Soundboard question

[David Love]

If you want a lower amount of compression just rib the board at a higher
EMC.  

David Love
davidlovepianos at comcast.net 
www.davidlovepianos.com

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Richard Brekne
Sent: Monday, August 18, 2008 8:43 AM
To: pianotech at ptg.org
Subject: Soundboard question

    How would you "pre-compress" a panel at all and how would you
    control or even know what a 25% compression is?

    David Love


You could pre-compress by simply restricting expansion in all directions 
whilst letting the panel / flitchs take on humidity. By 25 % compression 
set I mean subjecting the thing to enough stress so as to force it into 
compression set so the panel looses 25 % of its original change in 
dimension.  If it lost  1 mm due to drying it would regain only 0.75 mm 
after the process at the original MC.

Its not so much how to go about it I am asking about... as much as 
thoughts on the presumed  benefits of doing so.

Cheers
RicB