Core drill

Core drill
Truck mounted core drill

A core drill is a drill specifically designed to remove a cylinder of material, much like a hole saw. The material left inside the drill bit is referred to as the core.

Core drills are used for many applications, either where the core needs to be preserved (the drilling apparatus used in obtaining a core sample is often referred to as a corer), or where drilling can be done more rapidly since much less material needs to be removed than with a standard bit. This is the reason that diamond-tipped core drills are commonly used in construction to create holes for pipes, manholes, and other large-diameter penetrations in concrete or stone.

Core drills are used frequently in mineral exploration where the coring may be several hundred to several thousand feet in length. The core samples are recovered and examined by geologists for mineral percentages and stratigraphic contact points. This gives exploration companies the information necessary to begin or abandon mining operations in a particular area.

Before the start of World War Two, Branner Newsom, a California mining engineer, invented a core drill that could take out large diameter cores up to 16 feet in length for mining shafts. This type of core drill is no longer in use as modern drill technology allows standard drilling to accomplish the same at a much cheaper cost. (see external links)

Core drills come with several power choices including electric, pneumatic, hydraulic (all of which require power sources, such as a generator).

External Links

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Look at other dictionaries:

  • core-drill — «KR DRIHL, KOHR », transitive verb.defu>to drill so as to remove a core intact …   Useful english dictionary

  • core drill — noun a drill that removes a cylindrical core from the drill hole • Hypernyms: ↑drill • Part Meronyms: ↑core bit * * * noun : a drill that removes a cylindrical core from the drill hole compare diamond drill, shot drill • …   Useful english dictionary

  • core drill — noun A device used to remove a cylinder shaped sample of material for examination …   Wiktionary

  • Diamond core drill — bits (sometimes called hole saws) are used to bore holes in brick, concrete, glass, and stone. They are not generally used with softer materials. The bit consists of a metal cylinder, usually relatively soft steel mounted on an arbor. Industrial… …   Wikipedia

  • Drill bit — For the fictional character, see Drill Bit (Transformers). For the cancelled skyscraper nicknamed Drill bit, see Chicago Spire. For the types used in drilling wells, see Well drilling. From top to bottom: Spade, lip and spur (brad point), masonry …   Wikipedia

  • Core sample — Rock core samples. The product of a Diamond rig. (The bird is a Pied Butcherbird.) A core sample is a cylindrical section of (usually) a naturally occurring substance. Most core samples are obtained by drilling with special drills into the… …   Wikipedia

  • core bit — noun a hollow drilling bit that is the cutting part of a core drill; allows core samples to be taken • Hypernyms: ↑drilling bit, ↑drill bit • Part Holonyms: ↑core drill * * * noun : a hollow cylindrical bit that is the cutting part of a core… …   Useful english dictionary

  • core barrel — noun 1. : a tube inside a drill pipe and supported by a bit to receive the core in core boring 2. : a tube usually of iron on which a foundry loam core is formed * * * (in a core drill) a length of pipe for holding rock cores while they are being …   Useful english dictionary

  • core barrel — (in a core drill) a length of pipe for holding rock cores while they are being extracted from the drill hole. * * * …   Universalium

  • drill core — noun The long cylinder of material obtained by use of a core drill …   Wiktionary

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