If you don't need a huge tooth count, why not just put hall sensors on the
backgear (of any lathe so equiped.) You should be able to adjust a pair of
them to give good quadrature. Should be able to come up w/ a creative way
to do the index pulse too? Like sense a keyway, drll and tap the side of a
gear for a small bolt head, or even glue on a little tab.
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