Abstract: A multiple data dependent systems (MDDS) method is presented which provides a component by component wavelength decomposition of the surface roughness profiles at a finite number of radial sections of the workpiece. The characteristics of these wavelength components are correlated to different surface generation mechanisms. Their relative powers are used to measure the contributions of the mechanisms to the total roughness. Since the localised cutting dynamics are taken into account, the method resolves the shortcomings of conventional DDS and FFT spectrum analysis methods in characterising the localised variation of the material properties, cutting dynamics and surface roughness in SPDT.

Key words: Cutting dynamics, Data dependent systems method, Surface generation, Ultraprecision diamond turning, Vibration