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How to make strong magnets?

S

siliconmike

Jan 1, 1970
0
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
 
J

Joe Soap

Jan 1, 1970
0
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 ?

Search ebay for neodymium
 
Y

Yukio YANO

Jan 1, 1970
0
siliconmike said:
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

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
 
N

Nikolas Britton

Jan 1, 1970
0
siliconmike said:
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...
 
J

Jonathan Kirwan

Jan 1, 1970
0
<snip>
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...

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
 
I

Impmon

Jan 1, 1970
0
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.

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.
 
C

CWatters

Jan 1, 1970
0
The motors in the drives are rather powerful too...

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