Abstract
This article discusses a method for the measurement of the root-mean-square circles of the important cylindrical surfaces of large-scale shafts. The method allows the realization of the measurement directly on the machine by the use of the results of measuring the radial runout of the relevant cross-sections of the shaft and of one attached to the shaft forehead etalon ring which has pre-calibrated both the diameter and as well as its roundness deviation. The main sources of uncertainty have been analysed.
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