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A wide variety of drill bit making machine options are available to you, there are 300 suppliers who sells drill bit making machine on alibaba, mainly located in asia. the top countries of suppliers are india, china, and india, from which the percentage of drill bit making machine supply is 2%, 96%, and 2% respectively.

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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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