The replacement Stepper Driver arrived yesterday so I am back to 4 axis again :-) . Found one on ebay.

I do notice that the stepper motor (used on the A axis rotary) is very notchy at low feed rate, even to the point where it does not make a 360 degree revolution, say at G1 F2000 but at G1 F4000 it is fine. Is this down to the poor torque of the stepper or could it be just some tightness in the A Axis unit somewhere. There are a number of dip switches on the TX14207 anyone got any further info into what these do?