<!doctype html public "-//w3c//dtd html 4.0 transitional//en"> <html> <body bgcolor="#FFFFFF">   Farrell wrote: <blockquote TYPE=CITE><style></style> I guess then you would have a laminated rib constructed of two laminations with one of the laminations being excessively thick. With laminating, you need at least four or five laminations (at least relating to the dimensions and materials commonly used in rib/cut-off bar/bridge/etc. construction) to get to a state where the laminated assembly will not experience significant springback. A two laminate assembly might have 40% or 50% springback. In your case below, you would have one laminate trying to spring back and the machined one trying to stay in an arc. I think you'd end up with an unpredictable mess! Is it like late at night or something over there? Go to bed - tomorrow will be a better day! Terry Farrell Grin... no.. not late at nite.. early in the morning :) hehe... You know me Terry.. I like to throw these things out there to see what comes back. Some people think, some people try, some get a chuckle and some get mad.. but you never know when a good tidbit of thought comes along. Besides.. its entertaining... at least for me. Cheers and have a nice weekend one and all RicB                       <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">From: <a href="mailto:Richard.Brekne@grieg.uib.no" title="Richard.Brekne@grieg.uib.no">Richard Brekne</a></div> <div style="FONT: 10pt arial">To: <a href="mailto:pianotech@ptg.org" title="pianotech@ptg.org">Pianotech</a></div> <div style="FONT: 10pt arial">Sent: Friday, October 03, 2003 4:38 AM</div> <div style="FONT: 10pt arial">Subject: Re: RC vs CC again</div>   Don wrote: <blockquote TYPE="CITE">Hi Ric, Increasing the height of the ribs on a true C.C. board would seem to me to increase the stress on the board--not reduce it.    </blockquote> Dont remember suggesting it would reduce stress on the board... but I did understand Dels point. But here's a thought down the bunny path to think about... Say you have a pure CC panel already assembled and crowned... and THEN you decide to increase rib height..... and you use machine crowned ribs that match the already existing crown to glue on the the undeside of the existing ribs. Whats the point ??... just musing... :)... for now that is. Cheers RicB -- Richard Brekne RPT, N.P.T.F. UiB, Bergen, Norway <a href="mailto:rbrekne@broadpark.no">mailto:rbrekne@broadpark.no</a> <a href="http://home.broadpark.no/~rbrekne/ricmain.html">http://home.broadpark.no/~rbrekne/ricmain.html</a> <a href="http://www.hf.uib.no/grieg/personer/cv_RB.html">http://www.hf.uib.no/grieg/personer/cv_RB.html</a>  </blockquote> </blockquote> -- Richard Brekne RPT, N.P.T.F. UiB, Bergen, Norway <A HREF="mailto:rbrekne@broadpark.no">mailto:rbrekne@broadpark.no</A> <A HREF="http://home.broadpark.no/~rbrekne/ricmain.html">http://home.broadpark.no/~rbrekne/ricmain.html</A> <A HREF="http://www.hf.uib.no/grieg/personer/cv_RB.html">http://www.hf.uib.no/grieg/personer/cv_RB.html</A>   </body> </html>