We are making test cuts using Emuge's Jet Cut 3/8" diameter end mill cutting at 1.5X D depth (.512" deep) in 4140 Pre Hardened steel on a Haas DM2 milling center. We are cutting 5 areas that are X dim 3.0" x Y dim .625". The tool path is Mastercam Dynamic Peel mill and the CNC machine is a Haas DM2. We are increasing the width of cut of each area along with adjusting the SFM and chip load. After each cut we captured several chips and viewed them under a microscope to analyze the color and shape.