Subject:
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RE: More Directional transmissions...
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 1 Dec 1999 22:54:29 GMT
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Original-From:
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Jim Thomas <JIM.THOMAS@TRWavoidspam.COM>
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Viewed:
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2092 times
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I'm not exactly sure how, but I think the white torque limiting gear might
work here...
JT
> -----Original Message-----
> From: Dave Johnson [mailto:djohnson@sirius.com]
> Sent: Wednesday, December 01, 1999 1:28 PM
> To: lego-robotics@crynwr.com
> Subject: More Directional transmissions...
>
>
> At the risk of boring folks with my mechanical tinkerings...
>
> I want to create a transmission such that drivng the input
> shaft one way
> gives me very slow rotation on the output, but driving it the
> other way
> gives me fast rotation in the opposite direction on the same
> output axle.
>
> I've got several working models, but they all have the same
> problem: in
> the slow rotation case it's fine, I have a long reducing gear
> train to
> give me very slow rotation on the output. But in the fast
> rotation case,
> the entire gear train is "back driven" by the output axle,
> and since the
> gear train from this direction is "gearing up", the load on
> the motor is
> very heavy, and there are lots of gears spinning VERY fast
> for no good
> reason.
>
> So I've been trying to come up with a way to disconnect the
> output axle
> from the gear train in that case, but the usual "gear on a swing arm"
> method can't work. In fact, it's this very principle that makes "pull
> back" motors work at all. Those who have messed with this stuff a lot
> will understand why. It was a revelation for me, I admit, but
> that's a
> big part of why this is so much fun :-)
>
> Incidentally, if the output shaft can rotate the same
> direction in both
> cases (fast and slow), I can make it work fine. But I really
> need a "fast
> reverse".
>
> So I guess the question is this: are there other ways to disconnect a
> gear train besides the swing arm? Or is there any way to connect or
> disconnect a gear based on speed of rotation? Does anyone
> have any ideas
> and/or references for this kind of thing? Does anyone even
> know what I'm
> talking about? :-)
>
> Dave Johnson
> Amateur Mindstormist
>
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