FIELD: well drilling equipment, particularly to drill bores and wells, as well as rock and artificial non-conductive material cutting.
SUBSTANCE: drill comprises body, drilling bit provided with high-voltage current conductor and electrode secured in longitudinal slots thereof by means of insulator. Drilling bit has movable electrode, which projects from drilling bit end and movable electrode travel limiter. Drill body is connected with rotary unit through torque-limiting clutch.
EFFECT: increased efficiency of rock cutting due to increased number of electric discharges, which have been introduced in rock to be cut.
5 cl, 8 dwg
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