Stylus measurement techniques: A contribution to the problem of parameter variation☆

Abstract In this paper some effects of experimental technique on the assessment of engineering surfaces by stylus profilometry are considered. It is shown that some of the variation in surface statistics obtained is a result of (i) tracking inaccuracy, (ii) filtering of data by the choice of skid or datum, (iii) surface damage caused by stylus and skid or (iv) substantial errors caused by particles attaching themselves to the surface under assessment. Some guidance is given for good experimental practice and the operation of the instrument. It is suggested that new standards which relate to the use of skid and datum may be necessary since the results obtained are substantially different.