<HEAD> <META content="MSHTML 6.00.2900.2802" name=GENERATOR></HEAD> <BODY> <DIV>Gary,</DIV> <DIV> </DIV> <DIV>I see this as two different questions, both important:<BR></DIV> <DIV>1.) If heating hammer/shank joints to align hammers weakens aliphatic resin glue, will this lead to later failure of the joint or other reduced performance?</DIV> <DIV> </DIV> <DIV>2.) If parts of pianos are glued with aliphatic resin glues under stress (such as compression crowned soundboards or laminated ribs), will they move under heat conditions found in transportation, uncontrolled storage or caused by dehumidifying rods?</DIV> <DIV> </DIV> <DIV>For example, there was a Gulf Coast dealer who regularly had his workers load a truck full of pianos on Fridays and left it to sit in an open parking lot in 100+ degree weather, to be driven away on Monday morning. </DIV> <DIV> </DIV> <DIV>Ed Sutton<BR><BR>-----Original Message----- <BR>From: Gary Mushlin <GARYM@PIANOSERVICE.BIZ><BR>Sent: Mar 29, 2006 1:12 PM <BR>To: ed440@mindspring.com <BR>Subject: Re: [CAUT] Hammer Alignment <BR><BR><ZZZHTML><ZZZBODY style="WORD-WRAP: break-word; khtml-nbsp-mode: space; khtml-line-break: after-white-space">Ed,</DIV> <DIV><BR class=khtml-block-placeholder></DIV> <DIV>Another lesson I learned from this glue failure fact involves leaving an action in my car on a summer day in Kansas. I am much more careful about transporting piano actions to and from my shop. <DIV><BR class=khtml-block-placeholder></DIV> <DIV>Sincerely,</DIV> <DIV>Gary Mushlin, RPT</DIV> <DIV><BR class=khtml-block-placeholder></DIV> <DIV><BR class=khtml-block-placeholder> <DIV><BR class=khtml-block-placeholder></DIV> <DIV><BR class=khtml-block-placeholder></DIV> <DIV><BR> <DIV> <DIV>On Mar 29, 2006, at 10:32 AM, <A href="mailto:ed440@mindspring.com">ed440@mindspring.com</A> wrote:</DIV><BR class=Apple-interchange-newline> <BLOCKQUOTE type="cite"><ZZZMETA content="MSHTML 6.00.2900.2802" name="GENERATOR"> <DIV>Gary-</DIV> <DIV>This is important to know about, for many reasons in piano manufacture!</DIV> <DIV>Perhaps someone on list has some references.</DIV> <DIV>I will try a bench on reheated titebond joints.</DIV> <DIV>Ed <BR><BR><BR>-----Original Message----- <BR>From: Gary Mushlin <BR>Sent: Mar 29, 2006 11:07 AM <BR>To: <A href="mailto:ed440@mindspring.com">ed440@mindspring.com</A>, College and University Technicians <BR>Subject: Re: [CAUT] Hammer Alignment <BR><BR><ZZZHTML><ZZZBODY style="WORD-WRAP: break-word; khtml-nbsp-mode: space; khtml-line-break: after-white-space">I used to heat the glue joint to align hammers, until I found out that Titebond begins to break down at about 120 degrees, and loses half its strength at about 150 degrees. I got this info from a technician named Tom Patten in his class concerning fire damage to pianos. My understanding is he got this information from Franklin, the makers of Titebond. I assume this applies to other glues as well.</ZZZBODY></ZZZHTML></DIV> <DIV><BR class=khtml-block-placeholder></DIV> <DIV>Maybe this isn't enough loss of strength to affect the hammer glue joint significantly, but I'd rather not take the chance. I now twist the shank, as was described in a previous response to this question. If the hammer is too far off to twist the shank, I remove the hammer and reglue with fresh glue.</DIV> <DIV><BR class=khtml-block-placeholder></DIV> <DIV>Sincerely,</DIV> <DIV><BR class=khtml-block-placeholder></DIV> <DIV>Gary Mushlin, RPT</DIV> <DIV><BR class=khtml-block-placeholder></DIV></BLOCKQUOTE></DIV></DIV></DIV></DIV></ZZZBODY></ZZZHTML></BODY>