FIELD: electrical engineering. SUBSTANCE: device has machine vice 2 with orientating jaws 3. Jaws key unit in vice body is made in form of key 4 getting into keyway 5. Height of key 4 exceeds depth of keyway 5. Jaws 3 are secured on housing by bolts 6 turned into bushings 7. Jaws are coupled by band springs 8 secured on elongated portions 9 of jaws by screws 10 and interconnected by bolt 11 and nut 12. EFFECT: improved process of turning of commutator bars in machine tool at milling of slot for riser with provision of required shape and dimensions. 2 cl, 2 dwg
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