THE ORIGIN AND INTERPRETATION OF SPATIAL-FREQUENCIES IN A TURNED SURFACE PROFILE

An investigation into the origin of spatial frequencies within a turne d surface profile is presented. A wavelength decomposition methodology is used to characterize the wavelength structure of experimental prof iles. A model for surface generation in a turning process is described . The model accounts for the stochastic nature and the dynamic respons e of the cutting process. The model is studied analytically and predic tions of the wavelengths in the surface profile are obtained. The mode l is also examined via computer simulations, and the resulting wavelen gth predictions are seen to compare favorably with the analytical pred ictions. Finally, the experimental data and associated wavelength stru cture are compared to the analytical and simulated results from the mo del. The model predictions are observed to match, and capture the stru cture in, the experimentally obtained surface profile data. It is show n that many of the spatial frequencies within a surface profile result from the ''sampling'' of the radial displacement of the tool relative to the work.