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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.

Dth hammer bit, dth hammer price, dth hammer button bits manufacturer / supplier in china, offering 6 inch dhd forging dth hammer for well drilling, t45-89mm button bit, t38 64mm-89mm flat drop centre retract thread button bit and so on.

For efficient down-the-hole (dth) drilling, sandvik offers high performance drilling tools to increase your productivity and reduce your total operation cost. sandvik develops tools in close cooperation with the customers to maximize performance and optimize user experience. request a quote find an office

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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