Chainsaw

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For other uses, see Chainsaw (disambiguation).



An arborist using a chainsaw to fell a eucalyptus tree

A chainsaw (or chain saw) is a portable mechanical, motorized saw. It is used in logging activities such as felling, limbing, and bucking; by tree surgeons to fell trees and remove branches and foliage; to fell snags and assist in cutting firebreaks in wildland fire suppression, and to harvest firewood. Chainsaws with specially designed bar and chain combinations have been developed as tools for use in chainsaw art.

Contents

1 Construction

2 Maintenance

3 Safety

4 History

5 Chainsaws for stone, concrete and brick

6 In popular culture

7 See also

8 References


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Construction



Chainsaw chain



A chainsaw clutch



Chainsaw blade in its channel.

A chainsaw consists of a several parts.

Engine almost always a two-stroke gasoline (petrol) internal combustion engine or electric motor.

Drive mechanism typically a clutch and sprocket.

Guide bar an elongated bar with a round end of wear-resistant alloy steel typically 16 to 36 inches 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 a small sharp blade, called a "tooth." This takes the form of a folded tab of chromium plate steel with a sharp corner and two cutting edges on the top plate and side plate. Left-handed and right-handed teeth are alternated in the chain. Chains come in varying pitch and gauge; the pitch of a chain is 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 fits into the guide bar (e.g., 0.05 inch). Conventional "full compliment" chain has one tooth per drive link. built into each tooth is a depth gauge or "raker" which rides ahead of the tooth and limits the depth of cut, typically to around 0.025". Depth gauges are critical to safe chain operation. If left too high they will cause very slow cutting, if filed too low they will make the saw dangerous and hard to control.

The underside of each link features a small metal finger called a "drive link" which locates the chain on the bar, helps to carry lubricating oil around the bar, and engages with the engine's drive sprocket inside the body of the saw. The engine drives the chain around the track by a centrifugal clutch, engaging the chain under power but allowing it to stop as the engine idles. The chain on the lower side of the cutter bar is normally used for cutting, "pulling" towards the operator, but cutting with a "pushing" chain can be done with appropriate training.

Dramatic improvements, chainsaw safety devices and overall design have taken place since the chainsaw's invention, saving many lives and preventing countless serious injuries. These include chainbrake systems, better chain design and anti-vibration systems.

As chainsaw carving has become more popular, chainsaw manufacturers 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. Echo sponsors a carving series,[1] as well as carvers such as former Runaways singer Cherie Currie.[2] RedMax specifically built the G3200 CV chainsaw for carving applications.[3]

Maintenance



Logging near Apiary, Oregon

Most chainsaws require two sources of lubrication. Like most two-stroke engines, the engine is lubricated by its fuel, which contains about 25% (depending on model) oil dissolved in the fuel. Separate chain oil or bar oil is used for the external lubrication of the bar and chain. The chain oil is depleted quickly because it tends to be thrown off the chain by centrifugal force, and it is soaked up by sawdust. The chain oil reservoir is usually topped up at the same time as refuelling, and the reservoir is large enough so that the saw runs out of fuel and stops before the chain oil runs dry. Failing to keep the chain oil topped up, or using an oil of incorrect viscosity, is a common source of damage to saws, and tends to lead to rapid wear of the bar, or the chain jamming or coming off the bar.

In addition to being quite thick, chain oil is particularly sticky (due to "tackifier" additives) to reduce the amount thrown off the chain. Although motor oil is a common emergency substitute, it is lost even faster and so leaves the chain underlubricated.

Chains must be kept sharp to perform well. They become blunt rapidly if they touch soil, metal or stones. When blunt, they tend to produce powdery sawdust, rather than the longer, clean shavings characteristic of a sharp chain; a sharp saw also needs very little force from the operator to push it into the...(and so on)
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