Suppose you have a green - REALLY green - board 10" wide and 2-3' long; you
cut a 1" wide groove long ways through the center, stopping 2-3" from each
end. What's going to happen to that groove once the board is bone dry?
Narrower? Wider? Nothing?
Well, drier certainly. Wood shrinks as it dries. OK you can plan for
that, kind of. What you can't account for is shape changes: cupping,
bowing, and worst of all twisting. Take a look at
or better yet:
Good luck and good night.
It's going to shrink right along w/ the rest of the board as it
dries...it'll also probably want to cup; didn't give any info on
thickness of board nor the dado with respect to thickness nor grain--was
it plain sawn w/ noticeable radii, quartersawn or something in between?
On Tuesday, July 30, 2013 7:57:16 AM UTC-5, dadiOH wrote:
My guess... The board will shrink more in width than it does in length. W
hether the board "arcs" to open or close the groove will depend on the way
the grain curves at the end of the board... the grain usually tries to stra
ighten out. Beyond that, there will be lengthwise cracks.
It depends on how it is cut from the log. Each grain pattern ends up
different. some cup and the cut would be wider on one side and narrower
on the other. Some warp and the cut might be different widths along the
length. Some get shorter. Some get narrower. The type of wood and the
drying conditions also play a role. Properly stacked and dried the
cupping and warping can be minimized. Properly sealed so that the drying
is slow and even and the shrinking can be minimized.
It all depends as to what the result will be.
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