Cutting matching curves between panels and solid wood edging can be a problem. Even in the unlikely event that you are able to saw a perfect curve, the width of the sawkerf would prevent you from using the resulting pieces to create perfectly matching concave and convex profiles. To overcome this problem, woodworker Carol Koebbeman invented a pair of matching templates. Made of medium-density fiberboard (MDF), they will stand up to the force of a bearing-guided router bit. Koebbeman used each of them twice, first as a layout tool and then to shape the curves. Using her technique, you can cut curved profiles that match exactly from end to end.

From Fine Woodworking #179