Unusual rib structure?

[gordon stelter]

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

--- Delwin D Fandrich <pianobuilders@olynet.com>
wrote:
> 
> ----- 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
> 
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