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531.7The main ~.pes of roundness measuring gauges used in industrial countries are considered. A mountable roundness measuring gauge made by a precision machine-tool plant in St. Petersburg is compared with those ~pes.Checking the accuracy of the geometric form of machine parts is one of the most complex problems in manufacturing. Statistical studies show that two-thirds of machine parts and mechanisms are solids of revolution and are used in the most crucial units and connections. The deviations of the part surfaces from the geometrically correct form that they represent in drawings significantly affect the accuracy, reliability, and durability of joined parts. The ideal form of the section of a solid of revolution in a plane perpendicular to its axis is a circle. Checking the tbrm of a surface of rotation, therefore, comes down to mea-

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