|Project by stanley2||posted 06-26-2008 10:29 PM||4583 views||8 times favorited||12 comments|
I’ve been air-drying rough cut green lumber for many years with my shop-made fixture.
When wood is kiln dried, it is stacked and stickered with huge concrete weights on top. As the wood dries the concrete keeps the stack compressed to control twisting of the boards.
I designed this fixture, which works as follows. The main piece is the 10-foot long 6-inch square heavy wall tubing – unbendable for our purposes. Every two feet crossing the tubing is a heavy wall tubing to support the stack and hold the clamps.
Rather than use weights at the top, I made clamps with ready rod. Only one is shown in the photo. I cut 1 inch pieces of pipe large enough to go around the cross members and made that into a connector by drilling and tapping it for the ready-rod. I use 2×4 on edge for the clamp. Capacity of the fixture is limited only by the length of ready-rod used for the clamps.
As the stickered wood dries you simply tighten up the nuts on the ready rod clamps. Drying the wood from green to under 10%, you will probably tighten the nuts as much as 4 inches over about ten weeks.
One fixture is in the green house and the other is outside under a lean-to so I know both types of location works.
You can dry to under 10% and, because it is not dried in a hurry, you will get few split ends. There will be little to no twisting.
-- Phil in British Columbia