I created a helix for a path, and cut with a section.  It almost looks like a drill bit.   Now I want to mill these slots on a 4 axis mill.

I can use a ball nose cutter to mill the slot.  It will cut a full radius at the end.  Then I intend to use a chamfer tool finish the bevel on both sides.

The bevel tool has no radius path at the end.

How can finish this part to create a full radius for the slot and the chamfer, at the end of the helix.

Any modeling ideas? 

Thanks