Rotary drilling is a type of drilling technology used in mining industries mostly for soft rock type like the sedimentary rock, and less frequently for hard rocks. Rotary drilling is one of the most popular drilling techniques for large surface mines where large diameter holes are used in blasting.
There are four main functional components of a drilling system:
drill (energy source)
rod (energy transmitter)
bit (energy applicator)
These components are related to the utilization of energy by the drilling system in attacking rock in the following ways:
The drill is the prime mover, converting energy from its original form (electrical, pneumatic, or combustion-engine drive) into mechanical energy to actuate the system
The rod (or drill steel, stem or pipe) transmits energy from the prime mover or
source to the bit or applicator
The bit is the applier of energy in the system, attacking rock mechanically to
The fluid cleans the hole, controls dust, cools the bit, and at times stabilizes the
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