Hi, I recall receiving some data from the Bosendorfer factory, that they use to glue their boards at 5% moist (and on crowned ribs). Regards. Isaac > -----Message d'origine----- > De : owner-pianotech@ptg.org [mailto:owner-pianotech@ptg.org]De la part > de Ron Nossaman > Envoye : lundi 1 avril 2002 01:38 > A : pianotech@ptg.org > Objet : RE: Case separation or delamination question > > > >I don't understand why this method is still used, and why not in > conjunction > >with crowned ribs. > > Hi Isaac, > I don't understand why either, other than the compression crowning being > considered "traditional". Rib crowning is a far more predictable and > dependable method. > > > >I guess that gluing on crowned ribs only does not build enough internal > >tension to the board to be very efficient is not it ? > > > >Isaac OLEG > > The panel is still dried down for crowned ribs, just not as much. > Something > around 6%MC, so there is still plenty of compression in the panel. A rib > crowned board is every bit as efficient as a compression crowned board. > More so, in my opinion. > > Ron N >
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