Subject:
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Re: Robot Arm Help - Gearing Techniques - FAQ
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 3 Feb 2003 10:19:24 GMT
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Original-From:
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PeterBalch <peterbalch@[IHateSpam]compuserve.com>
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Viewed:
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736 times
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Eric
> > What is the relative efficiency of the different gear trains? Lego gears
> The inherent gear reduction of the
> worm gear is pretty good. I use the worm gear as a "work device" or
> "business drive".....using it together with other gears to compliment the
> overall gear train. So I'm really not sure how to answer your question.
I was querying the efficiency of, for instance, a worm and a 40T (i.e. a
40:1 reduction) compared with the efficiency of a set of pinions to give
the same reduction.
Efficiency is power-out divided by power-in. A Lego worm drive is less than
50% efficient. That's why, no matter how hard you turn the 40t pinion, you
cannot get the worm to turn. A series of pinions (providing a similat 40:1
reduction) may have an efficiency greater than 50% - so you can turn the
output shaft.
Of course, efficiency varies with load.
Peter
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