A BIT–ROCK INTERACTION MODEL FOR ROTARY–PERCUSSIVE DRILLING

Hulunbuir water well drilling rig model

Hulunbuir water well drilling rig model

The HD55 uses the same frame as its heavier-duty stable mate, the HD77, and provides the ideal balance of power, features and portability for lighter commercial applications where maximum portability and a greater depth range are needed at an affordable price. [pdf]

Jining down-the-hole anchor drilling rig model

Jining down-the-hole anchor drilling rig model

Built for mobility and precise down-the-hole drilling in small to mid-scale construction sites, JC710 offers a balanced combination of compact design, efficient power transmission, and stable hole-forming performance. [pdf]

Does model r860052sbn rigid cordless drill have all metal gears

Does model r860052sbn rigid cordless drill have all metal gears

Featuring all metal gears for added durability, this 18-Volt Lithium-Ion Cordless 2-Speed 1/2 in. Compact Drill/Driver Kit is the perfect addition to your toolkit. Each kit includes Drill/Driver, 2 Batteries, Charger, and Tool Bag. [pdf]

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