removing key pins

[antares]

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
> 
>