soundboard stresses

[Erwinspiano@aol.com]

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In a message dated 10/13/2003 10:02:04 PM Pacific Daylight Time, 
pianobuilders@olynet.com writes:


In a message dated 10/13/2003 6:32:31 PM Pacific Daylight Time, 
Erwinspiano@aol.com writes:
     Ron
     I don't know & ...I don't know but I thought I just read on this list 
recently that John Patton Of S&S is now stating that their boards are now being 
pressed at 5.5% EMC. To me this would yield a fairly amount of crown in the 
rehydrated panel. To achieve this level for sure takes a well set up box & 
regular monitoring.
  I meant to say "yield a fairly small amount of  crown."  Duh!--Dale

But pressed into curved cauls. The effect on the soundboard panel is the same 
as if it were pressed at a somewhat lower MC.

Del
   I'm assumning you're speaking of simply stretching the panel since spruce 
does seem to have quite an ability to flex across grain. Even so it seems that 
it would have to be a fairly steep caul to make much difference. Just holding 
small left over pieces of board in hand and bending them into tight radii to 
see how much they'll bend before breaking is one of my personal favorite 
recreational shop sports. We all take turns and keep score & the loser gets to buy 
lunch.     
     Any one have an idea as to the config. of curved cauls at S&S? Is there 
anyway to ask
  It doesn't matter . just curious---Dale

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