Reply by JayT

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Posted on Flattening a large bowed piece of wood w/o losing thickness

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5961 posts in 2414 days

#1 posted 12-24-2015 01:42 PM

First off, is it cupped or bowed? Talking about weights on the ends makes me think you are actually referring to bow. Cup is warp across the face, while bow is warped down the length of the board.

If you are really talking about cup, then the only success I’ve ever had with “fixing” a cupped board was to take a spray bottle and mist the concave face of the board, then lay it out with the convex side up for a while in a place where it’ll dry—like out in the sun or a heated shop. The cupping is a result of moisture leaving the board unevenly. Doing this process helps to equalize the moisture.

No guarantees it’ll work. I’ve had it work perfectly (then stored the board in its edge to prevent it from happening again) but more often the board tries to cup again because the grain structure in flat sawn boards allows moisture to leave from one face faster than the other.

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