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working principle of mining drilling machine ppt c

working principle of mining drilling machine ppt c

Mar 13 2012 · 1 Drill AdaptabilityThe type of rock drill used in mining drilling is generally determined by the hole diameter required and the mechanical properties principally hardness of the rockA top hammer is commonly employed for drilling of holes less than 125 mm in diameter in all but the hardest rock although a rotary cutting method may instead

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