FIELD: machine tool manufacture. SUBSTANCE: screw cutting circuit of machine tool includes step hydraulic motors kinematically joined by means of leading screws for lengthwise and crosswise feed of tool and worm gearing respectively with lengthwise rest, cross cutter carriage and adding mechanism in the form of differential with cone gear wheels. Each step hydraulic motor is controlled by separate hydraulic pulse generator. EFFECT: simplified design, enhanced accuracy due to lowered length of circuit in the result of reduced number of mechanical transmissions, lowered metal consumption. 1 dwg
