Sobron lbs, Erwin Siahaan, Teguh Imam Suyatno
Department of Mechanical Engineering,
Faculty of Engineering – Universitas Tarumanagara
Jl.S.Parman No.1 Jakarta 11400
Cutting tools are the main things that need to be considered in the process of cutting metal, in generating good condition workpiece surface. Cutting tool geometry influence in determining the selection of cutting parameters, it gives effect to the rate of production, cutting force, cutting power and quality of the metal surface. Manufacture of machine components using machine tools, require precision dimensions and surface smoothness produced, to be used in accordance with its function. Surface roughness value is the indicator that is used in producing a product with a low surface roughness values (smooth). Cutting tool insert has a nose radius that is varied, and this gives the effect on the resulting surface roughness values. This study was conducted to analyze the effect of the nose radius of cutting tools to the value of the surface roughness of steel ST 60 when the cutting process is carried out using a lathe machine. This research was conducted with an experimental method using a CNC lathe, the workpiece material used is steel ST 60 is generally used in the manufacture of engine components. Cutting tools used by three types of carbide cutting tools nose radius is 0.4 mm; 0.8 mm and 1.2 mm. Workpiece surface roughness measurement with a surface roughness measuring instrument Mitutoyo Surftest SJ-301 type. Results of research conducted in getting that value the highest roughness of 3.63 μm by using the tool nose radius of 0.4 mm and coolant Dromus, the lowest roughness of 1.67 μm by using the tool nose radius of 1.2 mm and coolant cutting APX. Viscosity is contained in the coolant also affect the value of roughness on the Surface.
Keywords: Tool nose radius, CNC, surface roughness, carbide inserts