<!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 6.00.2800.1106" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT face="Comic Sans MS" color=#000080></FONT> </DIV> <BLOCKQUOTE style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; = BORDER-LEFT: #000080 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=Erwinspiano@aol.com href="mailto:Erwinspiano@aol.com">Erwinspiano@aol.com</A> </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A = title=pianotech@ptg.org href="mailto:pianotech@ptg.org">pianotech@ptg.org</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> August 17, 2003 8:18 = PM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Laminated = ribs</DIV> <DIV><BR></DIV><FONT face=arial,helvetica><FONT lang=0 = face="Times New Roman" color=#000040 size=2 FAMILY="SERIF">In a message dated 8/17/2003 = 6:50:14 PM Pacific Daylight Time, <A href="mailto:RNossaman@cox.net">RNossaman@cox.net</A> = writes:<BR><BR> <BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px = solid; MARGIN-RIGHT: 0px" TYPE="CITE"></FONT><FONT lang=0 style="BACKGROUND-COLOR: = #ffffff" face=Arial color=#000000 size=2 FAMILY="SANSSERIF">You're right, sorry. = Either would work. I don't recall ever hearing of <BR>anyone cutting curved = laminations, but it seems an awful lot of unnecessary <BR>time and trouble when = you can just bend them.<BR><BR>Ron N<BR></BLOCKQUOTE></FONT><FONT lang=0 style="BACKGROUND-COLOR: #ffffff" face="Times New Roman" = color=#000040 size=2 FAMILY="SERIF"> <DIV><BR> </FONT><FONT lang=0 style="BACKGROUND-COLOR: = #ffffff" face="Times New Roman" color=#000040 size=3 FAMILY="SERIF">      I agree. Also as I = recall the whole idea behind curved laminated ribs is to produce a more uniformly = strong rib or in other words something where strength calculations are more predictable If that's the case then how many laminations is desireable = in a rib say 24 to 28 mm tall?  3mm is about all most planers will = squeeze down to so seems that 4 or 5 laminations of  5 or 6 mm would be = all thats practical. So far in the few sets I've done I think I've used 4 to 5 laminations.<BR>     Dale</FONT></DIV> <DIV><FONT face="Times New Roman" = color=#000040></FONT> </DIV></BLOCKQUOTE> <DIV><FONT face="Comic Sans MS" color=#000080>We always use a = minimum of 5 laminae per rib. The bottom laminae, i.e., the one opposite the = soundboard side, is generally thicker to allow for milling to height, shaping, = etc.</FONT></DIV> <DIV><FONT face="Comic Sans MS" color=#000080></FONT> </DIV> <DIV><FONT face="Comic Sans MS" color=#000080>There is a good = overview of glued, laminated beams in The Wood Handbook, Chapter 11. Look for the part on <STRONG>Glulams</STRONG>. This book is available online (your tax = dollars at work!) at:</FONT></DIV> <DIV><FONT face="Comic Sans MS" color=#000080><A href="http://www.fpl.fs.fed.us/documnts/FPLGTR/fplgtr113/fplgtr113.htm"= >http://www.fpl.fs.fed.us/documnts/FPLGTR/fplgtr113/fplgtr113.htm</A></FO= NT></DIV> <DIV><FONT face="Comic Sans MS" color=#000080>Click on Chapter 11 = and download a pdf file with the whole chapter. If you refer to this work as much as I = do you might want to download the whole book. It's not free but you've already = paid for it.</FONT></DIV> <DIV><FONT face="Comic Sans MS" color=#000080></FONT> </DIV> <DIV><FONT face="Comic Sans MS" color=#000080>The stuff described in = the book is intended for architectural use, but the principles apply.</FONT></DIV> <DIV><FONT face="Comic Sans MS" color=#000080></FONT> </DIV> <DIV><FONT face="Comic Sans MS" color=#000080>Del</FONT></DIV><FONT = lang=0 style="BACKGROUND-COLOR: #ffffff" face="Times New Roman" = color=#000040 size=3 FAMILY="SERIF"></FONT></FONT> <DIV><FONT face=arial,helvetica><FONT lang=0 = style="BACKGROUND-COLOR: #ffffff" face="Times New Roman" color=#000040 size=3 FAMILY="SERIF"></FONT></FONT> </DIV> <DIV><FONT face=arial,helvetica><FONT lang=0 = style="BACKGROUND-COLOR: #ffffff" face="Times New Roman" color=#000040 size=3 FAMILY="SERIF"></FONT></FONT> </DIV> <DIV><FONT face=arial,helvetica><FONT lang=0 = style="BACKGROUND-COLOR: #ffffff" face="Times New Roman" color=#000040 size=3 FAMILY="SERIF"></FONT></FONT> </DIV> <DIV><FONT face=arial,helvetica><FONT lang=0 = style="BACKGROUND-COLOR: #ffffff" face="Times New Roman" color=#000040 size=3 FAMILY="SERIF">      = </FONT></FONT></DIV></BODY></HTML>