Chainsaw
A chainsaw (or chain saw) is a portable mechanical saw, typically powered by a two-stroke engine. It is used for cutting trees, to fell snags, to cut firebreaks in wild land fires, and to harvest firewood. Special chainsaws are used for cutting concrete.
Parts
A chainsaw has several parts, including:
Engine -- usually a two-stroke gasoline (petrol) internal combustion engine, usually with a cylinder volume of or electric motor.
Drive mechanism -- typically a clutch and sprocket.
Guide bar -- a long bar with a round end of wear-resistant alloy steel usually in length. An edge slot guides the cutting chain.
Cutting chain -- Usually each segment in this chain (which is constructed from riveted metal sections similar to a bicycle chain, but without rollers) features small sharp blades called teeth. The bottom of each link features a small metal finger called a" drive link" which locates the chain on the bar, helps to carry lubrication oil around the bar, and engages with the engine' s drive sprocket inside the body of the saw.
As chainsaw carving has become more popular, the makers of chainsaws are making special short, narrow-tipped bars for carving. These are called" quarter tipped," " nickel tipped" or" dime tipped" bars, based on the size of the round tip. After sometime the chainsaw chain gets dull.
References
Gardening tools