<HTML><FONT FACE=arial,helvetica><FONT SIZE=3 FAMILY="SERIF" FACE="Times New Roman Greek" LANG="0">.</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=2 FAMILY="SANSSERIF" FACE="Arial" LANG="0"><BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px"><BR>
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----- Original Message -----<BR>
From: "Farrell" <mfarrel2@tampabay.rr.com><BR>
To: <pianotech@ptg.org><BR>
Sent: February 17, 2002 6:34 AM<BR>
Subject: Pneumatic Press Bending<BR>
. </FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=2 FAMILY="SANSSERIF" FACE="Arial" LANG="0"></BLOCKQUOTE><BR>
<BR>
</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=3 FAMILY="SERIF" FACE="Times New Roman Greek" LANG="0"> </FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=2 FAMILY="SANSSERIF" FACE="Arial" LANG="0">Diito that Del 40to 45 lbs. pressure. Above 60 is scary.<BR>
>>>Dale</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=2 FAMILY="SANSSERIF" FACE="Arial" LANG="0"><BR>
</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=2 FAMILY="SANSSERIF" FACE="Arial" LANG="0"><BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px"><BR>
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I tested a bunch of different pressures with rib-to-soundboard joints a few<BR>
years back. Below about 30 lbs the failure was predominately glue failure<BR>
from thick glue joints. Above 70 lbs or so (I don't remember the exact<BR>
figures) the failure was primarily due to starved glue joints. The strongest<BR>
adhesive bonds resulted from pressures between about 40 lbs and 60 lbs where<BR>
the predominate failure was with the wood. We use between 40 and 45 lbs in<BR>
our press.<BR>
<BR>
Del<BR>
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