removing key pins

[Isaac OLEG]

Sure, they get smaller, only black holes in space can grow with low
H.R. level.

Even, if the demonstration with the hole in a plank makes sense, the
reason is probably because there is more wood around the hole than in
a flange, or even in a key.

Beside, the reaction of the wood or any material if restricted to grow
and swell is different than a simple hole in a simple plank.

The bushings are blackened by little jokers, very small, that go in
the pianos when we don't look at it closely, that is what we call
"black work".


Friendly regards.

Isaac , back to space age.


> -----Message d'origine-----
> De : owner-pianotech@ptg.org
> [mailto:owner-pianotech@ptg.org]De la part
> de an tares
> Envoye : vendredi 6 septembre 2002 15:39
> A : pianotech@ptg.org
> Objet : Re: removing key pins
>
>
> Conrad, the hole always gets smaller when humidity is too
> high. How else
> could keys get stuck when they are exposed for a longer
> time to humid
> condition and why else are the bushings blackened by the pins.
> When it is dry the wood shrinks but the bushings expand so
> the opposite
> takes place.
> The way the wood expands depends on the grain.
>
> Holland is a very humid place for piano's, so all piano's
> coming from all
> factories have sticking keys after a few months.
> reaming the key holes helps immediately which proves that
> the holes got
> smaller because of the humidity.
>
>
> friendly greetings
> from
>
> Antares,
>
> Amsterdam, Holland
>
> "where music is, no harm can be"
>
> visit my website at :  http://www.concertpianoservice.nl/
>
>
> > From: Conrad Hoffsommer <hoffsoco@luther.edu>
> > Reply-To: pianotech@ptg.org
> > Date: Fri, 06 Sep 2002 08:17:28 -0500
> > To: pianotech@ptg.org
> > Subject: Re: removing key pins
> >
> > Friends,
> >
> >
> >>> "Holes in wood get smaller as humidity goes down..."
> >
> > I don't think so.
> >
> >>> I have heard this before. Believe me, I am not trying
> to start an
> >> arguement - just trying to understand. If a hole gets
> smaller, then why do
> >> tuning pins get more loose with lower humidity?
> >
> >
> > I always thought that the wood shrinks away from a
> surface, or to put it
> > another way, towards the center of itself.
> >
> > ...so...
> >
> > If you have a hole in the center of a chunk of wood the
> center isn't there
> > anymore. The wood would shrink towards a line halfway
> between the surface
> > of the hole and the outside of the chunk of wood (or
> another hole) - thus
> > making the hole larger.
> >
> >
> > Am I as confused as usual about this, or more?
> >
> >
> >
> > Conrad Hoffsommer PTG RPT, MPT, CCT
> >
> > Certified Calibration Technician (CCT) for Bio-powered
> Digitally Activated
> > Lever Action Tone Generation Systems
> >
> >
>
>