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Participant

Join Date: Jul 2007
Posts: 1

Rotary Limit Switches

07/06/2007 3:57 PM

I'm not clear on the restrictions to limit switches.

I require a limit switch that will trip after 0.2 revolutions, to "crack" a gate, and then 132 revolutions to fully raise the gate. I understand a 150:1 ratio would be suitable for the 132 revs, but what about the 0.2 revs?

If it takes 2 turns of the input shaft to reset the switch, does this mean that after lowering the gate, the limit switch will not trip when cracking it again? In other words, lowering from a fully raised position, will the limit switch trip 0.2 turns before closing, and then not not be be reset for the next time the gate is raised?

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Guru

Join Date: May 2006
Location: Placerville, CA (38° 45N, 120° 47'W)
Posts: 6215
Good Answers: 248
#1

Re: Rotary Limit Switches

07/07/2007 1:23 AM

One possibility would be to have the rotary motion turn a screw (threaded rod) that carries a nut-arm, converting the rotary motion to linear. Then you can place two or more ordinary microswitches or photointerrupters along the linear path and adjust each of them independently.

Dick

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