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 used in metal are called annular cutters. Core drills used for concrete are generally called Diamond Core Drills and are water cooled.[1] For drilling masonry, carbide core drills can be used.[2]

The earliest core drills were those used by the ancient Egyptians, invented in 3000 BC.[3] 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.

Oriented Core Goniometer commonly used when logging core
Oriented Core Goniometer commonly used when logging core and analyzing contacts and other structural features.

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.[4]

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

Core drill 06 2005
Truck mounted core drill

See also


  1. ^ "Diamond Core Bits vs Carbide Core Bits". Retrieved 4 August 2014.
  2. ^ "Concrete Drilling Tutorial". Retrieved 4 August 2014.
  3. ^ Jacques W. Delleur (12 December 2010). The Handbook of Groundwater Engineering, Second Edition. Taylor & Francis. p. 7 in chapter 2. ISBN 978-0-8493-4316-2.
  4. ^ Boone, Andrew R. (December 1943). "He Bores Bigger Holes". Popular Science: 104–107.
Annular cutter

An annular cutter (also called as core drill, core cutter, broach cutter, trepanning drill, hole saw, or cup-type cutter) is form of core drill used to create holes in metal. An annular cutter cuts only a groove at the periphery of the hole and leaves a solid core or slug at the center.An annular cutter is a more expensive and more efficient alternative to spiral drill bits and standard hole saws. An annular cutter is similar to a hole saw but differs in geometry and material. The two most common types are high-speed steel (HSS) and tungsten carbide tipped (TCT).

Like a hole saw, but unlike a spiral drill bit, an annular cutter cuts only the periphery of a hole, leaving a circular "slug" at the center.Annular cutters are available from 12 mm (1/2’’) diameter to 200 mm (7 7/8’’) and larger. Depths of 30 mm, 55 mm, 75 and 110 mm are commonly available.

Annular cutters are best used with a drill press or magnetic drilling machine, both for their stability against high torque forces created by such a drill bit and lower RPMs compared to other types of drills.

Astrobiology Field Laboratory

The Astrobiology Field Laboratory (AFL) (also Mars Astrobiology Field Laboratory or MAFL) was a proposed NASA unmanned spacecraft that would have conducted a robotic search for life on Mars. This proposed mission, which was not funded, would have landed a rover on Mars in 2016 and explore a site for habitat. Examples of such sites are an active or extinct hydrothermal deposit, a dry lake or a specific polar site.Had it been funded, the rover was to be built by NASA's Jet Propulsion Laboratory, based upon the Mars Science Laboratory rover design, it would have carried astrobiology-oriented instruments, and ideally, a core drill. The original plans called for a launch in 2016, however, budgetary constraints caused funding cuts.

Bank vault

A bank vault is a secure space where money, valuables, records, and documents are stored. It is intended to protect their contents from theft, unauthorized use, fire, natural disasters, and other threats, much like a safe. Unlike safes, vaults are an integral part of the building within which they are built, using armored walls and a tightly fashioned door closed with a complex lock.

Historically, strongrooms were built in the basement of a bank where the ceilings were vaulted, hence the name. Modern bank vaults typically contain many safe deposit boxes, as well as places for teller cash drawers, and other valuable assets of the bank or its customers. They are also common in other buildings where valuables are kept such as post offices, grand hotels, rare book libraries and certain government ministries.

Vault technology developed in a type of arms race with bank robbers. As burglars came up with new ways to break into vaults, vault makers found new ways to foil them. Modern vaults may be armed with a wide array of alarms and anti-theft devices. Some 19th and early 20th century vaults were built so well that today they are difficult to destroy. These older vaults were typically made with steel-reinforced concrete. The walls were usually at least 1 ft (0.3 m) thick, and the door itself was typically 3.5 ft (1.1 m) thick. Total weight ran into the hundreds of tons (see the Federal Reserve Bank of Cleveland). Today vaults are made with thinner, lighter materials that, while still secure, are easier to dismantle than their earlier counterparts.

Core sample

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 substance, for example sediment or rock, with a hollow steel tube called a core drill. The hole made for the core sample is called the "core bowling". A variety of core samplers exist to sample different media under different conditions. More continue to be invented on a regular basis. In the coring process, the sample is pushed more or less intact into the tube. Removed from the tube in the laboratory, it is inspected and analyzed by different techniques and equipment depending on the type of data desired.

Core samples can be taken to test the properties of manmade materials, such as concrete, ceramics, some metals and alloys, especially the softer ones. Core samples can also be taken of living things, including human beings, especially of a person's bones for microscopic examination to help diagnose diseases.

Diamond segment

Diamond segments are the function parts of a metal-bonded diamond tool. The metal-bonded diamond tool can be a metal-bonded diamond blade, a diamond grinding cup wheel, a diamond core drill bit, a diamond gang saw blade, etc. The diamonds of a metal-bonded diamond tool are all in the tool's diamond segments to play their role of cutting or grinding.

Diamond tool

A diamond tool is a cutting tool with diamond grains fixed on the functional parts of the tool via a bonding material or another method. As diamond is a superhard material, diamond tools have many advantages as compared with tools made with common abrasives such as corundum and silicon carbide.

Drill bit

Drill bits are cutting tools used to remove material to create holes, almost always of circular cross-section. Drill bits come in many sizes and shapes and can create different kinds of holes in many different materials. In order to create holes drill bits are usually attached to a drill, which powers them to cut through the workpiece, typically by rotation. The drill will grasp the upper end of a bit called the shank in the chuck.

Drill bits come in standard sizes, described in the drill bit sizes article. A comprehensive drill bit and tap size chart lists metric and imperial sized drill bits alongside the required screw tap sizes. There are also certain specialized drill bits that can create holes with a non-circular cross-section.While the term drill may refer to either a drilling machine or a drill bit while in use in a drilling machine, in this article, for clarity, drill bit or bit is used throughout to refer to a bit for use in a drilling machine, and drill refers always to a drilling machine.

Exploration diamond drilling

Exploration diamond drilling is used in the mining industry to probe the contents of known ore deposits and potential sites. By withdrawing a small diameter core of rock from the orebody, geologists can analyse the core by chemical assay and conduct petrologic, structural and mineralogical studies of the rock.

Gurren Lagann

Gurren Lagann, known in Japan as Tengen Toppa Gurren Lagann (天元突破グレンラガン, Tengen Toppa Guren Ragan, lit. "Pierce the Heavens, Gurren Lagann"), is a Japanese mecha anime television series animated by Gainax and co-produced by Aniplex and Konami. It ran for 27 episodes on Japan's TV Tokyo between April 1, 2007, and September 30, 2007. It was directed by Hiroyuki Imaishi, written by veteran playwright Kazuki Nakashima, and had been in development since the participation of the famed animator in the Abenobashi mecha-themed episodes by the same studio. Gurren Lagann takes place in a fictional future where Earth is ruled by the Spiral King, Lordgenome, who forces mankind to live in isolated subterranean villages. The plot focuses on two teenagers, Simon and Kamina, who live in a subterranean village and wish to go to the surface. Using a mecha known as Lagann, Simon and Kamina reach the surface and start fighting alongside other humans against Lordgenome's forces, before fighting the forces of their true enemy.

In North America, although initially announced to be licensed by ADV Films in 2007, the license was transferred to Bandai Entertainment in 2008 and then transferred to Aniplex of America in 2013. In the United Kingdom, it was licensed by Manga Entertainment in 2007, then transferred to Beez Entertainment in 2008, and then transferred to Anime Limited in 2013. The Sci Fi Channel acquired the broadcasting rights of Gurren Lagann and began airing the anime on July 28, 2008, as part of Sci Fi's Ani-Monday anime block. The anime won several awards at the Tokyo International Anime Fair and the Animation Kobe and Japan Media Arts Festivals.A manga adaptation was published by ASCII Media Works between 2007 and 2013. Bandai Entertainment licensed the manga and released it in English in North America. A series of four light novels was published by Shogakukan between 2007 and 2008. A Nintendo DS video game was released in October 2007, bundled with a special episode of the anime series. Two animated film versions were produced; the first premiered in Japanese theaters on September 6, 2008, and the second premiered on April 25, 2009.

Hole saw

A hole saw (also styled holesaw), also known as a hole cutter, is a saw blade of annular (ring) shape, whose annular kerf creates a hole in the workpiece without having to cut up the core material. It is used in a drill. Hole saws typically have a pilot drill bit (arbor) at their center to keep the saw teeth from walking. The fact that a hole saw creates the hole without needing to cut up the core often makes it preferable to twist drills or spade drills for relatively large holes (especially those larger than 25 millimetres (1.0 inch)). The same hole can be made faster and using less power.

The depth to which a hole saw can cut is limited by the depth of its cup-like shape. Most hole saws have a fairly short aspect ratio of diameter to depth, and they are used to cut through relatively thin workpieces. However, longer aspect ratios are available for applications that warrant them.

Cutting with a hole saw is analogous to some machining operations, called trepanning in the trade, that swing a cutter analogous to a fly cutter in order to achieve a similar result of annular kerf and intact core.


Magnetostratigraphy is a geophysical correlation technique used to date sedimentary and volcanic sequences. The method works by collecting oriented samples at measured intervals throughout the section. The samples are analyzed to determine their characteristic remanent magnetization (ChRM), that is, the polarity of Earth's magnetic field at the time a stratum was deposited. This is possible because volcanic flows acquire a thermoremanent magnetization and sediments acquire a depositional remanent magnetization, both of which reflect the direction of the Earth's field at the time of formation. This technique is typically used to date sequences that generally lack fossils or interbedded igneous rock.

Mars 2020

Mars 2020 is a Mars rover mission by NASA's Mars Exploration Program with a planned launch on 17 July 2020, and touch down in Jezero crater on Mars on 18 February 2021. It will investigate an astrobiologically relevant ancient environment on Mars and investigate its surface geological processes and history, including the assessment of its past habitability, the possibility of past life on Mars, and the potential for preservation of biosignatures within accessible geological materials. It will cache sample containers along its route for a potential future Mars sample-return mission.The currently unnamed Mars 2020 mission was announced by NASA on 4 December 2012 at the fall meeting of the American Geophysical Union in San Francisco. The rover's design is derived from the Curiosity rover, and will use many components already fabricated and tested, including different scientific instruments and a core drill.NASA announced in June 2019 that a student naming contest will be held in fall of 2019 to determine the name of the rover.

Mars Astrobiology Explorer-Cacher

The Mars Astrobiology Explorer-Cacher (MAX-C), also known as Mars 2018 mission was a NASA concept for a Mars rover mission, proposed to be launched in 2018 together with the European ExoMars rover. The MAX-C rover concept was cancelled in April 2011 due to budget cuts.The rover would have been solar powered, with a maximum mass of 300 kg and based largely on the Curiosity rover components, but would have entailed a system tailored to the specific payload. The MAX-C rover would have performed an in-situ astrobiological exploration, evaluate the habitability potential of various Martian environments, and it would have collected, documented, and cached samples for potential return to Earth by a future mission.

Mars Multispectral Imager for Subsurface Studies

Mars Multispectral Imager for Subsurface Studies (MA-MISS) is a miniaturized imaging spectrometer designed to provide imaging and spectra by reflectance in the near-infrared (NIR) wavelength region and determine the mineral composition and stratigraphy. The instrument is part of the science payload onboard the European Rosalind Franklin rover, tasked to search for biosignatures, and scheduled to land on Mars in 2021. MA-MISS is essentially inside a drill on the Rover, and will take measurements of the sub-surface directly.

MA-MISS will help on the search for biosignatures by studying minerals and ices in situ before the collection of samples. The instrument is integrated within the Italian core drill system called DEEDRI, and it will be dedicated to in situ studies of the mineralogy inside the excavated holes in terms of visible and infrared spectral reflectance.The Principal Investigator is Maria Cristina De Sanctis, from the INAF (Istituto di Astrofisica Spaziale e Fisica Cosmica) in Italy.


MicrOmega-IR is an infrared hyperspectral microscope that is part of the science payload on board the European Rosalind Franklin rover, tasked to search for biosignatures on Mars. The rover is planned to land on Mars in 2021. MicrOmega-IR will analyse in situ the powder material derived from crushed samples collected by the rover's core drill.

Raman Laser Spectrometer

Raman Laser Spectrometer (RLS) is a miniature Raman spectrometer that is part of the science payload on board the European Space Agency's Rosalind Franklin rover, tasked to search for biosignatures and biomarkers on Mars. The rover is planned to be launched in July 2020 and land on Mars in March 2021.

Raman spectroscopy is a very useful technique employed to identify mineral phases produced by water-related processes. RLS will help to identify organic compounds and search for microbial life by identifying the mineral products and indicators of biologic activities. RLS will provide geological and mineralogical context information that will be scientifically cross-correlated with that obtained by other instruments.

Rosalind Franklin (rover)

Rosalind Franklin, previously known as the ExoMars rover, is a planned robotic Mars rover, part of the international ExoMars programme led by the European Space Agency and the Russian Roscosmos State Corporation.Scheduled to launch in July 2020, the plan calls for a Russian launch vehicle, an ESA carrier module, and a Russian lander named Kazachok, that will deploy the rover to Mars' surface. Once safely landed, the solar powered rover will begin a seven-month (218-sol) mission to search for the existence of past life on Mars. The Trace Gas Orbiter (TGO), launched in 2016, will operate as Rosalind Franklin's and lander's data-relay satellite.The rover is named after English chemist and DNA pioneer, Rosalind Franklin.

Signs Of LIfe Detector

Signs Of LIfe Detector (SOLID) is an analytical instrument under development to detect extraterrestrial life in the form of organic biosignatures obtained from a core drill during planetary exploration.

The instrument is based on fluorescent immunoassays and it is being developed by the Spanish Astrobiology Center (CAB) in collaboration with the NASA Astrobiology Institute. SOLID is currently undergoing testing for use in astrobiology space missions that search for common biomolecules that may indicate the presence of extraterrestrial life, past or present. The system was validated in field tests and engineers are looking into ways to refine the method and miniaturize the instrument further.

WISDOM (radar)

WISDOM (Water Ice and Subsurface Deposit Observation on Mars) is a ground-penetrating radar that is part of the science payload on board the European Space Agency's Rosalind Franklin rover, tasked to search for biosignatures and biomarkers on Mars. The rover is planned to be launched in July 2020 and land on Mars in March 2021.


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