[pianotech] Breaking Kawai treble strings

[Paul T Williams]

I'm interested in this too, Daniel,

One piano professor has 2 Steinway B's from the 70's that both break 
strings about as frequently.  I put new hammers on one, but that did 
nothing except sound better again; I'm considering the restringing and 
capo shaping, but if someone out there has the "fix" that is NOT 
restringing, I'd love to hear.

Paul




From:
"bergpiano" <dan at bergpiano.com>
To:
<pianotech at ptg.org>
Date:
02/22/2011 08:10 AM
Subject:
[pianotech] Breaking Kawai treble strings



I have a customer with a Kawai GS-70. After it arrived about three years 
ago treble strings started to break while playing, about once every 2 to 3 
weeks. I talked to Kawai techs and decided to restring the capo section. I 
used Kawai's stringing chart for decimal wire and sanded the capo to shiny 
smooth. I also filed the hammers. After a short while strings started to 
break again every month or two. Now they are breaking about one every 2 to 
6 weeks. The breaks have always been at the capo. 
 
What am I overlooking?
I would not say the players strike overly hard. It is in a private school. 
Students and teacher (mostly teacher) have broken wire. Classical music. 
Could hammer position have a bearing here? Hammers are original.
Regulation? 
I need some brainstorming here!
 
Many thanks,
 
Daniel Berg RPT

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