... composed of ferum Journal of Physical Science, Vol. 18(1), 75–85, 2007 75 WEAR MECHANISM OF TiN, TiAlN AND TiCN COATED DRILLS DURING DRILLING OF CARBON STEEL R.J. Talib*, M.R.M. Toff and ... milling machine at spindle rotation of 1,600 rpm and feed rate of 20 mm/min. A carbon steel plate with a thickness of 30 mm was used as a work piece and the depth of drill was set at 25 mm. After ... piece as a result of broken cutting lip and land, and blunting-off chisel wedge. 6. ACKNOWLEDGEMENTS The authors are grateful to the Government of Malaysia for the funding of this research....