FIELD: working, possibly turning spherical surfaces of openings, for example of bearing races, in machine tools such as lathes. SUBSTANCE: cutter is rotated around axis passing through sphere center with revolution number more than that of article in radial plane of sphere forming angle 
relative to axis of turned opening. Cutter is moved in the same plane until forming spherical surface of predetermined radius. Angle value depends upon sphere radius and width of spherical portion of opening. EFFECT: enhanced surface quality of turned openings. 1 dwg
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