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rapid blow drilling

A drilling method utilizeing a great number of short blows in quick succession rather than a few heavy blows from a relatively considerable altitude. In this method, the bit is fixed either to a rod or to a rope, so that it pounds the bottom in quick succession with short blows and at the same time rotates.

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  • ed.young
  • (Milwaukee, United States)

  •  (V.I.P) 21084 puntos
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