[Boatanchors] Need magnetic shield for shaded pole motor

[rbethman]

John,

Yes, copper in layers DOES work.  It is a matter of cost.

Most don't understand the use of aluminum in shielding.  They have to 
begin understanding eddy currents.

I wonder how many have run across an electromagnetic system that has 
been in use for decades to separate aluminum?

No, I am not smoking shrubbery!  Part of welding Inspection Training at 
Hobart.

Bob - N0DGN

On 1/2/2014 2:50 PM, J. Forster wrote:
> The problem with mu-metal is that machining (cutting & bending) destroys
> its magnetic shielding properties. There is another shielding material,
> called Netic-Conetic that is more forgiving.
>
> Copper is OK, provided it's several skin depths thick.
>
> I do agree that coffee cans are a bit on the thin side. If you can find a
> tin-plated-steel can of heavier guage, go for it. A source might be the
> larger 'family size' soup cans or the dumpster behind a resteraunt.
>
> The tin plating is mostly a rust preventative. A light coat of clear
> Krylon will do fine.
>
> -John
>
> ===============