Combined roundness and straightness measurement applied to the assessment of cylindricity profiles of machine parts

摘要

The traditional methods used for the measurement of cylindricity do not always provide us with complete qualitative and quantitative data about the whole surface of an object, particularly in the case of local difficult-to-detect irregularities. The combined method involves measuring roundness profiles in several transverse sections as well as straightness profiles in several longitudinal sections. In conventional instruments, the measuring sensor moves along the object axis, so straightness profiles of the generatrices of the cylindrical surface are seldom measured. The combined measurement is possible thanks to a specially developed measuring system basing on a new mathematical model and calculation procedures.