1. Surface finishes and form deviations
To characterize the geometry of a surface, we'll be interested in the variations of the z (x,y ) dimension, locally normal to the mean surface, as a function of the x and y positional parameters on the surface, at different scales.
On the scale of the part as a whole, we are interested in deviations of the average surface from an ideal surface of simple shape: plane, sphere, cylinder or cone, for example. In this study of shape deviations, we will ignore roughness and define a local average surface.
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Surface finishes and form deviations
Two-dimensional spatial frequencies
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