[PLUG-TALK] magnets from hard drives

[Pete Lancashire]

make that a 3-1/2 .. old time slip there

On Thu, Jul 23, 2015 at 5:30 PM, Pete Lancashire <pete at petelancashire.com>
wrote:

> Try a 5-1/4 drive made from about 2005.
>
>
>
> On Thu, Jul 23, 2015 at 4:13 PM, Keith Lofstrom <keithl at gate.kl-ic.com>
> wrote:
>
>> The head-deflection linear actuator in a hard drive has
>> a coil running between two powerful magnets.  Needing two
>> magnets for a project (actuating two door-closing sensors),
>> I took an old 10 GB hard drive apart and unscrewed the
>> magnets, and used the same mounting holes to attach them
>> to the door jams.
>>
>> Then polished the drive platters with a bit of emery paper.
>> The old bits take up less room if they are scraped off the
>> platters. :-)
>>
>> Before tossing those ancient hard drives, pull the magnets
>> for future projects.  They are is refrigerator magnets, if
>> you have a refrigerator you want to mount on a steel wall. :-)
>>
>> Keith
>>
>> P.S.  I have not taken apart any 2 inch drives, or much
>> newer drives - those may be constructed differently.
>>
>> --
>> Keith Lofstrom          keithl at keithl.com
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>
>
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