Chamfer Mill why is it invalid for milling Autodesk 07 11 2020· Chamfer Mill why is it invalid for milling Hi All I see this was unsolved back in 2017 I have 2F D4 90 deg 50L bit that I purchased for chamfering I entered this in my tool library as a Chamfer Mill though it look nothing like the one in the picture there are no V shaped bits in the F360 tool library types