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#2158897 - 09/28/13 01:42 AM String load keeping compression crowned board intact  
Joined: Oct 2012
Posts: 932
phacke Offline

Gold Supporter until November 11 2014
phacke  Offline

Gold Supporter until November 11 2014


Joined: Oct 2012
Posts: 932
CO, USA
Hello-

Mr Galassini wrote in a previous message in PW not too long ago that I don't understand at all, so I figured I ask.

I wondered if loosening piano strings would extend the life of a soundboard if the piano was not used (in storage)

Mr Galassini wrote in reply> This is not really possible with a compression crowned board. The load is part of what keeps it intact in the first place.

A concept I do understand is that if the soundboard was made by manipulating MC or by physical stress such that the boards are in compression and the ribs in tension (or any kind of opposing force, it does not matter the direction), that over time, materials creep and built in stress will be relieved. If manipulation of MC was the driver of that force promoting crown, moving to a MC approaching the point at which the ribs were placed would relieve that stress to an extent (I guess) reducing driving force for creep. Still, I don't think that is the main effect that Mr Galassini had in mind. When strings are changed out, the soundboard is not loaded by the strings. Is there some bad effect if the strings minimally load the soundboard for some more extended period of time? Mr Galassini, or anyone if it is known, would you please comment on the statement in bold, above?

Best regards-

Last edited by phacke; 09/28/13 01:52 AM.

phacke

Steinway YM (1933)
...Working on:
J. S. Bach, Toccata (G minor) BWV 915
(and trying not to forget the other stuff I know)
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#2158913 - 09/28/13 03:46 AM Re: String load keeping compression crowned board intact [Re: phacke]  
Joined: Mar 2008
Posts: 9,230
Olek Offline
9000 Post Club Member
Olek  Offline
9000 Post Club Member

Joined: Mar 2008
Posts: 9,230
France
may be the strings only retain the board to deform too much under moisture, that could more easily tend to glue joint problems.

One thing is certain, I prefer whenever I can avoid dismounting the plate, as the stress that build in the instrument is released then and when the plate is re-installed it is not certain that it will be as responsive as it was.

This I noticed with instruments where the plate/case are impacting the tone, it may not be the case when everything there is considered to be neutral and massive.


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I wish to add some kind and sensitive phrase but nothing comes to mind.!

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