[pianotech] Action Ratio sidebar

[paulrevenkojones at aol.com]

Will:
 
This is a real practical application of what would otherwise be more  
theoretical than anything else (no less interesting, but daunting to those who  
are not used to the lever arm analysis and action ratio concept). 
 
I will look forward to what you experience in real regulation as you do  
this. Please let us know.
 
Paul
 
 
In a message dated 1/7/2010 10:26:23 P.M. Central Standard Time,  
pianoguru at cox.net writes:

I did that in the design of a new model.  We  built one prototype with 
taller wippen heels for the sharps.   The  "production" folks overrode me.  It 
added more to the cost than it was  worth .... to them.  I still think it is 
a good idea.  Go for  it!
 
Frank Emerson

----- Original Message ----- 
From:  _William Truitt_ (mailto:surfdog at metrocast.net)  
To: _pianotech at ptg.org_ (mailto:pianotech at ptg.org)  
Sent: Thursday, January 07, 2010 10:17  PM
Subject: [pianotech] Action Ratio  sidebar



I’ve been following the ongoing discussion about action  ratios with 
interest.  Yesterday I had need to visit the Wessell,  Nickel, and Gross website, 
and noticed something interesting in the Half  Stroke article listed under 
what’s new.  As all of you know, the magic  (half stroke) line for the 
naturals will not be the same for the  sharps because the distance from the sharp 
balance rail pin to the capstan  is less than that of the natural.  WNG 
recommends using a capstan heel  that is 2 mm thicker than that for the natural –
 if the natural capstan heel  is 19 mm, then you use a 21 mm for the 
sharps.  This way both naturals  and sharps can be properly set up and observe the 
half stroke line.   This is easily accomplished because the WNG repetitions 
are modular, with  the capstan heel a separate piece that is glued into the 
bottom of the rep  lever, and there are many sizes available.   
Today when I called I was told that the reps normally  ship with only one 
kind of heel, but that they will make the substitution  for the sharps on 
request.  I’ve got a Steinway A that I am setting the  action up on now, and 
will use this setup.   It will be  interesting. 
Will Truitt 


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