[pianotech] FW: what is this?

[David Stocker]

My reading of the German is that he is speaking to freeing up a stuck system. He had a piano that had not been played in a long time, and his sense was that the soundboard, etc., would not move freely until it had gotten used to moving again. Breaking loose the grain. Overcoming “sticktion.” Car engines and suspensions will sometimes act stiff until they are driven a while.

Sounds like loose logic to me, but if he got results, it is worth pondering.

David Stocker, RPT
Tumwater, WA



From: John Formsma 
Sent: Friday, September 30, 2011 05:59
To: pianotech at ptg.org 
Subject: Re: [pianotech] FW: what is this?

Yeah, right. :) I'm not agreeing that you can put energy into a soundboard with a tennis ball. I mean, yeah, you can, but it comes right back out. Just like when a hammer hits a string. Nothing gets stored like in a energy reserve. 

-- 

John Formsma, RPT

Blue Mountain, MS


On Fri, Sep 30, 2011 at 4:18 AM, Gregor _ <karlkaputt at hotmail.com> wrote:

  Here is a cutout of an interview with Stefan Knüpfer about that question:
  Basicaly it says this in English:


  Why to use a tennis ball in a grand?
  Long time no play, piano is like sticked in the mud, it needs energy to move and swing free again. The idea is to put energy into the soundboard not via the action but from above with the aid of a tennisball of a jig saw. It knocks the piano beautyful soft and it gets a free tone.

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