[pianotech] PUNCHING TRICK ???

[Barbara Richmond]

Hi Jack, 

I guess the need would be to make more than 1 gram of difference in the touch. ;-) 

Barbara Richmond, RPT 
near Peoria, Illinois 

----- Original Message ----- 
From: JWyatt1492 at aol.com 
To: pianotech at ptg.org 
Sent: Thursday, January 7, 2010 4:53:50 PM GMT -06:00 US/Canada Central 
Subject: [pianotech] PUNCHING TRICK ??? 


Hello to All. 

For the last 50 or so years the punching "Trick" 
has been called " Clipping the Centers ". 

It is not necessary to do any gluing. You clip 
the center rail felt just a little in front of the center 
pin hole then replace the punching, clipped side 
forward. 

It is generally thought this will make about one 
gram difference (lighter) give or take. I use my 
center pin cutter to do this procedure. 

If you can understand the principal of a see-saw 
then you understand the principal of a lever. 

The Herz- Erard action is a group of levers working 
with each other. Five ( 5 ) to be exact. Not 50 
just five. Its really " not " that hard to figure out 
how to change touch knowing the key depth and the 
hammer blow distance. 

You lighten the load, change the fulcrum or reduce 
friction. Maybe one, two or some of all three. You 
do not have to make things complicated unless you 
have " the need ". 

Jack Wyatt 
Dallas, 
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