- 行业: Mining
- Number of terms: 33118
- Number of blossaries: 0
- Company Profile:
The U.S. Bureau of Mines (USBM) was the primary United States Government agency conducting scientific research and disseminating information on the extraction, processing, use, and conservation of mineral resources.
Founded on May 16, 1910, through the Organic Act (Public Law 179), USBM's missions ...
A heavy coal cutter for use in headings and rooms in pillar methods of working. The machine weighs about 12 hundredweight (545 kg) and is usually mounted on a light carriage to suit the mine track. A percussive drill, with extension rods, makes a horizontal cut about 5-1/2 ft (1.68 m) deep and 15 ft (4.57 m) wide at any height in the heading. The central column is tightened between roof and floor about 4-1/2 ft (1.37 m) from the face. The machine can also be used for drilling shotfiring holes.
Industry:Mining
A heavy drag-type or fishtaillike bit having a long grooved shank, the diameter of which is only slightly less than the width of the cutting edges; it is designed for drilling boreholes in formations that mud-up excessively.
Industry:Mining
A heavy drill rod coupled to and having the same diameter as a core barrel on which it is used. It gives additional rigidity to the core barrel and helps to prevent deflection of the borehole.
Industry:Mining
A heavy drill rod coupled to and having the same diameter as a core barrel on which it is used. It gives additional rigidity to the core barrel and helps to prevent deflection of the borehole.
Industry:Mining
A heavy drill rod coupled to and having the same diameter as a core barrel on which it is used. It gives additional rigidity to the core barrel and helps to prevent deflection of the borehole.
Industry:Mining
A heavy drilling machine for quarry or opencast blasting. It has continuous tracks and is operated by independent air motors. It tows its rotary compressor and drills holes 3 in or 4 in (7.6 cm or 10.2 cm) in diameter at any angle, but it is chiefly used for vertical holes up to 80 ft (24.4 m) in depth.
Industry:Mining
A heavy electric rotary drilling machine for blasting work in mine tunneling. It consists of a chassis mounted on continuous tracks, turntable, boom, drilling machines, and various controls, and can be operated by two people.
Industry:Mining
