Wow, it gets deeper!
It is NOT the encoder, or anything in the encoder-reading
process.
I marked the motor shaft, and the motor is returning to the
exact same position every cycle.
Well, I tried a different indicator and mount, and the
problem was in the indicator mount! I was using an old
knock-off of an IndiCol that clamps around the spindle nose
or end mill holder and has several rods with locking
thumbnuts on them. These swivel joints were slipping just a
tiny bit each time the vise touched the indicator, even
though they were PRETTY tight! Ugh, 3 days of going around
in circles trying to tell where the issue was!
Jon
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