<html> At 10:44 PM 4/26/2002 -0700, you wrote:<br> <blockquote type=cite cite>  <dl> <dd>----- Original Message ----- <dd>From:</b> <a href="mailto:Erwinspiano@AOL.COM">Erwinspiano@AOL.COM</a> <dd>To:</b> <a href="mailto:pianotech@ptg.org">pianotech@ptg.org</a> <dd>Sent:</b> April 26, 2002 1:28 PM <dd>Subject:</b> Re: Soundboard Installation & MC<br> <br> <font face="arial" color="#000080"> <dd>Ron wrote:</font><font face="arial" size=2 color="#000040"> <dd>    You're still talking about something like 0.003" rim spread from full crown to flat.</font><font face="arial"></font><font face="arial" size=2 color="#000040"> <dd>Dale wrote</font><font face="Times New Roman Greek, Times" color="#000040"> <dd>>>>>I'm not sure I agree with that. I'm about to press up an Stwy L board and  after it's pressed and crowned I'll measure across the bottom from each end of the longest rib and then I personally will sit or stand on  the board on the floor and see how far the rib dimesion expands. Hmm this might be hard to measure but I'm going to try anyway. Maybe I'l just make a mark on the floor at each rib end and visually observe. Ever done this? It seems to me that .003 figure would have to be greater for the crown to completely collapse.</font><br> <br> </dl><font color="#000080">Actually this sounds about right. I figured this out as well for one of the Journal articles I did a couple of years back in which I wrote about this very topic. The difference isn't much. Certainly not enough to qualify the structure as a buttressed arch.</font><br>  <br> <font color="#000080">I've no idea why this idea persists in the face of fairly easily provable facts and reasonably clear logic. Good marketing ideas die hard, I guess.</font><br>  <br> <font color="#000080">Del</font><br> <font color="#000080"></blockquote><br> Isn't it the intention of the CTR to prevent the rim creep? Also, couldn't a beveled rim have been bourne from proper woodworking techniques<br> of mating the surfaces prior to glueing and the PR spin came about as a brainstorm?<br> <br> </font><br> <br> <div>Regards,</div> <br> <div>Jon Page,   piano technician</div> <div>Harwich Port, Cape Cod, Mass.</div> <div><a href="mailto:jonpage@attbi.com" EUDORA=AUTOURL>mailto:jonpage@attbi.com</a></div> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ </html>