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02.04.2015, admin  
Category: Rustic Woodworking Projects

A drill is a tool fitted with a cutting tool attachment or driving tool attachment, usually a drill bit or driver bit, used for boring holes in various materials or fastening various materials together with the use of fasteners. Drills are commonly used in woodworking, metalworking, construction and do-it-yourself projects.
HistoryA wooden drill handle and other carpentry tools found on board the 16th century carrack Mary Rose.Around 35,000 BCE, Homo sapiens discovered the benefits of the application of rotary tools.
Drill presses are almost always equipped with more powerful motors compared to hand-held drills. 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. The hollow wooden handle, with screw-on cap, is used to store drill bitsPistol-grip (corded) drillAnatomy of a pistol-grip corded drill.Drills with pistol grips are the most common type in use today, and are available in a huge variety of subtypes.
The boy suffered from potentially fatal bleeding within the brain after a fall from his bicycle. The tip, and sometimes edges, of the cutting tool does the work of cutting into the target material.
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.
As the prices of power tools and suitable electric motors have fallen, however, such attachments have become much less common. The earliest evidence of these tools being used in Egypt dates back to around 2500 BCE.[5] The usage of bow-drills was widely spread through Europe, Africa, Asia and North America, during ancient times and is still used today.

It consists of a vertical spindle aligned by a piece of horizontal wood and a flywheel to maintain accuracy and momentum.[7]The hollow-borer tip, first used around the 13th century, consisted of a stick with a tubular shaped piece of metal on the end, such as copper. Virtually all examples have geared racks for adjusting the table and head position on the column.Geared head drill presses are commonly found in tool rooms and other commercial environments where a heavy duty machine capable of production drilling and quick setup changes is required.
Churn drills in ancient China were built of wood and labor-intensive, but were able to go through solid rock. Drills are available with a wide variety of performance characteristics, such as power and capacity. The motor used in corded drills is often a universal motor due to its high power to weight ratio.For much of the 20th century, many attachments could commonly be purchased to convert corded electric hand drills into a range of other power tools, such as orbital sanders and power saws, more cheaply than purchasing conventional, self-contained versions of those tools (the greatest saving being the lack of an additional electric motor for each device). Mainly used to create fire, bow-drills were also used in ancient woodwork, stonework and dentistry.
Archeologist discovered a Neolithic grave yard in Mehrgrath, Pakistan dating from the time of the Harappans, around 7,500-9,000 years ago, containing 9 adult bodies with a total of 11 teeth that had been drilled.[4] There are hieroglyphs depicting Egyptian carpenters and bead makers in a tomb at Thebes using bow-drills.
This pulsing (hammering) action is measured in Blows Per Minute (BPM) with 10,000 or more BPMs being common. In most cases, the spindle is machined to accept Morse taper tooling for greater flexibility.
A less common type is the right-angle drill, a special tool used by tradesmen such as plumbers and electricians. Gear head drills are intended for metalworking applications where the drilling forces are higher and the desired speed (RPM) is lower than that used for woodworking.Levers attached to one side of the head are used to select different gear ratios to change the spindle speed, usually in conjunction with a two- or three-speed motor (this varies with the material).
Larger geared head drill presses are frequently fitted with power feed on the quill mechanism, with an arrangement to disengage the feed when a certain drill depth has been achieved or in the event of excessive travel.

Some gear-head drill presses have the ability to perform tapping operations without the need for an external tapping attachment.
Drills with a percussive action (hammer drills) are mostly used in hard materials such as masonry (brick, concrete and stone) or rock. These heavy bits are adept at pulverising the masonry and drill into this hard material with relative ease.However, there is a big difference in cost.
As it is possible to swing the arm relative to the machine's base, a radial arm drill press is able to operate over a large area without having to reposition the workpiece.
Oil wells, water wells, or holes for geothermal heating are created with large drilling rigs.
Generally, standard chucks and drills are inadequate and chucks such as SDS and carbide drills that have been designed to withstand the percussive forces are used.
A vise may be used with a radial arm drill press, but more often the workpiece is secured directly to the table or base, or is held in a fixture. Some styles of this tool are intended for masonry drilling only and the hammer action cannot be disengaged. Other styles allow the drill to be used without the hammer action for normal drilling, or hammering to be used without rotation for chiselling.Cordless drillsCordless drillA cordless drill is an electric drill which uses rechargeable batteries. Instead of charging a tool for an hour to get 20 minutes of use, 20 minutes of charge can run the tool for an hour.

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