Watch out if you are using the original spindle speed controller and want to run it from Mach 3. Its 0-10v input is not isolated from the mains, so a BoB with a ground referenced 0-10v output can't be connected without blowing something up. You will need an isolating buffer, there are a couple of circuits around that takes the PWM speed control through an opto isolator and smooth it to produce the dc signal. There is a thread somewhere on this forum I think, or maybe on cnczone.


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