Lightening touch by changing damper timing redux

[Dean May]

Just a little clarification, work=force X distance. It is the force
required to move the mass of the damper lever that causes work to be
done. This force would of course be greater on the planet Jupiter. ;-)

It seems to me that also entering the equation is the amount of inertial
energy of the entire system. If the damper lever is contacted earlier in
the keystroke the system is moving slower and has less inertial energy.
If it contacts later the velocity is also greater at that point and so
is the inertial energy. With the greater inertial energy any force the
system encounters like the damper lever becomes less consequential. 

Consider a 4x4 post in the ground being hit by a car. If the car is only
going 5 mph it will probably stop the car with a pretty good jolt. If
the car is going 150 mph you won't even feel it. 

Dean
Dean May             cell 812.239.3359
PianoRebuilders.com   812.235.5272
Terre Haute IN  47802


-----Original Message-----
From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On
Behalf Of Conrad Hoffsommer
Sent: Thursday, January 19, 2006 7:05 AM
To: Pianotech List
Subject: Re: Lightening touch by changing damper timing redux

The problem, as I see it, is the mixing of "weights" and "actual feels".

Weighing off an action on the bench gives a static weight. Actual feel
is 
dynamic.

The dynamic allows the concept of "work" into the mix. If I recall 
correctly, work is mass x distance. If you delay the damper lift, less
work 
is done since the mass is moved a shorter distance. Since less work is 
done, the feel is lighter.

A note statically weighed off to 52gm which has a key with 7 lead
weights 
will require more work to be done than one which has three weights and a

wippen assist spring.  (greater mass through the same distance) This is 
exaggerated as the force is increased by increasing the speed and 
introducing time into the equation turning it into "power". [mass x 
distance/time.]

This may be simplistic, but it's how I conceptualise it.
YMMV






Conrad Hoffsommer

Every great idea has a disadvantage equal to or exceeding the greatness
of 
the idea.
  -Murphy's Law calendar

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