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For example, the Bosch and Hilti 12 lb (5.4 kg) tools both use SDS-max, while the Bosch, Hilti, and Makita 65 lb (29 kg) tools all use 1+1/8 in hex connection. See hammer drills for more on electropneumatic hammering.
The cable tool drilling machines developed by the early Chinese involved raising and dropping a heavy string of drilling tools to crush through rocks into diminutive fragments. [9] In addition, the Chinese also used a cutting head secured to bamboo rods to drill to depths of 915 m (3,002 ft). [ 10 ]
A magnetic drill is a portable machine for drilling holes in large and heavy workpieces which are difficult to move or bring to a stationary conventional drilling machine. It has a magnetic base and drills holes with the help of cutting tools like annular cutters (broach cutters) or with twist drill bits .
The free mass vibrates between the drill stem and the horn of the actuator to transmit the vibrations down the drill stem. The drill stem houses the drill bit, and the vibrations push the bit into the material. The repetitive impact on the drill stem by the free mass, creates stress pulses that transmit to the tip of the bit and into the rock.
The Petrol Engine Driven Rail Drilling Machine or most commonly known as Petrol Rail Drilling Machine runs on Benzin (petrol). This machine is equipped with a petrol engine generally of 1500 Watt (2 HP). The Petrol Rail Drilling Machines are ideal machines when drilling in a remote location where there is no availability of electricity.
The front of the machine is equipped with a stationary drill tip which is kept at 700–930 °C (1,300–1,700 °F). The molten rock is pushed around the edges as the vehicle is forced forward, and cools to a glass-like lining of the tunnel. Massive amounts of energy are required to heat the drill head, supplied via nuclear power or electricity.