Subject:
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Re: How to get non-circular movements?
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Newsgroups:
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lugnet.technic
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Date:
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Mon, 23 Aug 2004 17:04:10 GMT
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Viewed:
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3704 times
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In lugnet.technic, Joe Strout wrote:
> Short question: how can I... make a motor-driven part that...
> traces out an oval or elliptical path.
Have an arm attached off-center on a gear, running through a fixed pivot
point (that is free to rotate!). As the main gear rotates, the distance between
the driven end of the arm and the pivot point changes as the off-center
attatchment point moves closer and further from the fixed pivot. Rebuild with
the pivot point a different distance from the center of the gear, and you get
various ovals, long & thin or short & wide. This technique is often used for
turning multi-legged walkers, for instance.
> Any ideas? Or is this just a limitation we live with?
This is Technic - there are no limits, just challenges <grin>. Take a look at
this thread from a few years ago:
http://news.lugnet.com/technic/?n=6029&t=i&v=a
And in particular, on of the embedded links:
http://www.brockeng.com/mechanism/index.htm
amazing array of devices - many of which (including the Geneva wheel!) have been
reproduced in LEGO.
--
Brian Davis
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Message has 1 Reply:
 | | Re: How to get non-circular movements?
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| (...) Ah, I see. The pivot point must be free to slide on the arm (er, vice versa) as well. I think that's the key bit I was missing last night. (...) devices in my Technic models. Best, - Joe (20 years ago, 23-Aug-04, to lugnet.technic)
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Message is in Reply To:
| | How to get non-circular movements?
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| Short question: how can I combine technic gears, arms, cams, etc. to make a motor-driven part that does not move in either a straight line, a circle, or an arc (i.e. part of a circle)? Long question: I'm trying to figure out how to drive an arm so (...) (20 years ago, 23-Aug-04, to lugnet.technic)
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