PSN-L Email List Message

Subject: Re: New Seismo
From: Dave Nelson dave.nelson@...............
Date: Sun, 31 Jul 2011 16:29:32 +1000



Hi Randall, Brett, John, Ted, Chris and co...

I appreciate ALL the input
  I really thought that the slice of aluminium  I had between the 
reasonably strong
magnets would have been enough  obviously not!

   Ted's comments are valid, I can feel the eddy generated when passing the 
aluminium between the poles of the magnets but it doesnt feel as strong as
what Ted is suggesting it should.
   I had already cut back on the mass to 2 lb instead of the originally 
planned
4lb.  If I have to I will go back to 1 lb

   I think I will also do a bit of a redesign and put the magnet frame for the
dampening separate ... sitting on the main frame as Chris has done in a couple
of his units.
I was waiting to hear back from him as to if there is any advantage  having 
fix
magnets and the vane moving ie. fixed to the boom, or the other way around 
like
I had.


cheers
Dave


At 02:40 PM 31/07/2011, you wrote:
>Dave,
>Just for laughs, here's the other end of the specturm in regards to mass.
>They use an effective mass of 19 grams, and don't do badly at all.  Design 
>by the 'other' Dave Nelson.
>http://bnordgren.org/seismo/gif_images2.htm
>Brett

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