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'[OT] What are Spherical Magnets Used For?'
2009\03\04@112112 by Martin McCormick

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       I recently got my hands on some spherical magnets as
sold in a surplus parts catalog. There are several sizes and
they look like ball bearings except for the fact that they are
tremendously magnetic. Even the little 1-8 inch balls are
difficult to separate from one another. The half-inch magnetic
balls will put a pretty painful pinch on your fingers if you get
any skin caught between them.

       I am curious as to what they might have been meant to do
in whatever application they were planned for before they became
industrial surplus.

       The material is described as iodinium.

       Some of the things I thought about are as tilt sensor
elements, possibly surrounded by Hall-effect devices.

       Another possibility is some sort of stirring device such
as a paint mixer in which the ball is put in to a container that
is non-magnetic and then an electro magnet on the outside is fed
with AC to cause the ball to dance around.

       Of course, one can do dumb things such as put one on a
wooden or plastic table top and make it roll around by holding
another under it.

       As I said, they are really stout magnets so they must be
handled with some caution as they would probably be very
difficult to get out of any holes they might fall in to. They
would also do a real number on any mag stripe cards or floppy
disks they encountered.

Martin McCormick WB5AGZ  Stillwater, OK
Systems Engineer
OSU Information Technology Department Telecommunications Services Group

2009\03\04@112532 by Benjamin Grant

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you could use it to do this
http://sci-toys.com/scitoys/scitoys/magnets/gauss.html

but i suppose that's probably not what you were going for

2009\03\04@120730 by Jon Chandler

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Speaking of caution with powerful magnets, they can do some real damage!
This link is not for the squeamish - be warned.  When magnets attract
each other
from 20" apart and coming flying together, the results aren't pretty.

http://magnetnerd.com/Neodymium%20Magnets/Dirks%20Accident.htm

Martin McCormick wrote:
{Quote hidden}

2009\03\04@121936 by Martin McCormick

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Jon Chandler writes:
> Speaking of caution with powerful magnets, they can do some real damage!
> This link is not for the squeamish - be warned.  When magnets attract
> each other
> from 20" apart and coming flying together, the results aren't pretty.
>
> http://magnetnerd.com/Neodymium%20Magnets/Dirks%20Accident.htm

Ouch!! That makes my fingers ache just thinking about that. I
have no trouble at all imagining that and worse.

       It's the ultimate digital parity error.


Martin McCormick

2009\03\04@154026 by pic

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Bugger... I just lost 45 mins of my work day - fascinating stuff

-----Original Message-----
From: spam_OUTpiclist-bouncesTakeThisOuTspammit.edu [.....piclist-bouncesKILLspamspam@spam@mit.edu] On Behalf Of
Jon Chandler
Sent: Thursday, March 05, 2009 6:04 AM
To: Microcontroller discussion list - Public.
Subject: Re: [OT] What are Spherical Magnets Used For?

Speaking of caution with powerful magnets, they can do some real damage!
This link is not for the squeamish - be warned.  When magnets attract
each other
from 20" apart and coming flying together, the results aren't pretty.

http://magnetnerd.com/Neodymium%20Magnets/Dirks%20Accident.htm

Martin McCormick wrote:
{Quote hidden}

2009\03\07@141210 by Bob Axtell

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I own a set.

Holding them separated by 2-3", throw them up into the air about 2'
and catch them.
They "click" in a VERY strange, unexpected way while in the air.
Interesting and entertaining.

I think they are pretty much useless. Marital aid?

--Bob

On 3/4/09, picspamKILLspamgavin-egan.com <.....chrisKILLspamspam.....gavin-egan.com> wrote:
> Bugger... I just lost 45 mins of my work day - fascinating stuff
>
> {Original Message removed}

2009\03\07@144322 by Michael Algernon

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Can we see a video ?

> On Mar 7, 2009, at 12:11 PM, Bob Axtell wrote:
>
> I own a set.
>
> Holding them separated by 2-3", throw them up into the air about 2'
> and catch them.
> They "click" in a VERY strange, unexpected way while in the air.
> Interesting and entertaining.
>
> I think they are pretty much useless. Marital aid?
>
> --Bob
>

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