 (1990) proposed a method to rank the materials in terms of machinability.Malakooti (2013) presents a comprehensive discussion about tool life and its multi-criteria problem.As an example objectives can be minimizing of Total cost (which can be measured by the total cost of replacing all tools during a production period), maximizing of Productivity (which can be measured by the total number of parts produced per period), and maximizing of quality of cutting.