This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment Ric, Thanks for spending the time to do the diagrams. It really helps the = discussion. I'm going to take a wild stab, based only on intuition, so = I won't even bother with a flame suit. It's supposed to snow today, = anyway -- we could use the heat! It seems like it's a matter of degree. A force can exist, but be so = small as to be negligible. The Moon has a gravitational pull to be = sure, but the Earth's is so much stronger, it's irrelevant. A = soundboard decal undergoes stress when a board is crowned, but it's = irrelevant. The situation seems more like a stronger force overcoming a weaker one. = The weaker one subtracts from the stronger one, and then the situation = is in equilibrium. I'm thinking of a small leaf spring, like for = pedals, about 6" long, say curved in an arc of one foot radius. It = resists being straightened. If you take a stronger spring, of thicker = metal, same length, but curved to a 6" radius, and nest the two so the = stronger's on the outside, the thinner spring will resist a bit, but the = vector of its force is overwhelmed by the stronger spring. Same with the soundboard and ribs. If the force of the SB absorbing = moisture is so strong as to bend the ribs, then they're irrelevant after = that point, it seems. The material used seems to matter. If the ribs = were spring steel, and were initially flat, then of course they'd = continue to want to straighten out, forever. What does wood do? If the SB were stronger than the ribs to begin with (after coming up to = normal humidity), wouldn't it always stay stronger than the ribs? --Cy Shuster-- Rochester, MN ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/cb/53/df/4e/attachment.htm ---------------------- multipart/alternative attachment--
This PTG archive page provided courtesy of Moy Piano Service, LLC