In a message dated 11/11/02, n0ssy@......... writes:

> Has anyone tried to us Kevlar cord to support the boom on a Lehman 
> Seismometer?
> I have found a source for .025" cord a was wondering how well it might work.
> 

Hi Dewayne,

       I would expect there to be a fair amount of internal friction in a 25 
thou cord when it bends. You might want to consider something like Kapton 
film? Alternatively, you can buy very thin metal foils quite easily and get 
steel music wire down to 7 thou dia. You can get 1/2" wide steel Gauge strips 
1.5 thou thick from a tool merchant. K&S metals also sell thin sheets of foil 
including 2 thou stainless steel (or you can cut up an old electric razor 
foil!)
       Metal foils are generally more reliable than plastic.

       Regards,

       Chris Chapman
In a message dated 11/11/02, n0ssy@......... writes:



Has anyone tried to us Kevlar cord to support the boom on a Lehman Seismometer?

I have found a source for .025" cord a was wondering how well it might work.

 Dewayne Hill



Hi Dewayne,



       I would expect there to be a fair amount of internal friction in a 25 thou cord when it bends. You might want to consider something like Kapton film? Alternatively, you can buy very thin metal foils quite easily and get steel music wire down to 7 thou dia. You can get 1/2" wide steel Gauge strips 1.5 thou thick from a tool merchant. K&S metals also sell thin sheets of foil including 2 thou stainless steel (or you can cut up an old electric razor foil!)

       Metal foils are generally more reliable than plastic.



       Regards,



       Chris Chapman