[Boatanchors] Need magnetic shield for shaded pole motor

[Al Klase]

Jim,

Non-ferrous metals, copper etc., will do little to attenuate a magnetic 
field. There is an alloy, know an mu-metal, that was designed just for 
such applications, but it's expensive and hard to come by. Google same. 
Start here: 
http://www.pmlindia.com/hi-perm/Magnetic-Shield.htm?gclid=CJ3ghvWc4LsCFTNp7AodLUsAmA

However, mu-metal only has a slight edge over soft iron or even steel. 
The coffee can may be a little too thin. The wreckage of a LARGE 
transformer may be the place to start.

Al

On 1/2/2014 2:22 PM, Charlie , W5COV wrote:
> I keep some handy copper sheets on hand all of the time now, comes in 
> handy for various projects. This that I keep on hand, can be cut with 
> scissors, and is relatively cheap, as am I <grin> .
>
> I picked it up from a from a place called Electronics Goldmine. 
> http://www.goldmine-elec-products.com/
>
> Really handy to have around.
>
> Usual disclaimer no financial interest, just a satisfied customer.
>
> Charlie, W5COV
>
> On 1/2/2014 1:14 PM, rbethman wrote:
>> Use either the cut up coffee can as John suggests, they ARE becoming 
>> another rarity.
>>
>> Now the coffee is coming in plastic containers. :^(
>>
>> Copper is still available as a roofing/flashing item in the Home 
>> Improvement stores.
>>
>> I have procured some silver plated copper expanded mesh some years back.
>>
>> It was offered on one of the mailman.qth.net lists. It may have been 
>> this one or it may have been the glowbugs list.
>>
>> Bob - N0DGN
>>
>> On 1/2/2014 11:33 AM, J. Forster wrote:
>>> A cut up coffee can? Seriously.
>>>
>>> -John
>>>
>>> ============
>>>
>>>
>>>> Any ideas for an effective Gaussian shield for an open frame shaded 
>>>> pole
>>>> motor or a source for very high permeability transformer core uncut
>>>> sheets.
>>>>
>>>> Thanks for any ideas--- Kindest regards Jim K9AXN
>>>>
>>
>

-- 
Al Klase – N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/