david u...a question to you about these 1" thick boards.
If they are cupped a little, will they crack when he puts the screws to them and forces them flat?....or, are they pretty forgiving?
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John...a note about cupping
If david u thinks you are going to be OK with a little cupping, you might have to re-think the surface planing procedure. As you can imagine, surface planing cupped surfaces is a waste unless you remove enough stock on both surfaces to get a consistently flat board....usually leaving a considerably thinner board.