[Jewelry making - Article 00800] - Re: [Orchid] Metal Shrunk by Powerful Magnetic Field?

[Peter W . Rowe]

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>     I thought is a bit wierd, the claim for instance for "identical
>     volume" did not seem to make any sense. 

    Sure it does, Charles. It HAS to be that way, so long as no metal is
    actually being removed. it's only being formed. The density won't
    change, nor the type of metal or it's weight, since it's only being
    formed, with nothing removed. So then, the volume must remain the
    same. (though if this were a cast piece, likely any porosity would be
    compressed, which WOULD then slightly increase the density and lower
    the volume. But a struck coin is already fully dense, so that's not
    happening here...) 

    The answer of course is that while it decreases in size in the
    horizontal plane, which is perpendicular to the orientation of the
    coil and the magnetic field produced by that coil, the thickness of
    the coin is increased accordingly. It's the same as one might do with
    a hammer when upsetting the edge of sheet metal, except this method
    works on the entire sheet simultaneously, rather than just the edge
    as one would do with a hammer. If high enough power levels could be
    achieved, the method would turn the coin into wire, with perhaps the
    remnants of the coin image maybe still showing on the ends of the
    wire... 

    I've seen lower power versions of this forming method used to
    compress fairly large diameter thin wall tube into a necked in shape
    in the middle (hourglass sort of thing) with minimal distortion. In
    that case, it was part of the forming process to produce some sort of
    rf wave guide, if I recall right. That machine was doing one after
    another, so there the coil producing the magnetic field wasn't self
    destructing... I might be wrong, but I think that was basically the
    same technology as the example with these coins. Saw it not long ago
    on some Discovery Channel show on high tech manufacturing methods...
    (love that series of TV channels...) 

Peter
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