How to choose a chainsaw

Domestic saws - the most primitive. By their aid, usually resorted on occasion, such as when to procure wood for the fireplace. Functional abilities of the minimum drinking. Domestic saws - the most primitive. By their aid, usually resorted on occasion, such as when to procure wood for the fireplace. Functional abilities of the minimum drinking. They calculated an average of 20 hours of use per month (about 40 minutes a day), and their low power offset lightweight and easy to use. Semi-professional models perform any work - from construction and repair to the felling of trees. Their only drawback - the inability to use for 8-10 hours a day for a long period. Often they are Loppers as lumberjacks. Professional saws have a high capacity (as a rule, more than 2,5 kW) and are characterized by a wide range of functions. They are used mainly as Valenod drank, they worked tirelessly throughout the year for 10-16 hours a day. But the main feature of the professional tools - 8 hours without a break. These saws are made of durable and wear-resistant materials, and their share in the range 1300-2000 meter (for household model, this figure is 2-3 times lower). Resource work. Precise and clear definition of "service life", which would be equally operated with all manufacturers and retailers do not exist. The townsfolk treat it as a time to send the instrument to the dump, and specialists - like the time before the first engine overhaul or decrease the compression of 40%. As can be seen, the exact number to call is difficult or practically impossible, so the focus here is on the availability of firm service. The main advice manual chainsaw (as, indeed, any other instrument) is as follows: choose the right mode of operation and to avoid significant congestion. Formula of love right here: how to dispense with the instrument, so he serves. Cutting speed buying a chainsaw, buyers often ask about the rate of wood cutting tool for a specific brand (eg, whether to press him for it). This primarily depends on the state saw the headset, and in particular the chain. When working a dull chain sawing efficiency drops considerably, while probability of the blade failure increases as the load on the engine. Therefore, when a professional approach to the process recommended to regularly change the chain (for example, at the end of the day). In addition, a substantial contribution to productivity made by cutting the shape of the tooth and move the chain. The best results are achieved by optimum selection of the circuit and the engine power. Power saws - this is the second important parameter characterizing its activity and determines the harsh conditions of applicability of this model. The problem of the reverse shock most dangerous moment in the operation saw - the so-called kickback, or a sharp instrument in the garbage the operator. This happens when the end of the guide bar meets the surface of the treated wood. The only way to protect yourself from injury while - quick stop chain. This function performs a special brake (called inertial), the drive for which the mask is located in front of the left hand of the operator. He is a kind of lever that can occupy two positions. Before starting the flap switch in position "closer to the hand" and thus put to the platoon. At the time of the reverse stroke the hand of the operator runs into him, and mask works, instantly activating the chain brake. In addition, he can change position without interaction with the hand of the operator - simply due to inertia. Another way to avoid kickback - reduce the risk of the sector from the process of sawing. This is done by another panel (security sector), covering the end of saw sets and allows the tool to kick. However, resorting to this method is much less than to install the brake circuit. Moreover, the Swedish saw (Husqvarna, Jonsered, Partner) deliberately not fitted with such plates. The reason is that the Swedish security standards include the possibility of the end of the bus. Felling a tree logger-Swede is very similar to cutting a loaf of bread: the operator first bites into the wood end of the bus, and then makes a circle around the trunk. So you can blame the tree is twice thicker than the length of the bus. In Russia, such a method is allowed only high quality loggers. Vibration Control Prolonged contact with heavily vibrating tools can lead to serious diseases of the joints, so the presence of anti-vibration systems simply must, especially at the professional models. The simplest kind - a set of rubber pads placed between the arms and body. However, such an anti-vibration system is almost irrelevant - in modern chainsaws are usually implemented the principle of two masses: the engine block is separated from the unit handles and fuel tank. Anyone who has ever worked as a powerful saw for several hours, he knows what a huge burden experienced hands from vibration. In the absence of adequate vibration protection is fraught with blood circulation disorders and other unpleasant consequences. Therefore, if there is no desire, along with specialty and professional sawyer buy sickness, it should pay attention to what kind of protection against vibration for this system. Better yet, ask when buying a chainsaw and start holding it in your hands. Power and weight manufacturers avoid to increase capacity of domestic models, because it leads to weight gain tool. In addition, most power - not the most important factor when using the chainsaw in the household. Favorable ratio of weight - power is important for a professional, because this parameter affects the ease of operation and as a consequence, the quality of labor. In general, for a class of professional chainsaws nature of much greater spread of power (from 2 to 6 kW) than for the household. This is due to a variety of conditions in which the use of such tools (of varying thickness of the trunks of trees, hard or frozen wood, etc.). In Russia, a professional engaged in logging in the winter as in summer woods, usually impassable. Wood in winter and frozen solid, so the rolls should be chosen especially strong and durable chain saws. Types of tires There are several types of saw tires and chains, designed for different purposes and users. Saw headset for everyday drinking suit those users who take the tool from time to time and have no special skills. To best protect these operators, manufacturers establish a narrow flat tire with low-profile chain, which has a very low tendency to kickback. Lightweight tire works best for that particular role played by the weight of chain saws (for example, cutting at a height). These tires are made up of two steel plates with selected slots, the spaces between them filled polyamide. This design significantly reduces the weight of the tool. For professional use and prolonged use tires designed with interchangeable heads. They are placed on the blade of medium and high power. Bus length in the technical specifications chainsaw to the indicator bar length is usually added the word "recommended". What does this mean? The fact that the longer the tire, the more resistance it has angular momentum of the engine crankshaft. With insufficient power saws will make additional efforts that will lead to early amortization of saw sets and engine. In addition, since most of the power will go idle, increasing fuel consumption. Thus, the length of the bus must be consistent with a power saw and "recommended" means essentially the maximum (shorter bus can be set, but most - do not want). Chain of low-profile chain designed for non-professional use. As a rule, their pitch is 0.325 inches, so the main advantage of this circuit (the minimum level of vibration) gradually flows into its disadvantage - decreased productivity. On powerful chainsaws recommended circuit with a 3 / 8 and 0.404 inches. Vibration level they have increased, but the activity is much greater. It is these chains are optimal for felling and bucking of thick trees. There is also a special class of problems that conventional circuit is unable to cope (they blunt very quickly). This sawing contaminated or frozen wood. For such work, there are special carbide tipped chain. Why 3 / 8, rather than 0.375? Many more than once wondered what the chain pitch, and why he has such a strange notation: in one case - as a decimal fraction, and in another - simple. The answer is: theoretically, a step - the distance between two neighboring teeth, whereas virtually - the distance between rivets, chains, divided in half. Chain pitch is measured in inches and may be equal to 0.325, 0.375 and 0.404. As shown by international experience, users often confuse the numbers in the marking, as 0.375 and 0.325 differ only by one digit. To avoid such incidents, the producers decided to adhere to a common system of symbols, according to which step of the chain takes three values: 0.325, 3 / 8 and 0.404 inches. How to choose the guide headset should be remembered that the components of the saw sets (chain, tire, leading sprocket or star) of different companies, as a rule, are incompatible. The differences lie in the parameters of the leading sprocket (according to which there must be a step chain) and the thickness of the lead unit of the chain, which varies between 1,3-1,6 mm. Therefore, choosing a specific model, either an electric or a chainsaw, the buyer is almost always an admirer of completing the same brand. Many believe that the greater chain pitch, the more aggressive. In fact, everything is different. It turns out that the aggressiveness of the saw with a particular chain depends on the power and, consequently, torque. Power tool determines the ability of passing the chain saws sawing through. That's over this process is just beating the designers of many companies. As it turned out, for saws with small volume of the cylinder (and consequently with low power) circuit with a 3 / 8 inch set is unprofitable - for a wide step, the chain is stronger teeth bites into the wood, but the engine is not in a position to push through. Outcome - uneconomical work only part of the fabric. On the contrary, powerful saws, chain staffed 0.325 inches, just drag the chain, almost touching the tree. Was withdrawn following regularity. For saws with a cylinder capacity of 40-50 cubic centimeters efficient chain with step 0.325 inches, while more powerful machines will be optimum pitch 3 / 8 inches. In the category of 40-50 cubes are used both those and other chains - the choice is due to the specific features of the model. There is another category - the powerful saw with high torque (for example, domestic Ural-2TE). On such machines may be a chain with a step of 0.404 inches. Finally, we must not forget: changing the circuit to another with a different pitch, and the need to replace the sprocket. Requirements for gasoline and oil on any set saw a two-stroke petrol engines and two tanks (one - to fill the fuel mixture, the other - chain oil). Fuel tank capacity ranges from 0.3 to 1 liter, and the volume of oil, usually less than 1,5-2 times. This volume ratio leads to the fact that the chain oil and fuel mixture ends approximately at the same time, namely 30-45 minutes of operation (full load). The need for cooking fuel mixture is clear to anyone who is familiar with two-stroke engines: Unlike the two-stroke cycle engine of the four-stroke lead to the fact that for the lubrication of all moving parts (piston, shaft, etc.) can not apply the system of oil pumps and oil accounts for added directly to gasoline. All this is quite important, as when trying to run only on gasoline or a violation of the proportions of the mixture benzinomaslyanoy tool to quickly break down. Recommendations on brands of gasoline and oil, as well as the proportions of the fuel mixture as follows. For Russian chainsaws use the 76 th ordinary petrol and oil for two stroke engines (motorcycle oils) that add to the mixture in an amount of about 4%, ie in the proportion of 1 / 25. Foreign models require gasoline with an octane number of 92 (or higher) and branded lubricants manufacturers of chain saws (the oil content in the mixture should be about 1 / 40). In principle, domestic oil for two stroke engines are also suitable for foreign chainsaws, but we should bear in mind two things. First of all, to be sure that petrol is clean. Second: motorcycle oil designed for engines with speeds of up to 8,500 per minute, and because chainsaws foreign production speed can reach 11-14 thousand, and then applying these oils reduces the service life of tools by an average of 7-10%. So it worth it, will have to decide. From oil to lubricate the cutting equipment is simpler: all models of consumer and professional chain saws can be used conventional oils for Zhiguli (for example, models of Husqvarna recommended motor oil, and for Stihl - transmission). Should pay attention to the peculiarities of the seasonal operation of the instrument. If the saw operates at low temperatures, even if the correct choice of ingredients, the quality of oil and fuel mixture may be unsatisfactory (crystallization and significantly increases the viscosity). In this case, she saw to be adapted to such conditions - for example, to provide for heating the carburetor during operation. In addition, it is desirable to heat the first chain saw (if it was kept in an unheated room) to avoid unwanted effects due to the presence of condensate. Purchase and Maintenance When buying saw the natural desire of every customer - to test the tool. This seemingly simple process has pitfalls. All a matter of design features of chain saws. Note: any chainsaw can not run without pre-installed and adjusted the saw accessories (tires, sprockets and chains), or immediately flies out the clutch. So do not rush to pull a rope - it is better to carefully read the instructions. (By the way, if you import Saw came to our market through official channels, the statement must necessarily be in Russian.) After buying chainsaws should always obkatat it 40-50 minutes at low speed (this corresponds approximately to the development of the fuel tank), and then drown the engine and check chain tension. Next you need to make a few cuts, putting a weak effort, and only then proceed to use the full program. Were run for each new circuit (or bus) should be given a few minutes. All this is done to the asterisk, the tire and the chain is well warmed up and oil fell on all lubricated parts of the saw headset. Approximately 90% of cases the cause of exit saws down a careless attitude to the saw headset, and in particular the inadequate care of the chain. In other words, when the chain is sharpened, it does the job when blunted - a man. Everything else is an additional increased load on the engine. Besides the obvious inconvenience this increase in load leads to a significant reduction in service life instrument. How fast start saw after the mandatory test-launch saw the headset and fueling and oil saw ready to go. Next, you need to pull leak, completely pick up the slack starting rope and jerks run the tool (at great risk of sluggish pulling pour the candle, which is somewhat complicate the subsequent attempts to launch). If done correctly, the saw is put on the first try. rmnt.ru