Unusual rib structure?

[Farrell]

Excellent. Good points. Makes sense. Thanks for the insight.

Terry Farrell
  
----- Original Message ----- 
From: "Delwin D Fandrich" <pianobuilders@olynet.com>
To: "Pianotech" <pianotech@ptg.org>
Sent: Friday, May 09, 2003 12:17 PM
Subject: Re: Unusual rib structure?


> 
> ----- Original Message -----
> From: "Farrell" <mfarrel2@tampabay.rr.com>
> To: "Pianotech" <pianotech@ptg.org>
> Sent: May 09, 2003 3:14 AM
> Subject: Re: Unusual rib structure?
> 
> 
> > Del wrote:
> >
> > "I prefer to terminate the ribs about 10 mm inside the inner rim for at
> least the half of the rib set."
> >
> > Why 10 mm gap? What is your preference for the other half? - rib goes
> right up to rim? - rib overlaps rim? Why? Is it OK to have all ribs
> terminate without overlapping rim?
> 
> 
> I like the outer perimeter of the soundboard assembly to be relatively
> flexible throughout the bass and lower tenor region. Hence the 10 mm gap.
> (There is nothing magic about the 10 mm--it's just a safe amount.) Up into
> the tenor/treble other factors come into play. With a so-called "solid"
> board there is always a region along which the grain of the soundboard
> panel roughly parallels the inner rim. This area is prone to cracking
> unless the ribs continue on over the inner rim. And, from this region on
> up, the assembly can generally use the added stiffness contributed by the
> overlapping ribs.
> 
> Del
> 
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