a. A rotary boring bit consisting of two to four cone-shaped, toothed rollers that are turned by the rotation of the drill rods. Such bits are used in hard rock in oil well boring and in other deep holes down to 5,000 m and more. See also: tricone bit; drag bit. Nelson
b. A type of rock-cutting bit used on diamond and rotary drills. The bit consists of a shank with toothed, circular, or cone-shaped cutter parts affixed to the head of the bit in such a manner that the cutters roll as the bit is rotated. Generally used for drilling 10-cm-size or larger holes in soft to medium-hard rocks, such as shale and limestone. Usually noncoring and not diamond set. Also called cone bit. CF: noncoring bit See also: rock bit; roller rock bit. Syn: roller cone bit; roller-cutter bit; rolling cutter bit; toothed roller bit. Long
Source: Dictionary of Mining, Mineral, and Related Terms












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