Subject:
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Pawl and rachet?
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 26 Oct 2000 18:48:02 GMT
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Original-From:
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Ulfr Fenris <FENRIR@ihatespamHATI.GAPINGWOLF.COM>
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Viewed:
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671 times
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Hello everybody again -- thank you all for the respones, sorry I haven't
gotten back to some of you who emailed me privately, I've been swamped
with work. I had some great lego sets recommended to me and I'm trying to
find out where I can acquire those now.
But I do have another quick question... Has anyone created a sucessful
racheting mechanism using technic/regular lego? I'm working on a
one-motor differential drive that works akin to one I saw on Lego's website,
but is improved because instead of one wheel dragging while turning, they
both rotate in opposite directions for true turn-in-place ability.
However, I'm having some difficulty in arranging a method to make one set
of gears turn in only one direction. I've tried the hanging rachet shown
on Lego's website
(http://mindstorms.lego.com/tipstricks/build/master/differential.asp),
but it's very quirky -- it sometimes doesn't catch immediately and
therefore my wheel base rolls forward before turning. I've tried adding a
rubber band around the pawl but it produces a nasty clicking sound and
likely does wear to the gear/pawl. I've surfed around on various websites
by Lego engineers, and have seen many creative mechanisms, but so far
nothing that can help me.
Just wondering if anyone else has had this problem and managed to overcome
it. (I'll have my lego website up Real Soon Now with pics/cad files of my
designs and 'bots.)
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Message has 1 Reply:
 | | Re: Pawl and rachet?
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| Hello, I designed just such a drive, using worm gears instead of ratchets. It does, unfortunately, take a tiny amout of time to shift between moving forward and spinning in place. Perhaps it will meet your needs anyway. The relevant images are steps (...) (24 years ago, 26-Oct-00, to lugnet.robotics)
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