Neodymium magnets

• Jun 8, 2011

• #33

Benm

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InfinitusEquitas said:

I figured as much. Chances are the article is correct in regards to ordinary magnets. Not n50+ magnets.

Click to expand...

Well, i don't know about N50 per se, but i've seen a test where a guy covered a harddrive in magnets from other harddrives to see if it affected the data on it. The drive remained working just as is should.

This harddrive was still in its normal metal case though, perhaps the data could be wiped if you sweep a magnet directly over the unprotected platters... but once the platters are exposed that drive isn't going to last very long outside a cleanroom anyway.

 

• Jun 8, 2011

• #34

InfinitusEquitas

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Hmm, I have an old dell tower with ide hard drives that crapped out on me a few months back. I think there is a 40gb drive in there... would be perfect sacrifice for an experiment.

Bigger question is whatever happened to my magnet, I haven't seen it in years... probably stuck somewhere:shhh:

 

• Jun 8, 2011

• #35

SLPbum

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Curious?
Do earth magnets ever lose there power over time?


RDCII

 

• Jun 8, 2011

• #36

InfinitusEquitas

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IIRC all magnets lose power over time. The loss is very minimal though. With the ones we're talking about I can't see half a percent or something making a real difference.

From what I remember, the only way to actually make a magnet less magnetic is to heat it. I'm sure any kind of stress would work though:thinking:

 

• Jun 8, 2011

• #37

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grenadier

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Kjmagnetics has always been good to me, maybe they have what you need?

 

• Jun 8, 2011

• #38

Bionic-Badger

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I bought a bunch of magnets from Super Magnet Man. No idea about shipping to Canada, but those magnets were good for my uses.

 

• Jun 8, 2011

• #39

JaiNobeZ

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InfinitusEquitas said:

IIRC all magnets lose power over time. The loss is very minimal though. With the ones we're talking about I can't see half a percent or something making a real difference.

From what I remember, the only way to actually make a magnet less magnetic is to heat it. I'm sure any kind of stress would work though:thinking:

Click to expand...

Heat it, or thwack it with a hammer a bunch of times.

 

• Jun 8, 2011

• #40

LaZeRz

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What type of magnets would you find in a HDD? I have some computer parts lying around that I wouldnt mind taking apart

 

• Jun 8, 2011

• #41

Pilgor

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LaZeRz said:

What type of magnets would you find in a HDD? I have some computer parts lying around that I wouldnt mind taking apart

Click to expand...

Neo magnets, they are strong little buggers, you get two per harddrive.

 

Last edited: Jun 8, 2011

• Jun 8, 2011

• #42

LaZeRz

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Looks like I have a project to do over the weekend

I also have a VCR recorder that I wouldnt mind taking a few IR filters and lenses from

thanks Pilgor

+1 for the pic

Could those potentially bruise your finger if it gets in the way of the two?

 

Last edited: Jun 8, 2011

• Jun 8, 2011

• #43

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Brenner

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It is very hard to get N52 these days.
NdFeB neodymium is excellent,

BUT

larger pieces are very fragile.

On this pic is what 5mm spheres can hold :

http://www.orbtronic.com/magnetic/magnetic_orbs_orbtronic.jpg







:bowdown:

 

• Jun 8, 2011

• #44

Pilgor

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Won't cause bruises, but if you pinch yourself, you will get a really nice blood blister. The ones I have can stick though my hand. As others have said, Neo magnets are weak so try not to let them snap together.

Another magnet pic while still in harddrive. Just in case you need it.

 

Last edited: Jun 8, 2011

• Jun 9, 2011

• #45

JaiNobeZ

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I have some harddrives... I can't get 'em open. Does it call for some big tools?

 

• Jun 9, 2011

• #46

LaZeRz

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I didnt have the tools to unscrew the screws so I got some needle nose pliers and Gripped em really tight and unscrewed them

I pretty much demolished my HDD

but I got 1 magnet, I couldnt find the second :thinking: I think they replaced the second by a metal plate

Pic:

One of these can easily lift up a computer PSU

Now I still have a PSU to convert into a Lab PSU and a VCR recorder to take apart :eg: although those 200v capacitors are taunting me

 

Last edited: Jun 9, 2011

• Jun 9, 2011

• #47

Trevor

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Careful with that. Those are really brittle and enjoy using sharp corners to pinch you when the halves snap together.

-Trevor

 

• Jun 9, 2011

• #48

swimminsurfer256

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Trevor said:

Careful with that. Those are really brittle and enjoy using sharp corners to pinch you when the halves snap together.

-Trevor

Click to expand...

I sense someone speaking from experience