Action ratio and knuckle distance

[vince mrykalo]

Is there a formula that uses knuckle dimensions in figuring out AR (action ratio)?  I am not finding it in my notes, and I remember some Stanwood formula that used that knuckle dimension in one of the formulas. 

  From: "David Love" <davidlovepianos at comcast.net>
To: "'Pianotech List'" <pianotech at ptg.org>
Date: Wed, 4 Jul 2007 12:03:41 -0700
Subject: RE: Action ratio and knuckle distance

              Actually, Stanwood’s equation of balance won’t tell you that.  The knuckle hanging is not isolated in the formula.  You have to sample and do a weigh off.  
   
    David Love
davidlovepianos at comcast.net
www.davidlovepianos.com 

  -----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of Farrell
Sent: Wednesday, July 04, 2007 11:47 AM
To: Pianotech List
Subject: Re: Action ratio and knuckle distance
   
    Stanwood's equations of balance would tell you that. Are you familiar with David Stanwood's work?

     

    Terry Farrell

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

    From: vince mrykalo 

    To: pianotech at ptg.org 

    Sent: Wednesday, July 04, 2007 2:03 PM

    Subject: Action ratio and knuckle distance

     

      How do you figure out the change that would occur in ACTION RATIO (AR) if everything remains constant (strike weight, front weight,wippen balance weight, and balance weight) except the knuckle is changed from 16.2 mm to 17mm, on paper, without actually trying it out on the action?

   
          Vince Mrykalo RPT MPT

    University of Utah

     

   






      Vince Mrykalo RPT MPT
  University of Utah
   
  "Minél több a változás, annál nagyobb az állandoság"
   
  The more I learn, the less I know.
   
  www.mrykalopiano.com




       
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