<!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 6.00.2800.1264" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT face=Arial size=2>I wonder if there is any chance a glue = might have been used that allowed some level of "creep" to the joint - although you = said antique furniture - is it not the case that all that furniture would = have been put together with hot hide glue, and is it not true that hide glue is = considered to be non-creeping?</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Will a panel laminated with Tightbond = potentially allow some creep? Better to use a urea resin formaldehyde two part = adhesive glue that cures glass-hard?</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Terry Farrell</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=sarah@gendernet.org = href="mailto:sarah@gendernet.org">Sarah Fox</A> </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A = title=pianotech@ptg.org href="mailto:pianotech@ptg.org">Pianotech</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, February 13, 2004 = 6:31 PM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Plywood shrinkage??? = Laminated soundboards???</DIV> <DIV><BR></DIV> <DIV><FONT face=Arial size=2>Hi all,</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>My friend and I were examining some = antique furniture, figuring out how we are going to restore it.  I = noticed that many drawer bottoms in several pieces were made of thin plywood and, = further, that the plywood panels were almost universally shrunken by perhaps 1% = of their original size (e.g. 1/4" over a 25" span).  Moreover, the = greater shrinkage seemed to be in width, rather than in length, with regard to = the direction of the grain of the outer veneer.  The drawers weren't = made this way, as the side pieces of the drawers still fit properly, and = the bottoms have shrunken out of their channels.  Either = that, or the original measurements were pretty sloppy, which I = doubt.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>How does this happen?</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Perhaps repeated fluctuation in MC = causes the panel to expand, compress against the drawer sides, and then receed, = whereupon dirt and debris fills the void in the channel?  With each cycle, = the panel is compressed smaller and smaller?</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Or perhaps repeated MC fluctuations = cause the different laminates to play off of each other, somehow causing = longitudinal fiber compression???</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>How???</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>And if I'm not imagining that this is = happening, what are the implications for laminated soundboards?  Perhaps = they don't crack, but do they shrink?  If so, does that not present the same = problem as with a conventional soundboard?</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Just curious.  I don't have any = laminated soundboard type pianos, but I think it's an interesting = question.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Peace,</FONT></DIV> <DIV><FONT face=Arial size=2>Sarah</FONT></DIV> <DIV><FONT face=Arial = size=2></FONT> </DIV></BLOCKQUOTE></BODY></HTML>