FIELD: mechanical engineering. SUBSTANCE: device has two instruments for measuring of external and internal races containing cones moving along axis of measured race, measuring balls positioned over circumference of cones and along raceways of measured races, bushings contacting the measuring balls and moving along axis of bushing cones, and transducers which transform cone and bushing displacement into electric signal during measurement of races. In each instrument output of cone displacement transducer is connected to the first input of subtracting unit and to scaling unit input. Output of scaling unit is connected to the first input of recording unit. Output of bushing displacement transducer is connected to the first input of adding unit and to the second unit of subtracting unit which output is connected to the second input of adding unit. Output of adding unit is connected to the second input of recording unit. Instrument for measuring of external races includes ball size setting unit which output is connected to the second input of scaling unit. The device allows assembly of bearings with races which sizes exceed permissible deviations. EFFECT: higher efficiency. 5 dwg
