I have seen dob's with motors.

But I put my dob on an equatorial platform, for tracking.

But I used it for years just tracking objects manually. You want your scope set up so that the amount of friction in azimuth is about the same as the friction in altitude, and so that there is no stiction and no drifting.

Works really well once you get used to it.

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"I'm as accurate as any psychic. And I'm a cartoon!" -- Squidward

"Arrrgh, the laws of physics be a harsh mistress!" -- Bender