FIELD: process engineering.
SUBSTANCE: drill comprises body with lengthwise axis and, at least, one end surface with drive element made in joint with, at least, one end surface, at least, one cartridge adjoining said end surface to displace relative thereto to interact with drive element for it to be actuated. Note here that, at least, one cartridge comprises cutting surface including, at least, one cutting plate seat arranged adjoining drill body edge, system to fasten, at least, one cartridge to drill body and, at least, one cutting plate fitted in its seat. In compliance with another version, at least one cartridge comprises cutting surface with, at least, one cutting plate seat and, at least, one cutting plate fitted in its seat, while drill has central cutting system.
EFFECT: expanded performances.
24 cl, 22 dwg
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