ChrisAtUpw@....... wrote:
(snip)

> You  need to keep the edges of the Cu plate well away from the edges 
 > of the magnetic  field - to avoid small magnetic forces.

This is a very good point.  The eddy currents circulate around the 
spot where the field lines pass through the surface of the metal, when 
there is movement.  You need some metal outside the concentrated area 
of field to make best use of the magnetic field.  You can always back 
the magnets away from the metal to weaken the field if you have too 
much damping.
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