Adjusting the infeed table on your jointer to be other than even with the blades
will produce a convex or concave (depending on whether it's higher or lower)
caul. I've produced many this way although it was unintentional. The amount of
curve would depend on the application.
Buffalo, NY - USA
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and then successively shorter strokes starting further out from
the middle. I don't have one handy to measure, but IIRC the
ends wound up about 1/8" thinner than the middle for a 4' caul.
And the curve is convex, not concave :-).
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