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auto tracker
An equatorial table is probably what you are looking at. We made one for our 8 inch dob, uses in line skate wheels for the bearings and with a 8mm threaded rod, jaycar motor and planetary gear and worm drive set works very well with 3 volt battery, and sometimes variable potentiometer. Plans are on the web, not too hard to make especially if someone is good at woodwork, cheap, probably under $100 all up.
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