How to perform motor turing for a rotary axis?

[CitizenOfDreams]

And then the steps per rev for the chuck pulley would be 7500.
So how do I accurately step the A axis by 7500 steps?

You tell it to move 360 degrees, and Mach3 will convert it to 360*20.83(3)=7500 steps.

[ger21]

Use MDI and type G91 G0 A360