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HalfMooner
Dingaling

Philippines
15831 Posts

Posted - 06/20/2006 :  18:22:00   [Permalink]  Show Profile Send HalfMooner a Private Message
My own project addresses the disadvantage of solar power -- that it only works in the daytime. My Lunar Panels will revolutionize the future!


Biology is just physics that has begun to smell bad.” —HalfMooner
Here's a link to Moonscape News, and one to its Archive.
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Dr. Mabuse
Septic Fiend

Sweden
9677 Posts

Posted - 06/20/2006 :  19:52:51   [Permalink]  Show Profile  Send Dr. Mabuse an ICQ Message Send Dr. Mabuse a Private Message
quote:
Originally posted by H. Humbert
Send a small current through the sheathing, and the magnets would draw toward one another, contracting the sheathing. Kill the current to relax them. Voila, an artificial muscle fiber!

The magnetic field strength is proportional to the current. For an electro-magnet to become strong you need high current.

Dr. Mabuse - "When the going gets tough, the tough get Duct-tape..."
Dr. Mabuse whisper.mp3

"Equivocation is not just a job, for a creationist it's a way of life..." Dr. Mabuse

Support American Troops in Iraq:
Send them unarmed civilians for target practice..
Collateralmurder.
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H. Humbert
SFN Die Hard

USA
4574 Posts

Posted - 06/20/2006 :  19:57:48   [Permalink]  Show Profile Send H. Humbert a Private Message
quote:
Originally posted by Dr. Mabuse
The magnetic field strength is proportional to the current. For an electro-magnet to become strong you need high current.

Yeah, I was thinking that might be a way to control the tightness of the muscles. Slowly ramp up the current to draw the magnets closer together as they become more powerful. Of course, the amount of power needed would depend on somehow calculating the additional weight of what the muscle was lifting in addition to flexing itself.

Obviously it was an ill-formed idea.


"A man is his own easiest dupe, for what he wishes to be true he generally believes to be true." --Demosthenes

"The first principle is that you must not fool yourself - and you are the easiest person to fool." --Richard P. Feynman

"Face facts with dignity." --found inside a fortune cookie
Edited by - H. Humbert on 06/20/2006 19:58:24
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GeeMack
SFN Regular

USA
1093 Posts

Posted - 06/20/2006 :  20:01:32   [Permalink]  Show Profile Send GeeMack a Private Message
My most common use for magnets actually is for doing magic tricks. I've used magnets in widely varying strengths and sizes. The smallest are a fraction of a millimeter thick, and can literally be embedded between the paper layers of a playing card. The largest are huge, weigh several pounds, and create such a powerful field they can actually cause steel nails, keys, pens, etc. to stand on end.

The largest ones I've played with can be dangerous to handle, capable of smashing fingers which might accidentally get caught between the magnet and an iron surface. And you can immediately and permanently damage computer monitors or magnetic storage devices from several inches away with these monsters.

Here's my usual supplier... Super Magnet Man.
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woolytoad
Skeptic Friend

313 Posts

Posted - 06/20/2006 :  21:19:01   [Permalink]  Show Profile Send woolytoad a Private Message
Forget the about the current, the arrangement of magnets would never work. There would be similar poles next to each other (for multiple parallel fibres) that would repel when the current is turned on.
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H. Humbert
SFN Die Hard

USA
4574 Posts

Posted - 06/20/2006 :  21:26:24   [Permalink]  Show Profile Send H. Humbert a Private Message
So it seems really the only issues preventing my idea from working as I imagine is that it requires several materials which haven't been invented yet with properties that defy known physical laws.

But besides that does anyone see a problem?

Or how would you go about building a muscle? I mean, nature did it somehow.


"A man is his own easiest dupe, for what he wishes to be true he generally believes to be true." --Demosthenes

"The first principle is that you must not fool yourself - and you are the easiest person to fool." --Richard P. Feynman

"Face facts with dignity." --found inside a fortune cookie
Edited by - H. Humbert on 06/20/2006 21:29:20
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woolytoad
Skeptic Friend

313 Posts

Posted - 06/20/2006 :  22:14:46   [Permalink]  Show Profile Send woolytoad a Private Message
You're a bit behind HH. http://www.cnn.com/2003/TECH/ptech/10/09/popsci.muscle.man/ Research forthis has been going on for years. I remember an article in SciAm from when I had a paper subscription (I am thinking of getting an electronic one).
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ktesibios
SFN Regular

USA
505 Posts

Posted - 06/27/2006 :  14:32:58   [Permalink]  Show Profile Send ktesibios a Private Message
quote:
Originally posted by Dr. Mabuse

quote:
Originally posted by H. Humbert
Send a small current through the sheathing, and the magnets would draw toward one another, contracting the sheathing. Kill the current to relax them. Voila, an artificial muscle fiber!

The magnetic field strength is proportional to the current. For an electro-magnet to become strong you need high current.



Proportional to the product of the current and the number of turns in the coil, actually. One ampere through a ten-turn coil will produce the same magnetomotive force as 1/10 ampere through a 100 turn coil.

Of course, adding more turns to the coil means increasing the length of the wire, and therefore its resistance, proportionally.

"The Republican agenda is to turn the United States into a third-world shithole." -P.Z.Myers
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