Sorry.... What is it "ton cutter"? Thin cutter? Sorry for my English..
Google help me - I found article for PPC. "Barrel" tool is a same?
I open some HOFFMAN webpages - I dont understand why "parabolic" - true radius, huge radius, Rw=500 (for example).
You can use BARREL TOOL from OOTB
in NX1847 we already have a better way to define the tangent Barrel:
in NX 1872 you will be able to easily define Taper Barrel (ignore the ugly temporary picture):