Jan 30, 2009· Hi, I have a contour I have to machine. I attached the file. Tool path #7 Surface Finish Contour. All I want to do is have a 3/8" ball mill profile radius this edge. What am I doing wrong. I am learning as I go I just started a week ago on my own. Starting to get a feel for things but somethings I just can't figure out why it does what it does.