102:
165:
122:, who worked unsuccessfully as a silver miner in the early 1860s before taking up journalism, described the process: "One of us held the iron drill in its place and another would strike with an eight-pound sledge--it was like driving nails on a large scale. In the course of an hour or two the drill would reach a depth of two or three feet, making a hole a couple of inches in diameter." This hole was then filled with the blasting powder. In "jump-driving", a team of 2-4 men worked a single hole, each taking turns pounding. Around 1900, the average jump-driver could produce 50 feet (15 m) of hole a day.
27:
197:
204:
Rock is hard and would quickly wear out a plain steel drill bit. Typically the drill is tipped with an insert of a much harder material that can be replaced as it wears away, such as tungsten carbide. The differential wear between different bits used to make a single hole could result in an uneven
172:
In reciprocating power drills, the drilling cylinder is mounted on a feed-screw, such that as the hole is drilled and the drilling point recedes from the rock face, the drill-bit continues to move into it, while the anchor point (on the tripod or column) remains in place. The drill bit has to be
176:
Rock drills may be mounted for anchoring against the rockface in several different ways. For downward vertical drilling, particularly in quarrying, rock drills may be mounted on tripods with attached weights so as to provide sufficient pressure against the surface. For horizontal drilling, jack
216:). The diamonds are set into metal or ceramic such that the harder diamond protrudes as the softer material wears, shielding the bulk from further wear until the diamond slowly wears away. For drilling through ice or frozen soil, heated drill bits may be used
205:
hole in which a blasting charge might not properly fit. This was a potentially dangerous situation with relatively unstable explosives, such as dynamite, if they were forced. To prevent this, a tool was used for measuring the individual bits and the hole.
105:
A pneumatic rock drill. The detacheable drill bit is not shown, but would be at left. At the bottom is the feed-screw (worked by the crank at right), which advances the drill as the hole deepens. The mounting point is at the
151:
among ancient miners. Modern rock drills flood the borehole with water to capture the dust and improve the air quality in the mine. This has the additional benefits of lubricating and cooling the drill bit. In 1867, French
125:
Powered rock drills eventually replaced the manual use of a chisel to bore holes by the turn of the 20th century. The dramatic differences between the hand steel and power drills was the basis for the legend of
American
73:
While a rock drill may be as simple as a specialized form of chisel, it may also take the form of a powered machine. The mechanism may be worked or powered by hand, by steam, by compressed air (pneumatics), by
228:, an American inventor from Philadelphia, received the first patent for a rock drill. It featured a drill rod which passed through a hollow piston and was thrown against the rock.
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133:, who according to folklore undertook a competition pitting his hand steel against a steam power drill, only to collapse dead when victorious.
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140:. Steam drills found greater use in surface quarries than in underground mines, as there they could be much closer to the requisite
180:
A quarry bar consists of a rock drill mounted to a long rod, such that the rock drill may be moved along it. This tool is used in
81:
Machine rock drills come in two basic forms: those that operate by percussion (using a reciprocating motion), and those that are
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changed out for a longer one every 12 to 30 inches (30 to 76 cm), depending on the length of the feed screw.
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Rock drill mounted on a tripod. The large objects on the legs are weights to anchor it down into position
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mounts or columns may be used, which lock into the ceiling and floor for the drill to push against.
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Rock
Blasting: A Practical Treatise on the Means Employed in Blasting Rocks for Industrial Purposes
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514:. London: "The Electrician" Printing and Publishing Company Ltd. pp. 79–80.
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All rock drills produce dust which is hazardous to inhale, causing widespread
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motion). A smaller, hand-held percussion rock drill is considered a type of
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received a patent for a rock drill powered by steam or compressed air.
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475:. Pittsburgh: National Fire Proofing Company. pp. 35–44.
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to produce a straight row of holes, such as for use with the
110:
The simplest form of rock drill consists of a long chisel or
30:
Power rock drill, mounted on a column, in operation in a mine
345:. Hartford, Conn.: American Publishing Company. p. 212.
455:. Pittsburgh, PA.: W. J. Golder & Co. pp. 84–85.
438:. London, Ont.: Advertiser Steam Presses. pp. 7–8.
533:. Easton, Pa.: American Institute of Mining Engineers.
328:. Easton, Pa.: American Institute of Mining Engineers.
309:. Easton, Pa.: American Institute of Mining Engineers.
273:. New York: Chasmar-Winchell Press. pp. 39, 41.
262:
260:
58:. Rock drills are used for making holes for placing
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858:
820:
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783:
735:
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16:
Hydraulic or pneumatic powered rock or ground drill
374:"Taking Swings at a Myth, With John Henry the Man"
200:Various rock drills and bits at a museum in Japan
19:"Rock drill" redirects here. For other uses, see
398:. New York: McGraw-Hill Book Company. p. 1.
136:The first steam drill was developed in 1813 by
464:
462:
156:M. Leschott introduced the diamond drill bit.
620:
8:
290:. London: Crosby Lockwood. pp. 151–152.
208:Rotary rock drills often use bits coated in
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605:
531:Glossary of Mining and Metallurgical Terms
503:
501:
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427:
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395:Rock Drills: Design, Construction, and Use
326:Glossary of Mining and Metallurgical Terms
307:Glossary of Mining and Metallurgical Terms
188:to split the stone along the given line.
100:
418:. London: Crosby Lockwood. p. 156.
256:
550:. New York: McGraw-Hill. p. 135.
362:. New York: McGraw-Hill. p. 136.
7:
452:The Quarryman and Contractor's Guide
270:The Excavation of Rock by Machinery
267:Sullivan Machinery Company (1903).
382:, Books section, October 18, 2006.
14:
415:Machinery for Metalliferous Mines
287:Machinery for Metalliferous Mines
486:André, George Guillaume (1878).
589:. Cornish Mining World Heritage
492:. London: E. & F. N. Spon.
469:Cosgrove, John Joseph (1913).
1:
562:"From gunpowder to Pit Viper"
508:Maurice, William (c. 1910).
472:Rock Excavating and Blasting
392:Weston, Eustace M. (1910).
21:Rock drill (disambiguation)
1030:
544:Marsh Jr., Robert (1920).
356:Marsh Jr., Robert (1920).
18:
986:
412:Davies, E. Henry (1902).
284:Davies, E. Henry (1902).
432:Le Ruey, Edward (1877).
435:Hints on Mining Affairs
114:that was struck with a
62:or other explosives in
1009:Construction equipment
770:Bucket chain excavator
765:Bucket-wheel excavator
525:Raymond, R.W. (1881).
511:The Shot-Firer's Guide
320:Raymond, R.W. (1881).
301:Raymond, R.W. (1881).
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449:Kirk, Arthur (1891).
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78:, or by electricity.
38:, sometimes called a
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988:Part of a series on
755:Rocker Shovel Loader
339:Twain, Mark (1891).
547:Steam Shovel Mining
359:Steam Shovel Mining
923:Articulated hauler
760:Dragline excavator
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138:Richard Trevithick
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42:is a tool used in
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372:Grimes, William.
220:Early rock drills
97:History and types
48:civil engineering
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903:Material ropeway
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703:Blasting machine
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36:drifter drill
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968:Carbide lamp
866:Mine railway
796:Gold panning
791:Fire-setting
748:Steam shovel
743:Power shovel
712:Blasting cap
675:Sledgehammer
591:. Retrieved
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569:. Retrieved
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116:sledgehammer
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973:Ventilation
953:Safety lamp
891:Slate wagon
775:Gold dredge
342:Roughing It
245:Churn drill
233:James Fowle
226:J. J. Couch
112:drill steel
70:quarrying.
40:rock drill,
1003:Categories
918:Haul truck
886:Quarry tub
859:Horizontal
850:Man engine
680:Jackhammer
665:Hand steel
641:Excavation
251:References
192:Drill bits
131:John Henry
120:Mark Twain
91:jackhammer
76:hydraulics
933:Reclaimer
833:Headframe
814:Transport
727:Gunpowder
708:Detonator
231:In 1851,
224:In 1849,
182:quarrying
149:silicosis
128:folk hero
85:(using a
963:Headlamp
881:Pit pony
876:Mine car
871:Minecart
821:Vertical
722:Dynamite
695:Blasting
593:July 18,
587:"Drills"
571:July 18,
239:See also
83:abrasive
60:dynamite
928:Stacker
907:Blondin
898:Mantrip
801:Hushing
670:Crowbar
655:Pickaxe
322:"drill"
210:diamond
142:boilers
106:bottom.
990:mining
946:Safety
717:Dualin
685:Gezähe
660:Shovel
87:rotary
44:mining
828:Hoist
784:Other
648:Tools
565:(PDF)
54:into
52:drill
978:SCSR
845:Whim
595:2012
573:2012
214:bort
56:rock
46:and
50:to
1005::
710:/
529:.
498:^
461:^
424:^
404:^
376:,
324:.
305:.
259:^
144:.
118:.
93:.
34:A
909:)
905:(
628:e
621:t
614:v
597:.
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23:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
