imrichb

I'm trying to cut a semi-circular groove along the edge of a piece, pictured in the attached. I can do this easily along a straight edge using my router table and a round nose bit. The challenge is that I'd like to do this along an edge that is curved (and to make it more challenging, a concave curve).

Any advice? I had thought maybe I could use a 3/4" ball cutter bit with a 1/2" bearing around the shank to guide it along the edge of the workpiece, but unfortunately I can only find a ball cutter bit of that size with a 1/2" shank, meaning that I can't put a bearing around it.

(In case you're curious, this is for a children's toy I am working on. The groove will essentially form a track for a marble to run down.)

Thanks in advance!

Rich

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