Reply by JBrow

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Posted on Milling

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1368 posts in 1482 days

#1 posted 02-21-2017 02:46 AM


It sounds like you have taken great care to produce the first glue-up. You did not specifically say, but I assume that when the first glue-up was flattened, the faces remained parallel to one another. Therefore I wonder whether the first glue-up absorbed or lost moisture on one face versus on the other face. If the first glue-up was relatively thick, the change in moisture could go unnoticed until the strips are cut off the first glue-up. With less wood to restrain movement, the strips could bow. If this happened, then clamping pressure could be enough to overcome the bowing if the bow on one strip is opposite the bow of the other strip. If the bows run parallel, then the assembled strips could appear wider in the center than on the edges.

I would think that if the first glue-up were set on a solid surface for a few hours, enough moisture could enter or leave the wood on the surface exposed to the air and build up stress in the first glue-up. I do not where you are located, but the weather has been atypical here in Ohio, with low humidity and cold temperatures one day followed by a day of higher humidity brought on by higher temperatures. If your weather has been crazy wild, then perhaps this explains why your two most recent cutting boards have been problematic.

If the top and bottom faces of the first glue-up were not kept parallel to one another when flattened, then perhaps this unevenness accounts for the problem.

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