Hi BBY The one I have on my RAS cuts a pretty flat bottom. That is why I never had it sharpened. I'm afraid they'd screw it up!! I have not had to flatten the bottom of a dado with it yet!! I have used other brands and they'd leave a convex bottom all the time. I could not find a photo of the Craftsman "Excaliber" FWIW. . Just an explanation of it.
Cheers, Jim ........................ Variety is the spice of life...............Learn something new every day