The authors consider that existing two-dimensional surface parameters (calculated using stylus profilometry techniques) are inadequate for describing engineering surfaces when the three-dimensional nature of an engineering surface also affects the functional performance. This paper proposes a definition of three-dimensional surface texture in terms of lay, directionality and anisotropy. The authors propose a novel technique developed from image processing technology, which uses vectors, to describe these three-dimensional surface properties. The proposed technique is validated via analysis of a series of turned surfaces.
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