Well I gotta jump in here and add my 2 cents worth. It's easier in my mind to consider bowed boards instead of cupped boards. A bowed board (bent along the boards length) will be flattened by the roller pressure underneath the cutter but after exiting will resume it's bowed shape. I can see how, and I have milled cupped boards on my planner by putting the concave side down and taking light cuts until I have a flat reference surface and then flip the board over and start taking the high edges off. Going back and forth gives me good results. YMMV. Of course it only works if the board is otherwise straight.
Last edited by Michael Weber; 01-06-2010 at 9:04 PM.
Reason: got warped/bowed confused in my tiny mind.
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