Why dont you just make an index mark/pointer on the headstock and chuck
This should be hand settable to less than a degree of chuck motion
then just note the motor encoder count when the chuck is aligned with the mark
and then rotate the motor until the chuck has turned say 20 turns. This should
give you the ratio to within 1/7200 which should be better than needed.
if thats not enough, just do more turns, you could get to PPM accuracy
is less time than it takes to futz with doing this is hal
Peter Wallace
Mesa Electronics
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