FIELD: machine tool manufacture, namely gear milling machine tools for cutting skew teeth gear wheels by worm milling cutter. SUBSTANCE: machine tool is provided with hydraulic step drive mounted in differential mechanism circuit and hydraulic pulse generator mounted in adjusting link of said hydraulic step drive for providing gear ratio corresponding to pulse frequency relation determined by designed number of working circuits for gate valve sleeve of hydraulic pulse generator. EFFECT: simplified structure of kinematic rolling around circuits, differential mechanism, lowered metal consumption, enhanced accuracy of circuits, possibility of cutting cone gear wheels with skew teeth by means of worm milling cutter. 1 dwg
