[Boatanchors] Need magnetic shield for shaded pole motor

[Mike Hanz]

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.

Perhaps better to say it degrades it, John.  Any physical deformation, 
even dropping it on a sharp edge, can cause problems. It has to be 
annealed after forming, so a heat treat operation is in order following 
fabrication of the shield structure.

At least that's what I recall from working with the stuff back in the 
dark ages.

     73,
  - Mike