Where most CNC mills mount the spindle vertically, [Paul] tilted the whole thing 90 degrees so the spindle lies on its side. Moving it back and forth on a pair of CD drive mechanisms is far easier ...
With a few certain motors, this allows for closed loop control of the spindle; Sending S4000 Gcode to the mill will spin the spindle at 4000 RPM, and S6000 runs the spindle at 6000 RPM ...
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