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 22:11:58 GMT
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Viewed:
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3728 times
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In lugnet.technic, Joe Strout wrote:
> 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 that the tip
> traces out an oval or elliptical path. But using only standard technic parts,
> I'm stumped. Gears and wheels obviously move in perfect circles, as do anything
> attached to a cam at a fixed point. An arm attached to a gear and a pivot point
> sweeps out a circular arc. And a piston attached to either of those moves in a
> straight line, back and forth.
>
> And that's it, that's all I could come up with. In custom machines, other paths
> are often created by attachment to non-circular cams, such that the radius of
> the attachment point to the rotation point varies as it turns. But I don't see
> any way to do that with standard lego parts.
>
> Any ideas? Or is this just a limitation we live with?
>
> Thanks,
> - Joe
In a stange tie in, I remember seeing a elliptical lathe on an episode of the
New Yankee Workshop (a PBS woodworking show). A quick google search turned (no
pun intended) up the following:
http://www.elliptical-turning-association.co.uk/html/ellipsograph.htm
-Orion
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Message is in Reply To:
 | | How to get non-circular movements?
|
| 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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