sorry I didn't get back yesterday but here is what we have. the spindle we bought was from pennybuying.com it was an A514A the number on the motor is HXKJ-GS52-300W. It is a 300W 12 V, 24V, 36V, 48V DC. spindle motor. the driver interface is a 12V 24V 48V 110V DC Motor Speed Driver Controller PWM MACH3 Spindle Governor. Our electronics engineer set it up to be able to run the motor either buy Mach using the PWM on ouput 14 or manually on outpu16 with a switch and speed control dial on the machine.