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Thanks Dave Steve & Brett for your suggestions. I like the windscreen wiper motor idea, especially as they should be cheap. Using two - spaced 180 degrees apart - to provide a couple rather than a moment, might produce smoother turning, but I suspect that I would try just one initially.
Brett, what are the pros and cons of having the positional encoder on the drive motor/gear rather than on the dome itself. The latter would surely give absolute position, but would obviously need some sort of coded scale (gray scale?) around the entire 11.3 metre circumference. I guess that if the drive system did not ever slip, it would be simpler to have it on the drive itself.
Thanks too for the link to the Lesve dome driver site. I had not heard of this one previously and note that the PCBs should be available through Jaycar.
Chris
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