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Wood movement

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Forum topic by Mark posted 410 days ago 488 views 0 times favorited 5 replies Add to Favorites Watch
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Mark

365 posts in 558 days


410 days ago

I see a fair number of comments about wood movement. It’s ok to glue up a table top, but not a bread board end. It’s ok to glue stills and rails to table legs (end table) but the top and shelves should be free floating. I assume this has some thing to do with the grain orientation of the individual pieces, but I’m not sure. Would some body please explain the theory. Thank you.

-- Mark


5 replies so far

View TheDane's profile

TheDane

3627 posts in 2247 days


#1 posted 410 days ago

Yes … wood expands/contracts across the grain, not in the direction of the grain. That’s why you can edge glue boards for a table top, for example. If you glue a bread board across the grain, you will have problems. That’s why most bread boards are pinned (using oblong holes in the top) to provide for some movement.

Wood moves, and you cannot stop it.

-- Gerry -- "I don't plan to ever really grow up ... I'm just going to learn how to act in public!"

View Dallas's profile

Dallas

2830 posts in 1071 days


#2 posted 410 days ago

As far as I know, everything expands and contracts. Even steel.
For instance, CA-72, The USS Pittsburgh, a Cruiser built during WWII as designed was 704’ long. After launching at Brooklyn Naval yard and it’s maiden trip to the Mediterranean and on to the south Pacific, was measured at 706’ during it’s time in dry dock to have 104’ of it’s bow reattached after it was broken off during a typhoon.
All expansion because of the warmer conditions of the water and the atmosphere.

What Gerry says is absolutely true.

-- Improvise.... Adapt...... Overcome!

View a1Jim's profile

a1Jim

111999 posts in 2161 days


#3 posted 410 days ago

View Mark's profile

Mark

365 posts in 558 days


#4 posted 410 days ago

Thanks for the input gents. Very informative article Jim. Thank you.

-- Mark

View firefighterontheside's profile

firefighterontheside

3053 posts in 440 days


#5 posted 410 days ago

Wood expands and contracts across the grain, but not so much along the grain. When doing a large glue up such as a table top the movement is amplified. When a large piece expands if one side is held fast then the opposite side moves and the larger the piece the farther that side moves. With rails and stiles, it’s usually only small pieces so the effect of movement isn’t that great and you don’t really have to consider it.

-- Bill M. I love my job as a firefighter, but nothing gives me the satisfaction of running my hand over a project that I have built and just finished sanding.

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