| Friction between chisel and working objects will produce high heat and result in a worn chisel, this leads to the formation of a rougher surface and shorter chisel lifetime which decreases product quality. The surface quality of working objects is affected not only by the chisel’s endurance towards weariness, but also by machinery parameter settings such as cutting speed, feeding and depth of cut. These parameters can affect surface roughness and chisel lifetime. In this analysis, Taguchi method was used to know which parameter affects surface roughness the most and Taylor method was used to compute the chisel’s lifetime. This analysis used a carbide chisel and gray cast iron as working objects. The result of this analysis is feeding affects surface roughness the most, followed by cutting speed and depth of cut. Meanwhile the carbide chisel’s lifetime with gray cast iron as working objects has the Taylor equation of ????0,397=72,7846. |