Aha! was flat facts

[antares]

As I tried to say before :

Leave a piano untouched, and pitch will go down over time.
It is because it is a natural way for materials under tension or 
stress, to release that tension over time.
Of course it is a combination of factors, like the deterioration of 
wood and metal and the sound board losing its crown etc, but in the 
end, if untouched, pitch will be down to zero.

friendly greetings
from
André Oorebeek

www.concertpianoservice.nl

"Where music is no harm can be"



On 27-mrt-05, at 22:01, Alan wrote:

> And herein lies the interesting crux of my whole question from the
> beginning: We have guesses, suppositions, and opinions but, apparently,
> really don't know why pianos get flatter and flatter and flatter over 
> time.
> Seems like this question is so basic that experiments would have been 
> done
> long ago and we'd have a definitive answer. And maybe, who knows, some 
> ideas
> for building more stable pianos.
>
> I still go with turning pins, though. There is a natural, sustained 
> tension
> on the pin from the string that would love to turn the thing
> counter-clockwise. Earth tremors, children thudding across the floor, 
> sonic
> booms, moving the piano, and hovering ufo's would all put vibration 
> into the
> system, however briefly, and the pin could jiggle just a a third of a 
> skinny
> hair each time. But over the years ...
>
> Alan R. Barnard
> Salem, MO
>
>
> -----Original Message-----
> From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On 
> Behalf
> Of Ron Nossaman
> Sent: Sunday, March 27, 2005 11:38 AM
> To: Pianotech
> Subject: Re: was flat facts
>
>
>
>> I don't really buy into the "tuning pin turns" theory.
>
> Me either, nor the wire stretching. Music wire doesn't continue to
> stretch over time unless it's tensioned at it's yield point - then
> it stretches, necks down, and breaks.
> Ron N
>
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