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Re: Wire sag

Hi Curtis,

I will continue to look into this. We can use 33g as the baseline tension until more is found out. This gives about a 4mm stretch in the wire during installation with about 4mm of additional stretch (minimum) before reaching  yield.

Cheers,

       Tim

Curtis A. Meyer wrote: 
Thanks Tim -

  the ~100g number is the one that has stuck in my mind for the yield and we typically
took a factor of 2 for safety. However, using your formula I find a sag of 54 micorns for
33g of tension and a 34 micorn sag for 50 g of tension. Both of which are allowable.
We should spec the yield to be as large as they can resonably make it, but I believe that
we could live with the 65 grams, but if we got more, we would take advanteg of it.

curtis
On Mon February 25 2008, you wrote:
  
Hi Curtis,

Attached is my spreadsheet. As shown, 30g shows 58 micron deflection. I 
have been looking at data and called California fine wire. The yield 
load from the data I looked at varies from 65 g to 110 g for a 20 micron 
tungsten wire.More research is required. California fine wire said if we 
give them our minimum yield requirements, they will see if that can be made.

Cheers,

       Tim



    


  
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