Hi ! We've just had our gantry mill delivered from BZT Germany. It uses Leadshine 2278 stepper drives and has been delivered with Mach3. We've switched it on and started running through basic checks. It's not going well - all the axes seem to be really smooth in one direction but noisy and rough in the other.
The Y is even more bizarre, the roughness is such that it loses position and the axes reverses direction. This happens with the motor driving the axis or on its own. The reversal affects all movements after that.
Swapping the individual drives inside the case has not made any difference.

I'm new to all this, so please excuse any lack of background info !

Tim