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Use one hand to hold the drill bit in place. tighten the jaws of the drills chuck by turning the metal chuck key with your other hand in a clockwise manner. tighten the chuck jaws as firmly as possible. remove the chuck key, and take your hand off the bit. test the drill to see if it is drilling properly.

One-stop-shop – a total solution we offer a complete range of dth drilling tools including hammers, bits, pipes, adapters, reverse circulation products, breakout benches and grinding machines with consumables. innovation and commitment over the decades the history of the down-the-hole hammer manufacturing goes back more than four decades.

Aug 14, 2020 · since its beginning in 1985, numa has become a major manufacturer of dth hammers and bits for the domestic and international drilling industry. the company designs and builds downhole hammers and bits for drilling vertical and horizontal holes 3½ to 50½ inches (89 to 1,283 millimeters) in diameter. to learn more, visit www.numahammers.

The optimum range of hole size for dth drilling is 90 mm (3.5”) to 254 mm (10”). smaller holes are generally drilled using tophammer drill rigs, and larger holes generally use rotary drill rigs. as a rule of thumb, the smallest hole diameter a dth hammer can drill is its nominal size. i.e. standard 102 mm (4”) hammer will drill a hole down to a minimum diameter of 102 mm (4”).

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