laminated ribs

[David Love]

Ron:

I just want to revisit this for a moment.  Do you mean your typical load is
900lbs?  And if so, what kind of deflection are you building your ribs for,
i.e. what percentage of the original crown do you figure is remaining after
the board is loaded?

David Love
davidlovepianos at comcast.net 

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Ron Nossaman
Sent: Saturday, February 18, 2006 9:27 AM
To: Pianotech List
Subject: Re: laminated ribs


>     Ron, Terry
>     OK ....The laminated rib  compared to a solid rib .  Here's another 
> point of view.
>   Ok Now I,m confused.  If were only trying to support only 400 to 600 
> lbs. of down bearing force as Del inferred recently or whatever one 
> calculates this to be,  then what's all the fuss about.  

My loading of new boards these days is typically half again 
over 600 lbs.