Using a Pokey57 CNC and Mach 4 can you tell me how to connect my laser. The laser has three wires.. Ground - 12V Power and PMW.

Do you have a TL or a TH for triggering the laser? If you power the digital side of your laser power supply with 12V and tie the gnd with the PWM gnd on the pokeys57CNC controller, you may be able to use the PWM on the pokeys57CNC controller. Before you do this, I would suggest that you contact polabs support (http://support.polabs.com/) and ask them if this is possible.