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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Tue, 24 Aug 2004 22:45:37 GMT
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Viewed:
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3767 times
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In lugnet.technic, Orion Pobursky wrote:
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In lugnet.technic, Joe Strout wrote:
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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 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
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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
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Note that an “almost elliptical” path can be traced by a much simpler mechanism,
as used in the legs of the I have reproduced a basic version:
ROSCO
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Message is in Reply To:
 | | Re: How to get non-circular movements?
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| (...) 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: (URL) (20 years ago, 23-Aug-04, to lugnet.technic)
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