seemed to be an issue.

I'm wondering if this problem is due to inertia/momentum/twisting forces in the, not very expensive, X-Y table?