 | | Re: Grade Crossing Signal Thingy... —Joe Strout
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| | | I have a couple of newbie questions about things like this. First, how do you protect the motor? In this particular design it looks like you could actually rotate the arm past vertical, which I guess isn't a problem until you hit the ground on the (...) (20 years ago, 17-Dec-04, to lugnet.trains)
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| | | | | Re: Grade Crossing Signal Thingy... —Larry Pieniazek
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| | | | | (...) One approach is to use a linkage mechanism in which the gate is driven by a link that no matter how the motor rotates, never takes the gate below horizontal or beyond directly vertical. That of course introduces other issues, such as knowing (...) (20 years ago, 17-Dec-04, to lugnet.trains)
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| | | | | Re: Grade Crossing Signal Thingy... —Ross Crawford
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| | | | | (...) Easiest way is to have a stop of some kind at both extremeties of movement, and introduce some kind of slip into the drive mechanism, like rubber bands or a slip clutch (URL) each cycle runs the motor longer than it needs, and the clutch slips (...) (20 years ago, 17-Dec-04, to lugnet.trains)
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| | | | | | | Re: Grade Crossing Signal Thingy... —Joe Strout
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| | | | | | (...) How safe is it to routinely torque that slip clutch? I usually put it in for safety, but try not to need it -- something like a rope ladder for the upstairs bedroom. I'm thinking of a situation where a four-year old (and possibly several of (...) (20 years ago, 18-Dec-04, to lugnet.trains)
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| | | | | | | | Re: Grade Crossing Signal Thingy... —Ross Crawford
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| | | | | | (...) I don't know, I've never tested it under such duress. I don't imagine it would damage the motor at all, but it may damage the clutch after prolonged use. (...) I've found the easiest way is with rubber bands, and though it is usually a little (...) (20 years ago, 19-Dec-04, to lugnet.trains)
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| | | | | Re: Grade Crossing Signal Thingy... —Stefan Garcia
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| | | | (...) The way that my design ended up, that isn't an issue. The arm just goes up and down as the wheel/motor rotates. It doesn't go past horizontal or vertical positions (by luck, not design :^) ) (...) There's a weak spot in my signals above the (...) (20 years ago, 18-Dec-04, to lugnet.trains)
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| | | | | | Re: Grade Crossing Signal Thingy... —Larry Pieniazek
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| | | | (...) Try braking. This is from memory so might be all wet... If you just turn power off, the motor coasts to a stop. But supposedly you can send the motor a speed 0 command, I think, and the motor stops right then, frozen in place. It takes more (...) (20 years ago, 18-Dec-04, to lugnet.trains)
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