Key Leads and Inertia

[David Love]

It seems to me that because everything resists being moved (inertia) that
acceleration probably takes place through the entire key stroke.  I would
guess that the first mm of movement doesn't achieve much for the reasons
that have been  discussed, namely the flexing, compacting of various parts.


David Love
davidlovepianos@earthlink.net


> [Original Message]
> From: Richard Brekne <Richard.Brekne@grieg.uib.no>
> To: Pianotech <pianotech@ptg.org>
> Date: 5/1/2003 4:01:16 PM
> Subject: Re: Key Leads and Inertia
>
> Hmmm how to make this point..
>
> John Hartman wrote:
>
> > Excuse me if am not understanding what you have written. You keep
> > talking about momentum and I don't see much in the way of momentum
> > taking place in the action. Things are accelerating and decelerating
> > they are not just smoothy coasting along with constant speed....
>
> If you have a key accelerated to a certain speed in the first mm of key
> travel, it takes very little energy to keep it there... momentum...
fine....
> Seems to me that when the key is engaged in most cases that the greatest
> portion of its end velocity is reached within the first mm or so of key
> travel. From that point on to the point where the key bottoms out on front
> cushion, most of the work is already done, and the inertia of the key
helps to
> keep it that way.... no ?? So you may loose in the first ms, but you win
the
> rest of the way through.... or what ?
>
> RicB
>
> --
> Richard Brekne
> RPT, N.P.T.F.
> UiB, Bergen, Norway
> mailto:rbrekne@broadpark.no
> http://home.broadpark.no/~rbrekne/ricmain.html
>
>
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