Unusual rib structure?

[Delwin D Fandrich]

----- Original Message -----
From: "David Love" <davidlovepianos@earthlink.net>
To: "Pianotech" <pianotech@ptg.org>
Sent: May 07, 2003 9:32 PM
Subject: Re: Unusual rib structure?


> I noticed, the other day, on a Hamburg Steinway C, that the cutoff bar
was
> notched to allow for the feathered part of the rib to extend beyond it to
> the rim.  Is this counterproductive?  Generally, with cutoff bars do the
> ribs terminate at the cutoff bar?
>
> David Love
> davidlovepianos@earthlink.net
>


If you leave a substantial portion of a spruce panel unsupported it will
buckle and probably crack. Assuming the soundboard cutoff is truly a cutoff
then the extended portion of the rib is simply there to keep the excess
panel from self-destructing.

Del