How to make strong magnets?

[siliconmike]

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

 

[Nikolas Britton]

siliconmike wrote:

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

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...

 

[spudnuty]

Check out this source:
http://www.magnetsource.com/airfieldmodels/
and this forum:
http://www.rcgroups.com/forums/index.php
especially the indoor and microflight.
search for magnet sources, out runners.
Richard