I'm making an oval cutting board to give as a wedding gift. I'm trying to figure out how to route a juice groove so that it is perfectly concentric with the outer edge. I plan on using the three nail method to draw the oval, and I am a little concerned that the oval won't be perfectly symmetrical. My only plan is to use a round spacer to trace an offset oval around the board and cut out a template to use to register the round router base against.
Is there an easier way to cut this groove? I'm mostly concerned with cutting and smoothing a perfect concentric oval template. Any suggestions will be appreciated.
Thanks, Dan