Motion Control drivers and motors

[bruce_miranda]

I've been converting a Super X1 micro mill in the UK to CNC and have run into a few problems.

I'm using Motion Control Stepper Motors and Drivers and Mach3 to run them but am not getting smooth running of the motors at all.

I have a 40V 10A PSU and the Motors are wired as Bipolar Parallel to the Drivers.

Motors being used http://www.motioncontrolproducts.co....TH76-2808B.pdf

Drivers being used
http://www.motioncontrolproducts.com...0datasheet.pdf

Driver is currently set as 2 Microsteps.

This is how it moves and sounds and although I'm not an expert at all that metal grinding doesn't sound right

http://www.youtube.com/watch?v=yzgFNBwLoCk

Driver is set to 4.2A and 2 Microstep.
Mach3 is set as 80 Step per mm.
Velocity and Acceleration are set as 2500.