Surface roughness is defined according to geometrical parameters and is measured mainly with instruments evaluating the depths of the irregularities or other geometrical properties such as the number of peaks per unit length or the percentage bearing area at various levels.
This paper deals with the assessment of surface roughness by non-geometrical means based on functional aspects of ‘roughness’.
The study is therefore concerned with (a) the evaluation of surface roughness by means of tactile comparison, and (b) an instrument simulating the action of tactile comparison or the finger-nail test.
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