I have a Grizzly G0704 that was converted to CNC by a reputable shop and I am having some issues with it. I am running Mach3 that has the spindle control integrated into it. My problem is that my DC motor speed control keeps burning up. I get about 5 hours of CNC machine run time and then like clock work my spindle just starts spinning out of control and because I have delt with this several times already I know that my board is shot again. My question is what board are you guys using so that I can buy one that won't burn up all the time. Having to sit here down again is getting frustrating.