Gly Down The Hole Hammer Method Mining Rig

Gly Down The Hole Hammer Method Mining Rig

Mar 28, 2006018332With a top hammer, the drill rods are rotated and percussed by the drill head on the rig. With a direct-circulation, down-the-hole hammer, the larger diameter drill rods are only rotated by the drill head, and compressed air fed down the rods activates the percussive hammer mounted directly above the drill bit.

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