[Jewelry making - Article 00766] - Re: [Orchid] Product Query: Magnetic Tumblers

[John Burgess]

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    One can buy demagnetgisers, and of course bulk audio tape and
    videotape erasers are demagnetisers. 

    If you happen to know any home video enthusiasts, they might help by
    using their machine. If pins or ball bearings clump together it is
    because they are magnetised. As an example if you take a piece of
    hardened steel and lay it on a bench in a North-South direction, and
    give it a sharp bang, it will attract a compass needle, having become
    magnetised in Earth's field. 

    When I was heavily into manipulating sound tapes, I made a tape
    eraser by taking an old TV transformer, removing the secondary coil,
    and the primary produced a very powerful alternating magnetic field
    (if the huge power demand didn't blow a fuse or melt the primary
    coil) and one simply lay the material; bearings, screwdrivers etc,
    on a plastic tray in the field, and slowly moved the tray away from
    the field, thus slowly weakening the field's effect to zero. 

Cheers for now,
John Burgess; johnb AT ts.co.nz of Mapua, Nelson NZ

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