[Robert M]

Superman as always....to the rescue :-)
Sound like a good approach....except, in this particular file, I do not have a 3d center line ?...it's imported from a DWG and for some reason, I can't "grip" to some lines allowing me to add one !?

BUT.....by using the surface rough pocket then fallowed W/ surface finish blend with a step over (15%)....it look ....ok !?
still "playing" with this and some other alternatives !!
But ( another but !) ,,,,I still would like to here some other alternatives....as I'm certain MC can offer me ( for this case and further ones) various ones ?? ( maybe art ?)

[mmoe]

Using a centerline to drive the tool will only work if the radius is the same from end to end. To my eye, it looks like the radius varies from one end to the other (basically conical), in which case it will need to be done via 3d toolpath. What strategies do you have available?