
Surface Roughness for CNC Machining
Surface Profile Comparison — microscopic cross-section view Ra values in µm Ra 3.2 µmDefault Ra 1.6 µmPrecision Ra 0.8 µmHigh-precision Ra 0.4 µmUltra-precision What Is Surface Roughness? Surface roughness describes the microscopic peaks and valleys left on a machined surface as a result of the cutting process. Even a surface that looks perfectly smooth to the naked





