Temperatures of the carbide tip's surface when turning stainless steel with a chamfered tool with a worn main cutting is investigated. The carbide tip's mounting in the tool holder are ground to a wear depth that is measured by a toolmaker microscop and a new cutting temperature model incorporating tool wear factor and using the variations of shear and friction plane areas occurring in tool worn situations are presented in this paper. The frictional forces and heat generated in the basic cutting tools are calculated by using the measured cutting forces and the theoretical cutting analysis. The heat partition factor between the tip and chip is solved by using the inverse heat transfer analysis, which utilizes temperature on the P type carbide tip's surface measured by infrared as the input. The tip's carbide surface temperature is determined by finite element analysis (FEA) and compared with temperatures obtained from experimental measurements. Good agreement demonstrates the accuracy of the proposed model.