Curved drill bit?

I'm looking for a curved drill bit for a project. Rather than explain, here's a picture:



photo.jpg



The red is the cutting edge. It would leave a fluted bowl shape behind, like a shallow, curved speaker cone. Ideally about 80mm in diameter.



Does anyone know if such a thing exists? Or something similar?



Thanks very much.

Attached Images

• photo.jpg (85.1 KB)