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Re: Robust way to rotate an 18 inch square plate 90 degrees.
One option would be to attach the plate to a shaft and then use a motor with a large reduction to rotate the shaft, rotating the plate. Another option is to put the plate on hinges and attach spring to the end so the plate is always being pulled one direction. Then attach a rope to the end of the plate and use a winch system to pull in the rope, pulling back the springs and rotating the plate. There are plenty of other options, those are the ones that came to me off the top of my head.
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