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The second jig for cutting curves and circles with a router can be made from scraps that are around the workshop. Like the jig described above, it's attached to the router's sub-base.
Drill holes the same size as the dowels into one long edge of the 12" x 1x4 wood block. The holes should be as far apart as the diameter of the router's base.
Apply a little wood glue to the holes in the wood block. Place the dowels inside the holes, and allow the glue to dry.
Place the dowels through the holes on the sides of the router's base.
To use the jig to cut an arch or a circle, nail the center of the block to the center of the desired circle (image 1). Slide the router to the appropriate spot on the dowels to correspond with the end point of the desired radius. Set the router bit to the appropriate depth. Slowly swing the router through the work piece, using the wood block as a pivot point (image 2). Repeat the process as necessary, slowly lowering the bit with each pass.