Abstract
An interlaboratory comparison of parallelism measurements was carried out among five national metrology institutes and four manufacturers of form measuring instruments from six European countries. The round robin lasted about 1 year. The comparison involved the measurement of the straightness of four generating lines and of the parallelism of opposite measurement profile pairs of a cylindrical steel standard and a rectangular ceramic straightness standard. The results show good agreement for the straightness measurements. The comparison of the parallelism measurements was not entirely satisfying, not only with respect to the stated measurement uncertainties, but also with respect to today's manufacturing tolerances. The analysis of the measurement results — taking the measurement methods and instruments used into account — documents the state of the art of cylinder form measurement and allows identification of problems and provision of recommendations regarding the measurement of parallelism.
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