<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; charset=iso-8859-1"> <META content="MSHTML 6.00.2900.3243" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT face=Arial><FONT size=2><EM>>Why would this be a factor?</EM></FONT> </FONT></DIV> <DIV><FONT face=Arial></FONT> </DIV> <DIV><FONT face=Arial>No, it's got nothing to do with dimensional changes, but rather the rate of glue cure. My understanding (minimal as it is) is that if the wood is too dry it will attract/draw the water out of the glue before it can dry in its proper manner and thus create a weak glue joint - it weakens the glue if the water is extracted too quickly.</FONT></DIV> <DIV><FONT face=Arial></FONT> </DIV> <DIV><FONT face=Arial size=2><EM>>Wouldn't having the bottom lam 90 to the above lam hold a radius better. Like a rib. Why have them close to parallel? </EM></FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial>In this particular case, I'm not sure why Richard Brekne chose to keep them close to parallel. Likely to keep as much stiffness up there as is possible. As far as laminating some crown in the panel, I suspect you are correct that a 90 lam would make things bend easier and have less relaxation with only three laminations. But we were able to place the desired amount of crown in it and I suppose it will make it more stiff.</FONT></DIV> <DIV><FONT face=Arial></FONT> </DIV> <DIV><FONT face=Arial>We should probably ask a designer 'bout this stuff!   ;-)</FONT></DIV> <DIV><FONT face=Arial></FONT> </DIV> <DIV><FONT face=Arial>Terry Farrell</FONT></DIV> <DIV><FONT face=Arial></FONT> </DIV> <BLOCKQUOTE dir=ltr style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV style="FONT: 10pt arial">----- Original Message ----- </DIV> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B> <A title=fmurray@cruzio.com href="mailto:fmurray@cruzio.com">Fenton Murray</A> </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A title=pianotech@ptg.org href="mailto:pianotech@ptg.org">Pianotech List</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, January 30, 2008 9:58 AM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Laminated panels (Farrell)</DIV> <DIV><BR></DIV> <DIV><FONT face=Arial>So I have often wondered about how drying the panel (and ribs????) down to 3.5% MC prior to rib gluing might affect the integrity of that rib-to-panel glue joint when using a water-based glue (hot hide, Titebond, Bolduc, etc.). That's another reason I find more comfort in gluing ribs on at 6 or 6.5% MC (and not drying ribs).</FONT></DIV> <DIV><FONT face=Arial></FONT> </DIV> <DIV><FONT face=Arial>>Why would this be a factor? Because of concern over a dimensional change in wood after glue up, why would water based be a factor. When the wood takes on ambient moisture it attacks the glue?  Can't be. I don't get it. I never heard that. Wood can be damaged by over drying, but if it is controlled and slowly brought down, that's different. Of course the opposite is true, it can't be good to take out a 3.5 panel where I live (66% average ) and let it freak out in a piano glue up.</FONT></DIV> <DIV><FONT face=Arial></FONT> </DIV> <DIV> With the panel laminations nearly parallel, it was pretty much like incorporating a rib directly into the panel.</DIV> <DIV> </DIV> <DIV><FONT face=Arial size=2>>Wouldn't having the bottom lam 90 to the above lam hold a radius better. Like a rib. Why have them close to parallel? I see what's happening at the tail. At first I thought is was an added panel.</FONT></DIV> <DIV><FONT face=Arial></FONT> </DIV> <DIV>Come on down! We'll mix up a pitcher of margaritas and talk piano belly.......</DIV> <DIV> </DIV> <DIV><FONT face=Arial size=2>>I've got a good piano belly.</FONT></DIV></BLOCKQUOTE></BODY></HTML>