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).

Chisel
A chisel is a tool with a characteristically shaped cutting edge (such that wood chisels have lent part of their name to a particular grind) of blade on its end, for carving and/or cutting a hard material such as wood, stone, or metal. The handle and blade of some types of chisel are made of metal or wood with a sharp edge in it.

In use, the chisel is forced into the material to cut the material. The driving force may be manually applied or applied using a mallet or hammer . In industrial use, a or falling weight hydraulic ram ('trip hammer') drives the chisel into the material to be cut.

A gouge, one type of chisel, is used, particularly in woodworking, woodturning and sculpture, to carve small pieces from the material. Gouges are most often used in creating concave surfaces. A gouge typically has a 'U'-shaped cross-section.

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 vary widely in their shape and structure. 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 mechandise of firearms.

Saw

A saw is a tool for cutting wood or other material, consisting of aserrated blade(a blade with the cutting edge dentated or toothed) and worked either by hand or by steam,water,electric or other power. The teeth of the saw are each bent to specific angle and this angle is called "set". The set of a tooth is dependent on the kind of cut the saw will be making. For example a "rip saw" has a tooth set that is similar to the angle used on a chisel. The idea is to have the teeth rip or tear the material apart.

Some saws, such as the abrasive saw, use an abrasive disc or band for cutting, rather than a serrated blade.

The saw can also be used, more uncommonly,for playing music.

According to Chinese tradition, the saw was invented by Lu Ban. In Greek mythology, Perdix, the nephew of Daedalos, invented the saw. In reality, metal saws likely evolved from Neolithic stone tools.

Pliers
Pliers are hand tools, designed primarily for gripping objects by using leverage. Pliers are designed for numerous purposes and require different jaw configurations to grip, turn, pull, or crimp a variety of things. They are a tool common to many dexterous trades and occupations. Many types of pliers also include jaws for cutting.

In American English, wrench is the standard term, while spanner refers to a specialized wrench with a series of pins or tabs around the circumference. (These pins or tabs fit into the holes or notches cut into the object to be turned.) The most common shapes are called open-end wrench and box-end wrench.

In British English, spanner is the standard term. The most common shapes are called open-ended spanner and ring spanner.

Wrenches are typically made from a chromium-vanadium steel alloy.
Hinged tools, such as pliers or tongs, are not generally considered wrenches.

Labels: Wan Yi ... pokey