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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Tue, 2 Apr 2002 14:43:26 GMT
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Viewed:
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597 times
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Great reference, thanks Bill.
I had forgotten about the Geneva mechanism.
Any interest, Steve? If you'd consider filing the teeth off a gear, how
about an honest to goodness made to measure couple of Geneva mechanism parts?
JB
In lugnet.robotics, "Wittig, Bill " <bill.wittig@delphiauto.com> writes:
> Try looking at the mechanisms at =
> http://www.brockeng.com/mechanism/index.htm.
>
> I find this to be a great reference site for basic kinematics.
>
> bill
>
> -----Original Message-----
> From: Steve Baker [mailto:sjbaker1@airmail.net]
> Sent: Saturday, April 06, 2002 12:07 AM
> To: Lego Robotics
> Subject: Discontinuous motion.
>
>
>
> I'm trying to build a mechanism that converts continuous rotation on
> one axle into a periodic short rotation on another. I could imagine
> a way to do this by filing off most of the teeth from one gear wheel
> so that it would only turn an adjacent gear for a small part of it's
> revolution - but I don't want to modify any Lego parts or use non-Lego
> components.
>
> I tried a couple of things (both failed):
>
> * 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 hooked up a reciprocating rod to a 40t wheel - and mounted a rack
> plate to the rod such that it just contacts an 8t gear for a short
> part of it's cycle. This also works - and although it doesn't jam,
> it operates rather violently and tends to destroy itself in short
> order. It's also incapable of transmitting any significant amount
> of power.
>
> There must be a good way of doing this - but after an entire evening
> of tinkering, I havn't come up with anything usable.
>
> Help!
>
> ----------------------------- Steve Baker =
> -------------------------------
> Mail : <sjbaker1@airmail.net> WorkMail: <sjbaker@link.com>
> URLs : http://www.sjbaker.org
> http://plib.sf.net http://tuxaqfh.sf.net http://tuxkart.sf.net
> http://prettypoly.sf.net http://freeglut.sf.net
> http://toobular.sf.net http://lodestone.sf.net
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Message has 1 Reply:
 | | Re: Discontinuous motion.
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| (...) No - I *won't* consider hacking away at my Lego parts - however, it may be possible to take that idea and build something that would be similar. ---...--- Steve Baker ---...--- Mail : <sjbaker1@airmail.net> WorkMail: <sjbaker@link.com> URLs : (...) (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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| Try looking at the mechanisms at (URL) find this to be a great reference site for basic kinematics. bill -----Original Message----- From: Steve Baker [mailto:sjbaker1@airmail.net] Sent: Saturday, April 06, 2002 12:07 AM To: Lego Robotics Subject: (...) (23 years ago, 2-Apr-02, to lugnet.robotics)
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