 | | RE: Discontinuous motion. —Wittig, Bill
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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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| | | | | Re: Discontinuous motion. —John Barnes
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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 (...) (23 years ago, 2-Apr-02, to lugnet.robotics)
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| | | | | | | Re: Discontinuous motion. —Steve Baker
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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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| | | | | Re: Discontinuous motion. —Chris Daniel
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| | | | | Bill, 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 (...) (23 years ago, 2-Apr-02, to lugnet.robotics)
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| | | | | | | Re: Discontinuous motion. —Steve Baker
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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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| | | | | | | | Re: Discontinuous motion. —Kevin L. Clague
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| | | | | | "Steve Baker" <lego-robotics@crynwr.com> wrote in message news:3CAA6B95.CB1986...ail.net... (...) (A) (...) you (...) rotating (...) You can do this without modifying any gears. To approximate a gear with teeth missing, all you need to do is have (...) (23 years ago, 3-Apr-02, to lugnet.robotics)
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| | | | | | | | Re: Discontinuous motion. —Steve Baker
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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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| | | | | | | | Re: Discontinuous motion. —Jona
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| | | | | | | Nice work! Could you potentially use a ratchet mechanism or maybe a step motor set up (with a rubber band) to help with the "coating" problem? Jona ----- Original Message ----- From: "Steve Baker" <sjbaker1@airmail.net> To: "Kevin L. Clague" (...) (23 years ago, 4-Apr-02, to lugnet.robotics)
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| | | | | | | | Re: Discontinuous motion. —Kevin L. Clague
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| | | | | | Steve, If the precision is due to the axe slipping while not being driven, you could consider using a pully off a micro-motor. It has a friction slip mechanism at one end, and an axle hole at the other. You could use the axle hole to stablize the (...) (23 years ago, 4-Apr-02, to lugnet.robotics)
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| | | | | | | | Re: Discontinuous motion. —John Barnes
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| | | | | | I've uploaded a simple detent mechanism which can be used to stop shafts creeping round when they're not supposed to. The only drawback is it can get rather noisy :) (URL) black shape at the top is supposed to represent an official Lego rubber band. (...) (23 years ago, 4-Apr-02, to lugnet.robotics)
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| | | | | | | | Re: Discontinuous motion. —Brian B. Alano
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| | | | | | | I combined Robert Munafo's stepper motor ((URL) and Rob Limbaugh's partial rotation ((URL) to get a working prototype of a base 5 odometer. Hope to post a pic tomorrow. (...) (23 years ago, 5-Apr-02, to lugnet.robotics)
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| | | | | | | | | Re: Discontinuous motion. —Brian B. Alano
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| | | | | | | | (...) (23 years ago, 5-Apr-02, to lugnet.robotics)
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| | | | | | | | Re: Discontinuous motion. - Geneva-like mechanism —Philippe Hurbain
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| | | | | | I too used a detent mechanism to stabilize this Geneva-like system as I couldn't find a way to achieve the original interlock. Photos and movie at (URL)I've uploaded a simple detent mechanism which can be used to stop shafts (...) (23 years ago, 5-Apr-02, to lugnet.robotics)
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| | | | | Re: Discontinuous motion. —Steve Baker
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| | | | | (...) Yes - pretty good stuff. So it looks like I need to find an 'interpretation' of that Geneva Escapement in Lego. (Yikes!) ---...--- Steve Baker ---...--- Mail : <sjbaker1@airmail.net> WorkMail: <sjbaker@link.com> URLs : (8 URLs) (23 years ago, 3-Apr-02, to lugnet.robotics)
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| | | | | Re: Discontinuous motion. —Eric Sophie
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| | | | Wow a Geneva Mechanism, very impressive! Man o Man! That is just wild. Legomaster www.mylegomaster.com (23 years ago, 4-Apr-02, to lugnet.robotics)
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