I am contemplating my first manual to CNC lathe conversion.
I more or less understand the requirements for basic X & Y axis motion, however, I have not figured out what needs to be done to cut threads on a lathe.
I suspect that the spindle needs some kind of rotation sensor, but would that be simply to sense RPM or would it need to be more along the lines of a full rotary encoder of some type, so that MACH3 knows the exact rotational position.
Can this be achieved without getting into the initial extra expense of a motion controller.
Yes some sort of angular velocity sensing is required for the spindle.
The sensor needn't be anything complicated. Position an infra-red LED and detector either side of a disk with slot(s) in it attached to the spindle, and wire it up to one of the inputs on your controller.
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