Hard drive magnets

[TechStuf]

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]

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]

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 you´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]

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]

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