Re: [ATM] Help with Strut Flexure in my 3 Truss DOB

[fabio@voreas.com]

Pre-stressing with a threaded rod is a well-known way of increasing a tube's 
rigidity--at least until the stress increases to a point where the tube 
walls collapse due to buckling--since it change the moment of inertia. In 
this particular case, bracing the three tubes on top would be more 
beneficial. On the balance issue, perhaps one could use several strands of 
low-stretch archery string under tension inside the tube in lieu of the 
threaded rod. 

> 
> Just a random thought, no experience with it: would there be any
> rigidity gain if the tubes were pre-stressed somehow, say by a
> threaded rod passed down the axis and then that rod tensioned?
> This would change the balance of the scope adversely.  It might
> require tweeking with a torque wrench from time to annoying time.
> But would it increase rigidity significantly? 
> 
> Dave
> -- 
>       The law has converted plunder into a right and lawful defense
>       into a crime.  -- Frederic Bastiat, 1850 
> 
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