Wood MC Puzzle

[Erwinspiano@aol.com]

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In a message dated 11/28/2002 8:35:31 AM Pacific Standard Time, 
RNossaman@cox.net writes:


> Subj:Re: Wood MC Puzzle 
> Date:11/28/2002 8:35:31 AM Pacific Standard Time
> From:<A HREF="mailto:RNossaman@cox.net">RNossaman@cox.net</A>
> Reply-to:<A HREF="mailto:pianotech@ptg.org">pianotech@ptg.org</A>
> To:<A HREF="mailto:pianotech@ptg.org">pianotech@ptg.org</A>
> Sent from the Internet 
> 
> 
>           Terry

                     I think those kind of unnaturally high temperatures are 
generally reserved for a forest fire just before the wood burst into flame or 
maybe for a good wood roasted barbeque. 
     I've done some of this artificial drying and I didn't find it very 
useful  and that was with new spruce. I think the efficacy /reliability of 
the wood cells is permanately altered. Perhaps a better indicator of wood 
dryness for determing soundboard EMC would be to take a piece of new spruce 
and dry it your box to a very low say 4%. Let it live there for 3-4 days . 
Weigh it till your convinced it's bottomed out. Then let your emc levels rise 
to 6 ,8 and 10% respectively, logging the weights in each range. This is 
where our soundboard emc levels fluctuate in the real world. and will tell 
you what imho what you're after.
  If I recall correcctly wood takes on moisture 7 times faster than it is 
willing to give it up. So be patient. Also I have a nice scale but I find 
that it needs to warm up about 15 minutes before it reads consistently 
otherwise it reads about ,2 tenths light. Sheesh technology.
             Dale Erwin

> 
> >
> >Anybody have and great ideas of why the wood seems to be staying dryer 
> >after the cooking process? Is 250EF too hot - has it changed the wood 
> >somehow so that it can't hold as much water? It looks the same. What is 
> >going on? Anyone know a professor of wood technology?
> >
> >Terry Farrell
> 
> Before too many tiny smoke producing demons show up to further confuse 
> things, I'd suggest starting with wood that hasn't been cumulatively 
> crushed by string loads and humidity extremes for 100 years. You might get 
> different results. If not, at least you'll have two sets of demons for 
> comparison and conformation.
> 
> Ron N
> 


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