Hi everyone,

New to the site and hoping someone can help with this....

Recently bought a used cnc milling machine (custom manufactured model), with a spindle problem.

Its currently running mach 3 software, I have managed to get the spindle (dc treadmill motor) running via a 5v supply motor controller board, and verified that there is a variable 0-10v output from the breakout board to a potentiometer (to harmonise the programmed speed to actual speed)

Trouble is this (electrics) isnt really my field, and was wondering if anyone could do me a schematic sketch as to how pwm wires should be connected to the pot?, the original wiring was a bit of a dogs breakfast, but included a 5k resistor and capacitor (assume as part of a smoothing circuit)

I can get the spindle to start & reverse in mdi no problem, but the only spindle speed control I have is manually via the potentiometer, and the motor seems to lack torque for some reason? (assume its lack of pwm input?)

Any help gratefully received thanks...