I would like to display spindle speed on screen in Mach 3. I have seen a diagram which gives all the pin outs on the 25 way connector but am currently unable to find it. I expect I need to inset a breakout in the 25 way cable that goes to the Sherline controller to access the necessary circuits.

Dos anyone know of a prebuilt solution which would allow me to input spindle speed from an optical sensor ie pulse per revolution, and even possibly output speed and direction of spindle control signals?

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