I wonder if it would be of any value to laminate the ribs themselves, at least with one reinforcing lamination under the area of most pressure? Has anyone tried this? Thump --- Ron Nossaman <RNossaman@cox.net> wrote: > > >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 presume so. > > > >I wonder what, if any, consequences there may be to > this. > > > >Terry Farrell > > Probably nothing you can directly correlate to > something you can hear, > other than a general deterioration of the board. > Which brings up a point > I've wondered about for a long time. Why are ribs > most often feathered like > that, regardless of whether the assembly is > compression or hybrid > compression/rib crowned? No self respecting > structural engineer would > design a controlled deflection load supporting beam > that way. Too high > stress concentration on the ends for the section > profile. Very non-uniform > stress distribution for something that's supposed to > support a substantial > load, perform dependably and last a while. > > Ron N > > _______________________________________________ > pianotech list info: https://www.moypiano.com/resources/#archives __________________________________ Do you Yahoo!? The New Yahoo! Search - Faster. Easier. Bingo. http://search.yahoo.com
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