I just got a low cost cnc controller/driver in from Ebay.

This had X,Y,Z and C axis.
*Voltage Selection:
12-16V DC power supply for Nema 17 stepper motors
16-24V DC power supply for Nema 23 stepper motors
24-36V DC power supply for Nema 34 stepper motors
(High voltage will burn up the chips or stepper motors!!!)

I set up all setting to Mach3 and before I conected any step motor. I found that one of the 6560 drivers was bad. It was pulling over 3A load.

I ended up removing this bad driver, and order another one.

As for the cnc controller, everything else is working great.

As for the 3A output for each step motor, I would use less then 2A just to be safe.

This controller is very simple in design, it use a full closed-type optical isolation to protect the user's computer and equipment.

This is one great thing about this controller, even if it breaks down.

Parts are cheap to repair, and simple to find.

One way to design a good cnc controller, is reverse engineer one already made!

Tom