[pianotech] re-gluing loose hammer felt

[Dale Erwin]

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


Dale Erwin RPT-
 Mason & Hamlin/Steinway/U.S pianos
Pre-hung Ronsen hammer sets/Abel parts
Sitka Soundboards & Supplies
WWW.Erwinspiano.com
209-577-8397

 
  





-----Original Message-----
From: atrav27 <atrav27 at att.net>
To: pianotech <pianotech at ptg.org>
Sent: Mon, Feb 13, 2012 6:16 pm
Subject: Re: [pianotech] re-gluing loose hammer felt



----- Original Message ----- 
From: "Wally Scherer" <afinetune at yahoo.com>

It was a Baldwin studio with about 20 hammers half separated. 
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What are the most likely causes of hammer felt letting go anyway?
Preventable?

-Aron-

 
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