On the Periodicity of Machined Surface

Abstract

A method of examining the existence of the periodical component on surfaces finished by abrasive grains or with other methods are considered by applying the stochastic process analysis.
According to the results of this consideration, the following precautions are necessary in the evaluation of the surface characteristics.
1) The existence of the periodical component must be objectively assessed with reference to the magnitiude of the confidence band of the power spectrum.
2) Because the interval between the measuring points Δχ and lag number τ influences on the resolvability of the power spectrum of the surface, their values must be selected according to the object of observation.
3) The sampling length of the profile curve used for the analysis must be chosen so that required property of the surface can be assessed with necessary precision.