Author Topic: Hard drive magnets (Read 14703 times)

Farlander · « **on:** December 01, 2008, 03:48:14 AM »

Hey guys,

I have 16 NIB hard drive magnets in the shape of rainbows and the backplates still attached. (any advice how to get them off)? I want to use an old cd drive as a bearing, take a blank cd and somehow? fasten the wierd shaped magnets to the perimeter. They are like 2 magnets back to back -- their is north and south on each face on opposite sides. The outer 3 rotating magnets will be fastened to bearings? so they can spin.

like this, can this work?
http://www.youtube.com/watch?v=jYcjjSfiNNE

Thanks

4Tesla · « **Reply #1 on:** December 01, 2008, 03:58:31 AM »

No one that I know of has been able to make a working replicate of the motor in the video.. but it never hurts to try. I don't know about how to remove the hard drive magnets

Jason

sheep1jb · « **Reply #2 on:** December 01, 2008, 04:21:53 AM »

The magnets are glued to the back plate. If you can mount one end of the plate in a vice and bend or twist the back plate with pliers, being careful to only touch the backplate with your tools, the glue between the magnet and plate will crack and you can slide the magnet off. Most I have tried came off little to no damage to the magnet.

exxcomm0n · « **Reply #3 on:** December 01, 2008, 04:25:25 AM »

What you have found is one of the most infamous videos on the Tube (search from alsetalokin and PMM on YouTube or here).

The story as I understand it is that someone had this dream about this configuration, but couldn't build it and peddled it to any that would listen. alsetalokin listened and built it and then made the videos like the one you linked in your post.

There has never been a successful replication to my knowledge, though many have tried.

Don't let that stop you from trying though!

The best way I've found for taking a hard drive magnet off it's backing is either to use a very thin chisel right at the seam of the 2 surfaces (be careful as they (magnets) are brittle and the nickel coating is thin), or to use a guitar sting with its ends wrapped around 2 pieces of wood dowel to make handles and using the string (wire) like a rope saw at the seam.

Have fun experimenting!

X00013 · « **Reply #4 on:** December 01, 2008, 07:21:47 AM »

Throw it at the wall really f'n hard, or try this http://www.youtube.com/watch?v=f5o5HEfo8UY

TechStuf · « **Reply #5 on:** December 01, 2008, 07:34:47 AM »

What you have, essentially, are magnets of very consistent field strength and geometry already attached to high permeability metal backing plate. MU metal, for lack of a more accurate term. Why take them off at all? Wet grind the backing plate to the right shape and distance from the magnet's edge and let the voyage to discovery commence!

TS

AbbaRue · « **Reply #6 on:** December 01, 2008, 07:50:03 AM »

Maybe try some acetone or nail polish remover.
Soak the magnet it that and see if it will dissolve the glue.

Is there a thread on this forum about this self running motor?
I tried finding one but the magnetic motor section is so large.

khabe · « **Reply #7 on:** December 01, 2008, 08:38:33 AM »

Quote from: AbbaRue on December 01, 2008, 07:50:03 AM

Maybe try some acetone or nail polish remover.
Soak the magnet it that and see if it will dissolve the glue.

Dont spend acetone or any else solvent - it does not work - the only thing youÂ´ll get is bad stench and ... upbraid for from mama

Its like Murphy's Law - magnets will be self removed when you dont want it

Years ago I disassembled few hundred HDDs to get parts for experiments - very lot I used as tool-holder screwed on the wooden wall - keeps nicely tongs, hammers, screwdrivers ...
I undersood that most of all they fears dropping, beating ... bending ...
Just fall it down to floor (bad idea) or just put it on your palm and beat once focused with small hammer on to back side ... or just bend a little bid the back iron using vise.
regards,
khabe

derricka · « **Reply #8 on:** December 01, 2008, 09:13:11 AM »

Both methods described above will work. Soaking overnight in Acetone will remove most magnets (Note: some epoxies seem immune to acetone). Bending, or prying off the backing plates avoids the nasty Acetone, but will often peel part of the protective chrome layer off the magnet (The magnet will still work). So your call: Stinky and pretty vs quick and ugly. BTW, These curved HD magnets are actually quadropole magnets, meaning they are really two magnets in one. To get conventional magnets, you would have to saw them in half, but no point in using Acetone if you intend to saw.

derricka · « **Reply #9 on:** December 01, 2008, 09:25:48 AM »

Both methods described above will work. Soaking overnight in Acetone will remove most magnets (Note: some epoxies seem immune to acetone). Bending, or prying off the backing plates avoids the nasty Acetone, but will often peel part of the protective chrome layer off the magnet (The magnet will still work). So your call: Stinky and pretty vs quick and ugly. BTW, These curved HD magnets are actually quadropole magnets, meaning they are really two magnets in one. To get conventional magnets, you would have to saw them in half, but no point in using Acetone if you intend to saw.

Quadropole magnet:

NNNNNNNNNNNSSSSSSSSSSSS
SSSSSSSSSSSNNNNNNNNNNNN
PPPPPPPPPPPPPPPPPPPPPPPPPP P= backing Plate

Nostradamus2 · « **Reply #10 on:** December 01, 2008, 09:44:24 AM »

Quote from: derricka on December 01, 2008, 09:25:48 AM

To get conventional magnets, you would have to saw them in half

To cut neodymium magnets you need diamond cutting instruments, for example dremel with diamond cutting wheel, but be careful, the dust is explosive and toxic, I better suggest simple break it in two halfs, they are quite brittle.

Paul-R · « **Reply #11 on:** December 01, 2008, 05:44:40 PM »

Quote from: Farlander on December 01, 2008, 03:48:14 AM

I have 16 NIB hard drive magnets in the shape of rainbows and the backplates still attached. (any advice how to get them off)?

Try a sharp knife. It worked for me.
Paul.

wattsup · « **Reply #12 on:** December 01, 2008, 06:42:30 PM »

I just got 10 of them and started removing the mags with a good knife edge and small hammer. Most will break and the coating will tear off.

khabe · « **Reply #13 on:** December 02, 2008, 01:18:49 AM »

I told you:
A.) put this magnet on your hand (free hand - not on the table!) back iron up - beat once and focused with small hammer on to the middle of back iron

B.) use vise, keep back iron from one end with vise and bend it from another end with good pincers. Bending direction must to be out from magnets of course

Both methods takes few seconds for me,
Damaged versus Good .... 1/100
cheers,
khabe

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Author Topic: Hard drive magnets (Read 14703 times)

Farlander

Hard drive magnets

4Tesla

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