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establishment of the beat, schlagbohren or drehschlagbohren
establishment of the beat, schlagbohren or drehschlagbohren
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机译:节拍,打击钻或旋转打击钻的建立
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摘要
A drill element in the form of a drill rod, a sleeve for coupling together two drill rods or a drill bit; the drill element having a single start internal or external cylindrical screw thread by which it is intended to be coupled to a further drill element in the assembly of a drill string for percussion or rotary/percussion drilling.
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