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Re: Motor for arm: what should be used when?
We've got two RS775s running through a a ~380:1 reduction on our arm (64:1 gearbox, 6:1 sprocket). The arm has two window motors, two pistons, some 25 series chain, and a pretty serious manipulator. We simply stall the motors to hold position controlled through a PID loop, and they don't heat up much at all. They've never been more than "warm to the touch" even after minutes of holding position at horizontal. They lift the arm nice and fast, the rate is controlled in software, and using the jags' dynamic braking it coasts down nicely as well.
Two RS775s might be overkill, but they handle the stalling a lot better than any other BaneBots motors and have proven to be wonderfully robust so far.
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Maturity is knowing you were an idiot, common sense is trying to not be an idiot, wisdom is knowing that you will still be an idiot.
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