Key Leads and Inertia

[Paul McCloud]

John:
	I fail to see what this has to do with real-world dynamics.
Since the lead is integral with the keystick, not suspended by a thread,
the inertia is going to be the same no matter how much acceleration is
generated by the pianist's finger.  What am I missing?  
	Paul McCloud
	San Diego

-----Original Message-----
From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On
Behalf Of John Hartman
Sent: Thursday, April 24, 2003 3:49 PM
To: Pianotech
Subject: Key Leads and Inertia

List,

Continuing with the discussion about even balance 
weight verses even inertia I have another 
contribution. Actually a clarification of a 
comment I made before. Please see the illustration 
on the technicians page of my web site.

[link redacted at request of site owner - Jul 25, 2015]

I think this will show what I meant when I said 
that the key leads help when you play softly but 
hinder when you play at louder dynamics. I got 
started thinking about this a few years ago after 
seeing a class given by Bob Holf. He described an 
experiment he did using a large scale key model. 
The gist of the experiment was to discover how the 
key reacted to varying force. The key's 
acceleration as measured revealed the influence of 
inertia.

John Hartman RPT

John Hartman Pianos
[link redacted at request of site owner - Jul 25, 2015]
Rebuilding Steinway and Mason & Hamlin
Grand Pianos Since 1979

Piano Technicians Journal
Journal Illustrator/Contributing Editor
[link redacted at request of site owner - Jul 25, 2015]


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