» 
Arabic Bulgarian Chinese Croatian Czech Danish Dutch English Estonian Finnish French German Greek Hebrew Hindi Hungarian Icelandic Indonesian Italian Japanese Korean Latvian Lithuanian Malagasy Norwegian Persian Polish Portuguese Romanian Russian Serbian Slovak Slovenian Spanish Swedish Thai Turkish Vietnamese
Arabic Bulgarian Chinese Croatian Czech Danish Dutch English Estonian Finnish French German Greek Hebrew Hindi Hungarian Icelandic Indonesian Italian Japanese Korean Latvian Lithuanian Malagasy Norwegian Persian Polish Portuguese Romanian Russian Serbian Slovak Slovenian Spanish Swedish Thai Turkish Vietnamese

definitions - Chainsaw

chainsaw (n.)

1.portable power saw; teeth linked to form an endless chain

   Advertizing ▼

definition (more)

definition of Wikipedia

synonyms - Chainsaw

chainsaw (n.)

chain saw

   Advertizing ▼

phrases

-Chainsaw (disambiguation) • Chainsaw (log file viewer) • Chainsaw (punk zine) • Chainsaw (rock band) • Chainsaw (song) • Chainsaw Cassettes • Chainsaw Charlie • Chainsaw Charlie (Murders in the New Morgue) • Chainsaw Dismemberment • Chainsaw Kittens • Chainsaw Kittens (album) • Chainsaw Monday • Chainsaw Records • Chainsaw Scumfuck • Chainsaw Vigilante • Chainsaw Warrior • Chainsaw carving • Chainsaw safety clothing • Chainsaw safety features • Daisy Chainsaw • Dave, Shelly, and Chainsaw • Hollywood Chainsaw Hookers • List of characters of The Texas Chainsaw Massacre • Texas Chainsaw Horns • The Texas Chainsaw Massacre • The Texas Chainsaw Massacre (comics) • The Texas Chainsaw Massacre (film) • The Texas Chainsaw Massacre (franchise) • The Texas Chainsaw Massacre 2 • Ubugoe Chainsaw

analogical dictionary

Wikipedia

Chainsaw

                   
  A Stihl chainsaw

A chainsaw (or chain saw) is a portable mechanical saw, powered by electricity, compressed air, hydraulic power, or most commonly a two-stroke engine.[1] It is used in activities such as tree felling, limbing, bucking, pruning, 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. Specialist chainsaws are used for cutting concrete.

Contents

  Construction

  Chainsaw cutting chain

Media related to Chainsaw parts at Wikimedia Commons A chainsaw consists of several parts.

  • Engine — almost always a two-stroke gasoline (petrol) internal combustion engine, usually with a cylinder volume of 30-120 cm3 or an electric motor.
  • Drive mechanism — typically a centrifugal 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. Specialized loop-style bars, called bow bars, were also used at one time for bucking logs and clearing brush, although they are now rarely encountered due to increased hazards of operation.
  • 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 cutting teeth. Each tooth takes the form of a folded tab of chromium plated steel with a sharp angular or curved corner and two cutting edges, one on the top plate and one on the 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 complement" chain has one tooth for every two drive links. "Full skip" chain has one tooth for every three drive links. 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 the chain will become more prone to kick back. Low depth gauges will also cause the saw to vibrate excessively. Vibration is not only uncomfotable for the operator but is also detrimental to the saw.

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.

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,[2] as well as carvers such as former Runaways singer Cherie Currie.[3] RedMax specifically built the G3200 CV chainsaw for carving applications.[4]

  Maintenance

Two-stroke chainsaws require about 2–5% of oil in the fuel to lubricate the motor, while the motor in electrical chain-saws is normally lubricated for life.

Separate chain oil or bar oil is used for the lubrication of the bar and chain on all types of chain-saw. The chain oil is depleted quickly because it tends to be thrown off by chain centrifugal force, and it is soaked up by sawdust. On two-stroke chainsaws the chain oil reservoir is usually filled up at the same time as refueling. The reservoir is normally large enough to provide sufficient chain oil between refueling. Lack of chain-oil, or using an oil of incorrect viscosity, is a common source of damage to chain-saws, and tends to lead to rapid wear of the bar, or the chain seizing 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 under lubricated.

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 cut. Special hardened chains (made with tungsten carbide) are used for applications where soil is likely to contaminate the cut, such as for cutting through roots.

The air intake filter tends to clog up with sawdust. This must be cleaned from time to time, but is not a problem during normal operation.

  Safety

  A chainsaw operator wearing full safety gear using a gasoline-driven chain saw

Despite safety features and protective clothing, injuries can still arise from chainsaw use, from the large forces involved in the work, from the fast-moving, sharp chain, or from the vibration and noise of the machinery.[5]

A common accident arises from kickback, when a chain tooth at the tip of the guide bar catches on wood without cutting through it.[6] This throws the bar (with its moving chain) in an upward arc toward the operator, often causing serious injury or even death.

Another dangerous situation occurs when heavy timber begins to fall or shift before a cut is complete — the chainsaw operator may be trapped or crushed. Similarly, timber falling in an unplanned direction may harm the operator or other workers, or an operator working at a height may fall or be injured by falling timber.

Like other hand-held machinery, the operation of chainsaws can cause vibration white finger,[7] tinnitus or industrial deafness.

The risks associated with chainsaw use mean that protective clothing such as chainsaw boots, chainsaw trousers and hearing protectors are normally worn while operating them, and many jurisdictions require that operators be certified or licensed to work with chainsaws. Injury can also result if the chain breaks during operation due to poor maintenance or attempting to cut inappropriate materials.

Gasoline-powered chainsaws expose operators to harmful carbon monoxide (CO) gas, especially indoors or in partially enclosed outdoor areas.[8]

  Working techniques

Chainsaw training is designed to provide working technical knowledge and skills to safely operate the equipment.[9]

  • Sizeup - This is scouting and planning safe cuts, before starting the saw.
  • Felling - The aim is for the tree to fall safely for limbing and cross cutting the log. It includes considerations for lean, bend, wind, branches, obstacles, snow load and tree damage. The goal is to avoid letting the tree fall on another tree or obstacle. After clearing the tree's base undergrowth for the retreat path and the felling direction; felling is properly done with three main cuts. To control the fall, the top and bottom cuts are made to form a wedged 45 degree hinge in the directional cut line. From the opposite side of the wedge, the felling cut is made horizontally and slightly above the bottom cut. When the hinge is properly set, the felling cut will begin the fall in the desired direction.[10] A sitback is when a tree moves back opposite the intended direction. Placing a wedge in the felling cut can prevent a sitback from pinching the saw.
  • Limbing - This is cutting the branches off the log. The operator must be able to properly reach the cut to avoid kickback.
  • Bucking - This is cross cutting the felled log into sections. Setup is made to avoid binding the chainsaw within the changing log tensions and compressions. Safe bucking is started at the log highside and then sections worked offside, toward the butt end. The offside log falls and allows for gravity to help prevent binds. Watching the log's kerf movement while cutting, helps to indicate binds. Additional equipment (lifts, bars, wedges and winches) and special cutting techniques can help prevent binds.
  • Binds - This is when the chainsaw is at risk or is stuck in the log compression. A log binded chainsaw is not safe, and must be carefully removed to prevent equipment damage.
    • Top bind — The tension area on log bottom, compression on top.
    • Bottom bind — The tension area on log top, compression on bottom.
    • Side bind — Sideways pressure exerted on log.
    • End bind — Weight compresses the log’s entire cross section.
  • Brushing and Slashing - This is quickly clearing small trees and branches under 5 inches diameter. A hand piler may follow along to move out debris.

  History

  Historical osteotome, a medical bone chainsaw

The prototype of the chain saw familiar today in the timber industry was pioneered in the late 18th Century by two Scottish doctors, John Aitken and James Jeffray, for symphysiotomy and excision of diseased bone respectively. The chain hand saw, a fine serrated link chain which cut on the concave side, was invented around 1783-1785. It was illustrated in Aitken's Principles of Midwifery or Puerperal Medicine (1785) and used by him in his dissecting room. Jeffray claimed to have conceived the idea of the chain saw independently about that time but it was 1790 before he was able to have it produced. In 1806, Jeffray published Cases of the Excision of Carious Joints by H. Park and P. F. Moreau with Observations by James Jeffray M.D.. In this communication he translated Moreau's paper of 1803. Park and Moreau described successful excision of diseased joints, particularly the knee and elbow. Jeffray explained that the chain saw would allow a smaller wound and protect the adjacent neurovascular bundle. While a heroic concept, symphysiotomy had too many complications for most obstetricians but Jeffray's ideas became accepted, especially after the development of anaesthetics. Mechanised versions of the chain saw were developed but in the later 19th Century, it was superseded in surgery by the Gigli twisted wire saw. For much of the 19th Century, however, the chain saw was a useful surgical instrument.

  McCulloch electric chainsaw

The origin is debated, but a chainsaw-like tool was made around 1830 by the German orthopaedist Bernard Heine. This instrument, the osteotome, had links of a chain carrying small cutting teeth with the edges set at an angle; the chain was moved around a guiding blade by turning the handle of a sprocket wheel. As the name implies, this was used to cut bone.

Two important contributors to the modern chainsaw are Joseph Buford Cox and Andreas Stihl; the latter patented and developed an electrical chainsaw for use on bucking sites in 1926 and a gasoline-powered chainsaw in 1929, and founded a company to mass-produce them. In 1927, Emil Lerp, the founder of Dolmar, developed the world's first gasoline-powered chainsaw and mass-produced them.

McCulloch and Industrial Equipment Corporation in North America started to produce chainsaws. The early models were heavy, two-person devices with long bars. Often chainsaws were so heavy that they had wheels like dragsaws. Other outfits used driven lines from a wheeled power unit to drive the cutting bar.

After World War II, improvements in aluminum and engine design lightened chainsaws to the point where one person could carry them. In some areas the skidder (chainsaw) crews have been replaced by the feller buncher and harvester.

Chainsaws have almost entirely replaced simple man-powered saws in forestry. They come in many sizes, from small electric saws intended for home and garden use, to large "lumberjack" saws. Members of military engineer units are trained to use chainsaws.

  Cutting stone, concrete and brick

  A chainsaw cutting concrete. The hose supplies cooling water.

Special chainsaws are used to cut concrete, brick and natural stone. These use similar chains to ordinary chainsaws, but with cutting edges embedded with diamond grit. They may be gasoline or hydraulically driven, and the chain is lubricated with water, because of high friction and to remove stone-dust. The machine is used in construction, for example in cutting deep square holes in walls or floors, in stone sculpture for removing large chunks of stone during pre-carving, by fire departments for gaining access to buildings and in restoration of buildings and monuments, for removing parts with minimal damage to the surrounding structure.

Because the material to be cut is non-fibrous, there is much less chance of kickback. Therefore the most-used method of cutting is plunge-cutting, by pushing the tip of the blade into the material. With this method square cuts as small as the blade width can be achieved. Pushback can occur if a block shifts when nearly cut through, and pinches the blade, but overall the machine is less dangerous than a wood-cutting chainsaw.

  See also

  References

  1. ^ Electric saw
  2. ^ ECHO Carving Series
  3. ^ Chainsaw carving page.
  4. ^ Masters of the Chainsaw - Chainsaw Competitions
  5. ^ "Chain Saw Safety Manual". Stihl. 1999. http://www.stihl.co.uk/pdf/chainsaw.pdf. 
  6. ^ Stihl, Chain Saw Safety Manual, pp. 12-16
  7. ^ Vibration Syndrome. National Institute for Occupational Safety and Health. Current Intelligence Bulletin 38: March 29, 2983. Retrieved December 22, 2008.
  8. ^ Carbon Monoxide Hazards from Small Gasoline Powered Engines. National Institute for Occupational Safety and Health. Retrieved December 22, 2008.
  9. ^ Chain Saw and Crosscut Saw Training Course Student's Guidebook 2006 Edition. USDA, US Forest Service. 29 December 2009. http://www.fs.fed.us/t-d/pubs/htmlpubs/htm06672805/page01.htm. Retrieved 18 February 2011. 
  10. ^ Husqvarna Operator's Manual (1153137-95Rev.2). 12/29/2009. pp. 43. 

  External links

  • How a Chainsaw Works., Popular Science, August 1951: Article with good illustrations and cutaway of a basic chainsaw.
   
               

 

All translations of Chainsaw


sensagent's content

  • definitions
  • synonyms
  • antonyms
  • encyclopedia

Dictionary and translator for handheld

⇨ New : sensagent is now available on your handheld

   Advertising ▼

sensagent's office

Shortkey or widget. Free.

Windows Shortkey: sensagent. Free.

Vista Widget : sensagent. Free.

Webmaster Solution

Alexandria

A windows (pop-into) of information (full-content of Sensagent) triggered by double-clicking any word on your webpage. Give contextual explanation and translation from your sites !

Try here  or   get the code

SensagentBox

With a SensagentBox, visitors to your site can access reliable information on over 5 million pages provided by Sensagent.com. Choose the design that fits your site.

Business solution

Improve your site content

Add new content to your site from Sensagent by XML.

Crawl products or adds

Get XML access to reach the best products.

Index images and define metadata

Get XML access to fix the meaning of your metadata.


Please, email us to describe your idea.

WordGame

The English word games are:
○   Anagrams
○   Wildcard, crossword
○   Lettris
○   Boggle.

Lettris

Lettris is a curious tetris-clone game where all the bricks have the same square shape but different content. Each square carries a letter. To make squares disappear and save space for other squares you have to assemble English words (left, right, up, down) from the falling squares.

boggle

Boggle gives you 3 minutes to find as many words (3 letters or more) as you can in a grid of 16 letters. You can also try the grid of 16 letters. Letters must be adjacent and longer words score better. See if you can get into the grid Hall of Fame !

English dictionary
Main references

Most English definitions are provided by WordNet .
English thesaurus is mainly derived from The Integral Dictionary (TID).
English Encyclopedia is licensed by Wikipedia (GNU).

Copyrights

The wordgames anagrams, crossword, Lettris and Boggle are provided by Memodata.
The web service Alexandria is granted from Memodata for the Ebay search.
The SensagentBox are offered by sensAgent.

Translation

Change the target language to find translations.
Tips: browse the semantic fields (see From ideas to words) in two languages to learn more.

last searches on the dictionary :

3104 online visitors

computed in 0.047s

   Advertising ▼

I would like to report:
section :
a spelling or a grammatical mistake
an offensive content(racist, pornographic, injurious, etc.)
a copyright violation
an error
a missing statement
other
please precise:

Advertize

Partnership

Company informations

My account

login

registration

   Advertising ▼

Poulan Pro PP4218A 18" 42CC 2 Cycle Gas Powered Chain Saw Home Tree Chainsaw (91.99 USD)

Commercial use of this term

HUSQVARNA 450 20" 50.2cc Gas Powered 2 Cycle Chain Saw Home Tree Chainsaw (260.99 USD)

Commercial use of this term

Poulan P3314 14" Reach 33CC Gas Chain Saw Chainsaw 2 Cycle Green (69.99 USD)

Commercial use of this term

20" Bar Gas Chainsaw Chain Saw 52cc Engine w/ Aluminum Crankcase Gasoline NEW (109.99 USD)

Commercial use of this term

Poulan PP3816 16" 38CC 2 Cycle Gas Powered Chain Saw Home/Tree Chainsaw Oiler (78.99 USD)

Commercial use of this term

Homelite UT10568 16" Bar Gas Powered 42cc 2 Hp 2 Cycle Chain Saw Tree Chainsaw (89.95 USD)

Commercial use of this term

Poulan Pro PP5020AV 20-Inch 50cc 2 Stroke Gas Powered Chain Saw w/ Carrying Case (149.0 USD)

Commercial use of this term

Poulan Pro PP4218AVX 18" 42CC Gas Chain Saw Chainsaw (97.99 USD)

Commercial use of this term

Poulan PP3416 16" 34CC 2 Cycle Gas Powered Chain Saw Home/Tree Chainsaw Oiler (100.99 USD)

Commercial use of this term

HUSQVARNA 460 Rancher 24" Bar Chainsaw 60.3cc 3.2Hp Gas Engine 2 Cycle Chain Saw (365.99 USD)

Commercial use of this term

Husqvarna 450 18" Bar X-Torq 2-Stroke Gas Powered Chain Saw Chainsaw -Recon (259.99 USD)

Commercial use of this term

New Husqvarna 440e 16" 40.9cc 2.4hp 2 Cycle Gas Powered Chain Saw Tree Chainsaw (289.95 USD)

Commercial use of this term

Poulan 33cc 14-in Gas Rear Handle Chain Saw 952991608 (76.98 USD)

Commercial use of this term

NEW 576XP Husqvarna Chainsaw with 20" bar & chain in original packaging (790.0 USD)

Commercial use of this term

Refurbished HUSQVARNA 435 16" 40.9cc 2.2hp Gas Powered Chain Saw Chainsaw (183.99 USD)

Commercial use of this term

Stihl MS 362 Chainsaw 20" bar and chain LOW LOW hour saw!!! (528.88 USD)

Commercial use of this term

TIMBERPRO 62cc Petrol Chainsaw, 20" Bar & 2x Saw Chain. Alloy & Assisted Start (79.99 GBP)

Commercial use of this term

NEW SOLO CHAINSAW 36cc 1.9hp GAS POWER SAW 635-16 BAR & CHAIN 635-16 (200.0 USD)

Commercial use of this term

chain saw tree husqvarna 2 Cycle Gas Chainsaw power trimming yard cutter 18 ATV (264.0 USD)

Commercial use of this term