What motor can rotate up to 50lbs at variable speed?

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famoussweet
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I am looking for a type of motor that can rotate gears and a large object and only rotate once every 12 hrs. I am having a hard time located one.
 
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Any motor should work. The gear assembly is complex however. What your looking for is a turret clock.
 
1) Define "large object".
2) Shall we assume it rotates continuously, making one complete revolution in twelve hours?
 
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