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 > > _______________________________________________ > pianotech list info: https://www.moypiano.com/resources/#archives
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