I am making several parts with a simple part with a hex. I know I am an anything like expert. I know at least two shortcuts by me but they don’t explain why I get good finish in one axis and chatter in an other. Can you folks help me explain some improvements. I did several with differing speeds and feeds and I used a 12mm 4 flute endmill with flood coolant. Kind of a big endmill for the small mill.
I am attempting to add a photo. Can’t figure it out (photos).