[pianotech] Best way to change touch on Yamaha Grand

[Joseph Alkana]

OK, thanks for your input. Back to contemplating that key stick with weights
has no effect on inertia when the note is first played. I think Ron's gonna
lose this one.

Joseph Alkana

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of V T
Sent: Wednesday, January 06, 2010 3:53 PM
To: pianotech at ptg.org
Subject: [pianotech] Best way to change touch on Yamaha Grand

I see now what you mean. Sure, reducing the mass of the hammer will reduce
the pressure and therefore friction at the sliding points. Unfortunately, I
have no data or numbers to give you. Under quasi-static conditions there
might be, say, 10 grams of friction involved. Under pressure of acceleration
that must rise, and it will rise in proportion to inertia.
Sorry, but I have never seen any data on what the 10 grams turns into when
you play fff.

Vladan

==========
"I just wondered if reduced sliding friction due to weight reduction in the
action during modification could somehow be expressed as a percentage of
gain when doing these modifications. I.e., the more weight (mass) is
eliminated the more the parts tend to move (more easily?)as friction is
reduced. No? Seems as though a percentage of work done can and is being
expressed by others. Just wondering.

Joseph Alkana"