Type of links. design or shape of the link
According to the form, modern sawing equipment is of two types. chipper and chisel. each type differs structurally, affecting performance parameters and sharpening features.
- Chipper links look like a sickle and have low performance. Their main advantage is considered the ease of sharpening with a file. Due to the ease of sharpening, many sawyers prefer to choose models with chipper or sickle-shaped links
- Teeth are shaped like a number “7” with a pointed corner. These teeth on the chain show high performance, but are difficult to sharpen with a file
Chisel and chipper link types. take note
In the wide and heavy chains of top-class professional equipment, each link has a pair of shanks. This ensures firm contact with the bar and sprockets and allows the tool to withstand the heavy side loads. Half of the cutting links in a conventional chain are.
In order to lighten up household class tools, there are so lightweight inexpensive models:
- skipping. the support link with the shank are installed immediately behind the cutting link, their share is reduced to 40%;
- Half-tracks: A support link is fitted after every other cutting link. 35% of the share.
A reduction in the number of active links results in a proportional increase in the load on the others. This inevitably leads to a shorter lifespan and more frequent sharpening.
You can choose this type of chain if you do not want to spend too much money, if you do not have to do a lot of work and if the type of work is sporadic.
How to know
There are several ways to know the pitch of a chain:
- To see the pitch on a saw bar. Saw manufacturers, necessarily indicate the length of the bar, slot width and sprocket pitch on the shank of the saw blade.
- Measure the distance between the shanks of adjacent teeth or the centers of three adjacent rivets.
- The way that works for brand name packaged chains is to look at the specifications of the chain on the box.
How to Measure a Chainsaw Chain
STIHL on the packaging of STIHL chains has comprehensive product information which not only shows the distance between two adjacent chains, but also the teeth type, chain width and recommended file size for sharpening.
How to find out
The question of selection is relevant for inexperienced users. Professionals know almost everything about chainsaws and know how to choose what they need. That’s why our tips are aimed at hobbyists and not pros. So here we go.
In order to make the right choice you need:
- Know the characteristics of the chainsaw, namely the pitch and length of the bar. It is not necessary to rely on the name and the model of the chainsaw when choosing a saw.к. One chainsaw can be fitted with bars of different length and width.
- Decide in advance on the amount and type of work for which you plan to use it. If you want to cut crosswise, choose a cross cut, lengthwise. a chipper.
Important! You have to sharpen longitudinally (10 0 ) yourself or in a service center. There are very few chainsaws on the market that are sharpened for longitudinal cutting.
Separate note: STIHL accessory selection. If you plan to buy a chain of this manufacturer (they are currently considered the highest quality), then it is better to use a special search form, which can be found on the website of the company.
If you enter your chainsaw data in the search box the STIHL tool will automatically find a suitable outfit for you. This service is user-friendly, but has a big disadvantage: the search is based only on STIHL chain saw models. If you want to choose chain for other brands you will have to use catalog.
Rules of Usage
The left column shows the most popular chainsaw models. All other columns show tire sizes and other operating parameters of the saw headset. This layout means that any beginning chainsaw user can find the right machine for his product in no time at all.
In some situations, chainsaw owners may be confused by all the markings on the chainsaws. This results in unsuccessful purchases. The choice of chainsaws is often determined by just a few basic criteria, one of which is the chain pitch. This indicator helps to identify future capabilities of the tool, including its cutting speed, as well as by the standards should correspond to the power level of the engine. How are chains marked?? Let’s get to the bottom of this!
The main performance characteristic of chain saws is productivity, which is mainly influenced by the engine power and the quality of the saw chain. When getting the saw ready for work, it is also important to tuck it in correctly. To do this you first fill the tank with any CU or JASO approved oil, and then add gasoline. The resulting mixture is mixed thoroughly. The choice of chainring is strongly influenced by the capabilities of the tool. When buying it, you need to pay attention to the marking, the correct deciphering of which will help you choose a chain. On the leading links and in the technical passport of the chainsaw such parameters are shown:
- Chain pitch and size.
- Thickness of drive links (shanks) and connecting links.
- Cutting depth and length.
- Number of cutters.
- Sequence of links. In order to install the right chain on a chainsaw, let’s analyze these parameters in more detail.
Pitch and Shank Thickness Calculation
Pitch is the distance from one apex of the drive link to the other. To determine this parameter, you need to measure the length between the axes of two nearby rivets, and the resulting figure in centimeters to translate into inches, dividing it by 2.54. The greater the pitch, the more productive the saw is. But to pull chains with a small pitch, you need a more powerful motor to turn the drive sprocket. Manufacturers produce chain products with the most common pitch sizes 1/4; 0,325; 3/8 (0,375); 0,404; 3/4. This measurement should be the same as the pitch of the drive and idler sprockets. However, there are non-standard saws, for example, Kalibr BP 220-18U, which has a pitch of 0.366. When a chainsaw works, the main load is on the chain, the strength of which depends on the thickness of the shanks and connecting links. It can be measured with a caliper. For example, a chainsaw Kalibr BP-1800 has the chain thickness of 1,3 mm. The thicker the links and the wider the guide groove on the bar, the stronger the chain. This chain requires a heavy-duty chainsaw. The depth of cut determines the kickback and cutting speed. It is directly proportional to the kerf.
How to know the profile size and height
The depth of cut is influenced by the profile height and the number of cutting elements. the higher it is, the deeper the tooth goes into the wood being sawn, causing vibrations that wear out the chain saw drive faster. Now you can buy low-profile and high-profile chain products. As a rule, low-profile chains have a greater pitch and are mounted more often on home appliances. Cutting length is comparable to the distance between the tip and the nose of the guide bar. It indicates how thick a log or piece of wood can be cut with the chain saw.
The number of drive links determines the size of the chain. Its size depends on the performance of the saw with an internal combustion engine and corresponds to the length of the bar. The technical data sheet shows the bar length suitable for certain models of chain tool. To avoid breaking it, it is advisable to follow these recommendations. Sometimes in order to fit a longer chain to the bar, it is shortened by removing a few links. This should not be done because it cannot be riveted securely with a crude method, and it may break during operation, injuring others. However, the length of the bar does not determine the exact size of the chain product. Before buying, its total length can be counted by taking it out of the package, by the number of shanks or connecting links. Not critical if the roll is a couple of links longer. The chain can be tightened with the tensioner.
Sequence of links
Companies producing such equipment and spare parts for it produce chains, in which links are arranged in different sequence, which determines the efficiency of. Depending on the location, there are these types of chains:
Figure out what size chain you need without stampings on the bar. Chainsaw Chains 101
In chains of the first type, there are two shanks per cutting element. In products with a half-skip, the links in two are replaced by a connecting link, and with a skip, there is a connecting link instead of every other cutter. Chains with a skip have less performance and wear out faster.
Which guide bar and chain is best for a chainsaw?
In some situations, chain saw holders can have some confusion in understanding all of the label designations for these tools. This results in unfortunate purchases. Chainsaw selection is often determined by only a few basic criteria, one of which is chain pitch. This indicator helps to highlight the tool’s future capabilities, including its cutting speed, and it is also required by regulations to match the power level of the engine. How chains are labeled? Let’s find out!
Pitch and Size
The pitch is the intermediate distance between three rivets that are adjacent to each other. To correctly calculate the chain pitch, measure the distance between the axes of the three rivets that are close together. In the form of a formula, this looks like this
Where L. is the pitch length which, in chainsaws, is the distance between two teeth in relation to each other;
S. The amount of clearance between the two rivets of the three rivets.
Pitch size can also be equal to the distance between two neighboring shanks.
Regularity: The greater the distance between the cutting teeth, the deeper they will cut into the saw’s material
By increasing the chain pitch it is possible to increase the performance of the chainsaw. However, in this case the degree of force applied varies in order to make the drive sprocket rotate. And the higher the pitch of the chain, the greater the power of the motors and the more physical forces that are used for pulling when cutting materials.
Chainsaw chain chain. Table
Considering the pitch size, chains are not currently divided into several subtypes:
As you can see from the table, the step of the circuit is designated as a regular number (3/4), and the decimal. “0,375”. This division is caused by the similarity of the decimal values. “0.325” and “0.375,” as the difference in one digit created confusion when choosing a saw. That is why it was decided at one time to establish two different designations: decimal and regular fractions.
The pitch is imprinted in the area of the special cutting edge on each tooth.
The advantages of large pitch chains include:
But it should be noted that a wide kerf requires the use of a more powerful motor, which in turn significantly increases the resistance.
Advantages of small step circuits:
Advantages are achieved because of the large number of teeth and the short distance between them.
All known classification of chains is based on the features of their marking depending on the step, which is designed for specific needs and intended for a certain power of electrical equipment. For a better understanding of each pitch type, they should be considered separately.
Key chain parameters
The use of chain marking implies the following parameters:
- “0,325”. is the most common and minimum pitch used in semi-professional and domestic low-powered chains. The standard power value for this pitch ranges from “0.325” to “3hp,” but no higher than “3.5l.s”. When working with this type of chain saw goes more smoothly, comfortably, without “rips” of processed products.
- “0,375” (“3/8”). applies to chain saw with 4 liters of power.с. This chain is used for cutting medium- and small-thickness wood.
The accuracy and the cutting quality of your saw depends on the pitch. When the importance of achieving high quality in a chainsaw’s operation is of little consequence, cutting precision is of particular importance. For this it is necessary to take into account the dependence of the step on the dissolution of the wood according to the pre-marked marks.
How to choose a guide bar and chain on your chainsaw. All the nuances
I have seen many similar videos on the internet, but they are complicated and hard to understand for the average user. I tried.
Choice of bars for chainsaw
for chainsaw. In this issue we will look at different tires, find out their dimensions, take measurements, discuss.
- The thickness of the drive links (tail). When the chainsaw is running on its chain, it has the most load. With this in mind, another major characteristic of the saw’s performance is the thickness of the link elements that enter the grooves of the bar. This parameter also determines the total thickness of the attachment links, which is measured with a standard caliper. Standard Thickness:
- “1.1 mm” (“0.043”) and “1.3 mm” (“0,05”). used in the production of entry-level circuits that are designed for small jobs. Often with these link thicknesses, the chain pitch can be “0.325”, which implies low loads and gentle operation. Therefore, they are used in domestic and semi-professional devices;
- “1.5 mm” (“0,058”). the most common thickness size on the market for chainsaws and accessories. This value can ensure safe working with a pitch size of “3/8”. Chains with a thickness of 1.5 mm are not designed for professional cutting;
- “1.6 mm” (0.063) and “2.0 mm” (0,08). are designed for the most demanding work. The metal in the manufacture of such chains is steel of special grades, and in the design characteristics of increased strength.
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The thicker the link thickness and the wider the bar groove, the higher the quality of the chainsaw, as it is able to withstand heavy loads.
- Cutting depth. is a distinctive feature of manufactured chains and is characterized by the height of profile of cutting teeth. It is measured by the gap between the stops and the cutting top edge. the market can be represented as high pitch (0,762 mm) and low pitch (0,635 mm) types of chain products.
The higher the height of the profile, the higher the material input (depth) and the higher the cutting speed
High-strength chains are installed on chains with higher engine power. Information about the height of the profile is usually found in the appliance’s data sheet.
The profile influences the vibrations that subsequently cause wear of the drive or problems when holding the tool in the hand. In this case, the higher the cutting parts, the greater the degree of vibration.
Household chainsaw types are equipped with a low profile. In semi-professional devices it is possible to combine different types of schemes. However, in most cases they stick to the principle:
In a chain with a high pitch, the low profile is also set at “0.325. high
Such changes increase the cutting speed not due to the pitch, but due to changes in depth or height of the profile. Although in professional tools Accent is made to activate, explaining this by the fact that the chainsaw becomes more controllable.
- The geometry of the cutting teeth. The profile can be of two basic types:
- shredder (people have a “sickle”). It has a crescent shape and is characterized by high performance. Easier to sharpen during operation and does not require sharp sharpening angles. Disadvantage: risk of high stress and reduced cutting performance;
- chisel (popularly called “seven”). has a straight working surface in the shape of a number “7. They are used in chains with a pitch of 0.404 or 3/8 on professional saws. The main disadvantage of cutting links is the difficulty of sharpening the cutting elements and sensitivity to dirt.
- Number of cutting teeth. is defined as the ratio of the number of teeth to the number of guides in the bar. In chain saws of good manufacture, it is necessary to combine two guide links in the cutting part of the tool.
- Type of link grinding. directly depends on the type of work to be done. Classic chainsaw types are mostly used for crosscutting trees and are rarely used for longitudinal sawing. Given the resistance of the wood in both cases, a different link angle can be used in chains. On building counters you can now find chains with the following types of cutting links:
- longitudinal chain type. involves cutting wood along its grain. Cutting angle reaches 5-15 degrees.
- cross type. Cutting is performed crosswise. The cutting angle in chains is 25-35 degrees.
- Chain length. Depends on the parameters and specifications of the chainsaw itself: power, size, etc. д. if the chain is of normal or normal tensioning, the length of the chain is most often mentioned in the technical data sheet.
- Order of links. the sequence of links can be different:
- Standard. for each cutting line there are two leading mowing lines in the chain
- with a semicircle. every third position in the chain is replaced by a so-called connecting link;
- with a gap. at the location of every other mowing line to cut the connecting mowing line.
READ STIHL 180 chain saw does not start Video
Why do I need to skip links in a chain? The quality of the cutting links are the most important thing in chains, because they are made using special methods and are very expensive, unlike the connecting links. If you can’t shorten the chain, the only way to reduce the cost of the chain. pass on the cutting elements. In operation, chains with links show a reduction in performance and wear out quickly.
In general, wishing to buy a tool for sawing wood with maximum efficiency, do not be lazy to further study the chainsaw markings for chain saws, also listed in the instructions for the tool.
Number of Links in a Chainsaw Chain
Knowing these three parameters makes it easy to select a chain for your saw, pole pruner or harvester head.
The chain pitch is usually expressed in inches, calculated as follows: the distance between the nearest drive links in the chain, or the distance between the three nearest chain rivets (from the center of the rivet) is measured, divided by 2 and translated into inches (1 inch = 25.4 mm).
The pitch of the chain must always be the same as the pitch of the saw’s drive sprocket and the bar sprocket.
- Chain with pitch 0.25″ aka 1/4″. To convert the distance between three rivets (drive links) 12.7 mm ÷ 2 = 6.35 mm in inches (÷ 25.4) this is 0.25″ (often called 1/4″).
- Chain pitch 0.325″. Spacing between three rivets (drive links) 16.5 mm ÷ 2 = 8.25 mm translate to inches (÷ 25.4) in inches is 0.325″.
- The chain with a pitch of 0.375″ aka 3/8″. Translate three rivets 19 mm ÷ 2 = 9.5 mm into inches (÷ 25.4) which is 0.375″ (referring to 3/8″ to avoid confusion with 0.325″).
- Chain pitch 0.404″. The distance between three rivets 20.5 mm ÷ 2 = 10.25 mm converted to inches (÷ 25.4) in inches is 0.404″.
- Chain with 3/4″ pitch. The distance between three rivets 38.1 mm ÷ 2 = 19.05 mm converted to inches (÷ 25.4) in inches is 0.75″ (commonly referred to as 3/4″).
The thickness of the chain is the thickness of the drive link (can be measured with a caliper). This dimension must always match the thickness of the guide bar groove.
For electric and gasoline powered saws and harvesters there are a total of 6 sizes that determine the thickness of the drive link:
The third main parameter when selecting a chain: Length of chain (Number of drive links).
The chain length is determined by counting the number of drive (inner) links in the chain. Important:
- The cutting links do not determine the chain length (do not count them).
- The length of the guide bar does not determine the exact length of the chain (for example, a saw with a 16″ (40 cm) bar may have a 55, or 56, or 57 link chain, depending on the chain tensioning mechanism of the particular saw model).
- you will not fit the chain length of about 55-57 links, only a certain size recommended by the manufacturer of the saw.
What’s the bar length on my chainsaw??
The cutting length of the bar is different from the total length of the bar. The length of the bar is commonly thought of as the length of the cut (the working part), which is the distance from the front of the saw to the rounded tip of the nose of the bar. This size is rounded to the nearest one in inches or centimeters. An inch is marked as ” equals 2.54 centimeters.
How to count the Drive Links in your chainsaw chain.
For example, the cutting length of the bar for the STIHL MS180 chain saw is 40 cm. 40 cm ÷ 2.54 = 15.7 inches. With rounding, you get 16″ (inches).
For the STIHL MS180 chain saw the Oregon 16″ (40cm) 160SDEA074 bar will fit.
The concept of pitch
The pitch is half the distance between adjacent shanks or between three adjacent rivets.
There are several sizes, 1/4 inch is the smallest, 3/4 inch is the largest and 3/8 and 0.325 inch, the most popular.
The pitch is a parameter that not only the headset has, but also the sprockets of the bar and chainsaw.
Important! All three elements, chain, sprocket and guide bar, must have the same pitch; otherwise proper installation and correct operation is impossible.