Abstract
Some applications in the field of surface metrology are described for a new stylus instrument incorporating a transducer with a wide dynamic range. The transducer has a range of 2.0 mm and a resolution of 5 nm enabling the measurement of both the fine surface texture and the surface form of a highly formed component to be made in a single traverse. The form is separated from the texture mathematically by the calculation of certain dimensional parameters relating to that form. The examples outlined in this paper specifically refer to the form being either a circular arc, giving the radius, or a straight line, giving the angle of tilt. Applications include the measurement of form errors, surface finish and radius of circular formed components such as ball bearing raceways, diamond turned mirrors, a diamond turning tool and the surface geometry of a Rockwell C hardness indenter. Some of the implications of this technique are described especially in relation to its measurement of surface finish.
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