Subject:
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Re: Worm gear... whence the length?
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Newsgroups:
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lugnet.robotics
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Date:
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Sun, 20 Jul 2008 00:37:59 GMT
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Viewed:
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7747 times
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In lugnet.events.brickworld, Didier Enjary wrote:
> The number of thread has to be an integer. If not, you could
> not been able to use multiple worm gear on a same axle.
True, with the caveat that the LEGO worm gear has only a single thread. Another
way of putting it is that if you want to multiply align (stack) worm gears, the
number of times the thread goes around the worm gear has to be an integer (or
since the LEGO axle has four-fold symmetry, it really has to be an integer
multiple of 1/4th).
> And the thread pitch is determined from the straight gears
> pitch. (which is something like nPi/m studs (n,m being intergers).
>
> And you can't make a multiple of nPi/m be exactly an integer of studs.
Ah, very good point. So I guess the design trade-off was either a worm gear that
was stackable but not quite an integer LEGO length, or a worm gear where the
slop would be in the meshing of a worm with a gear of a subtly different pitch.
Yes, given those options I'm glad of the none-integer length of the worm gear.
Thanks, I feel better now :)
--
Brian Davis
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