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 16:59:25 GMT
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Viewed:
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724 times
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"Steve Baker" <lego-robotics@crynwr.com> wrote in message
news:3CAA6B95.CB198643@airmail.net...
> Chris Daniel wrote:
>
> > This exact same question was posted several months ago but I don't
> > remember the sollution that they came to. This is my Idea:
> >
> > Ok you take two pulleys, pulley (A) is smaller then pulley (B).
> > You then conect the 2 pulleys via a linkage so that when you turn pulley • (A)
> > pulley (B) continuosly changes directions.
> >
> > Now you take this two way motion and convert it back to one way and • you
> > have your desired effect.
>
> Thanks - but that's not what I'm after. I want the input shaft to be • rotating
> continuously - and the output shaft to be stationary for some relatively
> large amount of time - then suddenly rotate for a short time. This cycle
> should be repeated. What your mechanism does is to make the output shaft
> rotate all the time - but switching directions periodically.
>
> Imagine what you'd get if you meshed two 40t gears - then filed off (say)
> 36 of the teeth from the 'input' gear. Then the input shaft could rotate
> continuously - but the output shaft would only rotate for the 10% of the
> revolution when the remaining teeth are meshed.
You can do this without modifying any gears.
To approximate a gear with teeth missing, all you need to do is have
the axle that drives the gear offset from the center of the gear.
For example on a 40T gear, just use one of the axle holes that is
not in the center of the gear.
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Message has 1 Reply:
 | | Re: Discontinuous motion.
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| (...) I've tried that - it jams periodically when the teeth of one wheel meet point-to-point against the teeth of the wheel it's driving. This seems to be because of the strange angle at which the first wheel approaches the second at it initially (...) (23 years ago, 3-Apr-02, to lugnet.robotics)
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Message is in Reply To:
| | Re: Discontinuous motion.
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| (...) Thanks - but that's not what I'm after. I want the input shaft to be rotating continuously - and the output shaft to be stationary for some relatively large amount of time - then suddenly rotate for a short time. This cycle should be repeated. (...) (23 years ago, 3-Apr-02, to lugnet.robotics)
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