The drill bit did what it was supposed to do which was smooth a 24" x 24" table top of epoxy filled blocks of wood. My passes were about 1" wide and the depth of cut was limited to about 2mm, and wider and deeper passes would put too much strain on the milling motor. While the chisel worked fine if I had to do it again I wouldn't get a full diameter chisel, I think I would have had better results with a chisel with two smaller blades as it's easier to remove debris. Although these blades are set at an angle to the center, which should provide some relief in the center, I felt that this wasn't enough.