11) Hammer

HAMMER

A hammer is a tool or device that delivers a blow (a sudden impact) to an object. Most hammers are hand tools used to drive nails, fit parts, forge metal, and break apart objects. Hammers vary in shape, size, and structure, depending on their purposes.

Hammers are basic tools in many trades. The usual features are a head (most often made of steel) and a handle (also called a helveor haft). Although most hammers are hand tools, powered versions exist; they are known as powered hammers. Types of power hammer include steam hammers and trip hammers, often for heavier uses, such as forging.

A traditional hand-held hammer consists of a separate head and a handle, fastened together by means of a special wedge made for the purpose, or by glue, or both. This two-piece design is often used, to combine a dense metallic striking head with a non-metallic mechanical-shock-absorbing handle (to reduce user fatigue from repeated strikes). If wood is used for the handle, it is often hickory or ash, which are tough and long-lasting materials that can dissipate shock waves from the hammer head. Rigid fiberglass resin may be used for the handle; this material does not absorb water or decay, but does not dissipate shock as well as wood.

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A loose hammer head is hazardous because it can literally "fly off the handle" when in use, becoming a dangerous uncontrolled missile. Wooden handles can often be replaced when worn or damaged; specialized kits are available covering a range of handle sizes and designs, plus special wedges for attachment.

Some hammers are one-piece designs made primarily of a single material. A one-piece metallic hammer may optionally have its handle coated or wrapped in a resilient material such as rubber, for improved grip and reduced user fatigue.The hammer head may be surfaced with a variety of materials, including brass, bronze, wood, plastic, rubber, or leather. Some hammers have interchangeable striking surfaces, which can be selected as needed or replaced when worn out.

HAMMER FACTS :

1. Hammers have been used since the Stone Ages, and were made of rock, used for carving and breaking items including stone, wood and bone.
2. Hammers most often require a human force to become useful, although mechanical and electrical versions are available.
3. The head of hammers are generally made of metal, often steel, due to having a suitable mass, although they can be wooden, and these have a softer impact which helps to prevent damage to the item being hit.
4. The claw of a hammer is commonly used to grasp unwanted nails and remove them from the driven object, and there is increased power due to the leverage occurring.
5. Titanium hammer heads have been proven to absorb most recoil from the force of the impact, with recoil being up to ten times greater in typical steel heads.

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Source : Wiki and hammer facts