How to choose a chainsaw: tips on which chainsaw is best to choose for your home. How to choose a chainsaw - detailed instructions Chainsaws on how to choose the right one

The choice of electric saw is no exception. This tool, although inferior in power to its gasoline counterpart, has a number of undeniable advantages. A power saw is not suitable for large-scale work. But for owners of dachas and private houses, this is an indispensable assistant. We’ll talk about the types of saws and how to choose an electric saw for your dacha below.

The main criterion when choosing a saw should be your dacha. Why? The whole point is that it is the range of tasks that will influence the choice.

Types of power saws

The heart of our device is the electric motor. It is installed in two positions: along and across. The former, due to their design features, lengthen the electric saw. An engine located transversely, firstly, makes the device wider, and secondly, heavier. This is due to the inclusion of a gearbox in the design.

Electric saws are divided into:

  • chain;
  • disk;
  • saber

Chain ones are those whose working part is a chain with cutting elements. The edges of the chain are connected to form a ring. The cutting process occurs due to the rotation of the cutting element along the body along a guide (the so-called “tire”).

Before choosing a chain for an electric saw, you need to pay attention to its profile. Low profile chains have lower productivity than higher profile cutting tools. But the vibration in this case is lower, which means high operational safety. A video about choosing a chain saw will help you pay attention to the most important points:

Replaceable discs are used as the cutting element of the circular saw. They can be of different diameters and are designed for different materials.

If cutting with discs involves working with metal and stone, it is better to choose a tool with a cutting depth of 100 to 130 mm. The inconvenience is that such a tool weighs from 10 kg. Therefore, when choosing an electric saw, you need to look for a model with the possibility of permanent installation.

Reciprocating saws are also called electric hacksaws. They are very similar to chain tools. The difference is the installation of flat panels in such products. They move back and forth, resulting in cutting. The speed of the cutting part can reach 3 thousand movements per minute. This parameter will be one of the important ones when choosing a reciprocating electric saw. The tool is quite effective because its cost is high:

Differences between gasoline and electric saws

  • Ease of operation. An electric saw is much easier to work with than a gasoline saw. This is due to the fact that the power of the device is lower and the speed is lower;
  • mobility. Naturally, with the petrol version you will be able to move around much more freely;
  • efficiency. To use a chainsaw, we will have to buy not only oil, but also gasoline as a consumable. The electric analogue only needs a connection to the network or a battery;
  • weight. The power saw wins here. Because the power is less and there is no gasoline, our power tools are much more convenient to use and carry.

Disadvantages of electric saws

  • limited operating range due to power cord. Using an extension cord you can increase our working radius by several meters. But this cannot be compared with the ability to walk and work with a saw where we want. Although here too, electric saw manufacturers can help us by installing a battery in the tool. This, of course, will increase our mobility, but will also force us to monitor the charge, storage and operating conditions. Batteries do not like the cold and discharge very quickly when operating in a low temperature range;
  • working hours. The total operating time of the saw cannot exceed several hours a day. Moreover, the time of continuous activity is no more than a few minutes. This is due to the rapid overheating of working mechanisms;
  • strong dependence on the network. This is where we run into our biggest problem. On the one hand, the saw can become a problem - plugs fly out, wiring burns out. On the other hand, the network can cause the power tool to fail. This is due to the fact that either high or low voltage. Not to mention the power surge. All this leads to rapid wear of parts of the tool or, completely, to its unsuitability.

Advice ! When purchasing a powerful electric saw, make sure that the electrical network of your home or cottage can handle the power of the tool.

Criteria for choosing a chain saw

In this chapter we will talk about how to choose a chain saw and what criteria you need to pay attention to:

  • the most important criterion is engine power. It is this parameter that we will mainly have to build on. This is due to the fact that a more powerful model consumes more energy. We all know that the electrical network in rural areas, due to the unnecessaryness of large loads, is designed with low energy consumption in mind. As soon as you want to connect a powerful saw to such a network, you risk knocking out the plugs. This is the best case scenario. At worst, you will simply burn out all the wiring;
  • thermostat. As mentioned earlier, the continuous operation time of an electric saw is only a few minutes. This is due to overheating. To protect our instrument from overheating, we need a thermal relay. Therefore, before choosing an electric chain saw, take care of its availability;
  • price. It also depends on power. The more expensive it is, the more powerful it is. Although, there is one point here too. Electric saws with a motor located along the body are slightly more expensive than other arrangements. This is due to increased ease of use;
  • oil. Our future saw still has one tank. It is intended for lubricant. Basically, it comes into operation together with starting the engine, and our task is reduced to monitoring the oil level in the tank. The type of lubricant to be poured is indicated by the manufacturer in the instructions;
  • chain tension system. The cost of the device also depends on it. The state of tension must be constantly monitored. A flying part can injure or damage the power tool itself and the worker. Hence there are several types of tension mechanisms. In the simplest ones, we will have to remove the protective casing and use a nut to control the tension. Well, in more expensive models, this system is simplified and placed as a separate element on the external panel;
  • environmental friendliness. If you are a supporter of nature protection and environment, then an electric chain saw is definitely your choice. This is primarily due to the fact that it does not use gasoline and has no gas emissions into the atmosphere. Hence its advantage, which is worth considering when choosing an electric chain saw. You can work with such a saw in a confined space without fear of getting poisoned by exhaust gases. Well, as a nice bonus, it is several times quieter than its gasoline counterpart.

Advice ! When choosing a chain saw online, be sure to read reviews from previous customers.

Types of power saws for wood

Depending on what type of wood we have to work with, we can choose a power tool.

The most best assistant at the dacha when working with:

  • cutting branches and branches;
  • cutting wood;
  • small preparation of firewood for the winter;

handle it with a chain saw. For these types of work we will need a tool with a power of 1000 to 2000 watts. After reading reviews on how to choose an electric chain saw, you can understand in more detail the scope of its application.

For more accurate work (installation work, for example), a reciprocating electric saw is suitable for us. The length of its blade varies from 10 to 35 cm and allows you to work very comfortably with wood and laminate. This tool will be needed where you need to make curly or simply non-straight cuts in the material.

For the remaining tool (circular saw), we have the job of cutting chipboard sheets, pipes and metal sheets. There is a clarification here. For each material we need a specific disk, and the circular saw itself comes in two versions: manual and stationary.

Which brand of chain saw to choose

In this section we will talk specifically about which electric chain saw to choose.

There are several types of electric saws: professional, for personal use and so-called cordless ones. The latter are suitable for landscape work and are not intended for processing medium and thick wood. The Makita BUC122RFE model is considered the best for such types of work. Light weight and two batteries allow you to carry out decorating work comfortably.

Knowing how to choose a manufacturer of electric chain saws, you can narrow down the range of products you need. The manufacturer must have been on the market for a long time, have positive feedback from customers and develop in its field of activity.

For needs around the house and country house, as we have already said, the power of which varies between 1000-2000 W, excellent suitable model Bosch AKE 35. Its power is 1600 W, and the tire is 0.35 m. There is a system for convenient chain tensioning, in which we do not have to disassemble half of the electric saw. Well, the weight (4 kg) will pleasantly surprise you. Of course it's heavier garden tools but here good power which will become excellent choice electric saws for the garden.

The last type is professional chain saws. Here the leader is the Makita UC4030A. Its power is 2000 W, and the chain length is 0.4 m. This tool will allow you to comfortably deal with all wooden workpieces not only at home, but also in the country.

How to care for your electric chain saw

If you properly care for the tool, it does not require any effort during operation. To do this, we need to disassemble it every time after working with the saw. Remove foreign parts that have gotten into the device itself and are stuck in the circuit. If the saw does not have an automatic supply of lubricant for the cutting part, then it is imperative to lubricate it after cleaning.

Since ideally we take such tools for the dacha, we store them in unheated rooms. After such a long storage period, it is advisable to keep the saw in a warm room for about a day. This is necessary in order to protect the power tool from condensation formed. The gardening forum on how to choose a power saw does not always provide useful information on this topic. After all, each tool has its own storage specifics.

The electric chain saw is effective tool for cutting wood, requires less effort and time than hand saw. Unlike a chainsaw, it does not produce toxic exhaust. Therefore, they are used both in professional woodworking and in summer cottages. When choosing a saw, the main quality that is required from it is the ability to provide high performance over a long service life. The Marka.guru portal presents a rating of the best electric chain saws with the highest reliability for 2018.

To choose the right electric chain saw, it is recommended to evaluate models according to the following criteria:

  • Power. A more powerful and productive tool can cope with large diameter trunks and withstand high loads.
  • Engine location. Most models have a transverse design, which is convenient when working in vertical plane. The saw is larger and inconvenient in confined spaces. With a longitudinal position, better balance is achieved and more straight cut. In addition, better maneuverability is ensured.
  • Locking systems. Ensure safe operation of the device. Activate instant chain stop in case of a rebound, as well as protection against accidental activation.
  • Prevent overheating. When reached is unacceptable high temperatures the power supply is disconnected.
  • Soft start function. When starting the engine, the speed increases gradually, which extends the life of the device.
  • Adjusting chain tension. Impacts performance and safety. Changing the tension can be done using a screw and a screwdriver, or using a nut and a slider. The second method is simpler and does not require additional tools.
  • Lubrication. A good saw should have a chain lubrication system, which is a special pump that ensures uniform lubrication of the bar during operation.

1

The leader in the ranking of the best electric saws is the Makita model. Has a 40 cm tire and a chain of 56 links. Despite the transverse arrangement of the engine, it is comfortable and maneuverable, and has a rubberized handle. The chain tension is very easily adjusted with a special lever. There is an accidental activation lock and anti-rebound protection. The body design is balanced, the weight is not too heavy for instruments of this class. The noise and vibration produced correspond to modern European standards.

Technical indicators:

  • 1800 W;
  • chain pitch 9.3 mm;
  • 200ml oil tank;
  • 800 rpm;
  • cable 0.3 m;
  • 4.7 kg.

Advantages:

  • power;
  • ergonomics;
  • ease of setup;
  • relatively light weight.

Flaws:

  • requires regular maintenance.

The average price is 7500 rubles.

Prices :

2

In second place is a European-assembled electric saw from Bosch. Features a reliable transverse engine, robust housing and modern system blocking. According to the proprietary classification, it is suitable for medium-sized trees and moderately complex garden work.

The proprietary Bosch-SDS system allows you to adjust the tension and remove the chain with just one hand without the use of any additional tools.

Technical indicators:

  • 1800 W;
  • tire 40 cm;
  • 200ml oil tank;
  • chain speed 9 m/s;
  • weight 5.4 kg.

Advantages:

  • high-quality assembly;
  • reliable engine;
  • ergonomic handle;
  • safety of use.

Flaws:

  • sensitive to overheating, not intended for high loads.

The average price is 7800 rubles.

Prices :

3 Champion 420

In third place in the ranking of the best electric saws is the Champion model with a longitudinal engine. Ideal for work around the garden house, cutting building materials, cutting down small and medium-sized trees. Thanks to the longitudinal arrangement of the motor, the model is maneuverable, it is easy for it to trim branches and trim bushes. Operational safety is ensured by double insulation, switching lock and chain brake.

Thanks to the external location of the technical unit, you can easily change the motor carbon brushes without using special tools.

Technical indicators:

  • 2000 W;
  • tire 40 cm;
  • 101 dB;
  • 57 links;
  • 250ml oil tank;
  • 4.7 kg.

Advantages:

  • light weight and maneuverability;
  • high power;
  • safety.

No deficiencies were identified.

The average price is 5400 rubles.

Champion 420 prices:

4

The fourth place in the ranking is occupied by the Husqvarna cordless electric saw. There are configurations with and without a battery, and there is also a proprietary charger. The model is not sufficiently characterized high level noise, so it can be used near and even inside residential premises. The chain tension can be easily changed without the help of additional tools.

A distinctive feature of the model is its high battery performance. They work continuously for up to 45 minutes and charge in just half an hour. In addition, they are universal and fit any model of electric saw of the brand.

Technical indicators:

  • transverse brushless motor;
  • operating speed 15 m/s;
  • 200ml oil tank;
  • battery 3000 mAh;
  • 2.5 kg.

Advantages:

  • compactness;
  • a light weight;
  • wireless operation;
  • good performance.

Flaws:

  • high price.

The average price is 21,000 rubles.

Prices :

5

In the middle of the rating is a powerful Daewoo brand model with a transverse engine. It has a self-start locking system, a chain stop function and a durable shock-resistant housing. It is characterized by a low noise level and fairly light weight. The tension level can be changed without additional tools thanks to the SDS system.

A special window allows you to monitor the lubricant level in the oil reservoir in real time.

Technical indicators:

  • 2500 W;
  • tire 40 cm;
  • 230ml oil tank;
  • 57 links;
  • 6 kg.

Advantages:

  • high power;
  • does not heat up well;
  • simple mechanism for changing tension;
  • low price;
  • low level noise.

Flaws:

  • uncomfortable handles without soft pads.

The average price is 5400 rubles.

Prices :

6

The rating continues with the lightweight and compact DDE electric saw. Due to its low power, it is suitable for simple tasks such as trimming branches, trimming hedges, and preparing firewood. Eat standard set safe work, which includes an accidental start lock and a chain brake. The chain is automatically lubricated during operation.

Technical indicators:

  • 1820 W;
  • tire 35 cm;
  • 90ml oil tank;
  • 14 m/s;
  • 104 dB;
  • 4.4 kg.

Advantages:

  • quiet operation;
  • low cost;
  • good power;
  • a light weight.

Flaws:

  • noisy;
  • unreliable chain adjustment mechanism.

The average price is 4000 rubles.

Prices :

7

The Oleo-Mac electric saw can be used to cut hardwood and medium-sized branches. The brand is characterized by high reliability and ease of use. Operational safety is guaranteed by a double inertia brake, and the metal clutch increases service life and wear resistance.

Thanks to the ratcheting chain mechanism, the chain slips when jammed and provides additional protection for the electric motor.

Technical indicators:

  • transverse engine arrangement;
  • tire 40 cm;
  • 1800 kW;
  • 200ml oil tank;
  • 3.9 kg.

Advantages:

  • high power and speed;
  • durable and reliable motor;
  • durable body;
  • light weight.

Flaws:

  • inconvenient tension adjustment system.

The average price is 9500 rubles.

Prices :

8

The MasterYard electric saw has high power and a longitudinal arrangement of the electric motor. The small body allows you to work in inconvenient narrow spaces. The tool copes well with hard rocks and medium-sized branches. The metal stop, star and coupling guarantee long term service and high wear resistance. MasterYard has automatic system oil supply and overheating protection.

A special feature of the model is an electrodynamic engine brake with additional coils. The chain stops almost instantly after removing the start button.

Technical indicators:

  • 2000 W;
  • tire 40 cm;
  • 150ml oil tank;
  • 4.1 kg.

Advantages:

  • high performance;
  • reliability and wear resistance;
  • safety;
  • low noise level;
  • light weight.

No deficiencies were identified.

The average price is 9,000 rubles.

Prices :

9

In ninth place in the ranking of the best electric chain saws is another model from Oleo-Mac. Both models are very similar, but the 17 E-16 has less power and also has overheating protection. The saw is also characterized by its relatively light weight and dimensions, making it a good choice for the garden.

Technical indicators:

  • 1600 kW;
  • tire 40 cm;
  • 200ml oil tank;
  • 4 kg.

Advantages:

  • high reliability;
  • safety;
  • build quality;
  • good performance.

No deficiencies were identified.

The average price is 8500 rubles.

Prices :

10 Monferme 20237M-1

The TOP 10 is completed by the Monferme cordless electric saw. This lightweight, convenient and safe electric saw from the French brand is designed specifically for women. It is distinguished by its stylish bright design and ergonomics. The kit includes a rechargeable battery and charger. Oil tank has transparent walls, which allows you to constantly monitor the oil level. The handle and lock button have soft covering. The battery life is as much as 40 minutes.

The innovative DIGIPRO BRUSHLESS brushless motor produces 50% less vibration and 80% less noise than petrol models. In addition, it is 20% lighter and starts without problems at any time of the year.

Technical indicators:

  • battery 4000 mAh;
  • 200ml oil tank;
  • tire 40 cm;
  • 5.2 kg.

Advantages:

  • wireless operation;
  • bright design;
  • a light weight;
  • reliability and safety;
  • capacious battery.

Flaws:

  • high price.

The average price is 16,000 rubles.

Prices for Monferme 20237M-1:

Conclusion

When choosing a power saw, you must first of all be guided by the purpose of use. For simple gardening work, it is recommended to purchase more compact and lightweight models. For example, battery-powered ones, which do not depend on the ability to access electrical outlet. But they have a high price and are not suitable for large volumes of work. It is advisable to purchase a special extension cord for powerful, productive electric saws. For tree trimming, it is better to choose from models with a vertical motor, as they are characterized by good maneuverability. With a transverse arrangement, lower power losses and high performance are ensured.

Indispensable in construction work ah the instrument boasts a large assortment. It can be used to divide into parts various materials, which are used at all stages of construction and finishing of the house. However, before going to the market for useful device, you need to decide which chain saw will be better - electric or gasoline. To choose the appropriate option, it is not enough to focus only on those tools that are more powerful. It is necessary to take into account various criteria and study user reviews. Next, we will present the main types in detail and give our recommendations.

Operating principle of the chain device

Let's look at the design first. So, a chain saw consists of the following elements:

  • Engine;
  • Tire with chain.

Since the saw elements are removable (with replaceable heads), they are often called a headset. The saw part with sharpened teeth is closed into a ring, after which torque from the motor is supplied to it. After which it begins to move in the direction specified by the tire and perform sawing.

Types of chain devices

Saws can be classified into the following types:

  1. manual;
  2. battery;
  3. electrical;
  4. gasoline.

The modern market offers a wide range of chain saw models that can be used both at home and professionally.

Hand (pocket) saws include mechanical units that are extremely easy to use. To do this, you need to wrap a chain around the block or any other object that you plan to cut. Then, by setting it in motion manually, you can make a cut. This device also allows you to work with a partner.

Electrical units are equipped with a motor, which is connected to a bus and a chain through a transmission. One of the important elements of electric saws is the presence of a braking device that can stop the chain from working if necessary. The main difference from the previous type is that the electric motor operates using a cable. However, they are quite economical and do not consume much electricity. Also, among the advantages of the device are the low noise level and the absence of exhaust gases. That is, we can conclude that electric saws are applicable in enclosed spaces. Despite the ease of operation compared to gasoline units, they are inferior to them in terms of power and are not distinguished by mobility. Therefore, it is recommended to use them in small areas.

Advice. It is important to monitor the condition of the electric saw chain, since a dull product will force the unit to operate at higher speeds, which can negatively affect power. Since this will directly affect its performance, it is recommended to regularly grind the chain to sharpen its teeth. This can be done either with your own hands or using a special machine.

The structure of an electric chain saw using the example of one of the market models

Gasoline units are much less environmentally friendly, however, they are much more powerful. The safety of the device is ensured by the presence of an automatic clutch. Besides, in gasoline saws There is also a braking system that provides an instant stop in the event of force majeure (for example, a broken chain). The disadvantage of the device is the higher noise level compared to an electric saw, however, this is compensated by its mobility. You can use a saw virtually anywhere: from the forest. There are a whole lot of varieties of chainsaws, in particular, some are sharpened for cutting small trees, while others are capable of cutting even thick trunks.

Battery units are universal device powered by a charging battery. The electric motor is not distinguished by its power, but it has the same advantages as electric saws. They are also recommended for use in small areas.

Classification of chain saws depending on application

According to application conditions, devices can be classified as follows:

  • household;
  • semi-professional;
  • professional.

Let's start from the end. Professional devices naturally have good performance and are intended for everyday work. There is vibration protection and an ergonomic handle system. The cost of the unit is quite high, but its service life pays off all costs over time. They are used for work in the forest, etc. Characterized by its reliability.

Semi-professional (farm) units can also be used regularly, but the operating time is somewhat limited. Their performance compared to professional devices is significantly reduced, which leads to a reduction in cost. They are also used everywhere, both in gardens and on construction sites. The service life will depend on the quality of use and the total operating time.

For working at home or on garden plot It is best to pay attention to semi-professional and household chain saws

Household appliances cope excellently with their duties in a small area, since they have extremely simple design mechanics. The weight of the product is also small, which is due to the use budget materials. The cost of the device is affordable for all owners of garden plots.

How to choose a suitable device, which chain saw will be better

  • Depending on the required power rating of the device, during active construction, both an electric and a gasoline saw will be appropriate. The length of the tire must correspond to the declared power: in this case, a smaller value is welcome, since the longer length, the greater the load, as well as fuel consumption.
  • When purchasing gasoline saws, you should consider the availability of a spare saw set, which must be purchased only from the same manufacturer.
  • Do not forget that the performance of gasoline units is several times higher than that of electric units. Accordingly, they are used when it is necessary to ensure continuity of work in open space conditions. The lack of power grids does not affect them in any way.

Attention! The chainsaw load must be large enough, since operating the device at low speeds reduces the quality of its working system. The saw is designed for large volumes of work, but the power must correspond to its specifics.

  • If continuity of work on a construction site is not the goal, and the need to saw something arises only from time to time, then the choice should be made on electric units. With sufficient intensity, this device can be easily operated in a closed space, since there are no exhaust gases and the air remains clean. An electric saw is much more affordable in cost, so the more powerful the device you buy, the more satisfied you will be later. However, as this indicator increases, its dimensions will change accordingly.

Appearance of an electric saw using the example of one of the most common models on the market

  • When choosing a power saw, you should also pay attention to the position of the motor. It can be placed longitudinally or transversely. The first option looks better, as it provides more freedom of action. The universal tool allows you to work under different angle, therefore on at this moment It's not worth saving.
  • If possible, you should choose a device with a soft start, since the service life will depend on this.
  • When purchasing, be sure to pay attention to the presence of an automatic locking system and brake. It is also possible to purchase units with automatic feeding lubricants For this purpose, a special pump is installed on chain saws, operating simultaneously with the motor.

You need to choose a chain saw wisely and take into account all the details. Important There will be ergonomics of the device, ease of placement in the hand. Depending on the level of complexity of the work, its regularity and type, access to the electrical network, as well as the degree of openness of the space, you need to choose the type of chain saw that can ensure reliable, uninterrupted operation. According to the data stated in the technical data sheet, the price of the device will also be determined.

Video: How to choose a chain saw

Any owner country house You definitely have to deal with the need to carry out wood cutting operations. This is especially in demand when carrying out construction or repair work, which are usually always found in private households. If the house has stoves, then fuel supplies are constantly required. Plus, caring for the surrounding area: regular pruning of trees or complete cutting down of old, unnecessary trees, trimming of bushes and hedges, etc. Even organizing leisure time often requires turning to a saw - when it is necessary to prepare fuel for a barbecue or summer grill.

Using the “old-fashioned” approach using conventional and two-handed saws, an ax, and pruning shears is quite possible, but it takes a lot of time, which is usually not enough, and requires considerable physical effort. It’s good that in our time it is possible to purchase modern mechanized tools that greatly simplify the performance of labor-intensive operations. Thus, chainsaws are in great demand due to the ease of working with them and complete autonomy - independence from the presence of a power source. But in order for the tool to truly meet the expectations of its owner, you should definitely understand how to choose the right chainsaw, and what you should pay special attention to when purchasing.

Experienced users who have been using chainsaws in their daily work for a long time probably know the basic selection criteria. But for those who are just about to purchase this useful “assistant” for the first time, it’s worth starting with at least a little understanding of the structure of the chainsaw - so that it becomes clear what will be discussed when assessing the characteristics of the tool.

How does a chainsaw work?

The range of chain saws is very wide, as they are used in a variety of fields.

  • This is an indispensable tool both in companies engaged in industrial timber harvesting and in forestry enterprises that carry out regular work to clear areas of dead wood or unnecessary growth.

  • Chainsaws are used in the preparation of wooden parts of erected structures, cutting windows and doorways in log houses or beams, selecting the necessary grooves or tenons and for many other operations.

  • The variety of household and economic uses of a chainsaw has already been mentioned above - it is an indispensable assistant for a good homeowner.
  • Moreover, in the skillful hands of a master, a chainsaw becomes a tool for creating works of art - logs or logs turn into unique garden wooden sculptures.

But despite such a wide range of uses, everything chain saws They have approximately the same design and operate on the same principle.

First, let's look at the outside of the chainsaw:


The entire main structure of the saw is covered with a plastic or metal casing (item 1). Inside there is a power unit (engine) and components and mechanisms that ensure its startup and operation. At the top of the housing there is a removable cover (item 2), which, when removed, provides access to the power and ignition systems.

Any saw has two working handles. The front one is in the form of an arc encircling the top of the body (pos. 3), and the rear one (pos. 4), with control elements located on it.

In the front part of the chainsaw there is a bar (pos. 5), with a saw chain stretched on it (pos. 6).

To start the power unit, a manual starter is used, the handle of which is located on the left side of the housing (item 7). To pre-pump fuel into the carburetor, most models have a special hand pump button (item 8). Most often it is indicated by the “Primer” indicator.

Directly near the rear handle, so that you can easily reach it with your finger, there is a toggle switch for turning the engine ignition system on and off (item 9).

On the left side of the body there are always two filler necks - for refueling the saw (pos. 10) and for filling the tank for the chain and bar lubrication system (pos. 11). The necks are closed with sealed plugs. The location of the necks may differ from the example shown in the figure, but there are always inscriptions or pictograms that clearly indicate the purpose of the filling container.

Prices and model line of CALIBR chainsaws

chainsaw caliber

The engine speed is controlled by the throttle key (item 12), located on the rear handle of the saw. On top of the handle there is always one more key - a locking key (position 13), without pressing which it is impossible to transfer the control action to the throttle. This is one of the boundaries of ensuring safety at work.

A special safety shield (pos. 14) is always placed in front of the front handle, which is kinematically connected to the emergency chain brake.


On the opposite side of the chainsaw there is a metal or plastic casing (item 15) that covers the rotation transmission unit from the engine to the saw chain drive sprocket. There is also a mechanism for adjusting the chain tension, its lubrication, as well as two fastening nuts (item 16) that fix the installed position of the tire.

The internal combustion engine used in chainsaws is a single-cylinder, two-stroke. Its dimensions, respectively - the diameter of the cylinder and its volume, directly depend on the power and determine the purpose of the tool.


Two-stroke engines do not require a dedicated lubrication system. For normal operation mechanisms, it is enough to use a correctly selected gasoline-oil mixture as fuel. The gasoline component burns in the cylinder, and the oil component provides lubrication of friction units.

The engine cooling system is air. For greater heat transfer efficiency, the outer cylinder body is finned (item 1), and the engine flywheel has a unique turbine configuration with blades (item 5), which provide forced, powerful air flow.

Ignition working fuel mixture in the cylinder is carried out by a spark plug (item 2). The fuel supply from the carburetor to the cylinder is through a special connecting pipe (item 3). There must be a muffler (item 4), which reduces the noise level of the unit and directs the exhaust to the side.

There is no gearbox with a change in the number of revolutions from the engine to the drive sprocket - the rotation speed is regulated only by the throttle valve. But there is a clutch system (item 5) - torque is transmitted only when a certain speed level is reached.


This mechanism works by centrifugal principle. Clutch pads (their number can vary different models differ) are pulled to the center by a spring (item 2). The tie force is designed so that when idling, the pads do not contact the inner surface of the drum (item 3), which is rigidly connected to the chain drive sprocket (item 4), and rotation of the engine shaft (item 1) is not further transmitted.


As the number of revolutions increases, the massive pads, overcoming the resistance of the springs under the action of centrifugal force, are pressed against the inner surface of the drum, and the torque is transmitted to the saw chain.

The bar with the chain has a slot for insertion into the saw studs (item 6) and centering holes for a stopper (pin), the position of which can be changed with a special screw (item 5) - this is how the chain tension is adjusted.

Many models of chainsaws have a toothed chain catcher (pos. 7) located in the same area. In the event of a chain break or fall off, he must not allow injury to the worker’s hands.

The oil supply channel from the tank for lubrication of the chain and tire gears is also routed here through a screw pump. Many models are equipped with an adjusting screw with which you can change the flow rate.

The outer surface of the drum (item 3) also plays another function - it is part of the emergency chain braking mechanism.


When assembling the unit, the drum is surrounded by a spring-loaded ring made of steel strip (item 1). When the saw is not in working position, this belt is pressed against the drum by a spring. Before starting to use the tool, the technician presses the shield (item 2) back. In this position, the belt is loosened and the drum can rotate freely.

Why is this being done? A chainsaw is a high-risk tool, and the chain moving along the bar can cause serious injury. Particularly dangerous is the phenomenon of kickback - when the tire is thrown up or to the side. When the saw is in operation, the protective shield in the rear position is very close to the worker’s hand holding the tool by the front handle. In the event of a sudden kick of the saw upward or to the side, the back of the hand will involuntarily move the guard to the forward position, the spring-loaded belt will compress the drum, and its rotation will be stopped within 0.5 - 1 second, which means the movement of the chain will be interrupted. The engine remains running.

Diagram No. 3 shows a screw that changes the position of the pin when adjusting the chain tension.

True, the operation of such a brake requires special care from the technician. If you increase engine speed without moving the flap to the rear working position, then it is easy to overheat the mechanism and even cause melting of the polymer parts of the structure and failure of the entire mechanism. And working without a functioning chain brake is strictly prohibited.

To start the engine - transmitting starting torque to it, which will ensure the supply combustible mixture from the carburetor into the cylinder and will create an impulse for sparking at the spark plug, a manual starter is used.


The design of the starter is simple. This is a drum with a cable (cord) wound around it, which ends in a handle located outside. The drum itself is located on a frame that has a return spring - it ensures that the cable rewinds and the starter returns to its original position. The starter is located on the left of most models, coaxially with the engine crankshaft.

When the cord is sharply pulled, the drum is given a slight translational movement forward, so that its splines hit the mating protrusions of the engine flywheel, and a rotational movement is transmitted to the flywheel and then to the crankshaft.

Access for servicing the carburetor and spark plug is achieved by opening the top cover of the chainsaw.


Filter elements are also located here to clean the air entering the carburetor. They require regular monitoring and cleaning - clogged filters often cause unstable engine operation or even the impossibility of starting it.

Many models have another external control element - adjusting the carburetor air damper (among motorists the name “choke” usually appears). Such adjustment is sometimes necessary to facilitate cold starting of the engine before it warms up, especially in low winter temperatures.


Air damper control lever (“choke”)

There is a filter in the fuel tank that cleans the mixture from suspended matter. There is no fuel pump as such, except for the “primer” for preliminary manual pumping. Equalizing the pressure in the tank and outside (so that no vacuum is created during fuel production) is ensured by a special breather on the tank lid. Its condition also requires regular “keeping an eye”, since with a clogged breather the chainsaw engine will constantly stall.

The layout of specific models of chainsaws, especially - different manufacturers, may have certain differences. However, the basic scheme remains approximately the same for everyone.

For greater clarity of information about the design of a chainsaw, here is a demonstration video:

Video: structure and principle of operation of a chainsaw

What is assessed when choosing a chainsaw?

What tool evaluation criteria should you pay special attention to when purchasing a chainsaw?

Planned purpose of the tool

To begin with, you should realistically imagine how much work will be done with a chainsaw, and with what regularity. The choice of the required model primarily depends on this.

  • If there is a need to perform minor works with low frequency, for example, one-time preparation of firewood for a fireplace or barbecue, pruning trees, performing simple processing operations wooden blanks, then you can limit yourself to purchasing inexpensive model, belonging to the class of household chainsaws.

The smallest and lightest - household chainsaws (garden)

These tools are usually designed for very short periods of time. continuous work– within 20 ÷ 30 minutes, and in total no more than 1.5 ÷ 2 hours a day. But even in this mode, it is not recommended to exceed the threshold of 20 hours of use within a month. The engine life of the unit is small, usually within 400 hours of operation, and in order for the chainsaw to remain a “helper” for as long as possible, it requires appropriate, very rational use.

The power of the power unit of a household chainsaw usually does not exceed 1.5 kW, and the cylinder volume is about 40 cm³. Household-grade saws, as a rule, have a very effective muffler, which reduces the noise effect from their operation to the minimum possible.

With all these disadvantages, these chainsaws also have undeniable advantages. This is compactness and light weight. Such qualities allow almost everyone to use a household-grade tool, regardless of the person’s level of physical fitness.

  • The second class of chainsaws are semi-professional, or, as they are often called, “farm saws.”

An example of a semi-professional (“farmer”) chainsaw

This is already a fairly serious instrument that can withstand several hours of continuous use (about 4 hours a day). The power of the power unit reaches 2 ÷ 2.5 kW, the cylinder volume is up to 60 cm³.

Such a chainsaw is quite suitable for any household needs, including for regular preparation of firewood, felling small trees and sawing them into logs, for performing various construction operations. Most often, it is these saws that carpenters use when constructing log or. Such saws are also used in logging, but only to clear trunks of twigs and branches.

Prices and model line of ECHO chainsaws

chainsaw echo

The service life of such a chainsaw is usually about 1000 hours. For the “arsenal” of the owner of a country house who permanently resides in it, this is apparently the best option.

Of course, both the dimensions and weight of a chainsaw are already significantly higher than those of household-grade tools, and working with it will require a certain level of preparedness.

  • Finally, professional grade chainsaws. Their very name speaks for itself - they are designed for continuous operation during a work shift - up to eight or even more hours, under heavy loads.

Purchasing a professional-grade saw for the household seems completely unnecessary - there are simply no loads adequate for its capabilities.

These chainsaws always have a powerful power unit (3 kW) and higher, with a cylinder volume of 60 to 90 cm³), a long tire that allows you to work with thick trunks, an “aggressive” shape and sharpening of the chain teeth, capable of sawing dense wood even at high speeds. frost. The intended motor life is measured in thousands of hours.

A similar tool is used, as a rule, in logging sites. Using it for economic needs is both unprofitable and inconvenient. Chainsaws of this class are always massive and large, so they will not be good helpers in construction either. The operation of a saw is always accompanied by a fairly high noise level: in forest conditions this is not important, but for home use it is hardly suitable. In addition, working with professional tools requires very high physical fitness and appropriate qualifications of operators.

All other parameters for choosing a tool directly or indirectly depend on the chainsaw’s belonging to a particular class.

Types and parameters of tires and saw chains

Chainsaws are always equipped with standard tires. Their size (length) corresponds to the capabilities of the engine, and exceeding it is extremely dangerous - you can easily “kill” a drive that is not designed for excessively large loads.


The range of tire lengths is usually from 10 inches for household tools to 18 inches for farm tools (for professional ones, it can be much longer). For each specific model The manufacturer specifies acceptable sizes. The use of shorter tires is, in principle, possible, although not very encouraged. Installing longer ones that go beyond the upper limit of the range is strictly prohibited.

Some models of exactly the same power and design may be sold with tires of different lengths. Here you can focus on the nature of the intended work - for pruning trees and shrubs it is better to have a shorter tire, as it will be more convenient to work with, and for sawing firewood - a longer one, taking into account the diameter of the logs.

Tires may also differ in design.

  • Household and farm chainsaws usually have flat bars with low-profile chains - they are more convenient to use for unloaded cuts and are least susceptible to kickback. True, all this is due to reduced productivity.
  • For working at heights, it will be more convenient to use a lightweight tire. These are two metal plates with a polyamide gasket in the middle.
  • The tires of professional chainsaws usually provide the ability to replace the head with the end sprocket, since this unit wears out the fastest with constant use of the tool. For commercial use such a tire is not needed.

The main parameters of the tire are shown in the figure:


1 – the dimensions and position of the holes for fastenings and the guide adjusting cotter pin must correspond to the model of the chainsaw.

2 – the width of the guide groove, which ensures wedding movement, but at the same time, reliable retention of the chain on the bar. The size must correspond to the thickness of the chain tooth shank.

3 – the pitch of the end sprocket teeth must correspond to the same parameters of the drive sprocket and chain parameters.

4 – tire length (L), which was already mentioned above.

As a rule, the main parameters of the tire are not only indicated by the manufacturer in the passport, but also printed on the product itself:


Saw chain consists of the following elements:

1 and 2 – cutting chain links, alternately left and right, having a certain sharpening angle of the edges. Each of the cutting links has a protrusion - a cut depth limiter (item 3)

4 – driving links through which rotation from the sprocket is transmitted, and whose shanks hold the chain on the bar from lateral displacement.

5 – connecting links.

6 – rivets that assemble all the links into a single structure.

The main parameters of the circuit are shown in the diagram:


a is the value that determines the chain pitch, the distance between the first and third rivet, divided in half.

This value is standardized. In saws of small and medium power, that is, those belonging to the household and “farm” class, chains with a pitch of 0.325 and 3/8 inches are used (this corresponds in metric terms to 8.255 and 9.525 millimeters). Such a strange gradation at first glance, using decimals and simple fractions, was chosen only to prevent confusion: 3/8 of an inch is equal to 0.375, which can easily be confused with 0.325, and this way random discrepancies are excluded.

Chains with a pitch of 0.325 have the lowest vibration levels during operation, but their performance is also low. The “golden mean” is 3/8 inch; these are the chains found on most middle-class models. Professional chainsaws are equipped with chains with a pitch of 0.404, and sometimes even ¾ inches with a high tooth profile, often with special carbide tips.

The second parameter of the chain is the thickness of the drive link shank (indicated “b” in the diagram) - this value has already been discussed above.

And finally, the length of the chain, if this element of the saw set is purchased separately, must correspond to the size of the existing bar.

The shape of the cutting sections and their sharpening may vary from manufacturer to manufacturer. Thus, there are two main types of tooth shapes – chisel and chipper. However, there are many intermediate options.


However, such subtle knowledge is only interesting experienced craftsmen– at the everyday level the user will not feel much difference.

Another important note regarding the saw set. It is a common occurrence that chains and bars from one manufacturer are designed exclusively for chainsaws of the same brand. There are exceptions - but they are isolated and do not make a difference. Thus, when choosing a saw, you should immediately assess the availability of service or the availability in the region of the possibility of purchasing spare parts for this model.

Evaluating the ease of working with a chainsaw

It would be completely pointless to study technical and performance characteristics chainsaws, if you don’t “touch” it with your hands. This tool belongs to the high-risk group, so it is extremely important that the chainsaw fits perfectly into the master’s hand. And the owner himself must easily, without using excessive effort, direct the movement of the working saw bar.

To do this, when choosing, the ergonomics of a particular model must be assessed.

  • The chainsaw must be balanced - when fully assembled, its center of gravity must be positioned in such a way that when lifting the tool by the front handle, it maintains balance. This is very important - you won’t have to spend additional effort to hold the tool in a horizontal position, which means that fatigue from work will not set in so quickly.
  • The weight of the chainsaw is also assessed - people have different physical capabilities, and what seems easy to one may become an unbearable burden to another.

  • Be sure to evaluate the location of the safety shield in front of the front handle. It happens that in some household models the distance between the working position of the shield and the handle is very small. It will not be easy for a person with a strongly developed hand, and even wearing a work mitten, to hold the tool when cutting - any movement can cause an emergency brake operation. Naturally, efficient work in such conditions it will not happen - it will turn into complete torture, and may end in overheating of the brake drum. This means you will have to choose a larger model.
  • The comfort of the hand position on the rear control handle is assessed. Pressing the accelerator key after the safety key has been activated should be comfortable for your fingers, without jamming. The ignition circuit interrupt switch must be located within reach of instantaneous engine shutdown if such a need arises.

  • Even the smallest saw puts a considerable vibration load on the user’s hands during operation - this causes rapid fatigue, and with frequent use of the tool it can even lead to chronic joint diseases. Therefore, manufacturers try to minimize vibration impacts by using special elastic or spring dampers between the body and power block and, in particular, between the body and the front handle of the chainsaw. This point is also worth paying attention to.
  • When choosing a chainsaw, you should definitely ask the seller to refuel and start it. It is necessary to make sure that the engine starts easily, without problems, and idles smoothly, without failures. You should try the “throttle response” of the engine, that is, its adequate response to pressing the throttle control key. At the same time, it is possible to verify the normal operation of the clutch assembly (rotation should not be transmitted to the chain at idle) and the emergency brake (pressing the flap forward should stop the chain almost instantly).

When purchasing a saw, be sure to have it refueled and started - to check the correct operation of all components
  • When a chainsaw is running, you can evaluate the degree of its noise, as well as the direction of exhaust combustion products - this will subsequently be important for choosing a workplace and the position of the tool, taking into account the direction of the wind or the location of doors (gates, windows, ventilation hoods) in the workshop.

Which brand should you choose?

And finally, an important selection criterion is the manufacturer’s warranty, the possibility of service, the purchase of replacement headset elements and spare parts.

The undisputed leaders in the production of chainsaws are the companies STIHL and HUSQVARNA. The STIHL tool is more preferable from the point of view that in our area it is much easier to purchase a headset, consumables and spare parts for it. Products from MAKITA, JONSERED, OLEO MAC, HITACHI, ZENOAH, PARTNER, ECHO and a number of others enjoy unconditional authority. Among Russian buyers, chainsaws of the Taiga, Ural, Interskol, Zubr, and Energomash brands are quite popular.

Prices for popular chainsaws

Of course, you should only purchase a chainsaw in a specialized store, where the originality of the product will be guaranteed and all the manufacturer’s obligations will be confirmed. Unfortunately, we have to admit that in this area there are great amount fakes, outwardly practically indistinguishable from real models and identifying themselves only with individual “touches”. But in operation they have nothing in common with the original, neither in their effectiveness, nor in the built-in resource, nor in ensuring proper safety.

Video - How to choose the right chainsaw

And finally, here are a few popular models from leading chainsaw manufacturers:

ModelIllustrationShort descriptionPower, weightaverage price
HUSQVARNA 236 A small, lightweight, but powerful household-grade saw.
14" bar with 3/8" chain pitch and 1.3 mm groove width.
Tank volume – 0.3 l.
Additional centrifugal air cleaning system for carburetor		1400 W
4.6 kg		11500 rub.
Stihl MS 180 14 One of the most popular models for personal use.
The length of the bar is 14 inches, the chain pitch is 3/8, the groove width is 1.3 mm.
Automatic chain lubrication system.
Tank volume – 0.25 l.		1500 W
3.9 kg		13000 rub.
MAKITA EA3502S40B Chainsaw for household needs.
The length of the bar is 16 inches, the pitch and thickness of the chain is 3/8 - 1.3 mm.
Fuel tank volume – 0.4 l		1700 W
4.4 kg		16700 rub.
ECHO CS-510-15 A powerful saw of a semi-professional, “farm” class, Japanese assembled.
The length of the bar is 15 inches, the chain is 0.325 pitch and 1.5 mm wide.
Increased security system, economical consumption of fuel and oil due to light design features.
Improved anti-vibration protection.		2600 W
4.9 kg		28100 rub.
BISON PBC-450 40P Reliable and relatively inexpensive chainsaw domestic production, semi-professional class.
16" tire, chain parameters - 0.325 - 1.5 mm.
Tank volume – 0.55 l.
Electronic ignition system, air pre-purification system, saw set of our own design, designed for durability without sharpening.		1800 W
6.4 kg		12700 rub.
Hyundai X560 A semi-professional class chainsaw, with an extended bar, which allows you to fell fairly thick trees and use it for construction work with log cabins.
Bar length - 20', chain 0.325 - 1.5 mm.
Engine decompressor system, making it easier to start the unit.
Relatively low price against the backdrop of high performance characteristics		3000 W
5.2 kg		16500 rub.
Video - Guide to choosing a chainsaw

The question of buying a chain saw sooner or later arises for any owner of a private household, and usually this means an electric saw. Electric chainsaws are inferior to gasoline chainsaws in performance and autonomy, but significantly improve in ease of maintenance and use.

However, builders also often take an electric saw in addition to a gasoline saw - for small volumes of work it is more convenient, and working conditions sometimes do not allow the use of a chainsaw.

In stores today, the buyer is offered a wide range of models of electric saws in a wide range of prices and characteristics. To get the right tool for your money, you need to understand how each of these features affects the usability, performance, and safety of the saw.

Electric chain saw device

Despite the external diversity, all electric chain saws are designed the same way. The housing (1) houses an electric motor (2) that rotates the drive sprocket (3). The sprocket drives a toothed saw chain (4) running along a guide bar (5). On the rear handle (6) of the saw there is a power button (7), in front of the front handle (8) there is a protective shield (9), which is also an emergency brake. On the front of the body there is a row of stop teeth (10) that facilitate sawing.

Areas of application for electric chain saws

Chain Saw used wherever there is a large volume of sawing work:

Firewood procurement;

Carpentry;

Construction works;

Dismantling wooden buildings and designs.

Some people use a chain saw to trim the limbs, although it is better to use a reciprocating saw for this task - it is both more convenient and safer.

Characteristics of electric chain saws

The more power saw, the higher its productivity and the faster it will cut the same timber. But this does not mean that you should choose a saw that is as powerful as possible. Power saws are heavier and significantly more expensive, so choose a saw based on the task at hand.

If you plan to cut thick logs (30 cm or more in diameter), then you will need a saw with a long bar and a power of 2 kW or more.

If such tasks are not expected, a power of 1500 - 2000 W will be quite enough.

Saws with a power of less than 1500 W are only suitable for sawing small parts and trimming branches.

Engine location can be longitudinal and transverse. With a transverse arrangement, the drive sprocket is located directly on the engine axis - the design is simpler, more reliable and cheaper. But with this arrangement, the engine protrudes strongly to the side, which can lead to certain inconveniences - such a saw is more difficult to operate in cramped conditions. In addition, due to the uneven distribution of weight, it can be pulled to the side during operation.

Saws with a longitudinal arrangement do not have these disadvantages, but are more expensive.

Tire length determines the maximum cutting depth. The longer the tire, the thicker the log or timber can be cut. Of course, if the length of the bus is supported by the appropriate power.

Buying a saw famous manufacturer, you don’t have to think about it - a company that values ​​​​its reputation will not equip a low-power saw with a long bar. But if there are doubts about the correspondence between the length of the bus and the power, then you should be guided by the fact that the optimal power for a 40 cm bus is 2 kW, 35 cm is 1800 W. Saws with lower power are usually equipped with a 30 cm bar.

Bar groove width determines the thickness of the guide elements of the saw chain and characterizes the strength and wear resistance of the chain. For household saws not intended for high loads, saw chains with thin guides are used.

Chains experiencing high loads have thicker guide elements.

Chain pitch is called half the distance between any three rivets. The chain pitch determines the length of the chain teeth and affects the performance of the saw and the cleanliness of the cut.

The chain pitch must be matched to the engine power: a large pitch provides more performance, but requires more power. In addition, the larger the teeth (the larger the pitch), the rougher the cut, the stronger the vibration of the tool and the greater the adhesion of the chain to the material being cut - when wedging, such a chain is more likely to cause the tool to slip out of your hands.

Step in 1/4" (6.3 mm) ensures maximum accuracy and cleanliness of the cut and is used only in miniature saws.

Step 3/8" (9.3 mm) provides acceptable performance and is used in most household saws.

Step 0.375" (9.5 mm) used on powerful electric saws that require maximum performance.

Maximum chain speed affects the performance of the saw - the higher the speed, the faster it will cut. Of course, only if the engine power allows you to maintain high speed under load - choosing among saws with different speeds and power, the choice should be made according to power. The high speed of a low-power saw under load will be greatly reduced, and the advantage will disappear.

Chain tension mechanism. The saw chain stretches during operation, so that it does not start to fly off the bar; it must be tightened. On models with instrumental With a chain tensioning mechanism, this must be done using a separate tool, most often a screwdriver.

Toolless The mechanism allows you to tighten the chain manually by turning the tension regulator on the body.

Powering the device. There are also cordless chainsaws. They combine the simplicity, convenience and safety of using corded chain saws with the autonomy of gasoline ones. Unfortunately, cordless saws are much more expensive, have less power and a short operating time on one battery (20-40 minutes). In addition, with the same power, a cordless saw will be heavier.

When you decide to purchase a cordless saw, pay attention to the characteristics of the batteries: their voltage indirectly indicates the power of the saw (the higher the voltage, the more powerful), and the capacity indicates the duration of operation without charging.

Also note that most cordless saws are sold without a battery and charger, the price of which may be close to the cost of the saw itself.

Electric chain saw safety

A chain saw is a dangerous tool. Careless handling can result in serious injury or even death. Therefore, it is extremely important that the saw has all the options to ensure operator safety while working.

All electric saws are equipped with a chain brake lever that stops the chain when it hits your hand. But the manufacturing quality of this element may differ from one manufacturer to another. Before purchasing, you should check the operation of the chain brake - the lever should snap off with a slight force on it. Before starting work, be sure to ensure that releasing the lever causes the chain to stop immediately. The author of the guide personally observed a Chinese chainsaw, the release of the brake lever on which did not in any way affect its performance.

Blocking from accidental activation allows you to block the power button and guarantees that the tool will not turn on if the button is accidentally pressed.

Overrun brake stops the chain when the tool is turned off. If the saw does not have this option, after turning off the tool, the chain continues to move by inertia for some time - this may be enough to cause injury.

Anti-vibration reduces vibration load on hands and increases tool safety

Don't skimp on chain saw safety. If you buy a cheap screwdriver of dubious quality, in the worst case you will lose the money you paid for it. And in the case of a chain saw, excessive savings can lead to loss of health or life.

Choices

For cutting branches and cutting them into firewood trees will do lightweight, low-power chain saw.

For confident work with medium trees and for most construction work optimal choice there will be a saw of medium power with a 30-35 cm bar.

To cut thick logs you will need a powerful saw with a bar of 40 cm or more.