GRB, I know there are many solutions to the problem you posed. Im sure Tom would design a template. I know Bob and Rick make nice centering jigs using a pin on each side to center Mortises on the work. Starting out with limited accesories I would build a fence for the router. Its not difficult to do. Get a piece of 1/4" Masonite, plexiglass or acrylic that is at least as wide as your router base and say 18" long. Remove your base plate and mark your hole pattern onto the "fence base" material. Drill and countersink the mounting holes, make the center cut out large enough for any bits you will need to use. Attach your router using screws an 1/8th inch longer than the factory ones. Mount a V groove bit in the router. Mark your centerlines on the wood and place the V bit on the line. Next attach a short piece of wood to your fence base with a couple screws to ride along the edge of the wood. Now you have a custom edge guide for your project. When working with a different thickness just relocate your guide block and screws. As a bonus you can simply remove the guide block and flip your fence upside down with a V bit installed and measure from the center down the fence 1/2 the diameter of any circle you want to cut. Remember to add half the bit diameter to this measurement. Drill a small hole for a centering nail or screw and you have a circle cutting jig. This is a fast, easy and useful project. The fact that you can make several of these for about $10 is the icing on the cake.
Last edited by Mike; 12-07-2004 at 10:18 AM.