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Cutting tests were conducted to medium carbon steel using HSS tools with cutting fluid. The     experimental design used was based on response surface methodology (RSM) using a central composite     design. Chips were collected at different machining conditions and thickness and microhardness     measurements taken and analyzed using “DESIGN EXPERT 7” experimental design software. Mathematical models of the  responses (thickness and microhardness) as functions of the conditions (speed, feed, and depth of cut)  were obtained and studied. The resultant second-order models show chip thickness increases when  increasing feed and speed, while increasing depth of cut resulted in a little effect on chip thickness.  Chip microhardness increases with increasing depth of cut. It also increases with  increasing speed and feed up to a certain level beyond which further increases cause a drop in  microhardness

Chip Thickness and Microhardness Prediction Models during Turning of Medium Carbon Steel