FIELD: metal working, electromechanical working of parts such as shafts, sleeves, tubes. SUBSTANCE: power step-down transformer and working tool are mounted on movable foundation of machine tool. Transformer includes core, primary winding, secondary circuit providing electric current applying to part mounted in machine tool with possibility of rotation. Core of transformer is annular one and worked part is coaxially arranged at minimum working gap in its opening. At working mode of apparatus worked part is secondary winding of transformer. EFFECT: simplified design providing lowered cost of technological operations, reduced metal consumption, enhanced efficiency of working process. 1 dwg
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