I guess maybe I don't understand. I thought what you wanted was a grove that
was deeper and wider at one end than at the other. The following ball bit
will give you that but not a curve. Sorry. JG

http://www.leevalley.com/wood/page.a...168,46173&ap=1

"G.E.R.R.Y." wrote:

In article , JGS
wrote:

When I need to make that type of groove, I make a ramp jig. It's just a
couple of wood triangles attached to a piece of hardboard which has a
slot cut in it for the router bit to protrude through. Is that clear
enough?

I'm sorry if I'm going to sound a bit thick, but I'm not sure I
understand. The bottom of the groove needs to be curved lengthwise and
widthwise as though an egg could rest in it. Your ramp jig sounds to me
like it would not give a curve in either direction, or am I missing
something here?

Gerry