FIELD: working materials such as stone, concrete, metal by cutting.
SUBSTANCE: drill includes cylindrical rod with head in its end. At least on part of length of cylindrical rod there are several helical diverting grooves. In order to enhance cutting rate and to increase useful life period of drill, said grooves are formed at least along part of their length by row of chamfers arranged one near other.
EFFECT: enhanced cutting rate, lowered cost of making drill.
7 cl, 20 dwg
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