[pianotech] re-gluing loose hammer felt

[Delwin D Fandrich]

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.

 

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.



ddf    

 

Delwin D Fandrich

Piano Design & Fabrication

6939 Foothill Court SW, Olympia, Washington 98512 USA

Phone  360.515.0119 - Cell  360.388.6525

 <mailto:del at fandrichpiano.com> del at fandrichpiano.com -
<mailto:ddfandrich at gmail.com> ddfandrich at gmail.com

 

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Dale Erwin
Sent: Monday, February 13, 2012 10:24 PM
To: pianotech at ptg.org
Subject: Re: [pianotech] re-gluing loose hammer felt

 

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. 
===========
 
What are the most likely causes of hammer felt letting go anyway?
Preventable?
 
-Aron-
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