Cubic Boron Nitride (CBN) and TiN Composite Coated CBN combines the thermal stability, super abrasiveness and cost effectiveness for hard machining applications. This paper reports the results of a study addressing wear performance of these CBN and TiN based coated CBN inserts (SNMN090308) fir face milling of 61 HRC hardened 90MnCrV8 tool steel. Machining test conditions are obtained after dynamic stability simulation of cutting tools and machine tools. The tool wear and cutting forces are also analyzed and the results are presented. (C) 2011 Journal of Mechanical Engineering. All rights reserved.