نمایش نتیجه 1 تا 2 از 2 نتیجه یافت شده برای rollercone bit:
n: any bit. such as a diamond bit. whose cutting elements do not move on the face. or head. of the bit. Compare rollercone bit.
n: a drilling bit made of two, three, or four cones, or cutters, that are mounted on extremely rugged bearings. The surface of each cone is made of rows of steel teeth or rows of tungsten carbide inserts. Also called rock bit.
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