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[DPRG] ceramic magnets

Subject: [DPRG] ceramic magnets
From: Earl Bollinger earlwbollinger at attbi.com
Date: Sat Dec 28 22:24:00 CST 2002

Really cool,

Speaking of magnets. Does anyone know where I can obtain some 1/16" to 1/8"
diameter rod magnets, that I can use for hall effect sensors to detect, for
uses like robot arms, grippers and such?
I tried the dremel cutting disk method on a magnet, and the little piece
more or less disintegrated before you could do anything with it. I have a
little micro robot that has a little tiny pager motor powered arm on it and
it has the only two little 1/16" - 1/8" or so diameter magnets that I have
ever found on it. I would love to find some more.

-----Original Message-----
>From: dprglist-admin at dprg.org [mailto:dprglist-admin at dprg.org]On Behalf
Of Rodent
Sent: Saturday, December 28, 2002 10:07 PM
Subject: Re: [DPRG] ceramic magnets

And before someone asks:



Here is the explanation from one web page:

It happens that over the years of domestic breeding, cattle have had most of
the intelligence bred out of them. This may be convenient for some purposes,
but it has reached the point where it has made their grazing habits pretty
indiscriminate, and they scarf up scraps of metal along with the more
nutritious browse. (N.B., we're not talking about BSE-afflicted cows here,
just your ordinary ruminant of average-for-a-cow but still stupefiedly low
intelligence.) Too much of this, and cows can develop ``hardware disease.''

Treatment is to feed the afflicted cow or bull a strong little bar magnet --
a couple of inches long, no sharp edges -- which clumps together all the
metal (nails, bits of barbed wire) in the leathery first stomach (rumen), so
it doesn't get to the downstream, more easily perforated parts of the GI
tract. You get the magnet into the animal with the same device used to get
pills in.


> Maybe it was a coated cow magnet.

> > My only experience with a similar product was a magnetic mixer used for
> > chemicals (in my case, photographic processing chemicals). I don't think
> > the impeller was even a magnet, but just a ceramic-coated piece of
> steel --
> > it was quite heavy. I likened the thing to a white Good 'n Plenty.
> >
> > You can readily test if the impeller is a magnet of course, but I
> > the only way to determine if it's a coated magnet is to saw it in half.
> > think that'll let all the remaining magnetism leak out, though, so be
> careful!

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