I am building a kitchen table 3'x6' and have jointed the 7 boards that make up the top and thicknessed them all down to final thickness. As you can see in the photo, one of the boards is a bit warped, and the piece cannot be cut down. The raised edge in the photo is about 3/16 higher. Lesson learned: check for this before thicknessing the boards.
How bad do you think this will impact the end product in terms of flatness, or causing warp in the rest of the top? I don't have a replacement handy, but could get one if that's the consistent advice here. I don't think i will have a problem glueing up since i have cauls and dowles, but am not sure if this will resolve the issue.
It looks like everything else is flat and true. I don't know how thick they are, but I would go ahead and join them so that it's in the middle. I believe that the others will hold it in place. My opinion.
Might use a couple of bisquits to make sure it stay level with the other boards. I also agree with Monte, put it in the middle and the glue from the boards on either side will hold it.
Second the breadboard ends. If not, I don't know what your plans are for legs/aprons, but you could screw a cleat or two on the underside and screw up into the table to provide additional insurance.
My first thought was to use a permanent caul (maybe you'd call it a cleat like Binghamton said) screwed to the underside of the table (hidden by the apron) with oversize holes drilled to allow for seasonal wood movement of the top. This would hold the boards flat from the underside. Good luck!
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