The chain saw , or "chain cut", is a key component of the saw. It consists of a steel junction incorporated by a rivet, and superficially resembles a bicycle-style roller chain, although closer in design to the leaf chain. The main difference is the sharp tooth cutting on the outside of the chain loop, and the flat drive link on the inside, to maintain the chain on the chainsaw and allow propulsion by the engine or motor.
Saw chains (and chainsaw generally) are used to cut wood. It is possible to harvest trees for pulp or wood, for tree operations, or to process firewood.
Whether for whipsaws, mechanical loggers or mortise chains, the chain saw has progressed dramatically since its discovery. Modern chains designed for high power, high-speed sawmills will greatly outperform old designs, while allowing a much greater level of security and reliability to use.
Video Saw chain
Principles of chainsaw operation
The chain saws operate by being pushed around the guide bar, removing the material from scratches by cutting the chip from the side and bottom. In order to operate properly, the depth of each cutting of the tooth should be limited to prevent it from binding the wood. The Scratcher chain, like a tooth in a whipsaw, uses only a lot of teeth to prevent individual teeth from sinking too far without undue pressure on the bar. The chipper chain, and all subsequent designs, combine depth gauges (also known as "shelf") on each cutter link to limit the cutting depth on each tooth. It has two distinct advantages over the scratcher chain - allowing the use of fewer cutters per unit of chain length, allowing shorter downtime to sharpen, and resulting in a more open "open" chain layout, allowing much more chip cleaning and debris both from garitan. Individual depth measurements on each tooth also allow the use of passing chains. The leap or semi-jump chain has a further reduction in the number of gears and is used for applications where a lot of debris is produced, such as tearing or cutting large pieces of wood. The leap chain also absorbs less power from the motor per unit chain length rather than full complementary chain, allowing the use of longer bar/chain combinations on a given motor.
Maps Saw chain
The original chain saw design
Teeth Scratcher
The very earliest saws use a tooth configuration that is very similar to a conventional hand saws. It is a very simple saw tooth following wave pattern (left, middle, right, center) without such depth gauge, depends entirely on the pressure bar to limit the cutting rate. They are inefficient and slow to use, and are soon replaced by chipper chains. They need great skills and plenty of time to sharpen on the pitch leading to an extended break between sessions.
Teeth cutter
The chipper chain created by Joseph Cox increased dramatically in the performance of the scratcher chain. Chipper uses a curved tooth above the chain, with alternate teeth pointing to the left and right. In front of the tooth there is a depth gauge, which allows good cleaning around the teeth to clear the chips while limiting the cutting depth and preventing grabbing or overloading. Chipper chains are sometimes used for dirty work, because very large working angles allow the cutter to maintain its effective acuity for long periods in abrasive conditions.
Modern dental design
Modern Cutting Teeth
Modern chains for general use in forestry, tree operations and firewood cuts have three basic configurations: full chisel, semi chisel, and chipper chains.
Chain chains full see
Full chisel chains have square-cornered teeth, cut wood fibers easily cut for quick and efficient cuts in clean softwood. Chain chains have a high kick-back risk due to missing and more sensitive safety chain elements to dirt. These chains are available for semi-pro (also called pro-sumers) and professional chainsaws.
Semi-chisel see chains
The semi-chisel chains have teeth with rounded corners formed by the radius between the top and side plates. While slower than the full chisel in softwood, it retains a longer acceptable cutting edge, making it the preferred choice for dirtier, hardwood or dried wood, frozen wood or stump work, all of which will quickly lower the chisel chains full. The variation of the semi-chisel chain is the "Chamfer chisel" chain made by Oregon. They are similar to semi-chisel designs but have a small 45-degree gap between the plates rather than the radius. Its performance is similar to a good semi-chisel. The semi-chisel chains have a lower kick-back risk. This chain is available for consumer, semi-pro and professional chainsaws.
Low profile chains
Low-profile chains are chains with low teeth and security elements between teeth. This chain is used on consumer saws for inexperienced operators. This chain is more sensitive to dirt, but requires more frequent sharpening.
Rantai chipper
The chipper chain is similar to a semi-chisel chain. The main difference between the size of the radius in the working angle. The cross section of the chipper's tooth looks like a question mark, has a full radius throughout the cutting part of the tooth, while the semi-chisel design is more like a "7" with the upper right corner slightly rounded.
Chain settings
There is also a different set of teeth on the chain.
Complete Complementary Chain
The chain has a left cutter, a drive link, a right cutter, a drive link setting, and is used for most apps.
Skip the chain
Has a left cutter, propulsion link, drive link, right cutting arrangement. It has 1/3 fewer cut teeth and is commonly used on long bars (24 ") for extra chip cleaning or when the bar is longer than ideal for the given power head is used.The fewer teeth require less power to operate.
Semi-Leap Chain
Alternates that have one or two link drives between the pair of cutters, for performance among the complete and skip arrangements.
The terms used to describe chain settings can be confusing. Most modern chains not only have cutting teeth and propulsion links. There is a strap that separates the cutter from each other.
Network specifications and dimensions
Cutting chains are present in a large number of configurations, but these are reduced to several key dimensions for replacement purposes or specifications.
Ukur
The chain gauge is the thickness of the drive link, and is determined by the gauge of the bar to be run. The regular gauge is 0.050 "(1.3 mm) - 0.058" (1.5 mm) and 0.63 "(1.6 mm).The chain and gauge bar must match: the too large chain will not match, which is too small will fall sideways and cut badly.
Pitch
Chain pitch is the average distance between two rivets. Since the distance between rivets varies, pitch can be measured by measuring between three rivets and dividing this distance by two spikes. Typical pitches are 0.325 ", 3/8" (0.375) and 0.404 ".3/4" used for reaper applications, and very rarely for hand-held deductions. The chain pitch should match the drive sprocket, and the nose sprocket (if installed). Sprockets and rims can be in one unit or apart.
Length
A chain loop must be of the appropriate length in order to run safely. This is explained by the number of drive links. This number is determined by length and bar type, sprocket size and overall configuration of the saw. For replacement purposes, simply count the drive link in the old chain.
Chain life time
Chain teeth have a certain length. Wearing and sharpening causes the teeth to become shorter. End of life is reached when the top of the head is too short.
Interval between sharpening
Chain chainsaws should be sharpened when the saws start to vibrate or cut badly. The operator can easily feel the vibrations on the hilt and the engine works harder while cutting.
Identify chains
Length, gauge and number of drive links are hit on the saw side. This information can be found near the chainsaw head. Since the saw should be rotated 180 degrees between sharpening, the hit information can lead to a saw's head or outside.
Identify appropriate chains
See the chainsaw guide to determine which chains or bar combinations are compatible with the saw. The given saw will usually receive a number of different bars and chains.
Custom chains
A number of very special types of chains have emerged over the past few years. These include chains made of steel alloys that are optimized for cutting in very cold conditions, chains with teeth tungsten carbide for very dirty conditions and rescue work, tearing chains with modified blade geometry to make ripping pieces, and milling chains for saw mills.
Chain mortisers, used to cut large mortice mortice and tenon wood framing using a number of chains, are glued side by side. They are used with the first vertical-falling tip. Because of the difficulty of repairing many teeth, it is usually made of durable tungsten carbide.
Join the chain
Chains are usually bought ready-to-join in length, in accordance with certain bars. All saws have an adjustable bar holder to allow for their tailored chain tightness, allowing for use in chain relationships. There is no requirement to remove a link to shorten a worn chain, the chain will fade on their cut teeth before being worn on their pivot into a problem. Adjustments also allow enough looseness to allow the chain to be installed, so there's no need to "split the links" when installed, just like for a bike.
Large-scale operators and retail stores can buy bulk chains on rolls. It should be cut and combined with the length done by inserting rivet pins. These non reusable pins are usually paired into half links and must be paired on half the links on the other side. Because this peening is done with a rotary device mounted on a bench, rather than a hammer, it is referred to as "spinning rivet". These devices are usually hand-driven, or may be electrically powered for mass production.
See also
- Joseph Buford Cox, inventor of chipper chain saws.
- Chainsaw security features
- Chainsaw security clothing
References
External links
- Oregon looks at chain maintenance and safety manuals (PDF)
- "Sawtooth saw gallery". Stihl.
Source of the article : Wikipedia
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