laminated ribs

[Ron Nossaman]

>     _Ah, then you're getting down into super soft hammer country
>     where you'll be adding lots more ribs very soon now._
> 
>    Ron... Are you saying that in Something like a Steinway A (or other) 
> which in my opinion has a pretty good rib scale as far as mechnanical 
> support goes that increasing the beam strength on the original 12 ribs 
> isn't enough stiffness to support bearing without adding more ribs? 
>   Dale

Dale,
Those ribs were originally built into a CC board. How can a 
compression crowned board get mechanical support from the rib 
scale, however "good" the scale looks? The ribs in CC boards 
resist the crown that panel compression is trying to form and 
maintain, and just put more compression load on the panel. 
It's an entirely different system. Do a bearing load analysis 
on the ribs as load carrying beams and see what the numbers 
say. They'll say that the rib scale isn't adequate to support 
bearing without substantial panel compression support.

Ron N