FIELD: machine-tool industry. SUBSTANCE: connecting pipe 1 is secured inside chuck 4 to spindle 5. Cutting tool 2 made up as a triangle cutter is mounted in tool spindle 12 for permitting reciprocation. The axis of the spindle is shifted and arranged at the right angle to the axis of rotation of spindle 5. Cutting tool 2 performs working strokes and reverse strokes. As a result, some dummy grooves are made in connecting pipe 1. The machine-tool is provided with spindle head 6 that carries spindle 5 and allows the spindle to slide axially with respect to spindle 12. As a result cutting tool 2 leaves the central opening when all grooves have been machined and its working strokes stop. EFFECT: improved design. 5 cl, 6 dwg
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