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#2158897 - 09/28/13 02:42 AM String load keeping compression crowned board intact
phacke Offline

Gold Supporter until November 11 2014


Registered: 10/18/12
Posts: 878
Loc: 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-


Edited by phacke (09/28/13 02:52 AM)
_________________________
phacke

Steinway YM (1933)
...Working on:
J. S. Bach, Sonata No. 1 in B minor (BWV 1014)

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#2158913 - 09/28/13 04:46 AM Re: String load keeping compression crowned board intact [Re: phacke]
Olek Offline
9000 Post Club Member

Registered: 03/14/08
Posts: 9230
Loc: 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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