An experimental study has been carried out to investigate and compare the cutting tool performances represented by insert wear, surface roughness forces of an uncoated carbide (H13A) three coated carbides GC2015 ( TiCN / Al2O3 TiN ), GC1015 (TiN) GC4215 ) during dry turning AISI4140 steel. Turning was 5 minutes on cylindrical specimens (80 mm diameter 400 length) along with a depth 0.5 mm, feed...