I have an Atlas 618 MK2 lathe. The other night I was trying to cutoff 1018 steel (for the first time ever) using a 1/16" Cleveland Twist Drill Mo-Max Cobalt Cut-off blade mounted in my rock solid KRF Omni-post QCTP.
I was getting chatter so bad that the bench was bouncing. Then I tried reducing the speed to below 200 rpm which according to the book should be in the right speed zone for 1018 (80 sfm). Still chatter. I re-checked that my tip was on center. Then I tried feeding in really, really, really slow. Chatter was less, but all of sudden it caught and jammed the spindle.
As far as I can tell, nothing broke on the lathe, but it scared me.
This setup slices through 6061 like butter. Any ideas on how I can part-off steel? Am I doing something wrong with the setup?