Key Leads and Inertia

[Isaac OLEG]

Yes David , but I've seen a few Boogie or 8 bars music pianists
feeling more at ease on the accelerated action (no advertising) , and
while playing on them, I could feel the preferred velocity of the
system, that give some comfort.
Once the body of the pianist give the necessary force (or weigh) to
have the keys going down, and a little effort is due to give them the
wanted acceleration to play the beat and accents, you can feel a
"preferred velocity" mode where the action is less tiring. Others
action exhibit that to a lesser extend, does not mean it is easier to
control in all modes nowadays.

I was yet persuaded that Steinway engineers where after a Boogie
Woogie instrument ;>)

Besties

Isaac OLEG

Entretien et reparation de pianos.

PianoTech
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94400 VITRY sur SEINE
FRANCE
tel : 033 01 47 18 06 98
fax : 033 01 47 18 06 90
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> -----Message d'origine-----
> De : pianotech-bounces@ptg.org
> [mailto:pianotech-bounces@ptg.org]De la
> part de David Love
> Envoye : vendredi 2 mai 2003 08:49
> A : Pianotech
> Objet : Re: Key Leads and Inertia
>
>
> I'm not an engineer and will have to defer to those who can
> comment on this
> in a more informed way, but your reference to the key
> doesn't change my
> point.  Movement of the key is being resisted by a variety
> of factors the
> would eliminate any significant effects of momentum in key
> travel, or so it
> seems to me.
>
> David Love
> davidlovepianos@earthlink.net
>
>
> > [Original Message]
> > From: Richard Brekne <Richard.Brekne@grieg.uib.no>
> > To: Pianotech <pianotech@ptg.org>; <davidlovepianos@earthlink.net>
> > Date: 5/1/2003 10:59:41 PM
> > Subject: Re: Key Leads and Inertia
> >
> >
> >
> > David Love wrote:
> >
> > > 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
> > >
> >
> > We were talking about the acceleration of the key itself
> David, the
> actions
> > compliance as a whole is a seperate issue, albiet a good
> one. Of course
> > acceleration / or deacceleration occurs through the whole
> key stroke,
> (except
> > perhaps very rarely... what a steady touch tho eh ?). But
> the presence of
> > acceleration does not simply eliminate the affect of any
> momentum, and
> that
> > seems to be what is being said.
> >
> > The applet I sent a link clearly showed that all other
> things being
> equal, a
> > given mass halfway along the key would accelerate faster
> then half that
> amount
> > out at the end for the same downward force.
> >
> > I put 100 grams on the "rope" as it were, and 250 on the
> left side edge
> of the
> > "platform". Then ran the applet first with 250 grams at
> the right side
> edge of
> > the platform, and then 500 grams half way in on the right
> side. This
> resulted in
> > a faster acceleration for the 500 gram configuration. The
> 100 grams
> pulling at
> > the rope is the input force here, and the "platform" is
> the key. Only
> > significant detail missing relative to the inertia
> question isolated from
> all
> > the other stuff thats being mixed in, is the orientation
> of gravity here,
> as the
> > "platform" rotates horizontaly. That however, just takes
> gravity out
> (more or
> > less) of the picture in the demonstration.
> >
> > Its all part of a link to an online physics resource.
> Good for clowns,
> Steinway
> > enthusiasts, and Wissner lovers everywhere :)
> >
> > Cheers
> >
> > RicB
> >
> > I'm off for a weekend of camping. See you all on monday !
> >
> > 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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