1 Constructing the jig
For curving the corners of a workpiece, you can use the simple corner-rounding jig shown at right. The jig consists of a plywood base and two lips that align the edges of the jig and the workpiece. Cut the base from %-inch plywood. For most jobs, a base about 10 inches wide and 16 inches long will be adequate. Draw the curve you wish to rout on one corner of the base and cut it with a band saw or a saber saw; sand the edge smooth. Cut the lips from solid stock Уг inch thick and IV2 inches wide, then nail or screw the pieces to the base, leaving about 3 to 4 inches between each lip and the rounded corner. The top edge of the lips should be flush with the top surface of the base.