<HTML><FONT FACE=arial,helvetica><FONT SIZE=2 FAMILY="SERIF" FACE="Times New Roman" LANG="0">In a message dated 12/17/2002 10:11:24 AM Pacific Standard Time, mfarrel2@tampabay.rr.com writes:<BR>
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<BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px"></FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=2 FAMILY="SANSSERIF" FACE="Arial" LANG="0">Subj: <B>Re: Soundboardcrownpress </B><BR>
Date: 12/17/2002 10:11:24 AM Pacific Standard Time<BR>
From: <A HREF="mailto:mfarrel2@tampabay.rr.com">mfarrel2@tampabay.rr.com</A><BR>
Reply-to: <A HREF="mailto:pianotech@ptg.org">pianotech@ptg.org</A><BR>
To: <A HREF="mailto:pianotech@ptg.org">pianotech@ptg.org</A><BR>
<I>Sent from the Internet </I><BR>
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Terry and all</BLOCKQUOTE><BR>
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</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=3 FAMILY="SERIF" FACE="Times New Roman" LANG="0"> Dave cuts the crown into his ribs (as do many) so that where feasible the thickest part of the rib is under the bridge or near it. This has exceptions ,one of which is in the top treble on the last three or four ribs. If you followed that design to its conclusion in the top ribs the resu;t would be a fat stick on one end as the bridge is within inches of the belly rail at that point. The other is that in the bass end it's also fudged as an average between the tenor and bass. I know this is a common design and I've heard some that sound really fine but can't verify and superiority. I've tried it both ways myself and I'm not personally convinced this is necessary nor attributable to any enhanced tonal performance. A salways its never one thing. <BR>
As to the pneumatic press being the key , the apex (deepest part ) of the appropriate curved rib caul is also positioned under the bridge line location where the rib is thickest.<BR>
I think most techs who cut ribs this way are probably doing it in a type of router set up jig and not typically the type of tables saw jig I'm currently using although as I said I've done it with this jig as well.<BR>
Dale Erwin</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=3 FAMILY="SANSSERIF" FACE="Arial" LANG="0"><BR>
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David Hughes attempts to do this with his pneumatic soundboard press. He describes his press in a Journal article a few years back.<BR>
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Terry Farrell<BR>
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