Subject:
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Muscle wire and alternatives
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 26 Mar 1999 17:36:27 GMT
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Original-From:
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Jim Choate <ravage@NOSPAMeinstein.ssz.com>
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Viewed:
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907 times
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----- Forwarded message from Joel Shafer -----
Date: Fri, 26 Mar 1999 11:12:57 -0600
From: Joel Shafer <joel@connect.net>
Subject: Re: multi-device output controller (fwd)
Has anyone tried out the Muscle Wire or electronic pistons from this site?
Seems like a good alternative to pneumatics.
----- End of forwarded message from Joel Shafer -----
You're talking about Nitinol I assume. It works ok, the major drawback is
that of metal fatique. Eventualy the wire breaks (it's still pretty
expensive I believe). There is also a considerable thermal hysterisis in that
it takes longer to relax for larger diameters than to contract.
I keep seeing that little robot-in-a-book in the book store based on this.
There has also been some work in the last few years in plastics that change
dimension, recoverably, via thermal or electrical stimulation. You could
probably find some useful links on google.com by using 'artificial plastic
muscle' though I haven't tried.
Two other plastics are useful as well. The black conductive foam that
regular chips are shipped in changes resistance due to pressure. It make
great gripper sensors for force feedback. It does wear out and is sensitive
to moisture. The conductive black plastic sheeting boards are shipped in is
sensitive to IR, just don't get it so close it melts.
____________________________________________________________________
The trouble with acting according to your conscience is that
once you start doing it, nobody can trust you any more.
Alexis A. Gilliland
The Armadillo Group ,::////;::-. James Choate
Austin, Tx /:'///// ``::>/|/ ravage@ssz.com
www.ssz.com .', |||| `/( e\ 512-451-7087
-====~~mm-'`-```-mm --'-
--------------------------------------------------------------------
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message has 1 Reply:
 | | RE: Muscle wire and alternatives
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| I have connected nitinol to Lego and it can melt the ABS plastic...be careful. Rich (URL) Message----- From: Jim Choate [mailto:ravage@EINST...N.ssz.com] Sent: Friday, March 26, 1999 11:36 AM To: lego-robotics@crynwr.com Subject: Muscle wire and (...) (25 years ago, 26-Mar-99, to lugnet.robotics)
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