Subject:
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Re: Strong gear assemble?
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 22 Sep 2000 19:05:19 GMT
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Viewed:
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880 times
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According to "The Art of LEGO Design" a worm gear is
best used at high-speed, low-torque points in the drive
train. In other words, drive the worm from the motor,
then do any further gearing... Unless your normal gear
train is trading torque for speed, in which case you are
probably better off putting it in between the motor and
the worm.
-Peter
"Jennifer Clark" <jen@vulture.dmem.strath.ac.uk> wrote in message
news:39CB5959.B04B2818@vulture.dmem.strath.ac.uk...
> Jason Stern wrote:
>
> > Same when it goes back down. I do need to add one
> > more worm gear, right now it lifts everything but the rcx (very close • though),
> > so it needs a little more torque.
>
> A word of caution - the worm gears are certainly great for large gear • reductions in
> small spaces, and it is usually easy to brace them well, but they have one
> disadvantage over a traditional gear train - they create more friction, • and are
> therefore less efficient in this regard. If all you need is just a little • more
> torque, you may be better off using, say, an 8 tooth into a 24 tooth gear • for a 1:3
> reduction instead of another worm screw.
>
> Any thoughts on whether a normal gear train should be placed before or • after the
> worm screw? Intuition tells me that it would be best before, so that the • worm screw
> would be spinning more slowly, and therefore subject to less friction. On • the other
> hand, the torque put on the worm screw by the load and motor in this • situation
> would be greater, which could in turn create more friction. All this • assumes that
> you have the choice of fitting the gears in the model in either • combination, of
> course.
>
> Jennifer Clark
>
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Message is in Reply To:
 | | Re: Strong gear assemble?
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| (...) A word of caution - the worm gears are certainly great for large gear reductions in small spaces, and it is usually easy to brace them well, but they have one disadvantage over a traditional gear train - they create more friction, and are (...) (25 years ago, 22-Sep-00, to lugnet.robotics)
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