Terry What Del describes is common. Kawai does it inuprights as well. Tony Caught Darwin Australia caute@optusnet.com.au ----- Original Message ----- From: "Delwin D Fandrich" <pianobuilders@olynet.com> To: <pianotech@ptg.org> Sent: Sunday, February 17, 2002 4:43 PM Subject: Re: Soundboard Edges > > ----- Original Message ----- > From: "Farrell" <mfarrel2@tampabay.rr.com> > To: <pianotech@ptg.org> > Sent: February 16, 2002 3:29 PM > Subject: Soundboard Edges > > > > While driving to Mt. Tabot Missionary Baptist Church this morning I had to > turn off the radio and try and come to grips with the edges of a new > soundboard. Let's say you make a 60-foot rib-radiused board (60-foot - the > radius, not size of the board). OK, so now you have this little dome with a > height of maybe 3/8" or so in the middle. (Or maybe you make one with > smaller radii, so you have more crown - whatever.) The top edges of the > piano rim and belly rail are at the same elevation - in the same plane. > ------------------------------------------------------- > > > Ron's answer covered most of it, but.... > > Kimball, and probably others, developed a process to crown their grand piano > inner rims to accommodate a spherically shaped soundboard. This has long > been a common practice with vertical pianos--the soundboard liners are > crowned to accept the soundboard in a spherical shape. > > The soundboard will still be distorted for reasons that will be obvious if > you think about it a bit. > > Del >
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