Abstract
Many different parameters have been defined to give a description of a mechanical surface structure. Ra (the arithmetic mean value of the profile signal), Rq (the rms value), and Rmax (the maximum peak‐to‐peak value) are some of the most commonly used. Also, the surface profile, height distribution, and autocorrelation function are often shown. In many applications, however, neither the parameters nor the surface profile give sufficient information about the surface. Examples are even found where use of the “conventional” parameters gives misleading results. The need for a more advanced surface characterization covering a wide range of applications in one single parameter is obvious. Fourier analysis of the surface profile seems to be the best answer to this need, letting the wavelength spectrum be the parameter describing the surface. The above considerations will be further discussed. A series of typical mechanical surfaces has been tested, and their wavelength spectra will be shown and interpreted. The relation to the surface profile and the conventional parameters will be mentioned, and an example of use of the wavelength spectrum to compare different lubricants used in a shaving process will be given.
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