There are many machines, devices and production lines that are equipped with rotating elements (shafts, axes, spindles, trailing and drive wheels, etc.). Correct geometry of these elements ensures trouble-free operation, and, in the case of machine tools it decides about the correct geometric parameters of the manufactured semi-finished articles and products. In this respect, the newly manufactured and operated lathes are checked against the correct geometry of their parts which determine the location of the work-piece and the lathe and their movement These parts are geometrically correct if the errors of their geometrical shape (deviations) do not exceed values designated in the standards. The wearing of lathes reveals the so-called spindle run-out (deviation from circularity). These deviations are determined using mainly the workshop methods. However, due to the considerable sizes of machine tools surveying methods and new methods which use electronic and optoelectronic devices also apply. Authors of this work present the measuring set (which they designed and built themselves) which relies on the two-point fibre signalling device which is installed in the lathe spindle chuck jaws. The position of the signalling device during the lathe spindle rotation is recorded with CCD/CMOS digital camera, and the images are stored on the camera memory card. The aim of the presented research and experimental works was to determine the internal conformity of measurement results that were obtained using the designed and constructed measuring set, to check whether there is a correlation between the results obtained using the dial indicator and to analyse the accuracy of observations that were made using the test set. The designed measuring set enables to determine deviations from circularity during the lathe spindle rotation with the accuracy of ± 0.02 mm.

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