A diamond tool is a cutting tool which contains diamond segments for cutting through a wide variety of materials which other cutting tools cannot. The segments are composed of diamond crystals and powder metal which form the bond, or 'matrix', of the segments.

The bond is one of the prime factors when selecting which tool to use for cutting a specific material depending on how hard, or abrasive, the material is. The bond is what decides the rate at which the metallic powders wear down and expose new diamond crystals at the surface to maintain what would be considered a “sharp” edge.

Diamonds should not be used for cutting steel or iron, as carbon will dissolve into the workpiece and lead to tool wear and work hardening. Three other materials are used for cutting steels where diamond would be used: Cubic boron nitride (cBN, the second hardest material known), aluminum oxide, and silicon nitride tooling may be used.

For cutting hard materials, a diamond blade with a soft bond would be needed. This means the metallic powders in the segments (teeth) of the diamond blade wear fast enough to release old, dull crystals, exposing new diamond at the edges to continue cutting efficiently. Inversely, to cut a soft abrasive material like asphalt or freshly poured concrete, you would need to use a diamond blade with a hard bond so that the segments do not wear down prematurely and the blade is not put to waste. Diamond is especially suited to cut highly abrasive materials, such as ceramics.

The diamonds used in these tools are synthetic or natural industrial diamond of different grain sizes and shapes.

A power tool is a tool powered by an electric motor, a compressed air motor, or a gasoline engine. Power tools are classified as either stationary or portable, where portable means handheld. They are used in industry, in construction, and around the house for cutting, shaping, drilling, sanding, painting, grinding, and polishing. Stationary power tools for metalworking are usually called machine tools. The term machine tool is not usually applied to stationary power tools for woodworking, although such usage is occasionally heard, and in some cases, such as drill presses and bench grinders, the exact same tool is used for both woodworking and metalworking.

The lathe is the oldest power tool, being known to the ancient Egyptians (albeit in a hand-powered form). Early industrial revolution-era factories had batteries of power tools driven by belts from overhead shafts. The prime power source was a water wheel or (later) a steam engine. The introduction of the electric motor (and electric distribution networks) in the 1880s made possible the self-powered stationary and portable tools we know today.

Stationary power tools are prized not only for their speed, but for their accuracy. A table saw not only cuts faster than a hand saw, but the cuts are smoother, straighter and more square than even the most skilled man can do with a hand saw. Lathes produce truly round objects that cannot be made in any other way.

An electric motor is the universal choice to power stationary tools. Portable electric tools may be either corded or battery-powered. At present (2007) the limitations of battery life, energy capacity, and cost keep the corded versions on the market. Compressed air is the customary power source for nailers and paint sprayers. A few tools (called powder-actuated tools) are powered by explosive cartridges. Gasoline-powered tools such as chain saws and weed whackers are made for outdoor use.

Common power tools include the drill, various types of saws, the router, the electric sander, and the lathe.

The term power tool is also used in a more general sense, meaning a technique for greatly simplifying a complex or difficult task.

Diamond dressers, Which is, single point or multipoint brazed to a steel shank and are used for truing and dressing of grinding wheels, mostly in automobile industry. After enormous research, the shape and sizes were invented like Grit impregnated, Blade type, Crown type, disc type etc. The advantages of multi point over single point are,

1. The whole diamond can be used unlike single point when the point is blunt you have to reset and after few resetting the diamond is wasted.
2. More accuracy specially in form grinding, blade types are used. Blades consists of elongated diamonds and the thickness is controlled and are available from 0.75 mm to 1.40 mm.
3. Grit type tools are of tough grade and can even use for bench grinders.
4. Since small points are used, these diamonds are of cutting edge with natural points unlike single points are brutted points.
5. Cost will also be very low since small diamonds are used. Diamond value varies more according to size.

Many diamond tools don’t cut like a knife or saw blade, instead they grind. They usually have segments, or teeth, welded to the “cutting” edge of the tool which contain exposed diamond crystals for grinding.

For example, with a diamond blade, the saw operator will push the blade through the material. The blade will begin to cut through the material and the material being cut will begin the wearing process of the diamond blade, at the rate of which the blade advances or the depth at which is being cut. The exposed diamonds will break into smaller pieces when cutting. Hard, dense materials will fracture the diamonds faster. As this happens, the material being cut also wears down the metal bond through abrasion. Highly abrasive materials will wear the bond faster, exposing new diamond crystals to continue cutting.