Hi Chris (and everyone else, too...)

You wrote:
>        An alternative is to use a flat rectangular coil with quad NdFeB
>magnets on mild steel backing plates. You might find this construction 
>easier? See
>drawings at http://jclahr.com/science/psn/chapman/lehman/index.html The 
>more
>powerful NdFeB magnets can give larger magnetic fields in a wider gap.

I built a damping assembly for my AS1-copy and used this type of dampening. 
(excellent drawings!)  For it's use here, I guess I would use a coil (maybe 
like a  220v relay coil?) between the magnets and instead of using it as the 
actual sensor (like on the AS1), it would rather function only as a 
damper...do I understand correct?

>        You need to be able to measure the force / current characteristic 
>and
>the resistance to calculate the feedback required in a triple loop system.
>        Look also how Bob McClure has used NdFeB magnet / coil systems at
>http://jclahr.com/science/psn/mcclure/index.html

It is this part that scares me.  I don't have a really good backround in 
electronic theory to understand some of the fine points of this stuff.  If I 
went ahead with this some time in the future, are there instructions 
somewhare that could tell me how to measure and calculate these values?  I 
know that in reading though STM's emails that there is mathlab formula's and 
other such stuff....but I don't even know what mathlab IS!  :(

- Mike


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