---------------------- multipart/alternative attachment Hi folks Ok... this round has been full of good stuff, and I have been really enjoying sitting back and reading Phils input and the responses it has generated. Reading back a bit to review... this quote from one of Nossamans posts stuck out at me... snip.... Given a panel crowned assembly with a severely dried panel, and one rib crowned with a non dried panel, both to identical crowns at room EMC, the one with the higher panel compression level will have the steeper spring rate gradient, and will be stiffer. Now correct me if I am wrong.. but I understand this to mean that a CC board will be stiffer, both unstrung... and increasingly so when downbearing is applied. Assuming that is correct, and putting aside all other compression damage discussion for a second or two... I have a question about this long term so called compression set. Given the absolute ideal climatic conditions over many years... would a soundboard subjected to uniform compression set take on a permanent stiffness as a result of that, or is it exactly the woods resistance to being compressed that causes the stiffness ? Seems to me I also read something in one of Johns posts that hinted in this direction. That a CC board <<properly treated>> will eventually be pressed into a very stiff and permanent condition. On the side of this... and please forgive whatever lack of knowledge I display in the asking, if compression from ribs being glued cross grain to the panel is such a problem...even in RB boards.. is there no way of contriving a rib such that it is a bit less constraining ? Just musing again RicB -- Richard Brekne RPT, N.P.T.F. UiB, Bergen, Norway mailto:rbrekne@broadpark.no http://home.broadpark.no/~rbrekne/ricmain.html http://www.hf.uib.no/grieg/personer/cv_RB.html ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/d4/ee/73/80/attachment.htm ---------------------- multipart/alternative attachment--
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