A concept of an application of couples comparing method to the comparison of roundness profiles

A crucial problem in the area of measurements of roundness profiles is a need to compare existing measurement methods. A roundness profile that is obtained through a measurement is a basis for an evaluation of a quality of surface texture of an element with the use of numerical values of preselected parameters. Visual comparison gives only an approximate information on compared profiles and it does not provide any quantitative indicator that would describe coincidence of obtained roundness profiles. The methods that are usually used to a statistical comparison of surface profiles obtained from two different measuring instruments are based on investigating a correlation between two separate sets of measurement data with the use of specific parameters. The couples comparing method is a new concept that permits comparison of roundness profiles. This idea, owing to its methodology, allows comparison of roundness profiles obtained with the use of V-block method with the ones obtained by the radius change method. It is also possible to adjust the couples comparison method to determining optimum parameters of measuring instruments as well as to comparing measuring instruments. Thus, it seems relevant to verify this method under industrial conditions.