<!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 2:34 = PM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Laminated ribs</DIV> <DIV><BR></DIV><FONT face=arial,helvetica><FONT lang=0 = face="Times New Roman" color=#000040 size=2 FAMILY="SERIF"> = <DIV><BR>         </FONT><FO= NT lang=0 style="BACKGROUND-COLOR: #ffffff" face="Times New Roman" = color=#000040 size=3 FAMILY="SERIF"> Those of you who routinely use a laminated = rib. <BR>        <BR>         My question is = are these flat laminated pieces cut with a crown in them or are you crowning the = ribs  in a curved caul. I know this was discussed some time back = but hey I don't recall it. If they're laminated in a curve aren't they indeed = more of a true arched rib (or arched beam) than a solid piece of  spruce = rib stock with a machine cut curve. In the rib glued in a curve the = ribs  the grain is indeed in an arch even if it was made thick enough to cut the = bottom of the rib flat so as it had more material in the middle than on the = ends. With a rib laminated in an arch config. it's also possible to have a = rib of uniform dimension (if thats desireable).<BR>        I don't = know Phil F got me to thinking about that.<BR>   Dale</FONT></DIV><FONT face="Times New Roman" color=#000040></FONT></FONT></BLOCKQUOTE> <DIV><FONT face=arial,helvetica><FONT lang=0 = style="BACKGROUND-COLOR: #ffffff" face="Times New Roman" color=#000040 size=2 FAMILY="SERIF"><FONT = face="Comic Sans MS" color=#000080 = size=3></FONT></FONT></FONT> </DIV> <DIV><FONT face="Comic Sans MS" color=#000080></FONT> </DIV> <DIV><FONT face="Comic Sans MS" color=#000080>In our case the curve = is bent in during the laminating process. I.e., the cauls are made with a curve in = them. </FONT></DIV> <DIV><FONT face="Comic Sans MS" color=#000080></FONT> </DIV> <DIV><FONT face="Comic Sans MS" color=#000080>That curve can be most = anything you want it to be, at least within reason. It does not necessarily have = to be a continuous radius. Ditto the machined rib. Depending on the cutting = template the curve can be whatever you want it to be. </FONT></DIV> <DIV><FONT face="Comic Sans MS" color=#000080></FONT> </DIV> <DIV><FONT face="Comic Sans MS" color=#000080>We press our laminated = ribs with an equal thickness throughout. We then machine them to our desired shape = subsequent to laminating. The soundboard side is just cleaned up--the = caul radius is the rib radius--and we shape the "bottom" side.</FONT></DIV> <DIV><FONT face="Comic Sans MS" color=#000080></FONT> </DIV> <DIV><FONT face="Comic Sans MS" color=#000080>Del</FONT></DIV> <DIV><FONT face="Comic Sans MS" color=#000080></FONT> </DIV> <DIV><FONT face=arial,helvetica><FONT lang=0 = style="BACKGROUND-COLOR: #ffffff" face="Times New Roman" color=#000040 size=2 FAMILY="SERIF"><FONT = face="Comic Sans MS" color=#000080 = size=3></FONT></FONT></FONT> </DIV> <DIV><FONT face=arial,helvetica><FONT lang=0 = style="BACKGROUND-COLOR: #ffffff" face="Times New Roman" color=#000040 size=2 FAMILY="SERIF"><FONT = face="Comic Sans MS" color=#000080 = size=3></FONT></FONT></FONT> </DIV> <DIV><FONT face=arial,helvetica><FONT lang=0 = style="BACKGROUND-COLOR: #ffffff" face="Times New Roman" color=#000040 size=2 FAMILY="SERIF"><FONT = face="Comic Sans MS" color=#000080 size=3></FONT> </DIV> <DIV style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; = BORDER-LEFT: #000080 2px solid; MARGIN-RIGHT: = 0px"><BR></DIV></FONT></FONT> <DIV><FONT face=arial,helvetica><FONT lang=0 = style="BACKGROUND-COLOR: #ffffff" face="Times New Roman" color=#000040 size=2 FAMILY="SERIF">     = </FONT></FONT></DIV></BODY></HTML>