No Power Yamaha revisited

[Isaac OLEG]

Hello, all balance raisers !

When screwing the bolts, I believe we give more load towards them ,
that gives a better energy transmission towards the action.

I suspect an equilibrium game we certainly change the center of
gravity of the action doing that, because we change the way it sits
all around and on the middle when played.

That should explain why different actions, even in the same model,
respond differently to this.


AT the same time, the action stack is raised a bit, so the hammer
angle is changing a very little but it is enough to be noticed in the
treble in my opinion.
The strike point is also changed a very little, and of course letoff
is nearer.

If the max raise on a Yamaha is not so large, on a Steinway it clearly
change these last points.

And a Steinway action regulated as this is clearly showing "tension"
in the action (the way it sound when knocked, and the way it act, look
loke a more fast & springy action).

no more ideas , too late (sight !)

Best Regards.

Isaac OLEG


Isaac OLEG

Entretien et reparation de pianos.

PianoTech
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> -----Message d'origine-----
> De : pianotech-bounces@ptg.org
> [mailto:pianotech-bounces@ptg.org]De la
> part de Roger Jolly
> Envoye : lundi 26 mai 2003 18:54
> A : Pianotech
> Objet : Re: No Power Yamaha revisited
>
>
>
> Hi Ed,
>              You raise a very good point, this has been
> swimming in the
> back of my mind.  Perhaps that is why Yamaha uses that
> heavy metal beam to
> mount the pedal lyre.   I wonder what the pressure would be
> at the balance
> rail pin location, on a forte blow. But I would bet is
> several hundred
> pounds per square inch.   Loads in the keybed and trap work
> bearing points
> are very large, since they are concentrated in very small areas.
> Yamaha also has a quite flat glide bolt, ostensibly to
> spread the load better.
>
> Regards Roger
>
>
>
> At 09:48 AM 5/26/2003 -0400, you wrote:
> >Bill writes:
> > >I agree that a good healthy blow will put the frame
> under pressure,
> > >but if the BR doesn't have anywhere to go (because the glides are
> > >contacting the bed),
> >
> >   I have been wondering when somebody is going to mention
> the entrainment of
> >the keybed?  Once the glides are in contact, the action
> cannot move, UNLESS
> >the keybed is not absolutely rigid.  But we know the
> keybed isn't.  This is
> >easily seen by depressing the pedals under a very lightly
> bedded set of
> >glides and
> >observing them to lose contact with the keybed.
> >    So,  the extra power and tone being ascribed to
> heavier loading on the
> >glide buttons may possibly be a function of preload on the
> keybed?  And the
> >observed differences between makes of pianos may be more
> due to the
> >differences
> >between keybed strength than the flexibility of the balance rails??
> >Wondering,
> >Ed Foote RPT
> >www.uk-piano.org/edfoote/
> >www.uk-piano.org/edfoote/well_tempered_piano.html
> >  <A
> HREF="http://artists.mp3s.com/artists/399/six_degrees_of_ton
> ality.html">
> >MP3.com: Six Degrees of Tonality</A>
> >_______________________________________________
> >pianotech list info: https://www.moypiano.com/resources/#archives
>
>
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