DEVICE FOR MEASUREMENT OF THREAD MEAN DIAMETER Russian patent published in 1996 - IPC

FIELD: measurement equipment, in particular, devices for measurement of outside diameters of cylindrical parts and thread mean diameter. SUBSTANCE: outside diameter of the thread to be measured is preliminarily aligned with the inserts. Rotating the drum of the measuring micrometer, the parts are moved apart. Rotating the micrometer ratchet, the inserts are brought to their engagement with the surface of the thread under check, and the thread mean diameter is determined by reference to the micrometer. EFFECT: enhanced accuracy. 2 cl, 4 dwg