For most drill presses—especially those meant for woodworking or home use—speed change is achieved by manually moving a belt across a stepped pulley arrangement. Some drill presses add a third stepped pulley to increase the number of available speeds. Modern drill presses can, however, use a variable-speed motor in conjunction with the stepped-pulley system. Medium-duty drill presses such as those used in machine shop (tool room) applications are equipped with a continuously variable transmission. This mechanism is based on variable-diameter pulleys driving a wide, heavy-duty belt. This gives a wide speed range as well as the ability to change speed while the machine is running. Heavy-duty drill presses used for metalworking are usually of the gear-head type described below.
A drill press (also known as a pedestal drill, pillar drill, or bench drill) is a style of drill that may be mounted on a stand or bolted to the floor or workbench. Portable models are made, some including a magnetic base. Major components include a base, column (or pillar), adjustable table, spindle, chuck, and drill head, usually driven by an electric motor. The head typically has a set of three handles radiating from a central hub that are turned to move the spindle and chuck vertically. A drill press is typically measured by its "swing", calculated as twice the distance from the center of the chuck to the closest edge of the column. Thus, a tool with 4" between chuck center and column edge is described as an 8" drill press.
Drill presses are often used for miscellaneous workshop tasks other than drilling holes. This includes sanding, honing, and polishing. These tasks can be performed by mounting sanding drums, honing wheels and various other rotating accessories in the chuck. This can be unsafe in some cases, as the chuck arbor, which may be retained in the spindle solely by the friction of a taper fit, may dislodge during operation if the side loads are too high.
UK drill has developed a different production style than Chicago, taking influence from earlier British genres such as grime and UK garage, so much so that it has been called "the New Grime" and drill producer Carns Hill has commented that it needs a new name. However, Mazza, a UK drill producer, disagreed with the "new grime" label, maintaining that although drill and grime share the same energy, rawness, and originated in a similar fashion, the two genres are distinct in their own ways. Both genres typically utilize a tempo of approximately 140 bpm. Artists around the world, such as in Spain, Australia, and The Netherlands, have since been influenced by UK drill's production style.
The oldest evidence of a hole being applied on a human's brain with a drill dates from c. 4,000 B.C. The oldest cranial drilling instrument was found in France, and subsequent use evidenced by the Ancient Romans, Egyptians, and in Trepanation in Mesoamerica. The practice of trepanning is also evidenced from Ancient Greece, North and South America, Africa, Polynesia and the Far East. The conceivable reasons why ancient humans developed the technique of drilling the head could be religious, ritual or medical factors. The first trepanning procedure consisted of different types or tools and techniques: at the beginning the only material that was available for use was a sharp and carved rock. The development of The Hippocratic Corpus, written in the fifth century B.C., is the first written source that can be found about trepanning. The aim of the procedure described in "on Wounds in the head" was to allow the stagnant blood to escape from the head through a hole. The drill that was used at the time is similar to the modern ones, but was operated by hand rotation.
The two Non-Governmental Organisations GeoHazards Society (GHS) and GeoHazards International (GHI) has been working for earthquake safety in South Asia for many years. In the year 2009 both the organisations along with Library of Tibetan Works and Archives together decided to mark the most destructive Kangra earthquake at Dharamshala in India. Considering the vulnerability of the school children in one of the most earthquake prone region of the world a School Safety Preparedness Drill was organised in the Tibetan schools along the Himalayas in India at 11:00 morning. About 7,500 children participated in the first ever such kind of a drill in India on 4 April 2009 in 25 Tibetan schools.
UK drill groups often engage in disputes with each other, sometimes violent, often releasing multiple diss tracks. Notable disputes include Zone 2 versus Moscow 17, 150 versus 67 OFB/NPK versus WG/N9 and SMG versus 814 (a member of 814, Showkey, was stabbed to death in 2016 in an unrelated incident ).
Drill pipe makes up the majority of the drill string back up to the surface. Each drill pipe comprises a long tubular section with a specified outside diameter (e.g. 3 1/2 inch, 4 inch, 5 inch, 5 1/2 inch, 5 7/8 inch, 6 5/8 inch). At each end of the drill pipe tubular, larger-diameter portions called the tool joints are located. One end of the drill pipe has a male ("pin") connection whilst the other has a female ("box") connection. The tool joint connections are threaded which allows for the mating of each drill pipe segment to the next segment.
Improvements in technology are replacing the basic hand cranial drill by an robotic drill. The robotic drill is a high pace drill that will allow surgeons to experience performance over 50 times faster. The robotic drill is still not used in the point of time.
An earthquake drill is a drill used to practice in preparation for an earthquake. Schools in some areas conduct earthquake drills. Stop, drop and hold on is used during the drill. School Safety Preparedness Drill (SSPD) is an annual earthquake preparedness drill being organised in schools of North and North Eastern states of India commemorating 4 April 1905 Kangra earthquake.
During the SSPD the schools prepare for an earthquake scenario and when the shaking starts the children along with staff perform a Drop Cover Hold on under sturdy tables and desks preparing to save themselves from falling objects. When the shaking stops everybody evacuates to a pre-designated assembly area followed by a debriefing. With every passing year the drill started expanding to new areas covering more children both at Tibetan and non-Tibetan schools. In the 5th SSPD in 2013 more than 50,000 children participated in 162 schools in North and North East Indian states. Moreover, one school from Bhutan and another from Mandalay in Myanmar also participated in that drill. with participation of more than 725,000 children in 1100 schools.
UK drill is a subgenre of drill music and road rap that originated in the South London district of Brixton from 2012 onwards. Borrowing heavily from the style of Chicago drill music, UK drill artists often rap about violent and hedonistic criminal lifestyles. Typically, those that create this style of music are affiliated with gangs or come from socioeconomically-deprived neighborhoods where crime is a way of life for many. UK drill music is heavily related to road rap, a British style of gangsta rap that became popular in the years prior to the existence of drill. Musically, UK drill often exhibits violent language, variety of lyrical delivery, and the fierce rivalries that came with it. Notable pioneers include the crews 150, 67 (both based in or around Brixton) and 86. Since 2016, more modern groups have emerged such as 814, Silwood Nation, Block 6, Y.ACG, Zone 2, BSide, Moscow17, CGM (Formerly 1011), 12World, SMG, OFB, NPK and the Harlem Spartans. UK drill groups relied on internet platforms to distribute their music, particularly on YouTube, where platforms such as Link up TV, GRM Daily, SB.TV, Mixtape Madness, PacMan TV and Pressplay Media have helped various groups amass thousands, sometimes millions, of views.
UK drill received worldwide attention outside the UK in 2017 when comedian Michael Dapaah released the novelty song "Man's Not Hot". The track samples a beat made by UK drill producers GottiOnEm and Mazza; it was first used by drill group 86 on its song "Lurk", and later 67 with "Let's Lurk" featuring Giggs.
Three cones are placed five yards apart from each other forming a right angle. The athlete starts with one hand down on the ground and runs to the middle cone and touches it. The athlete then reverses direction back to the starting cone and touches it. The athlete reverses direction again but this time runs around the outside of the middle cone on the way to the far cone running around it in figure eight fashion on his way back around the outside of the middle cornering cone. Athletes are timed for this whole procedure. This drill is primarily used to determine a player's agility.
In many military services, a Drill Instructors' creed has been created to succinctly state the beliefs that a Drill Instructor should follow.
New Guard America was founded in 1997 by Constantine H. Wilson. This is the world's only internationally touring civilian drill team. They use Springfield M1903 rifles with fixed 10 in bayonets. They are based out of the Washington, DC metropolitan area. They perform mainly in four man-blocks. In June 2008 they performed at the Norwegian Military Tattoo in Oslo, Norway, making them the first civilian drill team to perform at an international tattoo.
Manufacturers can produce special versions of the twist drill bit, varying the geometry and the materials used, to suit particular machinery and particular materials to be cut. Twist drill bits are available in the widest choice of tooling materials. However, even for industrial users, most holes are drilled with standard high speed steel bits.
The term core drill bit is used for two quite different tools.
The top American bladed (bayonet-only) independent drill meet was Pro America and the top American independent armed drill meet is the Isis World Drill Championships for post high school professional exhibition drillers in the nation. The same concept is also applied to various police departments and agencies. Junior Reserve Officers' Training Corps (JROTC) programs may also compete in the National High School Drill Team Championships held in Daytona Beach, Florida. There are two divisions for competing, Unarmed, and Armed. During the summers, most drill teams go to drill camps to hone their skills. Also see high school "military" drill teams in high school. Washington, Idaho, California.
The rotating crank is typically connected to several cogs that sets pressure on the skull. This specific drill is not connected to any external power, and is used very little in today's operations. The manual cranial drill is the most used and predominant type of drill in surgery, and performs manually. Which, has an adjusted stopper based on the setting and where the bone is the most thickest to prevent plunging. Surgeons use this drill manually without any other procedures. Surgeons that use a hand-cranked drill often are required to employ a lot of upper body strength.