Subject:
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Re: Discontinuous motion.
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 4 Apr 2002 02:32:06 GMT
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Viewed:
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458 times
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Steve,
Here's an "all gear" based solution (minus the chain I used from the drive
shaft):
http://www.abs-robotics.com/locomotion/partialrotation.htm
I'm not sure how much gear lash is in the design I came up with, but the
thing runs very well (much better than I thought it would).
It's been quite some time since I've torn apart a dashboard, but I do
believe an analog odometer uses gearing. If I recall correctly, the
"snapping" action was because of spring loading to force the digits to stay
in a detent position...I think that's also part of the ratcheting mechanism
to prevent "rolling back" mileage... my memory regarding how they work is
vague and my only experience was dismantling one that didn't work properly
from a 76 Buick I used to have.
Anyway, hope this is helpful!
Rob
In lugnet.robotics, sjbaker1@airmail.net writes:
> Robert Limbaugh wrote:
> >
> > I meant using wheels with rubber treads. Rubber treads won't have a meshing
> > problem. Instead of the problem being gear mesh, the new problem should be
> > speed vs. friction.
>
> OH! I see! Very clever.
<snipped car odometer stuff...>
>
> So, your suggestion certainly does do what I actually asked for - but it's
> not accurate enough for what I actually *want*. If the system doesn't use
> some kind of solid gear-based mechanism, it'll gradually accumulate error
> which will be hopeless for what I ultimately want to do.
>
> > If the drive wheel arm rotates to quickly, the drive wheel may not grip the
> > 2nd wheel enough. Or, it may grip too well and make the 2nd wheel spin more
> > than desired (depending on the load on it's axel).
>
> Yes - that problem exists with the gearwheel solution too.
>
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Message is in Reply To:
 | | Re: Discontinuous motion.
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| (...) OH! I see! Very clever. I guess I should explain why I wanted this thing in the first place. All the talk last week about building a Turing machine using Lego - and building primitive mechanical computers in general led me to try to build a (...) (22 years ago, 3-Apr-02, to lugnet.robotics)
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