Subject:
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Re: Grade Crossing Signal Thingy...
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Newsgroups:
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lugnet.trains
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Date:
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Sat, 18 Dec 2004 19:32:42 GMT
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Viewed:
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1742 times
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In lugnet.trains, Ross Crawford wrote:
> 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 http://www.peeron.com/inv/parts/60c01
>
> Then each cycle runs the motor longer than it needs, and the clutch slips when
> the bar reaches the stop.
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 his
friends) might be leaning on the power button -- or even, click it into the "on"
position and not quickly realize how to shut it off. Will the slip clutch keep
the motor safe even if this happens frequently? Or, will it heat up/wear
out/otherwise repay my abuse?
I've worked out a mechanical limit-stop mechanism that I feel confident in, but
it's bulky. If my fear of relying on the slip clutch is nothing but
superstition, then I could make my module quite a bit smaller.
Thanks,
- Joe
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Message has 1 Reply:
 | | Re: Grade Crossing Signal Thingy...
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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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Message is in Reply To:
| | Re: Grade Crossing Signal Thingy...
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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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