Soundboard drydown for installation, was installation with hide glue

[Erwinspiano at aol.com]

To all concerned
    As Long as my shop humidity isn't above 45 %  I don't bother to dry them 
down before installation.  That way when I  install the plate & recheck 
bearing for the last time I have a board  elevation that resembles real world 
conditions.  Kind a like Goldi-locks  porridge. Not to cold  & not too hot but just  
right.
 To the rest of the discussion about dry down before  installation & 
expanding panels & fit to the rim stuff... it's simply of  little concern. The fact is 
that in a C.C. board will contract & expand  after it is glued in & it will 
be more volitile from a tuning/seasonal point  of view tan other types & is 
born out by our experience.  All  other forms of board construction fluctuate as 
well but much less  so.......... But it doesn't have any thing to do with the 
board expanding &  pressing a gainst the case or not.  This is simply a false 
belief refuted  with solid science & practical observation of experiments such 
as Ron N's  & perhaps others. It's amazing to me how commonly held the 
buttressed arch  theory is.....but then again I once thought so myself.  However...I 
was  badly  mis-informed.
  Regards to all
  Dale
          
 
 
Richard, I'm glad you asked that.  I too wonder why.  Once  the
ribs are
on, I  can't rationalize a benefit to taking the board outside of
the
normal range of (controlled)  workshop humidity for installation
in  the
piano.  Not that I would be surprised to  learn of several good
reasons
for doing so.  I hope you get some interesting  answers.

Mike


 



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