Action ratio and knuckle distance

[David Love]

Not in the Stanwood method that I am aware of.  You have to use standard
distance formulas incorporating the three levers as a sum of the key, wippen
and shank.  The Stanwood method uses weight to determine the action ratio.
It is the one drawback as it will not accurately give you an analysis of how
the action will regulate.  To do a thorough action analysis you should
incorporate both distance and weight measurements.  

 

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 vince mrykalo
Sent: Thursday, July 05, 2007 8:29 PM
To: pianotech at ptg.org
Subject: RE: Action ratio and knuckle distance

 

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 <mailto:madvinmryk at yahoo.com>  

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.

 

 <http://www.mrykalopiano.com> www.mrykalopiano.com

  

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