
17-01-2017, 11:58
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Registered User
 FRC #5523
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Join Date: Jan 2015
Location: Grass Lake, MI
Posts: 81
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Re: Robust way to rotate an 18 inch square plate 90 degrees.
Quote:
Originally Posted by GeeTwo
This sounds like a good job for a light pneumatics. If you need intermediate positions, look into a heavy duty servo or light motor (e.g. some flavor of PG) with sensor feedback.
The FIRST servo rules have relaxed significantly in 2017 (after a significant relaxation in 2016), so you may want to re evaluate the compliance yourself. IIRC, the only servo specific requirements this year apart from how you power and control it (R36) are that it have a retail value under $75 (R32).
Edit: When setting up pneumatics, you should make sure that your mounting gives you good leverage at your angles of greatest load. For lifting a plate/box around a horizontal hinge, the cylinder should be pushing (or, less optimally pulling) just about straight up at the bottom of the stroke, but can be at a relatively shallow angle (e.g. 30 degrees) at the top of the stroke, because the CoG isn't rising very much there. Going the other way will require a much larger cylinder that will slam the plate to the top of the travel because it is overpowered there.
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Thanks, I can see your suggestions. They make good sense.
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