> >> >> Hey Dale, >> Then why the mention of the flying buttress, which isn't exactly an edge >> clamp? >> OK though, that's cleared up. > > > > >>>>>>>>Well almost. Is it your opinion that none of the downbearing load is > transfered down our gloriously precrowned rib./board stucture? or is it just > an almost negligable consideration because of the absorption of bearing > force from the panel itself? One thing I didn't say was how stiff these > boards are even when they are being dry fit and pre stressed for bearing. Either you're not saying what you mean, or I'm dense. Correction - I already know I'm dense, but what are you saying? Sure the rim supports the soundboard assembly, regardless of the assembly stiffness, by keeping it and the plate from falling on the floor. The buttress effect, again regardless of assembly stiffness, is so inconsequential as to be functionally meaningless. You're still talking about something like 0.003" rim spread from full crown to flat. You bend a rim more than that just leaning against it, so there's no way it will support board crown as a buttressed arch under the bearing loads the board is subject to. The PSI pressures involved are well beyond the yield point of the spruce even if you did have an absolutely rigid rim - which you don't. -=-=-=-=--==- > > >>>>>>>> This is the false crown measured by piano techs that is mistaken > for real crown values. 1/8" crown on the logest ribs isn't really crown. As > you know this false crown disappears as soon as the board is released from > the rim bevel. Exactly the point. > > >>>>>>>>>You Mean you're not writing it Down dude? > Thanks for the post. Sure I'm writing it down. I tell you guys everything I think I know. It's in the archives, and changes some from time to time. > > My tone woods better than yours any day > >>>>>>>>>>>>Dale>>>>>>>>>>>>> Oh yea? How about in the evening? Ron N
This PTG archive page provided courtesy of Moy Piano Service, LLC