hammer drill!

hammer drill

Comprehensive Analysis

1) "Hammer" -- As to hammer drill 1ham·mer Pronunciation: 'ha-m&r Function: noun Etymology: Middle English hamer, from Old English hamor; akin to Old High German hamar hammer, and perhaps to Old Church Slavic kamen-, kamy stone, Greek akmE point, edge -- more at EDGE 1 a : a hand tool consisting of a solid head set crosswise on a handle and used for pounding b : a power tool that often substitutes a metal block or a drill for the hammerhead 2 : something that resembles a hammer in form or action: as a : a lever with a striking head for ringing a bell or striking a gong b (1) : an arm that strikes the cap in a percussion lock to ignite the propelling charge (2) : a part of the action of a modern gun that strikes the primer of the cartridge in firing or that strikes the firing pin to ignite the cartridge c : MALLEUS d : GAVEL e (1) : a padded mallet in a piano action for striking a string (2) : a hand mallet for playing on various percussion instruments (as a xylophone) 3 : a metal sphere thrown for distance in the hammer throw 4 : ACCELERATOR b - under the hammer : for sale at auction Pronunciation Symbols A claw hammer A hammer is a tool meant to deliver blows to an object. The most common uses are for driving nails, fitting parts, and breaking up objects. Hammers are often designed for a specific purpose, and so their design varies quite a lot. Usual features are a handle and a head, with most of the weight in the head. The basic design is hand-operated, but there are also many mechanically operated models for heavier uses. The hammer is a basic tool of many professions, and can also be used as a weapon. Either way, it is perhaps the oldest human tool, perhaps even older than the earliest Homo species. By analogy, the name hammer has also been used for many mechanical parts and devices that are designed to deliver blows, e.g. in the caplock mechanism of firearms. 1 Basic design and variations 2 Applications and technique 2.1 Avoiding bent nails 3 The physics of hammering 3.1 Hammer as a force amplifier 3.2 Effect of the head's mass 3.3 Effect of the handle 4 War hammers 5 Symbolic hammers 6 Hammers in popular culture The essential part of a hammer is the head, a compact solid mass that is able to deliver the blows to the intended target without itself breaking up. The opposite side of the head may have a second striking surface; or a claw or wedge to pull nails, or may be shaped like a ball as in the ball-peen hammer and the cow hammer. Some upholstery hammers have a magnetized appendage, to pick up tacks. Popular hand-powered variations include- carpenter's hammers (used for nailing), su..." 2) "Drill" -- As to hammer drill 1drill Pronunciation: 'dril Function: verb Etymology: Dutch drillen transitive verb 1 a : to fix something in the mind or habit pattern of by repetitive instruction <drill pupils in spelling> b : to impart or communicate by repetition <impossible to drill the simplest idea into some people> c : to train or exercise in military drill 2 a (1) : to bore or drive a hole in (2) : to make by piercing action <drill a hole> b : to shoot with or as if with a gun c (1) : to propel (as a ball) with force or accuracy <drilled a single to right field> (2) : to hit with force <drilled the batter with the first pitch> intransitive verb 1 : to make a hole with a drill 2 : to engage in an exercise - drill·abil·i·ty /"dri-l&-'bi-l&-tE/ noun - drill·able /-l&-b&l/ adjective - drill·er /'dri-l&r/ noun Pronunciation Symbols A child using an electric drill with a screwdriver bit mounted in the chuck. A drill is a tool with a rotating drill bit used for drilling holes in various materials. Drills are commonly used in woodworking and metalworking. The drill bit is gripped by a chuck at one end of the drill, and is pressed against the target material and rotated. The tip of the drill bit does the work of cutting into the target material, slicing off thin shavings (twist drills or auger bits) or grinding off small particles (oil drilling). 1 History 2 Types 2.1 Hand tools 2.2 Electric Drill 2.3 Hammer Drill 2.4 Rotary hammer drill 2.5 Cordless drills 2.6 Drill press 2.7 Geared head drill 2.8 Radial arm drill 2.9 Mill drill 3 Related tools 4 See also 5 References The earliest drills were probably bow drills. The invention of the electrical drill is credited to Arthur James Arnot[1], in 1889, at Melbourne, Australia. Wilhelm Fein[2] invented the portable electric drill in 1895, at Stuttgart, Germany. In 1917, Black & Decker patented a trigger-like switch mounted on a pistol-grip handle.[3] There are many types of drills; some powered by hand and others using electricity or compressed air as the motive power. Drills with a percussive action (such as hammer drills, jackhammers or pneumatic drills) are usually used in hard materials su..." 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