For a large radius, this router compass is easy to make and adjust. To make it, remove the router base and trace its outer edge, the center hole, and the screw holes on a piece of 1⁄4-in. or 1⁄2-in. plywood. Cut out the base, leaving it a couple of inches long and squared off on one end. Drill for the center hole and screws, and attach a square cleat on the leading side. Countersink the screws so they don’t scratch the workpiece. The beam is a longer length of square stock with a hole drilled through one end for the center screw. For layout, make a pencil compass by overlapping two pieces of narrow stock and clamping them together at the correct length. Drill one end for the pencil and drive a nail through the other to hold the center. With the circle drawn, insert the router-compass screw in the center, place the bit on the pencil line, and clamp the beam to the cleat on the router’s base. Now you are ready to rout.

Gary Williams, Lakeside, CT

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