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4 FAQs about [Coal mine rock drill nozzle installation video]
How do you drill a hole for solution mining?
Drill boreholes for solution mining. Drill water wells to provide water for the mine, or to monitor groundwater conditions. Obtain either cores or cuttings for exploration purposes. This is a fairly complete list. While the drilling equipment may look differently depending on the application, the principles are similar.
What is the resistance of a rock to drilling?
The resistance of the rock to drilling is termed its drilling strength. This is an empirical term used to make comparisons, but it is not quantified in the way we can quantify engineering parameters such as compressive strength or strain, for example.
Why do percussion drills index the chisel bit after each strike?
If we want to achieve a better penetration rate, we need to index our chisel bit; i.e., after each strike, we need to rotate the chisel edge by say 15°. This results in dramatically improved penetration. Thus, percussion drills index the bit after each strike.
How big is a hole in a mine?
These include hole size, length, and inclination; they are dictated by outside requirements and thus are largely uncontrollable. Hole diameters in surface mining are typically 6 to 18 in. (150 to 450 mm); underground, they typically range from 1.5 to 7 in. (40 to 175 mm).