What's all this I hear about Inertia ?

[Fenton Murray]

zzzzzzzzzzzzactly.
  ----- Original Message ----- 
  From: Tom Servinsky 
  To: Pianotech List 
  Sent: Wednesday, October 01, 2008 5:10 AM
  Subject: Re: What's all this I hear about Inertia ?


  And assist springs, even the adjustable,good kind, have never felt as satisfying to me as an action with the ideal hammer weight, action ratio, balance weight, and front weights, and regulated well: by feel, by the "sweet spot," where the action feels its most "buttery" and responsive.

  Amen, David. Bingo! My thoughts exactly.
  Tom Servinsky
    ----- Original Message ----- 
    From: David Andersen 
    To: Pianotech List 
    Sent: Tuesday, September 30, 2008 7:01 PM
    Subject: Re: What's all this I hear about Inertia ?




    On Sep 30, 2008, at 8:46 AM, Fenton Murray wrote:


      If you have heavy hammers, or a high action ratio, or even worse both, you will start to end up with too much lead in the key unless you are using assist springs.

    And assist springs, even the adjustable,good kind, have never felt as satisfying to me as an action with the ideal hammer weight, action ratio, balance weight, and front weights, and regulated well: by feel, by the "sweet spot," where the action feels its most "buttery" and responsive.
    On a well-made action that sweet spot falls within very narrow parameters of distance and weight. Here are some of my ideal parameters:
    -action ratio: 5.5-5.7
    -balance weight: 37-39
    -blow distance: 46mm MINIMUM - 48mm
    -key travel: 10.2-10.5mm
      These actions are not going to 'feel' right even though they may have great numbers. I don't know any way too measure this easily with weights at the key board, but I have become pretty good at feeling it through all the great mistakes I've made.

    As Erwin says, zzzzactly. You get to a point where your hands, your ears, your feeling sense, your eyes, your perceptions, are the vast and fundamental basis of any diagnosis. It's a quick, intuitive process, ratified and focused by testing with the Stanwood protocols, and it works like magic. When the change is made the client is ecstatic.
    David A. 

      Respectfully,

      Fenton


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