D. W. Ahmed, H. Sein, Manchester Metropolitan University, Manchester, United Kingdom; M. J. Jackson, Purdue University, West Lafayette, IN; R. T. M. Woodwards, North Manchester General Hospital, Manchester, England

Summary: Diamond coating on Co cemented tungsten carbide (WC-Co) hard metal tools are widely used for cutting non-ferrous metal. Diamond coating on conventional cutting tools such as inserts and flat substrates have been reported elsewhere. However, it is difficult to deposit diamond on cutting tool with complex geometry by one-step deposition method. This paper deals with cutting tools, which possess 3-D complex or cylindrical shape. The diamond deposition has been carried out in a hot filament chemical vapour deposition (HFCVD) reactor. A modified filament arrangement has been employed for diamond deposition.