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Dave Chandler
Super Member
Joined: 31 Oct 2007
Posts: 691
Location: Mt Mitchell in North Carolina
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 Posted: Wed Sep 29, 2010 10:00 pm Post subject: UV tanning |
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Michael, you're correct, we don't know what causes the rise in the tone, whether it be the drying effect or the UV itself.
I'm also of the mind that if you closely control your arching, graduations, bassbar shape, and outline form, the tone will come.
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Dave in the Blue Ridge
Southern Violin Association
"Success is the ability to go from one failure to the next with no loss of enthusiasm" Winston Churchill
"I took the road less travelled, and now I don't know where I am." Marco Polo |
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Michael Darnton
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Joined: 23 Mar 2007
Posts: 1347
Location: Chicago
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byacey
Member
Joined: 29 Mar 2008
Posts: 105
Location: Edmonton, Alberta
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| Posted: Thu Sep 30, 2010 12:31 pm Post subject: Re: UV box |
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| Dave Chandler wrote: | | Michael, if this were true, then why do we dry wood to 7% before we begin work on it then set it loose in 40-75% humidity to live out its life? |
You want dry, stable wood that isn't going to move while drying, and as a result warp or crack. Just because the wood is exposed to 40-75% relative AIR humidity doesn't mean the wood will take on this same percentage of moisture. Wood and it's ability to take on and hold water isn't the same substance as air.
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Bill |
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Lemuel
Site Admin
Joined: 12 Aug 2010
Posts: 515
Location: Mt. Elgin, Ontario
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| Posted: Thu Sep 30, 2010 10:39 pm Post subject: |
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| Quote: | | Just because the wood is exposed to 40-75% relative AIR humidity doesn't mean the wood will take on this same percentage of moisture. |
Bill,
How can you be sure? I have most definitely seen the effects of humidity on wood. In summer of higher humidity, wood tends to swell somewhat and in the winter it shrinks. Can you elaborate? |
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Chad48309
Member
Joined: 26 Sep 2010
Posts: 110
Location: Michigan
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| Posted: Thu Sep 30, 2010 10:51 pm Post subject: |
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| Lemuel wrote: | | Quote: | | Just because the wood is exposed to 40-75% relative AIR humidity doesn't mean the wood will take on this same percentage of moisture. |
Bill,
How can you be sure? I have most definitely seen the effects of humidity on wood. In summer of higher humidity, wood tends to swell somewhat and in the winter it shrinks. Can you elaborate? |
I believe he means that you can't be sure the entire sample of wood has taken on the exact same percentage of humidity (down to its core) since the level of humidity is based on what's in the air and not the moisture the actual wood has already absorbed.
At least, that's the best I can parse it. It doesn't make a great deal of sense to me, either. Simply because your hygrometer is measuring based on the humidity level of the air doesn't mean it's not an accurate scale to go by. Unless you're dealing with an incredibly dense and poorly-cured wood sample.
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Andres Sender
Super Member
Joined: 23 Mar 2007
Posts: 275
Location: N. CA
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| Posted: Mon Oct 04, 2010 1:16 am Post subject: |
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Those of you for whom this humidity/moisture content issue isn't making sense need to learn how to use the internet, seriously.  This is basic woodworking information!
Ambient humidity and wood moisture content are related, but the numbers are NOT THE SAME. There is a brief explanation and a calculator here so you can see the difference in concrete terms:
http://www.csgnetwork.com/emctablecalc.html
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You can only connect the dots that you have. |
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Mat Roop
Senior Member
Joined: 24 Mar 2007
Posts: 911
Location: Wyoming Ontario
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| Posted: Sat Oct 16, 2010 10:38 pm Post subject: |
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| Andres Sender wrote: | | ... need to learn how to use the internet, seriously. ..... |
But it is so much easier when you find the best info for us 
Thanks Andres... great link. Your posts are always great and always save me so much time.
Cheers, Mat |
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Andres Sender
Super Member
Joined: 23 Mar 2007
Posts: 275
Location: N. CA
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| Posted: Mon Oct 18, 2010 2:06 am Post subject: |
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Glad to know it Mat, thanks for the kind words. 
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