[pianotech] Hammer Line Issue

[PianoCare2]

Why not work out where this problem is coming from..

Press the damper pedal and if the hammers bobble, it isn't the damper
springs.

Play a few test notes with the damper pedal up and then depressed. If there
is a huge difference in resistance, then I would look at the dampers a
little more closely.

Chinese and Korean uprights of the 80's and 90's did have tight springs
(some brands)  however I found that it was a resistance problem and not a
hammer problem.

I have not had any problem with the Kawai or Yamaha uprights...if they are
regulated correctly.

Brian Wilson

 

  _____  

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Farrell
Sent: Monday, 11 May 2009 9:44 PM
To: Ed Sutton; pianotech at ptg.org
Subject: Re: [pianotech] Hammer Line Issue

 

"What is the likelihood that the piano had overly strong damper flanges,
un-noticed for 22 years?"

 

IMHO: high liklihood. I've serviced a number of Asian pianos that were 20
years old with this affliction. Bobbling hammers? I've seen hammers bobbling
so bad that I couldn't even tune the piano - piano owner never noticed. Some
aren't even bothered with bobbling hammers after you point it out to them!

 

Terry Farrell

----- Original Message ----- 

 

Here's Matthew's first post:

 

>I went to tune a clients piano today.  It is a Kawai Console, year 1986.
 
>The very first thing I noticed was the hammer line was totally screwed up.
Some of the hammers were resting on the rail, and others were off the >rail.
I unscrewed the action bracket nuts and pulled the action back a little
until all the hammers were resting on the rail. "

 

What is the likelihood that the piano had overly strong damper flanges,
un-noticed for 22 years ?  The customer didn't complain of bobbling hammers.
That problem occurred after Matthew adjusted the capstans and let-off. We
are into the second or third stage of treatment without diagnosis.

 

ES
 

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