I agree with Brad, not a safe operation for a table saw. I was building some utilitarian shelving using 2x4's and planned to notch the vertical 2x4's for the shelves to rest in. I was going to make the notches with my cabinet saw, but even with as much care as I took selecting the best 2x4's there were enough twists and bows that just about nothing sat flat on the table when I began the cut. I made quick work out of it by using a circular saw and a chisel. For me it wasn't worth dimentioning a bunch of knotty 2x4's.