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Re: Pivoting Arm
Make a plate with a spindle in the center for the anchor.
Then make a circular disc upon which to mount the arm. Either fix a large sprocket centrally to it or make the edge of the disk toothed. The central axis of the disc should have some sort of bearing and collar and you probably want either a slippery surface material or rollers on the contact face.
Mount a drive motor such as a van door motor horizontally with an appropriate sprocket and let the chain turn the base disc. Install some sort of limit switches on the mechanism so you don't unscrew all your wiring
Voila. been there-done that
Good luck
WC
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