Duplicating archs/curves with a router?
I'm making some curved trim above a window. Let's say I rough cut the piece with a jig/scroll/band saw. I use a belt sander for the final shaping of one side of the curve to my best ability. I don't want to spend time trying the sand the other side to the right radius and consistent thickness. Is there a way to set up the router to copy the outside curve onto the inside?
Say the piece is roughly 1 3/4" in width and I want it down to 1 1/2", is there a jig that could be used on the well finished side of the curve to smooth out and trim the inner/rough side?
Please post pictures or insert links if you know how to set this up.