Radius cutter

[rich the mechanic]

Ok i have been meaning to make a ball turner/radius cutter for a while but as I'm making some air filter intake bell mouths for a set of bike carbs and need to turn the alloy outer ends to a radius to smooth the air flow now I have made a cutter but I would call it an external radius - internal cutter but I couldn't find any pictures on google to save making an error. Do these have a name or does anyone have a picture of any?

 

[Pete.]

As it happens Hemingway have a discount running right now (ends tomorrow). Perhaps they have something you could use.

http://hemingwaykits.com/index.html