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How to make strong magnets?

Discussion in 'Electronic Basics' started by siliconmike, May 26, 2005.

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  1. siliconmike

    siliconmike Guest

    I would appreciate if anyone can advise as to how to make magnets. I
    have an electronic engineering background, but have never done this
    before. I want to make tiny magnets, say size of 4mm x 4mm or 6mm x
    6mm, of the power of 4000 to 5000 Gauss (higher the better)..

    What material should I use ?
    What coating should I do on that material for corrosion protection ?
    What would be the thickness of the coating ?
    Should I do coating before / after magnetizing ?
    What would be the coil / dc power setup ?
    How do I measure the strength afterwards ?

    Any advise would be great.

    Thanks
    Mike
     
  2. Joe Soap

    Joe Soap Guest

    Search ebay for neodymium
     
  3. Yukio YANO

    Yukio YANO Guest

    My wife buys 4mm R/E magnetic clasps for her Bead work. Don't know
    strength but sure beats the older styles for grip. Test by loading the
    clasp and note total weight required to uncouple the clasp.

    Yukio YANO
     
  4. Find some dead hard drives and pull the magnets from them. I don't know
    what kind they are but they are very powerful, keep them very far way
    from credit cards... I found that out the hard way! Hold them up into a
    fluorescence light ballast, they will easily pick up the 60Hz hum and
    quiver in your hand like theres no tomorrow.

    The motors in the drives are rather powerful too...
     
  5. Reasonable advice. I haven't pulled any from hard drives, but I have
    pulled them from old (dead) CD-ROM drive heads. And they are pretty
    nice! About .22" x .29" x .12" in size. And very strong.

    Jon
     
  6. Impmon

    Impmon Guest

    I got a few out of old 5.25" full height drives. First time I let the
    2 pieces get close together with my finger in between, I had black and
    blue bruise for several days. Bring it within a foot of CRT (TV or
    monitor, doesn't matter as long as it is CRT) and you get
    multi-colored lava lamp impression.
     
  7. CWatters

    CWatters Guest

    Model flyers rewind them and use them to fly small RC model planes.
     
  8. spudnuty

    spudnuty Guest

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