LumberJocks

Wood movement

  • Advertise with us

« back to Woodworking Skill Share forum

Forum topic by Mark posted 05-26-2013 03:28 PM 543 views 0 times favorited 5 replies Add to Favorites Watch
View Mark's profile

Mark

473 posts in 697 days


05-26-2013 03:28 PM

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

3935 posts in 2385 days


#1 posted 05-26-2013 03:35 PM

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 (online now)

Dallas

3105 posts in 1210 days


#2 posted 05-26-2013 04:18 PM

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

112525 posts in 2299 days


#3 posted 05-26-2013 04:41 PM

View Mark's profile

Mark

473 posts in 697 days


#4 posted 05-26-2013 05:34 PM

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

-- Mark

View firefighterontheside's profile (online now)

firefighterontheside

5474 posts in 579 days


#5 posted 05-26-2013 05:35 PM

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.

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com

Latest Projects | Latest Blog Entries | Latest Forum Topics

GardenTenders.com :: gardening showcase