Unusual rib structure?

[Delwin D Fandrich]

----- Original Message -----
From: "gordon stelter" <lclgcnp@yahoo.com>
To: "Pianotech" <pianotech@ptg.org>
Sent: May 08, 2003 3:33 AM
Subject: Re: Unusual rib structure?


> Del,
>      Maybe its also there because a rim makes a better
> rib termination point/support/buttress than a
> relatively flimsy cutoff bar. One can assume that
> there is tremendous compressive stress on a rib,
> end-to-end, on a loaded board, non?
>      ( Especialy on a compression crowned board. )
>      Cheers,
>      Thump

Not really. Until the board collapses there is some compression on the
bottom side of the rib but the top of the rib is under tension. (Assuming a
compression-crowned soundboard assembly.)

Del