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Cripes, Gary, thanks.
The reason for my asking is a mate has his azimuth bearing made out of a lazy susan. I've thought of fitting an encoder's shaft with a little wheel, and set the wheel to run parallel to the tangent of the pivot point. Depending on the distance out from the centre of the pivot, the effective number of encoder revolutions can be quite large.
No backlash with this direct drive method either.
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