Longitudinal Chains For Chainsaws The Difference
Rip sawing is a sawing process that runs parallel to the natural grain of the wood. In this case, circular discs are used, in which the incisors are inclined, their pointed edges effectively cut the fibers, they begin to flake off and form sawdust.
The principle of operation of this nozzle for a chainsaw is similar to the principle of operation of all centrifugal pumps. A hose is connected to the central fitting (1), which is lowered into the water. A pressure hose is connected to the fitting (3). Before starting work, water is poured into the plug (2), which is necessary for the pump to start pumping.
Chainsaw Sharpening Rip Saw
By design, debarkers are subdivided into drum and disc. The former are mainly used for removing bark from logs (lining), mounting grooves, cups, grooves, etc. are cut out with discs.
The working part of the devices consists of a drum or cutter fixed in a bearing unit. Like most chainsaw attachments, the debarkers are driven by a V-belt drive. On their axis there is a driven pulley for this. By selecting the diameters of the pulleys and changing the engine speed with the help of the accelerator, it is possible to obtain the optimal rotation speed of the working tool, providing the necessary processing parameters.
Sharpening the rip saw chain
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The rotation speed of the auger during drilling should be relatively low, therefore a gearbox is used to reduce the number of revolutions. It can be made in the form of a V-belt or worm gear (preferred).
Sharpening the rip saw chain by hand
We drag the saw chain for sawing wood along the grain. We prepare the saw headset for work with.
Saw blade design
Choosing the right blades for effective rip sawing. It is noted that the larger the teeth, the easier such a sawing is (for comparison, when working with cross cuts, large teeth act very roughly and literally tear wood, which leads to chips). The cavities between such teeth must also be as deep as possible. in this case, the removal of chips will be of better quality. The optimal number of teeth for longitudinal cutting varies from 20 to 24 pieces.
Fine-toothed discs should not be used when working with rip cuts, this is fraught with a decrease in the speed of work, significant overheating of the device and such unpleasant consequences:
- the saw blade starts to glow;
- the saw often goes sideways from the mowing line of the cut;
- in areas of overheating, the material begins to “swell” and friction increases significantly;
- the saw deforms and looks more like a propeller than a cutting surface.
On some models, they are partially filled with copper compounds, which reduces noise levels and helps to quickly cool the engine. Sawing wheels are usually poured from one metal (they are called monolithic) or with the inclusion of solders from various hard alloys. Each of the options has its own pros and cons.
- Monolithic. as a rule, they quickly become dull, so they have to be sharpened and corrected. However, this procedure is quite simple and uncomplicated, so it can be done independently at home. Typically, such blades are used for both rip and cross cuts. The cost of such equipment is quite affordable.
- Carbide wheels are much more expensive, but at the same time the period of their use until the very first sharpening is longer. The sharpening of this tool can only be carried out on specialized equipment. Despite this, it is these canvases that are more in demand among consumers, since their cost pays off much earlier than there is a need for resharpening. Carbide wheels do not only work well on wood, but also on materials such as metal, laminate or pressed board.
Special attention should be paid to several parameters of electric saws for longitudinal use.
- Radial or face runout. For carrying out particularly accurate work, one of the most important indicators is the deviation of the circle from the main cutting plane. If there is a radial or end beating, then it can disturb the sharpness of the cut. The optimum allowable runout is 0.15 mm, and the highest quality models have a parameter within 0.05 mm.
- Keep in mind that rip cuts should not be made with miter saw blades; they have a different path of movement of the blade in the wooden part. For example, circles for pendulum tools are usually at a negative angle. this reduces the load on the motor, and the cutting edges are faster and easier. As a result, the efficiency increases when compared with a disc disc with teeth located at a positive angle. If such a disc is mixed along the trajectory of the pendulum, then the saw will simply cut into the fibers with not the sharpest parts of its teeth. All this leads to an increase in the load on the motor, overheating and a decrease in work efficiency. If discs with teeth sharpened at a negative angle are used for a circular plate, the wood will begin to repel, and the sawdust will not come out well. in this case, the sawing is much slower.
Sharpening the rip saw chain
The chainsaw can be called a fairly common tool that is used to cut wood. Mechanical processing in this case is carried out by means of a special saw chain, which is fixed on a special tire. Long-term and improper operation quite often becomes the reason why dismantling and sharpening have to be carried out. At the same time, there are no problems with removing the chain for ripping and putting it on today, but there are still problems with direct sharpening. Let’s consider the features of such a procedure in more detail.
Chainsaw sharpening template
To significantly simplify the procedure, it is recommended to purchase a special template, due to which the procedure for setting the required angle is greatly simplified. Such a tool allows you to check the value of the clearance angles of the conical and upper blades, as well as the leading edge of the cutting edge.
The experts point out that it is most important to use a template to control the clearance angle. This is due to the complexity of changing this indicator, while it must be kept within a strict range.
A fairly common indicator is the grinding angle, which also varies depending on the task.
Too high hardness of the material determines the need to reduce this indicator. Experts point out that the optimal value varies in the range from 10 to 12 °.
External signs of a blunt cutting edge of a chainsaw tooth
Sharpening the chain for rip sawing, as a rule, is carried out exclusively when worn; periodically, the procedure is extremely rare. That is why you need to know which signs indicate the need for such a procedure. Among the features of the issue under consideration, we note the following:
- Chainsaw rip chain teeth are characterized by a complex configuration, therefore, it will not be possible to identify defects simply by visual inspection.
- A trial sawing is carried out to check the condition of the teeth. If vibration occurs while performing such work, this indicates the need for sharpening.
- The condition of the rip saw chain can also be determined by visual inspection of the chips. Coarse chips and dents also indicate a need for service.
- The force of the chainsaw is also taken into account when assessing the condition of the chain. At first, when sawing, the plates easily enter the material, but with strong wear, even at the beginning you have to apply force.
A visual inspection can also reveal curves and tapered areas, which indicate chain wear and other defects. However, such a symptom can only be detected by a specialist with extensive experience.
Saw chains for rip sawing with chainsaws
The modern rip saw chain is represented by a rather complex structure, which is made using high-quality steel, which is characterized by increased wear resistance and corrosion resistance. Among the features are the following:
- The design is represented by separate links, which are interconnected in a special way. This provides a high level of flexibility, the rip saw chain can follow the complex shape of the bar.
- There are several different types of inserts for use: cutting, guiding and connecting. Cutters carry out direct material removal.
The natural process of operation becomes the reason for the wear of the cutting inserts. In addition, violation of operating recommendations can also lead to a similar result, for example, if soil gets into the cutting zone.
That is why all owners of such a tool should pay attention to exactly how sharpening is carried out.
Grinding angles and saw tooth configuration
As noted earlier, the product in question is characterized by a rather complex configuration. Among the features of modern execution options, the following points can be noted:
- The choice of a chain for ripping is carried out for a specific model of chainsaw, since the configuration largely depends on power and some other points.
- For rip cuts, the insert pitch is 0.325 inches. This ensures high stability at the time of operation.
- The cutting edge can be 1.3 mm thick. There are also versions on sale that have a thickness of about 1.1 mm, but they are difficult to sharpen at home. In addition, the small thickness allows cutting of thick branches.
- Attention is also paid to the height of the profile, which varies in the range from 0.625 to 0.762 mm. For domestic versions, a low profile version is suitable. This indicator determines the likelihood of vibration at the time of sawing.
The sharpening angle of a chainsaw chain largely depends on the purpose of the tool, as some are suitable for cross-cutting, others for sawing. The longitudinal sawing resistance of the wood is very high, so the edges must be very sharp. The recommended sharpening angle is 6-12 °. The difference in cutting angles is selected depending on the task, as well as some other points.
When doing the work, do not forget that too low a sharpening rate becomes the reason for the rapid grinding of the edge. This point is the most important in the case when the product is manufactured using alloy steels, for example, grade 40HGS.
Mechanized sharpening by machine
Quite widespread are special tools that can be used to simplify the procedure. Such machines are equipped with a special electric drive and grinding wheels with increased wear resistance.
Small tools are suitable for home use. Such devices can be powered from a 220 V network, and at the same time the power consumption indicator is 100 W. The installation of the chain is quite simple, the sharpening procedure can be carried out even without special training.
When choosing a machine, attention is paid to the following points:
- Adjustment of the sharpening angle in a certain required range.
- Possibility of machining chains with different pitches and cutting edge thicknesses.
- Features of the procedure for changing the grinding discs.
- Checking the value of the cutting width.
- Installed electric motor power and energy consumption indicator.
In addition, it is recommended to pay attention to the popularity of the brand, since the service life and many other points depend on it.
Note that mistakes made at the time of sharpening can cause increased chain wear. That is why, with frequent use of the tool and the absence of a required sharpening machine, it is recommended to entrust the work to professionals who provide the appropriate services.
In a medium and high-end chain, each cutting link is equipped with two shanks, which inevitably increases its cost. Owners of their own chainsaws are offered more affordable models of the through or semi-through type.
In the first case, additional chain elements are located immediately after the cutting link. In the second version, the connecting elements are mounted after every second pair.
In standard, through and half through chains, the number of saw links is 50, 40 and 37.5 percent, respectively. The simplification of the design of cheap products is inevitably accompanied by an increase in the load on the saw links, the need for frequent sharpening and a reduction in its service life.
Sawing depth and chain height
These parameters should be known to owners of professional models who sharpen chains by hand at home. The depth of cut is adjusted by decreasing the stop height of each cutting link.
Low profile and high profile chain settings are 0.025 and 0.03 inches, respectively. Knowledge of the profile types is necessary to select the correct height of the restraints.
Chain models for cross and rip sawing
The main range of saw chains with a 25-35 ° angle sharpening of the cutting links is designed for standard cross-cutting of wood. Models for longitudinal sawing on the domestic market are present in a minimum quantity.
If necessary, the problem of shortage is simply solved by changing the sharpening angle of standard chains to 5-15 °. The tire in this version is operated without changing the design.
All information provided is valid for Chinese chainsaws and their accessories. Most of the Chinese chainsaw range are more or less successful copies of leading European developers, so all standards are almost identical.
Types of materials
Standard saw chains are manufactured from high quality chromium-nickel steel. Carbide link chains are recommended for heavy and frozen wood. A significant drawback of such models is the increased cost and the need to use special sharpening equipment with corundum nozzles.
Pro tips for the operation and maintenance of saw chains
A significant part of the operated headsets do not fully develop the assigned resource.
The main reasons for forced wear are:
- low efficiency of the lubrication system;
- a high degree of wear on the drive sprocket;
- excessive tension on the saw chain;
- use of substandard and surrogate chain oils.
Experts advise using a set of several chains, changing them as needed. This option can take advantage of the more productive mechanized sharpening.
Worn and damaged chains should be discarded promptly. Even with an emergency stop brake and a safety device, the operation of worn-out parts is characterized by an increased risk of injury.
How does the need for sharpening a chain appear??
Dull saw chain teeth significantly increase sawing time. The malfunction is manifested by increased vibration, reverse shocks when the headset enters the cut, the release of small chips and a clear smell of burnt wood.
With the help of a manual sharpening device installed on the headset, cylindrical and flat files, the cutting edge of the saw links is restored without removing the chain from the bar. Better and more productive way. finishing the chain in a specialized workshop.
This indicator of the chain is determined by the number of links. Leading manufacturers indicate in the accompanying documentation the chain length in inches or the number of links. When buying any model on your own, it is recommended to know both parameters.
Profile height, cutting depth and saw motor volume
Depending on the height of the cutting edge located above the plane of the guide bar, saw chains are distinguished into high- and low-profile. The former provide maximum productivity, while the latter have an increased bearing area of the cutting link, as a result of which they produce thin chips and are safer to work.
Depth of cut refers to the amount of clearance between the top of the cutter and the cut stop, which controls the thickness of the chips. Sawing sets with gaps of 0.025 ” and 0.03 ” are most in demand, while chains with a value of this parameter up to 0.07 ” are used as part of machine felling units. It is the depth of cut that determines the performance of the chain set. However, the larger it is, the more the saw will vibrate during operation. In order to balance the performance and vibrations on the chain with a large pitch, manufacturers install cutting teeth with a minimum depth and vice versa.
Saw engine capacity has a lot to do with the choice of the saw chain. If the latter is installed on a tool that is too powerful, it will be subject to increased loads and fail much earlier than the due date. Therefore, when buying a chain set, you should carefully study the technical characteristics of the saw itself.
Saw chain lubrication system
The reliability and efficiency of the chain saw directly depends on the quality of the chain and bar lubrication. In order to ensure the normal operation of the tool, manufacturers supply it with an oil pump, which supplies oil to the cutting system through special holes. The chain itself is responsible for the even distribution of the oil. its shanks, passing through the sprocket, capture the lubricant, which, as a result of the movement of the headset, spreads over it and the saw bar. Often, to increase the efficiency of lubrication, special channels are made in the driving links using a cutter or drill, and additional grooves in the connecting links.
The chain saw lubrication system works to reduce the damaging effect of friction and, of course, heating. This significantly increases the service life of both the chain attachment and the tool as a whole. Therefore, the user must control the lubrication process. If, when accelerating the chain, there is no oil trace on the mowing line of the cut, this means that the saw is overheating, and the chain itself can quickly become dull, or even burst altogether.
In order to increase the lubricating effect, world manufacturers produce organic-based saw oils. They cost a little more, but they provide a quarter less consumption, and when released into the environment, they self-degrade within a few hours.
Chains and tires with different parameters can be installed on modern chainsaws. However, before buying a new headset for a specific model, you should make sure that its lubrication system will cope with its functions during operation.
Saw chains are usually distinguished by:
- cutting direction (longitudinal and transverse);
- dimensions (length and size of the elements of the chain set);
- design features;
- the order of the cutting links.
Sawing wood along the grain causes more resistance than across. In view of the demand for both types of sawing, two types of saw chains are produced. longitudinal and transverse. They differ in the angle of attack of the incisors. As a result, when ripping, the performance of the saw increases, and when cross-cutting, the “aggressiveness” of the tool is smoothed out. Well, together with the latter, it reduces the level of vibrations and reduces the load on the engine.
For low quality requirements, ripping can be performed with a cross-chain saw.
Chainsaw tires on the market today come in a variety of sizes. One of the main parameters of the saw chain is the number of links, i.e. chain length. In addition, chain systems have a certain pitch. It is measured by the distance between three links in series, divided by two.
Saw chain classification by pitch
Depending on the pitch value, the saw chains differ in 5 classes:
Small pitch chains are fitted to single-handed chainsaws. Such a tool does not differ in power, however, it allows you to perform precise work, incl. in hard-to-reach places.
Chains with such pitch values are most widely used. Over 80% of the tools produced in the world are supplied with just such chain sets.
Large chain attachments fit large saws with increased productivity. felling systems, harvester equipment, etc.
Obviously, the larger the dimensions of the chain links, the more performance it has. It should be remembered that the cut will also be wider, which means that a large saw will be needed to overcome the resistance of wood to cutting.
Vibration and kickback when cutting
Neither the first nor the second can be avoided when working with a chainsaw, but you can reduce their intensity. Vibration in the saw chain is caused by the collision of the cutters with the wood. At the moment of contact of the cutting edge with the tree, it is sandwiched between it and the tire for a split second. Part of the shock energy is transmitted to the user’s hands through the headset, the drive sprocket and the saw body.
To reduce the effect of kickback due to vibrations when cutting wood, the following are used:
- beveled cut stop (provides a smooth movement of the chain due to the smooth sliding of the wood from the cutter);
- shock-absorbing protrusions on shanks and connectors (help to damp vibration when it is transmitted to the sprocket);
- beveled or raised heel of the cutter (ensures the chain subsidence at the moment of impact, which helps not only to damp vibration, but also to reduce wear on the chain set and the saw bar).
The use of these structural elements in the chain significantly reduces the risk of injury when the saw kicks back due to contact of the bar nose with a hard surface.
Saw chain design and care
The first hand-held chainsaws appeared in the 1920s. They were equipped with chains with straight and flat teeth. such a chain system was not very efficient and was very laborious to maintain. In 1947, Joseph Cox proposed a new type of chain. Its shape was L-shaped, due to which it was possible to multiply the performance of chainsaws, and ensure ease of sharpening. As a result, the Cox chain quickly ousted all its competitors from the market. Currently, most chainsaws are equipped with just such chain systems. they have a characteristic sickle-shaped cutting profile and allow you to work effectively with any type of wood.
The order of the cutting links
The list of the main parameters of the saw chains also contains the order of the cutting links. In the standard design, each cutter has a pair of shanks. In a chain with a half-pass, every third cutter is replaced by a leading link, and in headsets with a full pass, every second. Chains of the second and third types are not produced. they are made by a handicraft method from factory products.
Skip and half-skip headsets are significantly cheaper than standard ones, but they are inferior in performance, reliability and usability.
Shank thickness classification
The thickness of the driving links is the second most important chain parameter. It must match the size of the groove of the tire, along which the latter slides during operation. Due to this, the reliability of the fit is increased and the risk of its dismounting during operation is eliminated. The very same course of the chain is carried out smoothly, without unnecessary jerks and vibrations.
Global saw chain manufacturers produce 5 basic sizes of chain sets:
- 1.1 mm (miniature chains for mini saws);
- 1.3 mm (most in demand, because they are installed on household and semi-professional chainsaws);
- 1.5 mm (installed on saws of high power and performance);
- 1.6 and 2 mm (thick shank chains are used on professional and industrial saws).
Chainsaw chain pitch. Table
Taking into account the step size, at the moment the chains are divided into several subtypes:
|No.||Distance between rivets||Chain pitch (width in inches)|
As you can see from the table, the chain pitch is designated as a regular number (3/4) and decimal. “0.375”. This division is due to the similarity of the decimal values - “0.325” and “0.375”, since the difference of one digit created confusion when choosing a saw. Therefore, at one time it was decided to establish two different designations: decimal and ordinary fractions.
The pitch is stamped in the area of the special cut depth stop on each tooth.
The pluses of chains with a large pitch include:
- high level of productivity due to wide cut;
- the ability to perform complex work (felling large trees).
But it should be borne in mind that a wide cut requires the use of a more powerful motor, which in turn significantly increases resistance.
The advantages of small pitch chains are:
- low vibration;
- smooth movements when cutting;
- cleanliness of cut.
Benefits are achieved due to the large number of teeth and the small distance between them.
All known classification of circuits is based on the features of their marking, depending on the step, which is designed for certain needs and is produced for a specific power of electrical equipment. For a better understanding of each type of step, they should be considered separately.
Step and its dimensions
A step is an intermediate distance between three rivets that are next to each other. To correctly calculate the chain pitch, measure the distance between the axes of three rivets placed close to each other. In the form of a formula, it looks like this:
L = S / 2
Where, L is the step length, which in chainsaws characterizes the degree of remoteness of two teeth in relation to each other;
S. the value of the gap between the two extreme rivets of three.
The step size can also be equal to the length of the distance between two adjacent shanks.
Regularity: the greater the distance between the cutting teeth, the deeper they will enter the material being cut
By increasing the chain pitch, it becomes possible to increase the performance of the chainsaw. However, in such a case, the amount of force applied to rotate the drive sprocket changes. And the higher the chain pitch, the greater the power of the motors should be and the more physical forces are expended to pull it when cutting materials.
Chainsaw chain markers
In some situations, owners of chainsaws may have some confusion in understanding all the chain markings for these tools. As a result, this leads to 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 highlight the future capabilities of the tool, including its cutting speed, and also, according to the norms, should correspond to the level of engine power. How are chains marked? Let’s figure it out!
The main parameters of the chains
Applying the marking of the chain assumes the presence of the following parameters:
- “0.325” is the most common and minimum step size that is used in semi-professional and household chainsaws with low powers. The standard power value for such a step ranges from “0.325” to “3hp”, but not higher than “3.5hp”. When working with this type of chain, the sawing is smoother, more comfortable, without “gusts” of the processed products.
- “0.375” (“3/8”). applied to chainsaws with a capacity of “4hp”. This chain is used when sawing wood of medium and small thickness.
The accuracy and quality of the created cut depends on the value of the step. In cases where it is not important to achieve high quality when working with a chainsaw, the accuracy of the cut is sometimes of particular importance. To do this, it is imperative to take into account the dependence of the step for the release of wood according to pre-applied markings.
- The thickness of the leading links (tails). When the chainsaw is operating, its chain accounts for most of all loads. Considering this, another main characteristic of the saw is the thickness of the link elements that enter the grooves of the bar. This parameter also determines the overall thickness of the fastening links, which is measured with a standard caliper. Standard thicknesses include:
- “1.1 mm” (“0.043”) and “1.3 mm” (“0.05”) are used in the production of entry-level chains, which are designed to carry out small amounts of work. Often, with such values of the link thickness, the chain pitch length can be “0.325”, which implies the presence of low loads and a gentle mode of operation. Therefore, they are used in household and semi-professional devices;
- “1.5 mm” (“0.058”) is the most common thickness value on the market for chainsaws and accessories. This value is able to ensure safe operation with a step size of “3/8”. The 1.5mm chain is not suitable for professional cutting;
- “1.6 mm” (0.063) and “2.0 mm” (0.08). designed for the most difficult work. The metal in the manufacture of such chains is steel of special grades, and the characteristics of increased strength are laid in the design.
The greater the thickness of the link and the wider the groove of the tire, the higher quality the chainsaw is considered, since it is able to withstand heavy loads.
- Depth of cut is a distinctive feature of the produced chains and is characterized by the height of the profile of the cutting teeth. It is measured by the gap between the stops and the cutting top edge. Both high-profile (0.762 mm) and low-profile (0.635 mm) types of chain products can be presented on the market.
The higher the profile height, the higher the entry (depth) into the material and the cutting speed
High-profile chains are installed on chainsaws with increased engine power. Information about the height of the profile, as a rule, is written in the characteristic for the instrument.
The profile affects the occurrence of vibrations, which subsequently cause wear of the drive or problems when holding the tool in the hands. over, the higher the cutting parts, the stronger the vibration will be.
Household types of chainsaws are equipped with a low profile. In semi-professional devices, different variants of types of chains can be combined. However, in most cases, they adhere to the principle:
In a chain with a large pitch, a low profile is set, and with a pitch of “0.325”. a high
With such variations, the cutting speed increases not due to the step, but due to the change in the depth or height of the profile. Although in professional tools, the emphasis is on increasing the step, explaining this by the fact that the chainsaw becomes more controllable.
- Cutting tooth geometry. profile can be of two main types:
- chipper (popularly “sickle”). has a crescent shape and has a high performance. During operation, it is easier to sharpen and does not require strict sharpening angles. Disadvantage: risk of high loads and deterioration of cutting performance;
- chisel (popularly “seven”). has a straight working surface in the form of the number “7”. They are used in chains with a pitch of “0.404” or “3/8” on professional saws. The main disadvantage of chisel links is the difficulty of sharpening the cutting elements and sensitivity to dirt.
- The number of cutting teeth is defined as the ratio of the number of teeth to the number of rails in the tire. Chainsaws of good production should combine two guide links in the cutting part of the tool.
- The type of link sharpening. directly depends on the type of future work. Classic types of chainsaws are used mostly for cross-cutting trees and are rarely used for longitudinal sawing. Taking into account the resistance of the tree in both cases, the chains can use a different angle of the links. On construction counters, you can now find chains with the following types of cutting links:
- longitudinal type of chain. involves sawing a tree along its fibers. The cutting angle reaches 5-15 degrees.
- transverse type. the cut is carried out across. The cutting angle in the chains is 25-35 degrees.
- Chain length. depends on the parameters and technical characteristics of the chainsaw itself: power, dimensions, etc. With standard or normalized chain tension, its length is most often indicated in the passport.
- The order of the links. the sequence of the links can be different:
- standard. there are two driving links for each cutting link in the chain;
- with a half-pass. every third link in the chain in terms of placement is replaced by the so-called connecting link;
- with a pass. at the locations of every second link for cutting, a connecting.
Why skip links in a chain? In the chains themselves, the most valuable is the quality of the cutting links, since they are manufactured using special technologies and are more expensive than connecting links. If it is impossible to shorten the chain, the only option to reduce the cost of the chain is to skip cutting elements. In operation, chains with skipped links show reduced performance and wear quickly.
In general, if you want to purchase a tool for cutting wood with maximum efficiency, do not be too lazy to additionally study the marking of chains for chainsaws, which is also indicated in the instructions for the tool.
Rapid Micro Chain Series
The Rapid Micro range of chains includes about 10 types, each of which has an average of three versions with different characteristics of the pitch and width. The Rapid Micro series combines tooth shape and steel quality. They are recommended for use on Stihl chainsaws working in agriculture (semi-professional). Short designation RM.
3/8 ″ P Picco Micro Mini 3 (PMM3), 1.1mm
A distinctive feature is the narrowest cut possible. Abbreviation PMM3. It is recommended for entry-level chainsaws as well as pole and brush cutters. Has three versions:
- 3/8 ″ P Picco Micro Mini 3 (PMM3), 1.1mm (39);
- 3/8 ″ P Picco Micro Mini 3 (PMM3), 1.1mm (44);
- 3/8 ″ P Picco Micro Mini 3 (PMM3), 1.1mm (50).
Can be used on Stihl chainsaws MC 170, 180, 211, 230. Belongs to the comfort class, since it has minimal vibration and recoil.
Important: a chain with a width of 1.1 mm must be used with an appropriate bar, otherwise, it will dangle in the seat, which will lead to rapid wear of both the headset itself and the guide bar.
1/4 ″ Rapid Micro Spezial (RMS), 1.3mm
Designed specifically for shaped cuts in wood. A distinctive feature is the shortened upper edge of the tooth, thanks to which there is no need to press on the saw in order for the chain to cut into the wood. It is characterized by high speed and smoothness when making curved cuts compared to conventional chains with the same 1/4 ″ pitch. Available in two versions:
- 1/4 Rapid Micro Spezial, 1.3mm (56)
- 1/4 Rapid Micro Spezial 1.3mm (64).
Which chain is better than Stihl or Oregon
Choosing which chain is better, Stihl or Oregon is quite difficult, since they are almost the same in quality. The Oregon company, like Stihl, specializes in their production and invests in development, constantly improving and releasing new models.
When compared at the user level, Oregon is a little softer, they blunt faster, but they are easier to sharpen with a file. Shtilevsky. almost all hardened, metal is hard to sharpen, but keeps the edge a little longer.
Interesting. According to experts, the issue of the quality of the headset is relative. Many users first use used engine oil for lubrication, and then they say that this or that model and brand of chain is of poor quality, although the cause of premature wear lies in the metal shavings that are contained in any used oil, even that which had time to settle before filling.
3/8 ″ P Picco Micro 3 (PM3), 1.3mm
This model belongs to the comfort class, and is intended for professional use on light and compact chainsaws. The chain is characterized by high performance comparable to standard performance, while at the same time reduced kickback due to its low profile. There are several design options:
- 3/8 ″ P Picco Micro 3 (PM3), 1.3mm, 50 Links;
- 3/8 ″ P Picco Micro 3 (PM3) 1.3mm (51);
- 3/8 ″ P Picco Micro 3 (PM3) 1.3mm (55);
- 3/8 ″ P Picco Micro 3 (PM3) 1.3mm (56).
Stihl Chains Overview: Marking, Purpose
All Stihl chains are marked so that they can be identified and identified for which chainsaw models and types of work they are intended.
The name of the chain model must indicate its length (number of links), pitch and width. The type is also indicated. Type is an internal corporate designation, thanks to which the company’s specialists can determine the type and shape of the cutting tooth, the dimensions of the link and connecting elements. The designation can be complete, or it can be abbreviated in capital letters, for example, the Picco Micro 3 chain, abbreviated as PM3.
An ordinary user, in principle, does not need such information, since in order to choose the right headset, it is enough to know the characteristics of the chainsaw, the planned volume and types of work.
For the convenience of choosing, the Stihl website has an electronic consultant who automatically generates a list of chains suitable for a specific model of chainsaw.
The service is convenient and straightforward, but it has one big drawback, you can select chains only for Stihl chainsaws. If you have another chainsaw, then you will have to look for characteristics and name, which is not very convenient, since the list of models is quite large.
Below we offer you to watch a short, but interesting and informative video about Stihl chains, their production process and quality control.
Now we will consider specific models of Stihl chains, their marking, characteristics and purpose.
The reasons for the rupture of the saw headset
Sometimes, when using a chainsaw, the headset may break. This phenomenon is not common, but it happens from time to time. There may be several reasons, the first and the most common is severe wear. In the process of work, the edges rub against the tire, as a result, the metal is gradually erased and the chain, not withstanding the load, breaks.
Important! The use of high-quality adhesive oils can significantly extend the life of the saw headset.
The second reason is the untimely replacement of the drive sprocket and the guide bar or their replacement separately. According to the recommendations given by manufacturers, the saw headset, bar and drive sprocket should be replaced as a set. This will prevent wear, stretching and tearing due to increased stress.
Saw Chain Cutting Speed Comparison.
Third, this is a marriage when sharpening with a special sharpening machine. The disc of the machine rotates at high speeds and if the depth of the groove is set incorrectly or, for some reason, the working stroke of the machine increases, then a fraction of a second is enough to cut the edges of the connecting link. If, after sharpening, you do not check its quality and the presence of cut links, then during operation under load, the cut link may break.
Fourth and last, there is a defect in the rivets. A common cause of chain breaks is improper connection or re-use of connecting links. If your cutting attachment breaks, then information on how to connect the chain will be very useful.
Picco Micro (PM)
Low profile Stihl chain recommended by the manufacturer for use on lightweight chainsaws and delimbers. The peculiarity of the chain is a soft cut, with reduced recoil. It has four versions, which differ in the number of links. It:
- 3/8 ″ P Picco Micro (PM), 1.3mm (50);
- 3/8 ″ P Picco Micro (PM), 1.3 mm (51);
- 3/8 ″ P Picco Micro (PM) 1.3mm (55);
- 3/8 ″ P Picco Micro (PM) 1.3 mm (56).
This chain can be used on Stihl MS 180, 250 and. etc. Recommended retail. The specific price depends on the number of links. Also, the Stihl saw chain can be sold in coils of 50 and 100 meters, riveting can be done using a Stihl riveting machine or similar. Information on how to rivet correctly can be found on our website.
Existing step sizes
The chain pitch is a key parameter that requires special attention when choosing a cutting element for a chainsaw. It is measured in inches and is defined as the gap between the cutting links or the gap between the three rivets of the saw blade. The following image clearly illustrates how the chain pitch is determined.
Each saw has its own individual chain pitch.
It is worth noting that the pro tool works with any kind of chain.
Chains with a certain pitch are always designed for units of a certain power, taking into account the torque. Decreasing the pitch not only reduces the performance of the device, but also reduces the load on the motor. Conversely, with a large step, the productivity of the apparatus increases, but more power is required.
In addition, there is such a thing as the “aggressiveness” of the unit. In this case, we mean ease of management. The larger the step, the more force the teeth “tear” the wood. In addition, due to the large size of the cutting links, the kerf width also increases, which means that the operator will need to exert more effort to hold the device in his hands. Based on the foregoing, it is not worth using a chain with a large pitch on a low-power unit, since in this way the device can be rendered unusable.
Rip and cross saw chains the difference
The main difference is the angle of attack of the cutting links.
Rip chains are sharpened at a sharper angle (5. 15 degrees) than cross-cut chains. They are sharpened at an angle of 25. 35 degrees.
The chain is the key element of any chainsaw. The quality and speed of work when cutting wood depends on the type of cutting tool installed on the unit. For novice users of chainsaws, the choice of a saw chain seems to be a difficult process, since you need to know what types of a given part are, its characteristics, etc. This article will cover the main factors to consider in order to choose a good chainsaw chain.
Cutting depth and profile height
The depth of cut depends on how high the chain profile is. The higher the profile, the more the chain “bites” into the material, and as a result, the productivity of the tool increases. With a low profile, thinner chips are removed, and the chain is not immersed as deeply into the material. Usually, the depth is adjusted by sewing the stops that are located on each cutter.
The following profile sizes are available:
- high profile. 0.03 “(0.762 mm);
- low profile. 0.025 “(0.635 mm).
This information can be found in your chainsaw documentation. These types of profiles are installed on amateur and professional units. But you should be aware that a pro-class tool may not always be equipped with high-profile chains, and household tools are always equipped with low-profile cutting elements.
High-profile chains are the most productive elements, which means they have increased “aggressiveness” and, in addition, tangible vibration. The latter significantly reduces labor productivity, since it does not allow working with the unit for a long time. Therefore, manufacturers found a middle ground: with a large step, a chain with a low profile is made, and vice versa, if the step is less, then the profile is made high. These changes remove all side effects as much as possible, the unit starts to work with less “aggressiveness” and normal performance.
It’s hard to say which profiles are better. When choosing, you should always focus on the expected working conditions, hardness or toughness of wood, etc.
The sequence of the links
The sequence of links is varied. There are the following main types of sequences:
- Standard. All links are cutting, and connected by leading (this is the standard).
- With a half-pass. The cutting links alternately alternate with one connecting link, then with two.
- With a pass. In this case, the cutting links are separated from each other by two connecting.
To ensure a good cut, standard types of link sequences are used. The fewer cutting links, the lower the performance of the chain, and also the more likely it will wear out.
What are chains for chainsaws
When choosing a chain for a chainsaw, it is important to know what they are. They differ among themselves in a number of technical parameters that you need to pay attention to when buying. Many craftsmen buy products without relying on technical parameters, which ultimately leads to the fact that the saw starts to work even worse than with the previous chain.
It is important to know! If, after purchasing a new chain for a chainsaw, you notice that the tool has begun to behave even worse, then this may indicate the wrong choice of a cutting product.
Not many people know how to choose a chain for a chainsaw, since most home craftsmen look only at such an indicator as the cost of a product. When choosing, you need to pay attention to the technical characteristics, and especially, for which type of tool the product is purchased. After all, there are certain types of chains for a saw, which differ from products intended for gasoline files. Pay special attention to the following factors, which we will consider below.
When choosing a chain for a chainsaw, you need to know what distance should be between the centers of two adjacent rivets. This distance is called the chain pitch, which is one of the most important parameters of the product. To measure the step, you need to measure the distance between the first and third rivets, which are located in a row, that is, not on the bend, with a ruler, and divide it by two. By means of a step, it is possible to determine the size of the link, so the larger it is, the correspondingly higher the length and width of the link will be. The larger the step, the higher the product performance. But it is also important to take into account that a large step requires the application of significant efforts required to perform sawing work.
It is important to know! Chain pitch is closely related to tool power.
For chainsaws, products are produced with five types of steps. Pitch parameters are measured in inches, and direct values are indicated on the side of any device. The following step values can be found on devices:
Saws with chain pitch 0.25 and 0.75 are produced in small quantities. In household chainsaws, devices are used with a pitch of 0.325 and 0.375 inches, which depends in particular on the power of the tool. In tools from 5 HP products are used in increments of 0.404 inches. These products are primarily intended for use in professional saws. Some of the most common steps are 0.375 and 0.404 inches.
Saws with such a pitch are installed only on professional units with a power of at least 5.5 hp. With a saw with a pitch of 0.404 inches, you can cut trees of any thickness, and the units for this cutting element have a large torque, which greatly facilitates the work of a person.
It is important to know that the pitch of the chain always corresponds to the pitch of the sprockets, both driven and driven. It follows from this that if the documentation for the device indicates that it works with a chain with a pitch of 0.404, then you should not put the chain on the chainsaw with a pitch of 3/8. Before installing a chain with a different pitch, you need to purchase a complete kit, including both the bar and both sprockets: master and driven.
In addition to the above steps, there are two more: these are 1⁄4 (0.25) inch and 3⁄4 (0.75) inch. Saws with such a pitch are not very popular, both among professionals and DIYers.
The cutting tooth in most cases is made directly from high-alloy chrome-nickel steel. The teeth are not heat treated as they are intended for sharpening. When processing very hard or frozen wood materials, it is advisable to harden the teeth or purchase products with special solders on the teeth.