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![]() Dead-blow hammer | |
Other names | Dead-blow mallet |
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Classification | Hammer |
Related | Rubber mallet |
A dead-blow hammer is a specialized mallet helpful in minimizing damage to the struck surface and in controlling striking force, with minimal rebound from the struck surface. The minimal rebound is helpful in avoiding accidental damage to precision work, especially in tight locations and in applications such as maintenance work on hydraulic cylinders.
The head of the dead-blow hammer can be solid or hollow (often partially filled with loose steel shot), which distributes the energy of the strike over a longer period of time and reduces rebound. [1]
Solid-head dead-blow hammers are usually made of rubber or resilient plastic (such as polyurethane or ultra high molecular weight polyethylene UHMW) and rely on the inherent properties of the material to absorb shock and reduce rebound. Composite heads and fiberglass handle models are also available, with optional shock-absorbent rubber grips. A variant design omits the handle entirely; the dead-blow head is gripped directly in the hand, for use in tight locations.
Some dead-blow hammers have replaceable striking faces, attached by screwing or pressing them into place on the main body of the hammer. These replaceable faces (or “inserts”) not only can extend the life of the tool, they can be hardness matched to the surface being struck, minimizing damage while allowing optimal energy transfer on impact.
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In a conventional solid-head hammer, the force of the entire solid mass of the head is delivered at the moment of impact. Compared to a conventional hammer of similar weight, a dead-blow hammer conveys less peak force, spread over a longer time.
At the moment the face of the hammer head contacts the surface being struck, the sand or shot within the head is effectively trailing it (due to inertia, it is collected at the opposite end of the head). The force imparted by this additional loose mass within the head is not imparted to the struck surface at the moment of contact. Instead, this force is spread out over some period of time, as the sand or shot descends to fill the "face" end of the head. Such a blow is less "sharp" than that of the conventional hammer and feels more "dead" (less elastic rebound) to the user, hence the name.
Dead-blow hammers are commonly used in automotive repair for body work, dislodging stuck parts, hubcap installation, and installing and removing knock-off hubs. They also allow controlled use of impact force when performing engine or transmission repair.
In maintenance of hydraulic machinery and aerospace work, dead-blow hammers are useful in freeing stuck cylinders without damaging their precision-formed surfaces or any nearby bearings.
Dead-blow hammers are used in woodworking to knock joints together or apart without denting wood components. [2]
In metalworking, a dead-blow hammer can be used to properly seat the workpiece against parallels in a machine vise. [3] [4]
Dead-blow hammers are sometimes used in orthopedic surgical procedures.[ citation needed ] The tools are also used in telecommunications to shape large diameter cables within cable runs. [5]
Deadblow mallets are also used in the installation of commercial and residential slab marble and granite applications, and concrete pavers.[ citation needed ]
A hammer is a tool, most often a hand tool, consisting of a weighted "head" fixed to a long handle that is swung to deliver an impact to a small area of an object. This can be, for example, to drive nails into wood, to shape metal, or to crush rock. Hammers are used for a wide range of driving, shaping, breaking and non-destructive striking applications. Traditional disciplines include carpentry, blacksmithing, warfare, and percussive musicianship.
Forging is a manufacturing process involving the shaping of metal using localized compressive forces. The blows are delivered with a hammer or a die. Forging is often classified according to the temperature at which it is performed: cold forging, warm forging, or hot forging. For the latter two, the metal is heated, usually in a forge. Forged parts can range in weight from less than a kilogram to hundreds of metric tons. Forging has been done by smiths for millennia; the traditional products were kitchenware, hardware, hand tools, edged weapons, cymbals, and jewellery.
A grommet is a ring or edge strip inserted into a hole through thin material, typically a sheet of textile fabric, sheet metal or composite of carbon fiber, wood or honeycomb. Grommets are generally flared or collared on each side to keep them in place, and are often made of metal, plastic, or rubber. They may be used to prevent tearing or abrasion of the pierced material or protection from abrasion of the insulation on the wire, cable, line being routed through the penetration, and to cover sharp edges of the piercing, or all of the above.
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A claw hammer is a hammer primarily used in carpentry for driving nails into or pulling them from wood. Historically, a claw hammer has been associated with woodworking, but is also used in general applications. It is not suitable for heavy hammering on metal surfaces, as the steel of its head is somewhat brittle; the ball-peen hammer is more suitable for such metalwork.
A chuck is a specialized type of clamp used to hold an object with radial symmetry, especially a cylinder. In a drill, a mill and a transmission, a chuck holds the rotating tool; in a lathe, it holds the rotating workpiece.
In mechanics, an impact is when two bodies collide. During this collision, both bodies decelerate. The deceleration causes a high force or shock, applied over a short time period. A high force, over a short duration, usually causes more damage to both bodies than a lower force applied over a proportionally longer duration.
Wood shingles are thin, tapered pieces of wood primarily used to cover roofs and walls of buildings to protect them from the weather. Historically shingles, also known as shakes, were split from straight grained, knot free bolts of wood. Today shingles are mostly made by being cut which distinguishes them from shakes, which are made by being split out of a bolt.
Pneumatic cylinder, also known as air cylinder, is a mechanical device which uses the power of compressed gas to produce a force in a reciprocating linear motion.
A pile driver is a heavy-duty tool used to drive piles into soil to build piers, bridges, cofferdams, and other "pole" supported structures, and patterns of pilings as part of permanent deep foundations for buildings or other structures. Pilings may be made of wood, solid steel, or tubular steel, and may be driven entirely underwater/underground, or remain partially aboveground as elements of a finished structure.
An impact wrench is a socket wrench power tool designed to deliver high torque output with minimal exertion by the user, by storing energy in a rotating mass, then delivering it suddenly to the output shaft. It was invented by Robert H. Pott of Evansville, Indiana.
Cue sports techniques are a vital important aspect of game play in the various cue sports such as carom billiards, pool, snooker and other games. Such techniques are used on each shot in an attempt to achieve an immediate aim such as scoring or playing a safety, while at the same time exercising control over the positioning of the cue ball and often the object balls for the next shot or inning.
The earthquake bomb, or seismic bomb, was a concept that was invented by the British aeronautical engineer Barnes Wallis early in World War II and subsequently developed and used during the war against strategic targets in Europe. A seismic bomb differs somewhat in concept from a traditional bomb, which usually explodes at or near the surface and destroys its target directly by explosive force; in contrast, a seismic bomb is dropped from high altitude to attain very high speed as it falls and upon impact, penetrates and explodes deep underground, causing massive caverns or craters known as camouflets, as well as intense shockwaves. In this way, the seismic bomb can affect targets that are too massive to be affected by a conventional bomb, as well as damage or destroy difficult targets such as bridges and viaducts.
A punch is a tool used to indent or create a hole through a hard surface. They usually consist of a hard metal rod with a narrow tip at one end and a broad flat "butt" at the other. When used, the narrower end is pointed against a target surface and the broad end is struck with a hammer or mallet, causing the blunt force of the blow to be transmitted through the rod body and focused more sharply onto a small area. Typically, woodworkers use a ball-peen hammer to strike a punch.
A high striker, also known as a strength tester, or strongman game, is an attraction used in funfairs, amusement parks, fundraisers, and carnivals. It operates by utilizing the lever where one end holds a puck attached to the tower and the other end is struck by the person or contestant using a hammer or mallet. The aim of players is to ring the bell suspended on top of the tower. If the lever is struck with enough force, the puck will rise high enough to hit the bell, indicating a success. Modern versions use a spring-loaded version of the lever, while others use an enclosed striking mechanism.
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A soft-faced hammer or mallet is a hammer designed to offer driving force without damaging surfaces. They also reduce the force transmitted back to the arm or hand of the user, by temporarily deforming more than a metal hammer would.