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The very short version of a very long story, is this would be part of an experiment that tests human reaction speed (and the improvement thereof) Think of the motion like that of a very padded, very light baseball bat swinging towards a stationary human. He or she would ideally be bringing his or her hand up to block the swinging motion before it makes contact with the torso. The speed of the swinging arc would have to be programmable.
Arm turning in bearings, large spring to load the force into (by motor if need be), strong solenoid to release (use something like the lock on a cross bow to get wear and a tell tale sound down), use friction plates with silicone grease of the kind used in broadcasting size tripods and make the interdistance adjustable within a short span to go from 180° in a very long time to 180° in a blink of an eye.
Hello!.. Imagine I'd like a component that swings a jointless "arm" (say, a 3' piece of PVC piping) 180 degrees. Think of it like a baseball bat. I'd like it to:- Swing exactly 180 degrees and return to its original position.- Be able to do so with programmable/variable speed...from a 2 second journey to a very fast, almost immediate journey.- Be able to withstand conflicting force without damage. For example, if it swings around 160 degrees and is stopped.