A BIT–ROCK INTERACTION MODEL FOR ROTARY–PERCUSSIVE DRILLING

Yining water well drilling rig model

Yining water well drilling rig model

YG series well drilling rig is a kind of lightweight, efficient, multi-functional drilling equipment. With wheel, easy to move and saves operation cost. With ball clamping mechanism instead of chuck, enables implement non-stop down rod. [pdf]

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]

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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