Good morning,

I am currently attempting to break a chip (Or even control it) on 4140 (Annealed) material.
D.O.C is .1 per side (Have attempted .06", .08") I have also attempted to use the Vibration Control Turning to help and still struggling.
SFM is at 410 with a feed rate of .0027". Have tried going up to .006 but loose finish. Using a .015 radius insert, have tried .032".
Requirements are finish of 63, and turning material from 1.25 down to 1" at about a 2" length.

Any suggestions? This material is always a struggle for me, as I also run Citizens and DMGS on it and can never seem to get the chip to break properly.