FWIW - I've noticed on many boards that even when positive crown is present, there often will be an inch-or-two wide swath of negative crown adjacent to the rim. I guess from the ribs being thin there. I wonder what, if any, consequences there may be to this. Terry Farrell ----- Original Message ----- From: "Ron Nossaman" <RNossaman@cox.net> To: "Pianotech" <pianotech@ptg.org> Sent: Wednesday, May 07, 2003 11:47 PM Subject: Re: Unusual rib structure? > > > > That's why I asked. Everyone wants to measure crown in the place where > > > soundboards nearly never go concave, and never the place where they nearly > > > always do. How does it look in octave 6, where crown typically reverses? > > > >Ah! I didn't know that. Well, I placed a straight edge up under the > >soundboard close to the second treble rib. My guess (since I can't really > >measure very well there) is that I have slightly less than 1/8" of crown > >there. > > Very surprising. > > > >Most of the curvature seems to be where the rib tapers, if that > >means anything. > > Means it's a compression crowned board. > > > >The middle of the high treble board is less curved, with > >perhaps 1/32" of arch to it, depending on where the starting and stopping > >points are defined. So is it a keeper? ;-) > > It might very well be a miracle! > > Ron N > > _______________________________________________ > pianotech list info: https://www.moypiano.com/resources/#archives
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