DTH DRILL TOOLS USER GUIDE - ANZEVE
2018-3-25 · DTH drill bits are rotary - PERCUSSIVE tools with the emphasis on PERCUSSIVE. Their function is to fracture the material being drilled which should then be immediately carried away by the exhaust air. Button bits have no cutting or tearing action as such and the effect of rapid rotation can be detrimental to the life of the bit,
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