FIELD: metal working. SUBSTANCE: appliance has hollow arbor 1, rotary drive 3, rest 4, bushing 5 with socket 6 for part 7, retainer made in the form of slide with two rollers 10. Inner surface of hollow arbor 1 is provided with projection 11 of variable cross- section intended for engagement with variable cross-section groove 16 available on tap shank 2. Tap has guide section 14 with groove 15 intended for engagement with retainer rollers 10. In the process of work tap is fixed alternately either in hollow arbor 1 by means of projection 11, or in bushing 5 by means of retainer rollers 10. EFFECT: improved efficiency. 2 cl, 12 dwg
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