>So the big question is, why not use optical? Metal

High grease environment, little metalic debris to be concerned with.  The grease
will blind the eye too easily.

The shaft is being spun by a 3000W motor - I don't think a setscrew for the hall
sensor will put much load on it.  The fiber disk will be weighing anywhere from
2-6 ounces, so balance issues are immaterial as well.

Earlier post I had 60K RPM - should have been 35K.  I don't know where 60K came
from (probably crossover noise from another project I'm working on).

Andy

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