Hot answers tagged mechanical
You can use a large gear (3649) with connector pegs (970607) attached like this: Then you can attach the 6x6 plate on top.
Would this solve your problem? Depending on the direction of the input, only one axle will turn.
There's actually a specialized part to accomplish this task. Take a look at the Technic Turntable (2855): This part can be used to create sturdy rotating platforms that can be controlled by gears. It consists of two parts (2855 and 2856) that snap together to allow for smooth rotation about the center. Here's an example from the classic Mobile Crane set: ...
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