FIELD: machine-tool industry. SUBSTANCE: drive 1 of drilling spindle 2 is coupled with drill 4 through flexible shaft 3. Flexible shaft 3 is arranged in damping space 18 provided in extension 17 of spindle 2 set in a radial bearing. Vibration device 8 sets the drill holder in radial vibration and is made up as an electromagnet whose magnetic field is pulsating. Stop 22 that arrests the radial deviation of the shaft is mounted on flexible shaft 3. EFFECT: enhanced reliability. 8 cl, 5 dwg
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