ANALYSIS OF THE ERRORS OF AUTOMATED COORDINATE METHODS FOR MEASURING STEP PARAMETERS OF MACHINED SURFACES

Computer coordinate methods of measurement are now becoming the main m ethods for the metrology of surface quality. Nevertheless they lead to certain additional specific errors which are manifested to the greate st degree in the measurement of step parameters and the parameters of extremum values of surface coordinates. An estimate is given below of the errors of computer coordinate methods of measuring step parameters of the roughness profile of machined surfaces and practical recommend ations are given concerning the choice of measurement regimes.