bosch GKS 85 professional circular saw
Woodworking has always been and remains a very labor-intensive activity, and the appearance of a circular saw in the first half of the 20th century made it possible not only to facilitate wood cutting, but also to significantly increase labor productivity. As usual, after the actual invention of the cantilever woodworking machine, whose honor belongs to Raymond DeWalt, the principle was picked up by other equipment manufacturers who brought their own improvements. For example, Sullivan and Mitchell made a hand-held circular saw, A. Steele patented an integrated one, and A. Emmons a side drive of the cutting disc. And finally do "circular" The German company AEG succeeded in making it truly accessible to consumers by launching products designed for a 220 V household network. A modern circular saw is a fairly advanced device with a wide range of additional options, and there is nothing special to invent here. Manufacturers can only improve the quality of their products, bringing it closer to the quality of top models.
Working with a circular electric saw
The device of a modern circular saw is quite complicated in itself, since it combines high requirements for work safety and no less high requirements for the accuracy of settings, of which there are quite a few. Thus, it is categorically not recommended to carry out an independent repair of a circular saw due to the fact that it is impossible to achieve factory accuracy of adjustments in artisanal conditions, and this may adversely affect the accuracy, and most importantly, the safety of working with the tool.
A circular saw (also commonly referred to as a "circular" or "parquet") is mainly used for longitudinal cutting of wood and wood-based materials, including plywood, chipboard (chipboard), wood fiber (MDF), oriented strand (OSB) boards and MDF. In addition, the circular saw does an excellent job with cross cutting. However, when using special discs and changing the settings, the unit can also be used to cut laminate, sandwich panels, as well as various plastics (including plexiglass) and even slate. A circular saw can handle almost any sheet material, although there are limitations. Firstly, a circular saw can only cut in a straight line, which it holds perfectly. Secondly, the circular saw is not capable of sawing brick, concrete, plaster and other dense materials, although some models (for example, Makita 4101RH) are equipped with a diamond blade and a water supply system.
It is worth noting that a circular saw for cutting metal, in fact, is the most versatile device - if the unit is able to cope with metal, then softer materials are even more suitable for it. Unlike the usual angle grinders (angle grinders), or "grinders", which use an abrasive wheel, a metal circular saw uses a toothed disc made of special tool steel. A unit such as Makita 4131 easily cuts pipes, stainless steel, various profiles, not to mention sheet steel and non-ferrous metals and alloys. Compared to our traditional “grinders”, such a saw has many advantages, namely:
Circular saws for metal have long been successfully operated in Western Europe and the USA, while in our country they have appeared relatively recently. Naturally, domestic experts appreciated these devices. For example, the EVOLUTION 230 EXTREME circular saw can cut steel sheets up to 12 mm thick and steel profiles and pipes up to 4 mm wall thickness. Naturally, wood and various polymeric materials are also not a problem for her.
Plunge circular saw
This kind of circular saw is designed for making grooves, slots, grooves and other similar work. For example, it allows you to cut an opening in the countertop for installing a sink, since its design allows you to cut in anywhere, and not just from the edge of the material.
Plunge saw AEG TS 55 E
For example, the makita sp6000set model does not have a lower automatic guard, and the cutting disc is mounted above the base plate. When the machine is started, the wheel lowers and cuts. Cutting depth adjustment is accurate to the millimeter.
The submersible circular provides rich opportunities for repairing the floor, roofing and other works. Another feature of this type of saw is the ability to correctly cut multilayer and laminated materials. To avoid chipping on the decorative coating, cutting is carried out in two passes. The first pass cuts to a shallow depth. Cutting can be carried out both perpendicular to the plane of the material, and at a given angle.
Cordless circular saw
As battery technology advances, cordless saw blade models are becoming more and more competitive with traditional corded saw blades.
Makita hs300dwe cordless circular saw is a great choice
Moreover, the scope of cordless saws is quite wide.
Their use at height is especially important, for example, when installing or repairing a roof. The main problem with cordless saws was the short continuous operation time, since the power consumption is quite high, which means that a large capacity battery is needed, which affects the charging time. However, modern models (such as the Makita hs300dwe) equipped with two batteries are able to provide continuous operation - it takes 30 minutes to fully charge the battery. If we take the technical characteristics, namely power and torque, then models such as the Bosch GKS 36V-Li, which allows cutting up to 54 mm deep, are in no way inferior to traditional network models. And for the convenience of working with such a tool, it has no equal.
What to look for when choosing
Perhaps the main parameter of a circular saw is the diameter of the cutting disc, since it is he who ultimately determines the depth of cut, according to which the models are conditionally divided into classes. As the diameter of the disk increases, the power of the motor increases, and the design also becomes more complicated due to the fact that it is necessary to provide the necessary torque to maintain the speed within certain limits with increasing load. Also, the stabilization system becomes more complicated, which provides a low level of noise, vibration, beats and prevents jamming of the disk in the workpiece. All this leads to an increase in weight, dimensions and, accordingly, the cost of the unit. On the other hand, such a saw can cut more massive workpieces.
As for the classification, which is rather arbitrary, it depends on the diameter of the cutting wheel, but is still determined by the maximum depth of cut that the circular can make. This parameter is always indicated in the product data sheet, both for perpendicular and bevel saws. So, circular saws can be divided into the following classes:
- 40-50 mm - for working with sheet materials - household
- 50-65 mm - the most common class, suitable for most jobs
- 65-140 mm - professional models
As mentioned, the classification is very conditional. For example, one of the leading manufacturers of professional equipment, the Japanese company Makita, has its own classification, and does not produce models of the "light" class at all. It is worth noting that Makita brand circulars are a kind of standard in this (and not only) type of power tool. Thus, when choosing a model for personal use, one should be guided by necessity, namely the thickness and type of material with which to work. An important factor in the choice will be the maneuverability of the tool, which is the higher, the lower the power and, accordingly, the weight. For comparison, the Makita 5103R model with a disc diameter of 270 mm and an engine power of 2100 W has a mass of 9.4 kg and is capable of cutting at a depth of up to 100 mm, and the INTERSKOL DP-165/1200 model with a disc diameter of 165 mm and an engine power of 1200 W weighs 4.5 kg and is capable of cutting at a depth of up to 55 mm. When choosing, it should be borne in mind that in order to cut a thick workpiece, it is possible to cut from both sides, since it is not at all necessary that the cutting disc go through the material.
Makita 5103R Professional Powerful Circular
Circular saws are also classified by power. A more powerful motor will ensure stable operation, allow you to work continuously longer, which means faster cutting of the material. Naturally, the power and diameter of the cutting disc have a direct relationship, so the division into power classes is also quite arbitrary, namely:
- models up to 800 W can be classified as household
- models from 800 to 1200 W are universal
- models with a power of over 1200 W are considered professional.
The next selection criterion can be considered the speed (frequency) of disk rotation. To some extent, the cleanliness of the cut (no chipping) depends on the frequency of rotation, but it is also affected by the type of disc, namely the shape and size of the teeth. It is also worth considering that the higher the speed, the lower the value of the torque developed by the unit. And finally, speed affects the degree of heating of the workpiece, so high-speed models are not suitable for some plastics - the edges of the workpiece will simply begin to melt. Thus, you should pay attention to models with the same tool diameter and choose the rotation speed that best suits the nature of the work. On the other hand, there are models with adjustable disk rotation speed, but they will be correspondingly more expensive.
Electronic protection systems
A modern circular saw is equipped with various electronic systems that ensure the safety of the operator and extend the life of the unit itself. It should be borne in mind that the circular is a high-risk unit, so if possible, you should not save on your own safety. In addition, a more “advanced” model in terms of electronic systems is guaranteed to last longer, since electronic systems ensure the safety of the mechanical part from increased loads, shocks, etc.First of all, we should mention the so-called "constant electronics", which monitors the maintenance of a constant disk speed as the load increases or decreases. For example, the DeWalt DWS520K model has a special sensor that monitors the shaft speed and regulates the output power. Thus, a constant speed is achieved, and jamming of the disk in the workpiece is practically excluded. All this has a positive effect on the quality of the cut. Of course, in order to maintain the rotation speed when the load increases, the unit must have a certain power reserve, which is implemented in models of the middle and high class. Some models (for example, Metabo KSE 68 Plus) are equipped with an idle speed preset system, which may be necessary when sawing various materials. In this case, it will be precisely the preset frequency that will stabilize. However, many models without this option are also equipped with constant electronics.
As you know, the starting current of the electric motor is many times higher than the operating current, which can lead to an overload of the power grid. To prevent this phenomenon, many saw models are equipped with a soft start system. An additional positive factor in the presence of such a system is the reduction in the load on the mechanical part of the unit during start-up, the absence of a jerk and shock loads, which increases the durability of the unit, as well as the comfort of working with it. An example is the Fiolent PD 3-70E model.
Another useful option is overload protection of the tool. This may be the overzealousness of the operator, who puts excessive effort on the circular, or a sharp voltage drop in the network. At the same time, the protection system will automatically turn off the power, which will avoid the failure of the unit and save the owner money for its repair.
Finally, "advanced" models can be equipped with an electrodynamic brake. This system stops disc rotation almost instantly after the operator releases the power button, avoiding injury and protecting the machine and workpiece from damage.
Advanced Mechanics
One of the most unpleasant phenomena when working with a circular is the jamming of the disk in the workpiece. This can lead to engine failure, as well as kickback. The so-called slip clutch is designed to cope with this problem. If the disc sticks "tight", the clutch will free the motor shaft and allow it to rotate further to prevent burnout of the windings. This is a very reliable system, so it only works when needed.
A rather familiar mechanical element of protection against spontaneous or accidental activation is an additional button that must be pressed simultaneously with the main one. In many tools, such a button serves to lock the main switch in the working position. However, in the case of a circular saw, this method does not apply - turning off the power should always occur when the switch is released.
From time to time it is necessary to replace the cutting disc. To do this, fix the shaft and unscrew the fixing nut. Some models (Bosch GKS 65 CE Professional) are equipped with a shaft locking mechanism in any position. Also, the shaft can be fixed in one position or not fixed at all. In the latter case, two keys must be used to replace the disk, one of which must hold the shaft.
One of the most important parts of a circular saw is the base plate. It always contains various regulatory mechanisms and fastening elements for additional auxiliary parts. The base plate can be made from stamped steel of sufficient thickness or by casting, usually based on aluminum alloys. It is believed that a professional unit is always equipped with a cast base plate, however, some models (Bosch GKS 65 CE Professional) are equipped with a stamped base plate.
Changing the angle of inclination of the cut is carried out by changing the angle of inclination of the base plate relative to the disk. By default, the plate is perpendicular to the disk, and if necessary, it can be set at a fixed angle - 30°, 45°. There are models that allow a greater angle of inclination of the plate - up to 55 °. Also, the base plate contains elements for adjusting the depth of cut. The main requirement for a depth adjustment system is the accuracy and reliability of fixation. The ease of making the necessary changes is also important - for professional activities, time plays an important role.
Cutting boards with a circular saw
A good circular saw allows installation in a stationary position - a kind of machine comes out. Naturally, the heavier and more massive the unit, the more relevant such functionality will be, although many lightweight models also provide for this possibility.
Ensuring the straightness of the cut is of great importance. This can be achieved both by regular means (most saws are equipped with a stop to ensure parallelism with the edge of the material), and by additional equipment, which is purchased separately. However, it is often necessary to cut along the markup. To control the line in front of the base plate, a special opening is made. However, there are more modern solutions. For example, in the EVOLUTION 180 EXTREME device, a special laser pointer is installed, which is enough to be combined with the marking line.
Due to the increased danger of working with a circular saw, it is necessarily equipped with an automatic casing, which shifts at the start of work, and after cutting is completed, it automatically returns to its original, closed position under the influence of a spring. To prevent jamming of the disc during operation, any saw is equipped with a riving knife, which prevents the already cut material from squeezing the disc.
Ergonomic features of circular saws
Despite the fact that the circular saw is designed to facilitate the processing of wood and other materials, the process remains quite laborious. Therefore, the ergonomics of the unit when choosing is of paramount importance. And here special attention should be paid to the shape and location of the handles. Naturally, everyone should choose an instrument according to their own tastes, habits and physique. That is why there is a fairly large variety of shapes and arrangement of device controls. Particular attention is usually paid to the shape of the front handle - it can be straight, located perpendicular to the plane of the material being cut, or mushroom-shaped. The second option seems to be more preferable, since it gives more degrees of freedom. However, there are those who prefer the first option. Some manufacturers produce left-handed models. If we talk about the material of the handles, then rubberized ones have proven themselves best. They allow you to control the tool in the best possible way.
special overlay for width adjustment
When choosing a tool, you should consider several options, hold in your hands to feel their weight and balance. This is especially important for those who have to work a lot "in place" - in this case, the convenience of the tool is especially important. An important feature of a particular model is the visibility of the cutting site, depending on the design, it can vary significantly. When working with a saw, effective blowing of the cutting site must be organized to remove sawdust. Some models are equipped with a nozzle for attaching a vacuum cleaner and a bag for collecting sawdust. A special container may be provided for this.
Separately, you should pay attention to the location of the power cable, which, by negligence, can be cut. The most preferred rear arrangement with a long and rigid inlet sleeve. As for the length of the cord, it is better if it is long (3-4 m) - during operation, the carrying block can create noticeable interference.
The saw motor has parts that are subject to periodic replacement - brushes. You should choose models that provide quick access to the brushes. In this case, you can replace them yourself. Otherwise, it may be necessary to contact the service center, and this is an additional cost of time and money.
In the store, it is unlikely that you will be able to test the tool in action, but you must run it and listen to how noisy it is, how strong the vibration is. Several models should be compared according to these indicators. The circular motor is cooled by the air flow that is generated when the disk rotates. The stronger it is, the better the cooling will be. Also, the air flow blows away the resulting sawdust.
Videos circular saw
If the circular is supposed to be used periodically, for small jobs, you should pay attention to the “hobby” class tool, which is in the assortment of many well-known brands (for example, Bosch PKS 55 A or Black & Decker CD601). The mode of operation of these models requires a 15-minute break after 15 minutes of continuous operation, and such a saw should work no more than 4 hours per day. But the cost will be much lower, and the warranty will be even longer than for a professional tool (2-3 years versus 1 for a "pro"). It is worth noting that a professional tool, due to intensive use, often really lasts a shorter period than a household one, so if the price is not the main thing.
As for the brands that have proven themselves from the best side, then for household needs you should pay attention to the products of Black & Decker, Skil, Bosch (green) companies and saw prices are acceptable. If it is to be used in professional activities, then the models of the Japanese companies Makita and Hitachi, as well as the blue Bosch, are out of competition.
Today we will take a closer look at the main types of circular saws. Let's define reasonable criteria for choosing a particular model. We will draw conclusions for recommendations based on the experience of practicing builders and employees of service centers. Join.
Electric circular saw (popularly "circular", "parquet") appeared in the twenties of the last century. As usual, several "organizations" have worked hard. At first, a radial-cantilever type of wood cutting machine was developed (Raymond DeWalt), a little later, manual models began to be produced under the Skilsaw brand (Salivan and Mitchell). There were also separate patents for saws with side and integrated drive in the name of A. Emmons and A. Steele, respectively. Well, the AEG company helped to “ground” the invention and promote it to the masses, whose engineers were the first to connect the instrument to a common 220 volt network. Nowadays, the circular saw has reached perfection, the set of options and auxiliary systems for it has not changed for a very long time, not to mention the design features. It's just that everyone is slowly moving towards the premium class.
The circular is considered one of the most technically complex instruments, and that's not even considering that it can have a full set of electronic bells and whistles available. The fact is that here it is necessary to constructively provide unprecedented security measures (like all disk machines, “parquets” can be very traumatic), as well as to realize the high accuracy of many spatial mechanical settings. Self-repair of a circular is considered to be a risky undertaking due to the difficulty of restoring the correct factory settings.
The main purpose of the circular saw is to perform longitudinal cutting of wood and its derivatives (OSB, chipboard, fiberboard, MDF, plywood), because this tool holds the line perfectly, the jigsaw cannot be compared here. Naturally, cross cutting for a circular saw will also not be a problem. But it would be strange if a modern cutting unit would not be sharpened to work on other materials. Indeed, using various types of discs, and in some cases changing the shaft speed, it is possible to cut laminated blanks, GVL, plastic of various densities, multilayer materials (sandwiches), slate, plexiglass. In a word, almost all sheet panels are perfectly cut, including at an angle to the main plane. The only thing that the circular is too tough for is dense mineral materials (concrete, brick, plaster). True, some units can be equipped with a diamond blade and have a water supply; structurally, these are full-fledged circulars (Makita 4101RH). There is still one iron “but” - a circular saw cannot cut along a curved line.
What is a metal circular
Separately, it is worth highlighting circular saws for working on metal. Although they are positioned in the market in this way, they are essentially multifunctional. It's more about the characteristics of the standard wheel, which comes as standard (this is not an abrasive, it is a hard-alloy toothed multi-purpose disk). Such units easily deal with pipes, tin, complex profiles, sheet steel and stainless steel (Makita 4131). The conversation is very simple with both steel and soft non-ferrous alloys (based on copper, aluminum).
But what about USM? Compared with grinders, equipped with a cutting wheel, we have the following:
- Productivity is much higher.
- The operator is unloaded as the machine rests on the sole.
- The level of noise and vibration is reduced.
- Work "on a bevel" is possible.
- There are no sparks, the workpiece almost does not heat up and does not “burn out”.
- Improved security (rigging is almost completely hidden and not subject to tearing).
- The resource of a carbide disc is about 100 times higher than that of an abrasive.
- The cut price is the lowest (only the guillotine is cheaper and faster).
- There is no release of mineral dust into the air, as from stone equipment.
- The cut is very high quality, without burrs.
Our masters have just tried this device, and in Europe and the USA such machines are in full use, quite naturally, with such and such pluses. For example, the EVOLUTION 230 XTREME cuts sheet steel (class A-3) with a thickness of 12 mm, profiles / pipes with a wall of 4 mm, and, of course, everything else (wood, polymers).
Plunge circular saw
Another class of circulars is a plunge-cut saw. It is designed to plunge into the workpiece anywhere, not just from the edge. Here, the lower automatic casing is completely absent, and the disc is located above the base plate and lowers only when the “start” button is pressed. Naturally, the cutting depth is adjustable, and often within a range of a few millimeters (DWS520K).
A submersible mechanism (something similar is implemented in wall chasers) allows you to make local repairs to the roof, dismantle several selective floorboards, and cut an opening in the countertop. Without much difficulty, you can make grooves, slots, gutters. For correct work with sandwiches and laminated materials, the top layer can be cut with a preliminary pass to an incomplete depth of the workpiece, thereby eliminating the risk of chipping. All this is done not only perpendicular to the plane of the part, but also under a variable slope.
Cordless circular saw
More recently, such units seemed to us a real fantasy. But as time goes by, wireless technology is reaching a new level. Batteries have become so capacious, special motors have become so economical, and chargers have become so fast that even for such a powerful tool as a circular, the developers managed to organize an uninterrupted power supply. We take two modern batteries and a half-hour charge - that's it, there will be no problems with energy (Makita BSS 610 RFE). It's even easier if your circular saw is equipped with a standardized battery from the same manufacturer as the rest of your tools. The power characteristics (output power, torque) of wireless circulars are no longer inferior to those of similar network machines - Bosch GKS 18 V-Li (cutting depth 51 mm). Well, as for mobility and ergonomics, then here they are beyond any competition, they are especially loved by roofing operatives working at height.
Main selection criteria
Power, speed, blade diameter, cutting depth
The diameter of the cutting disc (outer, not the size of the mounting hole) - it can be said without exaggeration that this is the main parameter of the circular. Based on it, manufacturers are forced to assemble a specific model. The larger the disc, the more powerful the motor must be in order to spin it up to the desired speed, the more torque is required to maintain this speed and there is no jamming, the more technologically advanced the stabilization system should be, so that there is no beating, vibration and noise, the harder , larger, the saw will be more expensive. But on the other hand, large equipment allows you to cut more massive workpieces, material of greater thickness.
However, it is not enough just to pay attention to the size of the circle, it is much more important to have an accurate idea of \u200b\u200bthe maximum depth of cut. Developers almost always indicate these parameters in passports, both for perpendicular and beveled cuts. There is some conditional division:
- Light class (40-50 mm) - sheet materials, work "in place".
- The middle class (50-65 mm) is the most common, universal.
- The heavy class (65-140 mm) are massive, purely professional machines.
The conventionality is that many companies issue their own special classification (Makitovites, for example, do not let out babies at all and move a little forward in this matter). It turns out that we, ordinary users, can only listen to our needs, choose a priority in the ratio of "maneuverability / versatility / strength", based on the specifics of the intended work. For example, Hitachi C13U (weight 13 kg, disk 335 mm, 2000 watts) and Hitachi C6MFA (weight 3.4 kg, disk 165 mm, 1010 watts). The straight cut depth ratio for these models is 128 mm to 57 mm respectively.
Left: Hitachi C13U, Right: Hitachi C6MFA
I would also like to note that in case of emergency, you can cut a very voluminous part by making a cut on both sides (yes, for correct operation, the disk does not have to pass through the workpiece through and through).
What else gives power reserve? If there is a need to compare two circulars with the same depth, then a stronger motor of one of them will provide better frequency stability, longer continuous operation time, and will allow faster cutting of denser material. Watts under the hood are traditionally correlated with the diameter of the equipment and, again conditionally, the units are credited to one of the three corresponding classes:
- Up to 800W.
- From 800 to 1200 watts.
- More than 1200 W (for example, Hitachi C9U2 - 2 kW, Makita 5143R - 2.2 kW).
The speed of rotation of the disk - what does it give, besides the speed itself? There are two main nuances. First, the faster the shaft moves, the cleaner the cut is (although the purity depends more on the type of disc - the number and shape of the teeth). Second, high speed is the opposite of torque. Thirdly, high speed is high temperature, and some plastics may start to melt during sawing. If the frequency has become a stumbling block (read "choice"), then you need to compare saws with the same diameter of the cutting disc. Even better, find a model with adjustable idle speed.
Electronics on guard
Advanced circulars are stuffed with electronic systems to the eyeballs. This is quite predictable, since this tool is powerful and dangerous - the user needs help so that the mission is not impossible. If there is a financial opportunity, you should not give up additional options; there are no unnecessary trifles for performance and safety.
For the benefit of the correct speed mode, a system for maintaining a constant spindle speed under load, the so-called constant electronics (DeWalt DWS520K), is working. A special controller constantly reads the speed and in case of a local drop in speed (for example, when the feed is accelerated or when the equipment hits a compacted area of the material), it is stabilized by an automatic increase in outgoing power. The probability of disc jamming is reduced to almost zero, but the quality of the cut is only improving. Obviously, this requires a certain power reserve (this is the prerogative of relatively large machines). Another point is the idle speed adjustment, presetting. It is needed for manual selection of process parameters for materials with different physical characteristics (Metabo KSE 68 Plus). Not all models can boast of such an option. And, by the way, the possibility of presetting is not a prerequisite for the presence of constant electronics; the only available frequency can also stabilize.
In order not to overload the network when the tool is turned on, since the starting currents, albeit in a short period of time, significantly exceed their nominal value, almost all more or less powerful circulars have a soft start system. The equipment does not accelerate immediately, which eliminates the jerk of the tool and saves the parts of the gearbox from unnecessary shock loads, the unit lives much longer (Fiolent PD 3-70E).
If the operator is in a hurry to complete what he started and does not listen to the “well-being” of the saw blade, then the overload protection system will receive a signal from overheated motor windings or react to a sharp drop in power consumption and turn off the power, while maintaining the performance of an expensive tool.
The electrodynamic brake stops the disc abruptly after the start key is released (AEG BKS 18). The system is designed to protect the operator from possible injury, the part from damage, and the machine from kickback.
Mechanical features
With a dull jamming of the equipment, the motor can fail very quickly, there is a possibility of a kickback. To protect against such a nuisance, a slip clutch is used. The working shaft of the motor will continue to rotate even when the disk is stationary. Do not worry, the system does not work unnecessarily.
Protection against accidental activation is implemented by installing an additional button in the area of the main handle. To apply power to the motor, it must be pressed simultaneously with the start key (Skil 5064AA). To make such a chord unintentionally, perhaps, is impossible at all, especially since the "fuse" is usually recessed into the plastic. Often (for other instruments) this button allows you to fix the trigger on, this will not work here - the toothed disk should always be under control.
For the convenience of replacing the disk, the spindle can be locked with a button or lever, in some models literally in any position (no need to scroll to look for a setting point - Bosch GKS 65 CE Professional). If there is no lock, you have to wield two keys at once. The nut itself can be tightened with a wrench / screwdriver, or it is performed in a “toolless” version - quick-clamping.
A lot of the functionality of the circular depends on its base plate. Note that it is on it that all mechanical adjustments and fastenings for auxiliary elements are installed. Traditionally, platforms made by casting light alloys are considered to be of higher quality. They clearly indicate the professional class of the instrument, as they retain their geometry well (Interskol DP-235/2000M). However, thick stamped steel pads should not be discounted. They are more resistant to impact loads (they do not crack from accidental impact), affect the price of the product to a lesser extent, and are also used in professional tools (Bosch GKS 65 CE Professional).
Interskol DP-235/2000M
An important point is the adjustment of the bevel cut. Sawing at an angle is realized precisely by changing the position of the platform relative to the entire upper part and the disk in particular. Usually the slope is set at different angles: 30°, 45°, and in some machines it is extended to 50-55°. There is also a mechanism for setting the depth of cut. As a rule, this is all done in the form of grooves shaped like a quarter of a circle (in some cases graduated) and rods with wing/lever clamps. The main advantage of quality control elements is the speed, reliability and accuracy of fixation (Kress 1400 HKS). Backlash here is extremely unwanted guests.
Another advantage of the thoughtful platform is the ability to install the saw in a stationary position. This refers to the option of creating a machine without using a special table. This moment will be relevant for all machines, but even more so for especially powerful and heavy ones.
To perform a high-quality straight cut, circular saws are already equipped with a parallel stop in the basic configuration, by the way, it can also be light-alloy. However, the greatest accuracy of sawing work can be achieved using a guide bar. The tire is bought separately (they often fit from other manufacturers), but the sole must have a special groove. If you need to work "by hand" on the markup, you need to control the line; for this, a special slot is made in front of the base plate. An interesting option is implemented in the EVOLUTION 180 XTREME saw, where a laser line builder is built into the handle, during operation you only need to combine it with the markings.
A mandatory accessory for a circular saw is a spring-loaded casing that completely hides the disc, releasing it only at the start of sawing (you need an emphasis on the workpiece). The cover should move easily and always return to its original position. To prevent the disk from being squeezed from the sides by already cut material and not to stop, a “riving knife” is used in the design.
Ergonomics and more
The circular is a manual tool, so when choosing, special attention should be paid to the overall ergonomics of the product. Interestingly, some manufacturers even produce a tool for left-handers, with a mirror layout.
The most important role in the comfort of any circular is given to the shape and location of the handles. Obviously, each user will have their own requirements. Most of the questions are raised by the front handle, which is most often straight, located perpendicular to the plane of movement of the saw blade. This design is good if you work forward, but most often the tool is carried from the side - so most craftsmen prefer the mushroom version, which is easily held in any position (DeWalt D23620). For some, a bracket-like design (DeWalt D23650K) may be more suitable.
Give preference to models with rubberized handles, they help to securely hold and control the tool during operation.
It will not be superfluous to hold several circulars in your hands before buying, most likely, a lot will become clear to you regarding the weight distribution of specific machines and their balance. Be sure to do this if you plan to do a lot of work "in place".
Evaluate the visibility of the working area, the specific design features of the circular saw very seriously affect this circumstance. It is also important how efficiently sawdust is removed from the disc. Here, surface air is used (directed away from the operator), a branch pipe is integrated for connecting an industrial vacuum cleaner and connecting a bag. There are options with a dust container.
Take a look at how the entry point to the power cord tool is executed. Unfortunately, users very often cut the supply cable, so it is better if it is directed strictly backwards, and the input sleeve is as long and rigid as possible. Maximum freedom and safety will be given by a long power cord - 4 meters is no longer a rarity for professional models. Otherwise, you will have to regularly deal with the extension block.
Sooner or later, a circular saw will require replacement of the carbon brushes, otherwise the motor armature is in jeopardy. Therefore, it makes sense to “monitor” this node as well. Well, if there is a separate window for quick access to the brushes, then you don’t have to disassemble the case, or go to the service for this if the device is under warranty. A great option is self-disconnecting brushes: graphite has worn out - the chain has broken (Sparky TK 70). The next nuance is to indicate the status of the brushes, this is a very useful lotion for a traditional brush assembly.
Most likely, under load you will not be allowed to test the saw, but if the seller allows, plug the saw into the network and run it at idle, listen to the level of noise and vibration. Evaluate how strong the air flow is generated by the tool - this largely determines the efficiency of the motor cooling and the quality of cleaning the working area from debris.
If you plan to work with a circular only from time to time, then pay attention to hobby models from well-known manufacturers (Bosch PKS 55 A, Black & Decker CD601). They are designed for relatively short work (15 minutes work - 15 minutes rest) no more than 4 hours a day. This will be quite enough for home use, and you will be able to save a lot. Ironically, household models often outlive their professional counterparts, and the developers provide them with a double warranty (2-3 years).
In general, carefully predict the load that the circular saw will receive at your disposal, and based on this, select the characteristics of the model you are looking for. We hope we have given you enough food for thought.
A circular saw is one of the tools that is used in almost any construction. Today, this unit can be purchased at every hardware store. In this case, you should choose a saw based on its characteristics.
Today, a circular saw is an indispensable tool in construction. With it, you can cut boards of the required size.
Circular saw design
Layout diagram of a circular electric saw.
The circular saw is designed to cut almost any soft material (soft metal, plastic, wood). High performance, fast and accurate cut makes this tool indispensable when working with wood.
Working with a circular saw is quite easy, which allows even a beginner to operate it. However, it is very important to follow all safety rules, as their violation can harm your health.
The main elements of circular saws are:
- Electrical engine;
- frame;
- lever;
- saw blade;
- protective cover;
- platform with guiding device.
In the manufacture of the case, in most cases, heat-resistant and wear-resistant plastic is used. Sometimes in the construction market you can also find a metal case. Given the fact that a circular saw often has to work in dusty conditions, most manufacturers equip the tool not only with a ventilation and cooling system, but also with a waste disposal system from the working area. If the design of the saws does not provide for an integrated dust removal system, then it is possible to connect a forced dust removal system using special adapters or industrial vacuum cleaners.
All circular electric saws are equipped with a commutator electric motor with a power of 0.5 to 2.5 kW. From this indicator will depend on such tool parameters as the maximum number of revolutions and the depth of cut. Not so long ago, battery-powered circular saws appeared on the building materials market. For example, BOSH has released a whole series of such tools that are equipped with batteries of different capacities.
When choosing a saw, special attention should be paid to the quality of the platform. To reduce the cost of the product, most manufacturers use a stamped platform.
However, if the circular saw will be used professionally, it is better to choose a device with a cast aluminum platform, as it will cut the material with greater accuracy.
A ruler is often built into the platform of a circular saw.
Many companies equip the platform with a special line that allows you to control the material processing process.
An important element of the saw is the cutting disc. Currently, you can buy discs on the market that allow you to process almost any material. If you need to quickly dissolve the boards, a wood disc is perfect for you. If you need to work with laminate, then you should buy the appropriate disc, which gives an even and high-quality cut. All this is achieved by using special carbide tips, increasing the frequency of teeth and changing their shape.
Back to indexWhat class of saw to choose?
When working with a household circular saw, it is necessary to take breaks of 15-20 minutes.
Like all construction tools, circular saws are divided into household and professional. The main difference is that in the first case, the saw needs to be worked with short breaks. After about 15-20 minutes of continuous operation, the motor must be allowed to cool down, as a longer operation time may adversely affect its service life.
The operating time of a household saw should be no more than 30 hours per month. If you plan to work harder, then you better get a professional tool. It is worth noting that a professional tool is approximately 2 times more expensive.
Back to indexTable or Hand Circular Saw?
There are special devices for fixing a hand-held circular saw on a desktop.
Stationary circular saws for household needs are practically not used, since they are quite difficult to operate, and the professional version is very expensive and structurally complex. Therefore, in most cases, it is hand saws that are used.
On sale there are special devices with which you can fix the hand saw on the desktop in an upside down position. This allows you to get a stationary mini-machine, which will be very convenient to work with. This mount is not suitable for all models of saws. Also available are models, the complete set of which provides for their installation on the bed. These features of circular saws should be considered when buying them.
Back to indexKey Features of Circular Saws
- Power. As with all construction tools, the main characteristic of circular saws is power, since it is she who is the key to the smooth operation of the device. Circular saws with more power are able to cut material faster, and its density can be higher. On the other hand, low-power saws are lighter, which makes it much easier to operate such a device. For example, a 2 kW circular saw will weigh 7 kg, and a 1.2 kW tool will weigh 3.5-4 kg. When choosing power, you should also consider the size of the blade that will be used to cut the material. The smaller the disk diameter, the less power you can choose.
Circular saws are:- low power (up to 0.8 kW);
- medium power (0.8-1.2 kW);
- high power (more than 1.2 kW).
- The weight. This parameter is also important. Especially it should be taken into account when you are going to work with a saw for a long time and on weight. Therefore, if possible, buy a saw with a light weight.
- Cutting depth. This characteristic is largely determined by the size of the disc used: the larger the disc, the larger the material can be cut with it. If, in order to save money, you decide to purchase a tool with a small disk diameter, then they will not be able to carefully cut a thick workpiece. Lightweight models that are used for household needs have a cutting depth of 40-50 mm. This size is the most popular. For professional work, for example, with a bar, it is recommended to use a blade with a cutting depth of 60-70 mm.
- RPM. This parameter determines the quality and speed of sawing. The rotational speed largely depends on the diameter of the disk, since it is important not how many revolutions per minute the disk makes, but at what speed its edge moves along the workpiece.
- Ability to work at an angle. The design of most models allows cutting at an angle of 45 °, however, there are saws that can work at an angle of 60 °. You can change the sawing angle only from one side, because the engine is located on the other. In the construction market, there are models in which this parameter can be adjusted on both sides.
- Offline work. Cordless saws allow you to work without a stationary power supply. Such models are less efficient. Before buying a circular saw with a battery, you need to think carefully, because the battery life of the device lasts for 30-60 minutes, and the battery can take about 5 hours to charge.
Knowing about its technical parameters will help to decide on the choice of a tool that is used by craftsmen who can perform more complex work. One of these types of equipment is a circular saw for wood. How to choose it for work at home and professional activities? Feedback from experts and ordinary users will help you.
What is a circular saw for wood?
To choose the right disk drive, you should start with its essence. This tool is a cross between a simple electronic jigsaw and a chainsaw capable of sawing thick tree trunks.
The equipment is intended for use both in the work of professionals and at home. The cuts are accurate and fast. Lines with the help of the presented technique are straight and can be produced in wood of various thicknesses.
Disc cut wood in various configurations. This equipment can cut various decorative elements on the material, but the duration of work on it will be higher than that of a low-power jigsaw.
Comparing the work of the presented equipment with the principle of operation of a chainsaw, it should be noted the greater accuracy of the circulation. More powerful equipment is designed for rough cutting. With the help of a circular saw, you can make accurate cuts.
Device
Consideration deserves the constituent elements of such a tool as a circular saw for wood. How to choose the most optimal model, experts suggest.
The heart of the tool is the electric motor. A blade for cutting is fixed on its shaft. Most often, according to experts, synchronous collector motors are used. They incorporate special brushes that can wear out over time. If you miss the moment to replace this part, the engine may break down. Therefore, it is best when choosing a circular saw blade to select a mechanism with automatic shutdown of the motor.
Engine power determines the performance of the entire mechanism. The higher it is, the thicker the boards can be sawn using this equipment. The diameter of the used knives of such a tool as circular saws for wood depends on the power. Their price directly depends on this indicator.
The weight of the circulation will also be higher with more equipment power. Therefore, before choosing a circular saw, it is necessary to determine the amount of work to be done. It is not worth overpaying for more power that will not be used.
Equipment parameters
One of the main parameters that you should pay attention to when choosing an electric-type hand-held circular saw for wood is the number of revolutions. It would be more correct to choose equipment with the ability to control this indicator. This feature will allow you to produce a better cut with an optimal level of load on the equipment.
Must have protective functions of electronics. This will help protect both the equipment and the operator in case of emergency situations at work. There must be an accidental start blocking.
It will be useful to evaluate the appearance of the equipment when buying. It is very convenient to use the additional handle. The material of the product itself must be strong, able to withstand loads and mechanical stress.
Depending on the price, circular saws for wood differ in the cleanliness of the assembly. Balancing should be comfortable, handles should not slip. This will allow you to firmly hold the equipment in your hands.
Types of equipment by functionality
Among the circular saws, there are several main varieties.
The mini circular saw is the first type of tool presented. This is a portable equipment equipped with an electric motor. It is a handy tool for small to medium scale work.
The fixed type of disk for wood incorporates a support. It has a saw on it. Unlike a circular mini-saw, the engine of such equipment is located under the support and is started from a stationary network using a cord.
The third is battery circulation. This is a fairly common type of equipment.
Another type is the miter saw. It has a simple design, having a handle with a start button, a working unit and a saw blade.
Details
A hand-held electric circular saw for wood involves sawing both in a flat plane and at an angle. For this, plates for support and pins are used. An eccentric system is attached to them. The pin allows the equipment to be held at an angle typically 45˚. There are models that allow you to set the slope to 60˚. The slope is only to the right. The engine is usually on the left.
It is possible to set the level of immersion of the saw in the material. The mechanism fixes the equipment on a fixed axis. It is located in front of the support.
One of the most popular devices is the protective cover. At the top, the protection is movable, and at the bottom, it is fixed. From the latter, you can remove sawdust with a vacuum cleaner.
The wire must be protected by strong rubber insulation. Batteries should be used only when necessary, for example, in such a type of equipment as a mini circular saw.
Types depending on power
Three types are distinguished depending on the power:
- The electric motor of the circular saw has a power of 800 to 1200 watts. The thickness of the cut with this tool will be about 45 mm. Suitable for discs up to 160 mm in diameter. These are the cheapest types of equipment presented. Most often used at home.
- The tool is equipped with an average power electric motor of about 1800 watts. Its incision depth reaches 60 mm. This is a semi-professional circular saw. The diameter of its knives reaches 190-200 mm.
- The most productive type of tool, the engine of which has a power of more than 2000 watts. Discs of such circular saws are used from 190 to 350 mm in diameter. Most often, the tool is attached to a workbench. These are professional, powerful saws that have the highest cost.
Saw blades
Knives for saws differ in different technical indicators. Discs are usually divided into types - for wood and similar materials, for metal.
Wood cutting discs have teeth inclined in the direction of travel. The more of them on the details, the more accurate and accurate the cutting itself will be. Otherwise, the cut will turn out to be rough and torn.
A hand-held electric circular saw for wood, which will be used for cutting fiberboard, boards, will require a type of knife with frequent teeth (about 100 pcs.). For cutting a tree that has a lot of knots, you should choose a reinforced disc with 24 cutting edges.
The marking of knives consists of two numbers. The first characterizes its diameter, and the second - the diameter of the landing rod. Discs with a lower rating than provided by the saw should not be installed on the equipment. Otherwise, there will be a space between the part and the casing, where a hand can accidentally get into.
Disc sharpening
Working with dull knives is hard enough, and the engine is subjected to more stress. Therefore, over time, it will be necessary to sharpen the circular saw on wood.
Initially, the teeth are bred with a special tool. Sharpening of a circular saw on a tree is carried out initially from the back surface of the teeth, and then the front row is processed.
The beginning of the work to be done must be marked with a marker. Each tooth should be sharpened the same number of times and with the same effort as the first one.
After the manipulations, the disk is subject to verification. A test cut is being made. If there are extraneous noises, uneven feed of the beam, this is a sign of heterogeneity of the teeth in height. This can be checked by holding the marker close to the cutting surface. After turning the knife, you need to inspect it and identify heterogeneities in sharpening.
Reviews of experts about saws for wood
According to experts, the choice of a good, high-quality tool directly depends on the popularity of the manufacturer, as well as the cost of the equipment. Cheap Chinese tools can not only reduce the quality of work, but also cause accidents. It is better to purchase a circular saw from a well-known manufacturer (for example, Makita, Bosch, etc.). Their cost, although higher, is fully justified.
Circular saws for wood, the price of which is slightly lower than that of foreign counterparts, are produced by domestic manufacturers. For example, the Russian company Interskol produces a wide range of models of circular saws for wood.
Based on the reviews of professionals and ordinary consumers, we can say that a guarantee from manufacturers proven over the years will be able to ensure high-quality and reliable operation of the equipment. Cheap, but unknown companies often cannot provide the required level of durability. Yes, and work on such equipment exposes the master to the risks of injury.
Saws "Interskol"
The Russian company Interskol has proven itself well in the market of equipment for sawing wood. This is one of the most famous domestic manufacturers, whose products are distributed not only in our country, but also abroad. The relatively low price of the equipment (about 3,000 rubles) makes it attractive to consumers.
Among the advantages endowed with a circular saw for wood "Interskol", it should be noted the durability, good ergonomics of the models, as well as the quality of the actions performed with its help.
A wide range of equipment parameters (cutting depth, power and functionality) will help you choose a tool for a variety of wood sawing needs.
The existing additional functions of the circular saws of the presented company will make it possible to give comfort when handling this technique.
Bosch saws
Equipment for sawing wood of the presented company is produced for both home and professional use. Its cost is slightly higher than that of domestic counterparts and is about 4500 rubles.
Of the advantages that the Bosch circular saw has, according to reviews of experts and consumers, it should be noted that it is convenient to hold the tool in your hands, as well as lower vibration noise. It is very convenient to use in work due to the existing adjustment of the speed of revolutions.
It should also be noted that there is a blockage when the engine is overloaded, which can sometimes save equipment from breakdowns. Controls the functions of the electronics system.
This is one of the most famous companies. The quality of its products is widely known in our country and around the world. Therefore, the durability and quality of work on this tool can be guaranteed.
Additional functions of saws
Manufacturers sometimes provide additional features to ensure the most comfortable work with such a tool. Among the most common additions, the following should be noted:
- A hand-held circular saw for wood can be plunged into the material. This allows cutting from the middle of the sheet.
- There are two types of speed control - mechanical and electronic. This will allow you to make smooth, accurate cuts on various materials.
- The sharp braking function of the saw blade increases the level of safety.
- The soft start of the knife should also be attributed to the functions that enhance safety. More often this feature is found in powerful professional saws.
- The accuracy of the cut is increased by the built-in laser marking and illumination.
For wood saws with a powerful engine, it is possible to mount them on the surface, which will allow sawing large volumes of material.
Safety regulations
To avoid accidents when handling the tool, the safety precautions provided by the manufacturer of equipment such as wood saw blades must be followed.
How to choose the right piece of equipment? You should familiarize yourself with the requirements that must be met when working on such equipment:
- The material must be securely fastened to a stable surface.
- It is strictly forbidden to turn the tool upside down while it is running.
- Only use discs that are appropriate for the type of work and of the appropriate size.
- It is forbidden to clamp the power button in ways not provided by the manufacturer.
- Work only in protective glasses.
If all the rules and recommendations presented are followed, the work will be of high quality and safe on equipment such as a circular saw for wood. How to choose the presented tool? Knowing about their existing types and characteristics will help you. Observing all the requirements when working on the presented equipment, there is no doubt about the safety and durability of the equipment.