That's a tough job to do with negative rake inserts and no follower rest, nice work! I would have expected some chatter marks as I often get that until I play with insert geometry choices, speed, feed and depth of cut. It can take a few tries to kill the harmonic resonance you get with long turning like that.
BTW, the finish you see is usually a result of short chipping in the turning operation. It's a necessary evil with a long cut, otherwise the long stringy chips can get wrapped around the part, the machine and/or the operator!
BTW, the finish you see is usually a result of short chipping in the turning operation. It's a necessary evil with a long cut, otherwise the long stringy chips can get wrapped around the part, the machine and/or the operator!