Adjusting wippen assist springs

[Sarah Fox]

Hi Mark,

I agree!  No argument here!  ;-)

Peace,
Sarah

----- Original Message ----- 
From: "Mark Davidson" <mark.davidson@mindspring.com>
To: "Pianotech" <pianotech@ptg.org>
Sent: Saturday, December 13, 2003 7:22 AM
Subject: Adjusting wippen assist springs


> Sarah,
>
> I don't disagree at all that pianists can feel this stuff.  And if you
assume hammer speed is 1.75"/10mm = 4.45 rather than a
> typical SWR of ~6 the leads become much more significant.  But I think
it's too easy to look at a key that weighs 100-150g and a
> hammer that weighs 10g and assume the key must have much more inertia.
One must also take into account the leverage/relative
> motion.
>
> The standard argument seems to be: if the SW and/or SWR is too high then
we have to add more lead to the keys, and adding more lead
> increases the inertia rendering the action too heavy.  I would argue that
if the SW and/or SWR is too high, then the inertia is
> already too high and the game is already lost - the lead is a much smaller
factor than usually assumed.
>
> Let the tomatoes fly.
>
> -Mark
>
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