<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 14 (filtered medium)"><style></style></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1>The glue was probably just fine. It’s pretty rare to find glue that is bad from the supplier unless it is past its shelf life. And in a factory that doesn’t really happen.<o:p></o:p><o:p> </o:p>Most likely in the case of Baldwin hammers is either too much or too little heat on the side cauls, too much or too little moisture in the felt, not enough glue applied or—and this happened more often than anyone wanted to admit—glue applied just before the break (or lunch) bell rings and the worker goes off for a 15 or 30 minute break before sliding the layup in the press. <o:p></o:p>ddf    <o:p></o:p><o:p> </o:p>Delwin D Fandrich<o:p></o:p>Piano Design & Fabrication<o:p></o:p>6939 Foothill Court SW, Olympia, Washington 98512 USA<o:p></o:p>Phone  360.515.0119 — Cell  360.388.6525<o:p></o:p><a href="mailto:del@fandrichpiano.com">del@fandrichpiano.com </a>— <a href="mailto:ddfandrich@gmail.com">ddfandrich@gmail.com</a><o:p></o:p><o:p> </o:p>From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On Behalf Of Dale Erwin Sent: Monday, February 13, 2012 10:24 PM To: pianotech@ptg.org Subject: Re: [pianotech] re-gluing loose hammer felt<o:p></o:p><o:p> </o:p>It could be  a number of things and some that are hard to put your finger on. It could be glue quality, or age. Felt is hygroscopic and can absorb excess moisture in humid season prior to glue up if not monitored and could contribute to failure  Inadequate amounts of glue applied to the felt and wood, or removal from the press before the glue adequately set. And,... some times the felt is just dang strong. There is an enormous amount of stretch and pull that the felt can exhibit on the joint especially in the low bass after the felt has been tensioned stretched and compressed onto the molding.    I've talked to Ray Negron/Ronsen and sometimes the reasons are unknown. Certain woods are more problematic too. The Weickert felt is so Strong that we've gone to 2 staples in the low bass mon-chords and it really helps Dale<o:p></o:p><div>Dale Erwin RPT- Mason & Hamlin/Steinway/U.S pianos Pre-hung Ronsen hammer sets/Abel parts Sitka Soundboards & Supplies <a href="http://WWW.Erwinspiano.com">WWW.Erwinspiano.com</a> 209-577-8397 <tt> </tt> <tt>  </tt><o:p></o:p></div><o:p> </o:p><div>-----Original Message----- From: atrav27 <<a href="mailto:atrav27@att.net">atrav27@att.net</a>> To: pianotech <<a href="mailto:pianotech@ptg.org">pianotech@ptg.org</a>> Sent: Mon, Feb 13, 2012 6:16 pm Subject: Re: [pianotech] re-gluing loose hammer felt<o:p></o:p><div id="AOLMsgPart_0_765d1ca5-2fe9-496b-85f6-0a9563c62df4"><pre style='margin-left:36.0pt;background:white'><tt><o:p> </o:p></tt></pre><pre style='margin-left:36.0pt;background:white'><tt>----- Original Message ----- <o:p></o:p></tt></pre><pre style='margin-left:36.0pt;background:white'><tt>From: "Wally Scherer" <<a href="mailto:afinetune@yahoo.com">afinetune@yahoo.com</a>><o:p></o:p></tt></pre><pre style='margin-left:36.0pt;background:white'><tt><o:p> </o:p></tt></pre><pre style='margin-left:36.0pt;background:white'><tt>It was a Baldwin studio with about 20 hammers half separated. <o:p></o:p></tt></pre><pre style='margin-left:36.0pt;background:white'><tt>===========<o:p></o:p></tt></pre><pre style='margin-left:36.0pt;background:white'><tt><o:p> </o:p></tt></pre><pre style='margin-left:36.0pt;background:white'><tt>What are the most likely causes of hammer felt letting go anyway?<o:p></o:p></tt></pre><pre style='margin-left:36.0pt;background:white'><tt>Preventable?<o:p></o:p></tt></pre><pre style='margin-left:36.0pt;background:white'><tt><o:p> </o:p></tt></pre><pre style='margin-left:36.0pt;background:white'><tt>-Aron-<o:p></o:p></tt></pre></div></div></div></body></html>