Reply by cathyb

  • Advertise with us

Posted on why so up tight!?

View cathyb's profile


793 posts in 3270 days

#1 posted 02-11-2011 05:39 PM

Tension wood results from a tree growing under significant mechanical stress. For example, if it somehow survived while growing on the side of a steep hill or exposed to high winds or any situation which forced the compression of the tree fibers. Think of the fibers like a straw. The pressure on those fibers creates a compressive load that forces the fibers to compress and really creates a spring. When those fibers are cut on a saw, the cut releases the stress and it opens up from energy released. It is not common, but it does happen. The thing to remember is that if you have a piece of lumber that is just contemptible and no matter how hard you work to get it milled it just won’t stay flat and it won’t stop twisting- it’s got some tension and stored up and it could come back and bite you. To be sure not all tension wood has so much tension that it will actually hurt you, but you have to be vigilant.
If I can’t cut tension wood into thin strips on my band saw, I toss it. It’s just a shame that I didn’t know that this piece of mahogany was a trouble maker. It was only 14” long, but when it came apart and hit the blade. Those projectiles sure were scary. I found fragments on the other side of my shop and yesterday found one in the wall about six feet behind my saw. That is very scary. I consider myself lucky to have walked away with a cut finger.
Be careful, don’t be spooked, just pay attention to your wood. If it seems more trouble then it’s worth, it just might be. Best of luck to you….........

-- cathyb, Hawaii,

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