----- Original Message ----- From: "gordon stelter" <lclgcnp@yahoo.com> To: "Pianotech" <pianotech@ptg.org> Sent: August 13, 2003 1:46 PM Subject: Re: Soundboard crown & carbon fiber & cellos > Yes. And since it has been repeatedly stated by some > on this list that the ribs alone support crown, with > no help whatsoever from the rim or board, I do > sincerely hope that they who have made this assertion > will try carbon fiber ribs, or some other material > with no compression set. > Thanks! > Thump Keeping in mind that there are (and long have been) two methods of crowning soundboards--let's try not to confuse the two systems. What you are saying above applies only to rib-crowned soundboard systems. In the case of the compression-crowned soundboard, the internal compression of the panel (by creating a stress-interface against the ribs) both creates and supports crown. Obviously, in this system the panel is "helping" to support crown. In neither case does the rim contribute to the long-term mainanaince of crown. Del
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