FIELD: machine engineering, designing and making combination-type centering drills with hard-alloy tips. SUBSTANCE: drill includes body and working portion with drilling and countersinking portions monolithically joined one with another and arranged onto hard-alloy tip whose shape is similar to that of said portions. EFFECT: economy of hard alloy due to using as hard-alloy tip worn changeable faceted tip worn to necessary shape of working portion of drill. 2 dwg
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RU2128103C1 |
