Chainsaw

A chainsaw (also spelled chain saw) is a portable mechanical, motorized saw. It is most commonly used in forestry and by tree surgeons, to fell trees and to remove branches and foliage, and to harvest firewood.

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Chainsaws consist of a small two-stroke gasoline (petrol) internal combustion engine (although smaller versions sometimes use electric motors), the "blade" or "bar" (essentially a long metal frame of a very hard wearing alloy) and the cutting chain itself. Usually each segment in this chain (which is constructed from riveted metal sections similar to a bicycle chain, but without rollers) features a small sharp blade, called a "tooth". "Skip tooth" chain has a tooth only on every second link, and is used for reduced risk of the chain clogging when cutting very soft wood. In modern saws the teeth are not straight blades; they have a forward section which first chips a piece of wood from the bottom of the cut, then another section, at a right angle to the first, which chips a piece from the wall of the cut. There are left and right handed teeth, depending on which wall of the cut they will chip. Left and right teeth are alternated in the chain. The underside of each link features a small metal finger which keeps the tooth centered between the rails of the bar, helps to pump lubricating oil around the blade, and engages with the motor's drive sprocket inside the body of the saw. The motor drives the chain around the track at a high speed, providing an effective (if rather rough) cutting action.

Saw: :The article is about the cutting tool. For other meanings of saw, see Saw (disambiguation)....

Forestry: Forestry is the art, science, and practice of studying and managing forests and plantations, and related natural resources. Silviculture, a related science, involves the growing and tending of trees and forests. Modern forestry generally concerns itself with assisting forests to provide timber as ra...

Tree surgeon: REDIRECT Arborist...

Chainsaw related Images and Photos (experimental)

Handy Manny Ripp the Chain Saw Toy	Pocket Chainsaw	Texas Chainsaw Massacre, The (DVD)	Texas Chainsaw Massacre (BD)
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The Texas Chainsaw Massacre	The Texas Chainsaw Massacre	Texas Chainsaw Massacre Film Collection (DBFE) (DVD) (WS) (Franchise Art)	Texas Chainsaw Massacre, The: Collector's Edition (Dbl DVD)