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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Wed, 3 Apr 2002 02:32:55 GMT
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Original-From:
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Steve Baker <sjbaker1@airmail.netAVOIDSPAM>
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Reply-To:
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sjbaker1@airmail.#antispam#net
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Viewed:
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1841 times
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Robert Limbaugh wrote:
> Have you tried using two wheels?
>
> Mount one wheel on an arm so that the wheel itself does not rotate. Use an
> appropriate length arm for your situation and rotate it. The wheel on the
> arm will come in contact with the 2nd wheel and spin the shaft the 2nd wheel
> is on.
Yes - that's essentially what I did when I said:
> > * I attached a 24t gear to a 40t using a couple of black pegs through
> > the holes around the edge of each wheel. This made the teeth of the
> > 24t stick out a bit beyond the 40t's radius. Turning the 40t by it's
> > center hole and meshing the 24t's teeth with a second 24t gear
> > looks like it should work quite nicely. When I turn this contraption
> > by hand, the mechanism works OK - but when I motorize it, it jams
> > every few seconds.
I used a large gear to mount the smaller one off-axis instead of the 'arm'
you describe - but functionally, it's the same. The trouble is that
during the period when the two gears are not meshed, the second wheel moves
a teeny-tiny bit and on the next revolution, there is a good chance that
they won't re-mesh. The two sets of teeth impact each other peak-to-peak
instead of peak-to-valley - which jams the mechanism and stalls the motor.
It's a shame - because it *looks* like it should work - and it does if
you rotate the input shaft slowly by hand.
----------------------------- Steve Baker -------------------------------
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