1 Building the jig
The jig shown at left is ideal for routing grooves in a rectangular pattern; it can also be fitted with templates for curved cuts. Saw the guides from l-by-2 stock and rout a groove % inch deep and wide along the inside edge of each one. Cut a two-shouldered tenon at one end of each guide to fit in the grooves and bore a pilot hole into the middle of each tenon for a %-inch-diameter hanger bolt. Screw the bolts in place, leaving enough thread protruding to feed it through the adjacent edge guide with a washer and wing nut. Finally, rout %-inch-wide mortises through the guides; start about Ш inches from the end with the tenon and make the mortises 4 inches long, separating them with about H inch of wood. Assemble the jig by slipping the tenons and bolts through the grooves and mortises of the adjacent guide and installing the washers and nuts. For curves, make templates like those shown in the illustration.