FIELD: mechanics, tools.
SUBSTANCE: proposed drill comprises cylindrical shank and working part comprising two main cutting edges and crosswise edge, two cutting teeth and two grooves running, alternating, about the drill axis of rotation. Every cutting tooth has tape, while every groove incorporates main front surface adjoining the said tape and main cutting edge. At least, the drill working part is made in plastic material. Note here that the drill front angle is positive. The drill rear surface passes from every main cutting edge at rear angle making approximately 4° to 10° relative the plane perpendicular to the drill axis of rotation. Two cuts that form two secondary front surfaces of the drill pass from crosswise edge at positive front angles making about 1° to 7° to the drill axis of rotation.
EFFECT: higher drill strength and drilling efficiency.
23 cl, 4 dwg
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