[Amps] Vacuum Variable Fatigue Failures

[ToddRoberts2001 at aol.com]

In a message dated 2/16/2008 2:20:16 P.M.  Eastern Standard Time, 
aa6eg at hotmail.com writes:
Folks,

I was looking  closely at the mechanical marvel that is a Jennings Vacuum 
variable  capacitor.
I am wondering about whether the copper bellows arrangement that  allows 
extension and 
contraction of the "rotor" have a finite number of  cycles back and forth 
before they are likely
to fatigue crack at the folds of  the copper.  


The Jennings PV4-500 is listed as having over 2.5 million life  cycles.
 
73 Todd WD4NGG



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