Key Leads and Inertia

[Isaac OLEG]

David,
I also always feel a particularity in the touch when assist springs
are used. There is some kind of "assistance " given that the pianist
have to anticipate when playing.
I did not have the opportunity to test with screw regulatables
springs, only using the weight off and a dynamometer to even and
regulate them - not really an easy thing, and probably not very
stable, considering the design of the usual rep springs with their
short arm, and the way they are regulated , installing a kink or
bending the arm, while the coils stay the same.
A good method to recently address the coils should be of some interest
(I know, screws !)

Using them in conjunction with linked whippen/key make sense, but this
arrangement is prone to rebound too easily.

Greetings.

Isaac OLEG

Isaac OLEG

Entretien et reparation de pianos.

PianoTech
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94400 VITRY sur SEINE
FRANCE
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> -----Message d'origine-----
> De : pianotech-bounces@ptg.org
> [mailto:pianotech-bounces@ptg.org]De la
> part de David Love
> Envoye : samedi 14 juin 2003 17:24
> A : Pianotech
> Objet : Re: Key Leads and Inertia
>
>
> I can't comment from real scientific data, but I have never
> liked the feel
> of assist springs when they are tensioned above some
> undetermined amount
> (say, 10 - 15 grams which is typically the level at which
> they are used),
> if at all.  I am suspicious of the disconnect that they
> create between key
> and wippen with the assist spring always pushing the wippen
> away from the
> key.  Any bounce in the hammer off the rest rail (something
> that they also
> contribute to) will enhance this disconnect.  My hypothesis
> is that an
> assist spring will work best when used in conjunction with
> a rocker arm
> capstan arrangement in which the key is directly linked to
> the wippen.
> With an adjustable rep spring, you could easily adjust the
> degree of assist
> by measuring the change in downweight as you tighten the spring.
>
> David Love
> davidlovepianos@earthlink.net
>
>
> > [Original Message]
> > From: Bill Ballard <yardbird@vermontel.net>
> > To: Pianotech <pianotech@ptg.org>
> > Date: 6/14/2003 5:21:01 AM
> > Subject: Re: Key Leads and Inertia
> >
> > We are both paraphrasing the whispers from the great
> unwashed. Can
> > someone on the list comment on the performance shortcomings of
> > springs? Are these shortcomings a direct function of the
> amount of
> > work the springs are doing?
> >
>
>
>
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