Machinability assessment of two high strength materials were earned out using uncoated and coated carbide tool inserts. The materials investigated were EN24T steel (290 BHN) and inconel 718 (415-444 BHN) The objectives of these investigation were to generate cutting data in relation to the machining responses ie , tool life, surface roughness, and cutting forces. The cutting tests were carried out using one-variable-at-a-time and design of expenments. For one-variable-at-a-time experiment, cutting forces and tool life were measured. In these tests, the cutting variables ie , cutting speed, feed rate, and depth of cut were varied to study their effects on the tool life and cutting forces. The different tool life exponents of the extended Taylor’s tool life equation were determined graphically With the design of expenments, the combined effects of the cutting vanables were investigated on the machining responses. The experimental data based on the design of expenments were analyzed by the response surface methodology, statistical regression packages, and sequential estimation techniques. Various mathematical models were developed using these techniques. The adequacy of each model was judged by statistical analysis. Using the mathematical models of different responses, a computerized machinability data base system was developed to facilitate the optimum selection of cutting parameters. The selection of cutting parameters is applicable for EN24T steel and inconel 718 only. However, the data base could be extended to incorporate different work materials and tool combinations.