System and method for rotational position tracking of brake lathe adjustment assembly

An on-car brake lathe system for resurfacing a brake rotor of a vehicle brake assembly, the brake lathe system having an output spindle, said output spindle adapted for coupling to a vehicle wheel hub and rotationally driven about a drive axis, comprising:

• an aligning joint associated with the output spindle, said aligning joint including a plurality of slant surfaces inclined at an angle relative to an axis of said aligning joint, at least one of said slant surfaces being rotationally adjustable relative to the other, whereby an orientation of said output spindle relative to the vehicle wheel hub is determined by relative rotational positions of each of said slant surfaces;
• a means for determining a current rotational position of each of said plurality of slant surfaces within said aligning joint;
• an actuation mechanism for selectively altering said relative rotational positions of said slant surfaces;
• and
• a control system configured to determine a relative rotation between said plurality of slant surfaces from said current rotational positions to selectively activate said actuation mechanism to adjust said output spindle relative orientation.