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wood movement 101

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Someone on social media posted a photo of a desk top he'd just made and was wondering about a finish.  My first impression (after working on a number of pieces of furniture that failed due to wood movement) was that this thing was going to blow apart in just a couple years.  Unless, of course, it's veneered and not solid wood, that it appears to be.  

image.png.0253edf12a50ba00ef2a1f902a6d7b52.png

 

Experience is a dear teacher, but fools will learn at no other. - Benjamin Franklin

  • Author

Taking bets.   I've got August.

 

Nice job but a bit of sobbing is in their future.  Clear coat on all sides at a body shop might be best bet.

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We make them all the time...

 

20160721_121021.jpg

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30 minutes ago, BillyJack said:

We make them all the time...

 

20160721_121021.jpg

But all your grain here is going the same direction.  Only the finish is diagonal.

 

1 hour ago, kmealy said:

But all your grain here is going the same direction.  Only the finish is diagonal.

 

 

 

Now look at the one to the left... We made these tables for years but we had a customer that wanted something cheaper do we made a sample with just a variety of finishes..

 

angles1.JPG

Edited by BillyJack

Sad backwards is "DAS", and das is not good.

  • Author

Doing some math:

From the looks of it, it's maybe 3' x 8'.  So roughly, all the perpendicular sections are 3' wide.

 

Given some of the reference material I could find, with a 3% moisture variant, that section will move about 3/16" to 9/32" (a little over 1/4") while the perpendicular pieces will not move at all.  This depends on species and grain orientation (flat-sawn or quarter-sawn).  Most of the pieces look primarily flat sawn to me.

 

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwjWmuKw14L2AhVkk4kEHdRsBXYQFnoECBcQAQ&url=https%3A%2F%2Fcdn.popularwoodworking.com%2Fwp-content%2Fuploads%2F2010%2F10%2FWoodMovement.pdf&usg=AOvVaw3ngfWQ0f9VwFln3hJdvXSI

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwi8kbyW14L2AhWSlokEHZDvCMUQFnoECAQQAQ&url=https%3A%2F%2Fwww.fpl.fs.fed.us%2Fdocumnts%2Ffplgtr%2Ffpl_gtr190.pdf&usg=AOvVaw09khYfzeQX3vg2SG_FG5yk

Beautiful but a train wreck on the tracks.  Our local fire department had a guy (now deceased) build a large table jam packed with intricate parquets depicting fire fighting logos.  Then he tried to pour epoxy over it.  The chief wanted me to try to polish the epoxy to save it but the parquet glue joints started to separate.  It hacked the chief off but I wouldn’t touch it.

 
I’m with Keith on this one.  End of summer.

I'll just call it limited education by those who don't know..

 

Only fact here is there made, warranted and there has never been a call back..

Edited by BillyJack

Depends [like most things].  Original post didn't mention final location of the product.  Here in AZ, and a lot of West/SW, moisture (particularly indoors) doesn't vary that much, and dimensions stay pretty stable.  OTOH, someone gave me a keepsake box made from redwood, made out of state, and the lid curled back about 60 degrees within a few weeks.  Luck is not a strategy, but sometimes it happens.

  • Author
28 minutes ago, PeteM said:

Depends [like most things].  Original post didn't mention final location of the product. 

NE Ohio

Edited by kmealy

3 hours ago, kmealy said:

NE Ohio

Oh, hell, kiss it goodbye!  Maybe.  

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