Chainsaws
A chainsaw (r chain saw) is nothing but a portable mechanical, motorized saw. It is mainly used in activities such as felling, limbing, and bucking, to fell trees and help remove branches and foliage. It is also to fell snags and assist in cutting firebreaks in wild land fire suppression, and also helps to harvest firewood. There are Chainsaws that are specially designed with bar and chain and used as tools in chainsaw art..
A chainsaw consists of the following parts.
An Engine that is almost always a two stroke gasoline (petrol) internal combustion engine or it would an electric motor.
A Drive mechanism that consists of typically a clutch and a sprocket.
A Guide bar – this is an elongated bar that comes with a round end of wear-resistant alloy steel that is typically 16 to 36 inches in length. There is an edge slot that guides the cutting chain.
A Cutting chain: Each segment in this chain is constructed from riveted metal sections that is similar to a bi cycle chain, but comes without rollers which feature a small sharp blade, called as a "tooth." This would take the form of a folded tab of chromium plate steel that comes with a sharp corner and two cutting edges on the top plate and the side plates. You can see that left-handed and right-handed teeth appear alternatively in the chain. Chains appear in varying pitch and gauge. The pitch of a chain is usually defined as half of the length spanned by any three consecutive rivets (e.g., 0.325 inch), while the gauge is the thickness of drive link where it exactly fits into the guide bar (e.g., 0.05 inch). You will find that conventional "full complement" chain usually has one tooth per drive link. Also built into each of the tooth is a depth gauge or a "raker" which rides ahead of the tooth and helps to limit the depth of cut, typically to somewhere around 0.025". Depth gauges are critical to help safe chain operation. If it is left too high then they will cause very slow cutting, and if filed too low they would make the saw too dangerous and hard to control the same.
You can see that the underside of each link features a small metal finger that is called a "drive link" which helps to locate the chain on the bar. It helps to carry lubricating oil around the bar, and which engages with the engine's drive sprocket inside the body of the saw. The engine will drive the chain around the track by means of a centrifugal clutch, which engages the chain under power and allowing it to stop when the engine is idle.