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New process for piston machining with DTH hammer

New process for machining perforator pistons,The fatigue strength, microhardness, abrasion resistance, corrosion resistance and other properties of DTH Hammers surfaces are greatly improved.       ...

Which is better, a straight bit or a cross bit?

Cross-shaped drill bits, featuring a cross-shaped hard alloy blade welded to the top, are commonly used in mining, tunneling, and construction projects for drilling rock or coal formations efficiently...