[Boatanchors] Need magnetic shield for shaded pole motor

[rbethman]

One has to do a bit of hunting, but perforated or expanded steel mesh is 
available.

I erred once again.  My mind went in the RF shielding direction. ( I 
mentally went into thinking Faraday Shielding.)

Soft steel will definitely work better.

Heavier steel would be even better, however, wrapping a transformer or 
shaded pole motor with it then brings heat dissipation into the equation.

Finding expanded mesh steel for use in our hobbies is a pain. Most 
suppliers do not want to deal in small sizes or quantities.

It may also be harder to locate also.

The last thing is cannibalization of older radio gear final cages.  
These "normally" in older gear, steel.

Later cages are aluminum.  Much less effective, although magnetic 
properties through eddy current is used still.

Bob - N0DGN

On 1/2/2014 2:33 PM, Al Klase wrote:
> 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
>>>>>
>>>
>>
>