Quote:
Originally Posted by Ether
If you decide to go with limit switches, make sure to mount them in such a way that they don't also serve as a hard stop.
Common mistake.
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Agreed. I have seen many smashed/mangled limit switches. This can be a huge issue, especially if the arm is moving fast. Locate the switch trip point about a half inch before the hard stop, such that when at the hard stop the switch is still tripped.
One way to make the "switch" more robust from damage with fast moving arms is to use a hall effect sensor like
http://www.andymark.com/Electrical-p/am-3313.htm an put a small magnet on the arm.