[pianotech] Cresendo Punchings was RE: Hammer Blow

[David Love]

Might be a sort of catapult effect.  The more abrupt stopping of the key
while the chain of levers is still engaged catapults the hammer into the
string with a bit more force than it would otherwise.  Someone who
understands the physics of catapults might need want to comment.  Outside my
own ken.  

David Love
www.davidlovepianos.com


-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Jon Page
Sent: Thursday, October 11, 2012 6:14 AM
To: pianotech at ptg.org
Subject: Re: [pianotech] Cresendo Punchings was RE: Hammer Blow

The phenomenon does occur, not always, but your theory is as good as any.
Prove it to yourself. You can demonstrate the effect with changing punchings
(maintaining dip). Turn the Crescendo punching over and the effect is gone,
turn it back and it's there. It's like elfin magic.


 >One thing I would believe possible (not having tested the theory), is that
the differently dense punching produces a different impact noise when the
key >hits it. But while that changes the overall sound, I can't get from
there to "focusing the tone". Jon, can you or can someone else who has also
perceived  >this please explain what happens? Thanks.

-- 
Regards,

Jon Page