Corner Grinder- an electromechanical tool designed for cutting, grinding and cleaning parts made of stone and metal alloys. Used when carrying out both construction work, and metalworking works. Another name, grinder, was born in the 70s, when the first representatives of this type of instruments appeared, produced in Bulgaria. The term grinder is traditionally also applied to grinders without angular gears.
Device
The body is shaped like a cylinder, often with a side handle near the attachment point. Inside the angle grinder contains a universal commutator motor (UCM) or a traction converter (in modern angle grinders), a starting switch, an angular gear transmission and an electric motor. Some models are equipped with an angular speed regulator.
Used as attachments special wheels(circles) and brushes, secured with a threaded fastener to the angle grinder spindle. Typically the spindle has an external M14 thread. The brushes have an internal thread and are attached directly to the spindle. The circles only have a through hole and require a flange and clamp nut to attach. For reliable fastening It is necessary to tighten the threaded fastener with considerable force. In this case, it is necessary to block the spindle from rotation. To do this, either two flat recesses are made on the spindle, on which a wrench can be placed, or a special mechanism blocking. Typically, such a mechanism consists of a rod pressed by a spring. When you press the button on the body of the angle grinder, the rod extends and enters the groove on the spindle. In this case, a key is not required, but such a mechanism sometimes jams when working in dusty environments, as a result of which the rod does not return to its original position. It must be remembered that when the machine is operating, the fastening nut self-tightens. If you further unscrew the nut, you can damage the spindle locking mechanism, so it is necessary to use a thick paper gasket between the clamping nut and the metal flange of the cutting wheel. Such spacer mugs in Soviet times came with the car. Please note that the metal flange on the circle must be installed to the clamping nut.
Accessories
One of the uses of angle grinders is polishing various surfaces using lint discs with polishing paste. Sometimes (usually for reasons of explosion safety) an air-driven angle grinder is used, since commutator motors spark during operation. Polishing work usually involves painting and paint solvents, which creates the preconditions for a volumetric explosion.
Warnings and safety precautions
Injuries caused by an angle grinder
The rotation speed of the disk of this machine is 6000 - 15000 rpm; When working with such a machine, you should do following rules:
- Always use a protective cover. Each angle grinder is equipped with a protective casing - a special metal screen in the shape of a semicircle. The protective casing must be installed so that in the event of possible destruction of the disk, the casing protects the person holding the angle grinder from fragments.
- Use discs that match the type of angle grinder in terms of seat diameter, thickness and, most importantly, maximum speed. As a rule, for disks up to 125 mm in diameter this is 10000-15000 rpm, for disks 230 mm in diameter 6000-8000 rpm. The use of discs without markings is prohibited. Exceeding the permissible speed for the disk leads to disk rupture. To be fair, light abrasive discs are usually used with grinders (as opposed to metal ones for circular saw), which, even if ruptured, can almost never seriously injure or kill. However, when operating an angle grinder, every precaution must be taken to minimize the risk.
- Sometimes during work (especially when cutting metal), the disk suddenly jams, and due to the inertia of the angle grinder, it can throw the object being processed quite strongly, or, conversely, try to jump out of your hands, with obvious consequences. This happens almost instantly, and one must always take this possibility into account - hold the car tightly, and estimate in advance the possible direction of such an impact. This especially applies to small angle grinders due to their low mass and very high speeds.
- If the disc is dropped or hit, it is not permissible to continue using it, as this may cause the disc to rupture.
- Under no circumstances should you use circular saw blades with an angle grinder - this is deadly.
- Always wear safety glasses to prevent small particles of metal or other material being processed from getting into your eyes.
- Always work in a respirator to prevent small particles of the processed material from settling in the lungs.
- Wear gloves and clothing that covers the entire body to avoid burns. The temperature at the cutting site can be very high; any flying particle of the material being processed can cause a burn. The best material for work clothes is cotton.
- Always keep the machine at the same angle when processing. At high rotation speeds, the disk becomes deformed and loses its strength. If the rotating disk is slightly misaligned, the disk may burst, causing flying particles to cause injury or other damage.
- Use ear protection, especially when working in enclosed spaces.
see also
- Universal brushed motor
Wikimedia Foundation. 2010.
dic.academic.ru
An angle grinder is... What is an angle grinder?
profile cutting process stone slab using a grinderAngle grinder (angle grinder), collapsible. grinder is a power tool, one of the types of grinding machines, designed for cutting, grinding and cleaning products made of stone, metal and other materials. Used in construction and metalworking.
Device
The body is shaped like a cylinder, often with a side handle near the attachment point. Inside the angle grinder contains a universal commutator motor (UCM), a starting switch or traction converter (for modern angle grinders), an angular gear transmission and an electric motor. Some models are equipped with an angular speed regulator.
Special disks (circles) and brushes are used as attachments, secured with a threaded fastener to the angle grinder spindle. Typically the spindle has an external M14 thread. The brushes have an internal thread and are attached directly to the spindle. The circles only have a through hole and require a flange and clamp nut to attach.
Accessories
Discs used to operate an angle grinderThere are circles for processing various materials, including steels, aluminum alloys, stone, ceramic tiles, etc. Usually the composition of the circle allows it to be used only for certain materials.
Brushes are designed to clean surfaces from dirt, such as rust and paint. The bristles of the brush are made of steel or brass. Brass brushes are softer and wear out faster, but they do not spark or leave scratches on steel surfaces.
History of the name "Bulgarian"
The colloquial name for this instrument is “grinder”. It originated in the USSR in the 1970s, when the first samples appeared there. of this type an instrument produced specifically in Bulgaria, since in the Soviet Union there were practically no products from capitalist countries. [source not specified 92 days]
Notes
Links
- Wikimedia Commons has media related to Angle grinder
dic.academic.ru
An angle grinder is... How to choose an angle grinder? Why do you need a grinder?
An angle grinder is an angle grinder that is a universal tool. It will not be superfluous in any household, because when carrying out repair and construction work, you constantly have to grind, clean or cut something. Therefore, every owner should buy this tool, but before doing so, it is important to decide what characteristics the equipment should have. Decide for yourself what list of operations you have to perform; you should not purchase a tool that performs much more manipulations than you need, since in this case you will overpay. A grinder is a tool with which you can cut slate, metal corners and stone. It can be used to polish a weld or remove rust from a surface. Using this tool, the master can cut ceramic products or clean wooden surfaces. To do this, it will only be necessary to change the nozzles.
General information
Before purchasing the tool described above, you need to decide what materials you will most often use, what cutting depth should be ensured during the work, and whether you want to repair the angle grinders during operation. Before purchasing, you need to pay attention to the weight of the tool, since professional equipment, as a rule, has a significant mass and is unlikely to be convenient for use at home. After analyzing all the functions of the tool, you can choose an adequate model for yourself.
Economy class tool
If you need an angle grinder for wood, then you can choose economy class equipment. It will cost around 1,400 rubles, but for that price you will become the owner of a tool that does not have many important parts and accessories. Some models of this class do not provide adequate reliability and safety. If you use the tool rarely and for a short time, then this model is suitable for you. Its body is made of thin steel, but it will be able to withstand minor loads. Fastening of such a tool is carried out using a clamp with a nut and a tightening screw. It is quite strong, but does not always guarantee convenience in operation, since it will be necessary to use a screwdriver and a suitable wrench. The tool is suitable for everyday use, but the engine is not protected from dust; as a result, small particles of the elements that are to be worked with will contribute to abrasive wear of moving surfaces, and the grinder may require repair. Metal dust can cause a short circuit.
If you carry out construction and repair work on a commercial basis, it is recommended to purchase a more expensive and reliable model that will have better quality.
Middle class tool
The grinder, the price of which is 3,500 rubles, belongs to the middle class instruments. Such equipment is considered convenient and safe. It has sealing inserts and varnish coating rotor, which prevents the penetration of contaminants. Such machines are intended for use in domestic conditions; they are equipped with a clamping mechanism, which ensures quick adjustment of the position of the protective casing. Such tools have convenient start buttons and respond to pressure with a finger in a rubber glove. A similar grinder, reviews of which are often positive, has a more impressive set of functions. It can be used by a left- or right-handed owner, since the handle can be screwed on one of two sides. For convenience, some models of this class allow you to install the handle on top.
Professional equipment
Repairing an angle grinder will most likely not be useful if you purchase a professional tool. The mechanism of such equipment is protected from dust and has a soft start function. This guarantees a gradual increase in disk speed. That is why such a tool can be connected even to a weak electrical network. Tools of this class are protected from vibration; manufacturers install on them an automatic balancing system for the operating disk. The cost of such equipment can start from 4,000 rubles, and the final threshold is very impressive.
Criterias of choice
A grinder is a tool that should be selected according to several criteria. The first of these is the area of use. The second thing you should pay attention to is the number of handles. For domestic use, their number may be limited to one unit. However, if you choose professional equipment, then there should be two handles. Among other things, these components of the equipment must be rubberized.
Disk size and hardware power
Grinder circles can have different diameters. The minimum size is 115 millimeters. It can be used to carry out the most simple work. The largest disc size is 230 millimeters. With it you can cut bricks, pipes, slabs, and everything else you need. If you choose circles for an angle grinder that will be used at home, then optimal diameter you should prefer 125 millimeters. If you are renovating an apartment or house, you should choose a 180 mm disc. Equipment power can vary from 0.5 to 2.5 kW. The choice of this parameter depends on the duration of the motor operation - the motor power should be sufficient to spin the disk.
Additional functions
A grinder is a tool that sometimes has to be used for a long time. That is why it is important to take into account the presence of additional functions, among them the smooth start option. Such a system will allow the equipment to start without jerks, this will smooth out voltage surges that occur in the network. You can also pay attention to the presence of automatic disk balancing. This function will be useful if they wear unevenly. The system smoothes out unevenness and reduces vibration. If you purchase an angle grinder of sufficiently high power, then it must have an anti-jam function. This option will prevent Negative consequences, in which the engine may turn off automatically. It is important that the use of such a tool is safe. For this purpose, the equipment is equipped with restart protection. If the current supply was stopped and then resumed, the grinder should not start working on its own. Please ensure that the grinder has protection for the motor from the penetration of all kinds of particles and dust.
Conclusion
When working with this electric tool, we must not forget that long-term and frequent overloads can cause the machine to fail. Therefore, when carrying out work, it is imperative to periodically stop the equipment’s motor, which will not only prevent possible overheating, but also eliminate the need for repairs. By the way, it can be very expensive. If you want to become the owner of high-quality equipment, no matter what class it belongs to, it is important to ask the seller whether the instrument has a quality certificate. In addition, it is necessary to take care of the warranty, as well as maintenance throughout the entire period of operation. Those manufacturers who are concerned about their reputation provide a fairly long warranty for their product, which protects the buyer from purchasing low-quality equipment.
fb.ru
What is an angle grinder: types, characteristics
When finishing work you cannot do without this tool. So - what is a grinder? This is an angle grinder that makes polishing and sanding any surface easy.
- Purpose of the grinder
- Types of grinders
- What is an angle grinder video:
- Discs and attachments for grinders
- How to choose an angle grinder?
- What is an angle grinder video:
The body of the grinder (usually cylindrical) are made of impact-resistant plastic. The key elements of the tool are the motor and gearbox. The electric motor is hidden in the body of the angle grinder; it “starts” the drive gear of the gearbox, which rotates the larger “driven” gear, on the axis of which the working disk of the tool is mounted. The task of the gearbox is to reduce the number of disk revolutions. A powerful engine can “give out” a higher number of revolutions than is required for high-quality processing of the material - for example, modern commutator motors accelerate to 30,000 rpm, and the average rotation speed of the tool nozzle is only 10,000 rpm.
In the photo there are types of grinders
Purpose of the grinder
The use of an angle grinder depends on which attachment is installed. The tool can be used for polishing, grinding, processing metal and concrete (in this case, abrasive and diamond wheels will be required).
A grinder with a cutting disc (an attachment designed not for grinding, but for cutting materials) is used to work on bricks and tiles, protect metal surfaces from rust and process seams after welding.
Note!
A wire brush tool can be used to remove paint or corrosion from metal surfaces.
Which grinder is better depends on the amount of work you plan to do with its help.
In the photo there is a Bulgarian
Types of grinders
Conventionally, tools of this type are divided into household and professional - the latter are more powerful. Household models are not able to work for a long time without interruption - they need to be stopped every 15-20 minutes and “allowed to cool” for the same period of time. The range of functions of household angle grinders is simpler than that of professional tools.
The format distinguishes between two-handed and one-handed instruments. Both types can be equipped with a removable handle. The additional handle can be rearranged to make holding the sander as comfortable as possible. Handles are usually made of vibration-absorbing material.
There are low-power (700-900W), medium and powerful grinders (from 900 W to 1500 W and over 1500 W, respectively). The power of the grinder affects the maximum allowable size of the working disk - the greater the power, the larger the disk that can be placed on the grinder and the larger the surface that can be processed with the tool in one step.
What is an angle grinder video:
Discs and attachments for grinders
Types of discs vary in diameter and material. For low-power and medium-sized tools, discs with a diameter of 100-150 mm are used; for powerful tools, discs with a diameter of 180-230 mm are suitable.
Discs for grinders can be grinding and cutting. Grinding discs are made wider and thicker so that the attachment can cope with the load.
Note!
Diamond cutting discs are used to work with materials other than metal - granite, tiles or ceramics.
To work with small planes use cup grinding wheels. They are used to clean plastic, remove thick layers of paint, and adjust panels. Polishing pads are used to work with a wide range of materials - they are suitable for processing wood, plastic, stone and metal.
Ordinary grinder
How to choose an angle grinder?
A tool is chosen depending on how often and for what volume of work it will be used. Household grinders can work about 20 hours a month. If the need for a tool arises often, for “home” use it is worth taking either a household model maximum power, or professional - minimal.
When purchasing, check the serviceability and quality of the grinder. The noise of the switched-on instrument should be uniform. If a burning smell appears during operation, you should choose another model. Body parts made of plastic are also checked: they must be intact, smooth, and high-quality processed.
Additional characteristics are determined depending on what work will be performed by the grinder. If the grinder is used to work with stone or concrete, it is important to protect the housing from dust and material particles that are formed during operation. For metal work, a model with a small number of revolutions is suitable; for stone processing, a larger number will be required.
What is an angle grinder video:
An angle grinder is an electric angle grinder that can be used to cut metal, angle, stone, and slate.
It is possible to grind welds or clean rusty formations from the surface.
This power tool allows you to clean wooden surfaces and cut ceramic products.
Let's figure out why angle grinders were called that, why they are used, what is the difference between one angle grinder model and another, depending on the class?
Why was the Bulgarian called that?
First, you need to figure out why a grinder is called a “grinder”. An angle grinder is an angle grinder, which is used for cutting both wood and stone, and for grinding different surfaces. The name “grinder” appeared in 1970 in the USSR. Then the Bulgarian factory, which still makes angle grinders, produced the first samples of the tool. The “homeland” of the instrument is Bulgaria, which is why it is called that. People appreciated the “Helper”; since then the name “Bulgarian” has stuck with useful tool and has reached our times. Despite the cute name, the angle grinder - the grinder - has a very tough but loyal character!
Angle grinders (angle grinders) offered on the market have many differences. How does one grinder model differ from another? This tool can be divided according to the scope of application into economic and industrial classes.
For example, if the classes are swapped, then it will be very difficult to use an industrial grinder on the farm due to its weight, dimensions and power; you need to use another one.
As for industry, a light small grinder will be of little use there, because it simply cannot perform many heavy operations due to its lightness, low power and limited functionality.
To choose a universal electric tool, you need to decide on the type of work you plan to do. If they are large enough, then a tool with a low price and a small list of functions will not be suitable.
How are they different in industry?
The purpose of an angle grinder in industry depends on its class, the difference between which is as follows:
Economy class
Inexpensive grinder with limited equipment with important parts and accessories. Some models of this class do not have sufficient reliability and safety. The tool is well suited for rare and short-term work.
The body of an angle grinder - an angle grinder - can withstand minor loads. Although the fastening is quite strong, this does not always guarantee ease of use.
What is it for? For household work the tool fits well, but it is worth keeping in mind that the engine is not equipped with dust protection; during operation, small particles will get inside and accelerate the wear of moving parts. This will lead to the need to repair the instrument. Metallic dust causes a short circuit.
For repair and construction work, a more expensive and reliable angle grinder with high quality characteristics is used.
Middle class
Equipment of this type is quite convenient and safe to use.
Has sealing inserts and paint coating engine, which prevents dirt from penetrating into the instrument. Angle grinders (angle grinders) are designed for domestic use; they have a clamping mechanism, ensuring quick adjustment of the position of the protective casing.
The tool is equipped with convenient start buttons that respond even to pressure with a finger in a rubber sleeve. The ability to screw the handle on either side makes the use of such a tool convenient not only for right-handers, but also for left-handers.
To ensure that the tool can be used comfortably, certain models of angle grinders support the installation of the handle on top.
Professional class
A professional tool very rarely requires repair of an angle grinder - an angle grinder. The mechanisms are protected from dust, and the tool itself is equipped with a soft start function, which allows you to gradually increase the speed of rotation and operation of the disk.
The grinder can be connected to a lower power circuit.
A tool of this class is equipped with vibration protection thanks to a powerful auto-balance system for the working disk.
Criterias of choice
angle grinder angle grinder you need to choose, paying attention to several criteria.
First: scope.
Second: the number of handles.
Third: equipment elements must be rubberized.
Power and disk size
Bulgarian women have different sizes and circle diameters. Minimum size equals 115 mm. This circle is designed for simpler work. The largest size is considered to be a diameter of 230 mm. With the help of such a circle it is possible to cut bricks, slabs, pipes and everything you need. Optimal choice A circle for homework will be considered to have a diameter of 125 mm. To renovate a house or apartment, you need to choose a circle equal to 180 mm. The power of the tool varies from 0.5 to 2.5 kW.
The choice of this parameter depends on the duration of operation and motor power. The engine power must be sufficient to spin the disk.
Additional options
Among the many additional options, it is worth noting the soft start function. The system allows the tool to start without jerking, smoothing out power surges that occur in the electrical network.
You should pay attention to the presence of auto-balancing of the disk. This option is useful in cases where the discs wear unevenly.
Vibration is smoothed and reduced. A higher power angle grinder must be protected from jamming. This function allows you to avoid a negative situation and consequences in which the electric motor can turn off automatically.
Conclusion
Do not forget that long-term and frequent overloads can cause breakdowns and failure of an electrical appliance. When carrying out work, it is necessary to periodically make stops, which, in turn, will help not only eliminate and prevent overheating, but also save the user from carrying out unscheduled repairs. Repairs can often be quite expensive.
To purchase quality equipment, you need to ask the seller for a quality certificate for the device you are purchasing. Maintenance of the instrument throughout its entire life will be important. warranty period use. Manufacturers who care about the reputation of their company provide a very long warranty for their products, which will protect the buyer from purchasing low-quality and defective equipment.
Users who choose a tool based on the price-quality principle note many positive aspects of the grinder, good timing services.
If all standards, safety precautions, and working conditions are followed, the equipment can serve faithfully for quite a long time. In case of breakdown after correct operation repair of the device can be much cheaper compared to the cost of repair with misuse the device in unsuitable conditions or used for purposes other than its intended purpose.
pro-instrument.com
Grinder: what is it, why is it called that, how can it be used, device diagram
Today in everyday life almost everyone home handyman There is a Bulgarian. However, many people do not know why it is called that and what functions this tool can perform besides regular cutting. From this article you will learn the origin of the unusual name of the grinder, its structure, and what else it can be used for.
What is the correct name for a grinder?
The familiar name to everyone - grinder - is so common that few people remember why it is called that. This tool is correctly called angle Sander(angle grinder). Initially it was intended for processing internal corners at the junctions of two planes. The first copies of such machines arrived in the Soviet Union from then-friendly Bulgaria, where they were produced. According to the common habit of the people, they tried to shorten the long and inconvenient name. As a result, a new word has firmly entered into everyday use - Bulgarian. But the correct name is indicated on the packaging - angle grinder.
Sometimes manufacturers use the SHMU (angle grinder) or LNA variant.
Gradually, all power tools that looked similar to the prototype began to be called this way. Although there is a difference between them. For example, a grinder is often called a cutting machine.
There is undoubtedly an external similarity, but the cutting machine is equipped with a platform so that the cut is directed perpendicular to the surface being processed, which is how it differs from the grinder.
What can this tool do?
A classic grinder is a hand-held power tool with an abrasive wheel. The main purpose of the grinder is to process the joints of flat metal surfaces. However, it can be used for other operations. The main wheel is great for cutting sheet metal, end cutting of pipes and fittings. Simple replacement of the working circle with a disc with sandpaper The sander turns into a polisher. You can use an angle grinder in this capacity when processing pipes for railings, flat or curved surfaces before mirror shine. In addition to metal work, a grinder can be used to cut ceramic tiles. To do this, you need to use a concrete circle as a working disk. The list of operations that can be done using an angle grinder is very wide.
Each type of material requires special discs for its processing:
- grinding disc for metal 5-6 mm thick;
- flap sanding disc;
- cutting wheel for metal 2 mm thick;
- cutting wheel for concrete and ceramics with a diamond edge;
Design and principle of operation of an angle grinder
The design of an angle grinder is quite complex. What an angle grinder consists of can be understood by looking at the figure below.
The design of the machine can be divided into two parts:
- electrical;
- mechanical.
Simplified electrical diagram The angle grinder looks like this:
The heart of the angle grinder is the commutator motor alternating current. The supply voltage is supplied through the stator winding via carbon brushes to the rotor commutator (rotating part) of the electric motor. The rotor contains sections of windings, the terminals of which are located on the rotor armature plate.
Cheap and low-power angle grinders rotate at a constant speed. More powerful models are equipped with a regulator on the handle that allows you to change the engine speed.
Bearings mounted in the housing are mounted on both sides of the rotor shaft. This ensures stable shaft direction during operation. The rotation of the electric motor is transmitted to a gearbox, which changes the direction of rotation and transmits torque to the cutting wheel.
The gearbox consists of two helical gears. The small one is put on the motor shaft, and the large one is on the gearbox axis. A working tool (wheel) is attached to the part of the gearbox axis that extends outwards - the spindle. Professional models are equipped with a release clutch - it stops the rotation of the working part of the tool if for any reason the wheel gets stuck in the material being processed. Without such a coupling, the disk of the circle may break and fly into fragments in different directions. Part of the surface of the circle is covered with a protective cover that protects the face and hands from flying from under cutting edge sawdust and dust.
The working circle is secured to the spindle with a quick-release nut using a special wrench. The immobility of the spindle when tightening the nut is ensured by a button on the side of the gearbox housing opposite the circle. The plastic body of the angle grinder has longitudinal slotted holes. They cannot be closed during operation; the electric motor is cooled through them.
tehnika.expert
Angle grinder. Let's cut and clean!
Almost any man uses a power tool as needed - to cut something, grind something, drill something. One of the most popular electrical mechanisms for performing various works is an angle grinder (angle grinder).
Why is an angle grinder called an angle grinder?
An angle grinder is also popularly called an angle grinder. To understand where this name came from, you need to dig a little into history.
In the Soviet Union, the word “Bulgarian” appeared in everyday life in the late sixties of the last century. At that time, far from us, the Bulgarians bought a license from the Bosch company to produce angle grinders. Since the goods of capitalist countries were unavailable in the USSR, this instrument of Bulgarian production appeared in the fatherland. At that time, Bulgaria was a country of the socialist community, and our trade relations with this state were well established. Therefore, in the USSR, first of all, angle grinding machines of this country appeared, hence the name. The instrument from Bulgaria began to be called the “grinder”.
Types of angle grinders and their purpose
An angle grinder is a tool necessary for carrying out construction or repair work. This tool is convenient to use when material needs to be cut, cleaned, or sanded. Of course, all this work can be done using hand tools, but then you will have to spend a lot of time.
The “grinder” is considered a fairly universal tool; it can be used to perform various types of work:
- Clean weld seams;
- Cutting metal (eg. drainpipe);
- Grind various surfaces;
- Cut concrete or stone (using a special abrasive wheel);
- Work with ceramic tiles.
The scope of application of angle grinders is wide; it would be difficult to list all the work performed with its help. Angler grinders are divided into two types according to their intended purpose: professional and household. Unlike household grinders, professional machines can work in a more difficult mode, withstanding long-term loads. True, such a tool is more expensive - higher quality materials are used for its manufacture. The electric motor of a professional angle grinder is capable of operating almost continuously for several hours without overheating.
Angle grinders also differ in size. Large grinders allow you to use cutting wheels of larger diameter; a small angle grinder can only accommodate a small disc. Each angle grinder size has its own advantages when carrying out certain works, and it will not always be convenient to use a large grinder. The large tool is convenient to use when you need to:
- Make a deep cut (for example, cut a large diameter pipe);
- Cut through a thick layer of material;
- Treat hard materials (concrete, stone).
Small grinders are convenient for performing various grinding and polishing work. First of all, the angle grinder was intended for this purpose - it’s not for nothing that the name of the tool contains the word “grinding”.
Characteristics of angle grinder
The main characteristics determine in what capacity it is best to use an angle grinder. We can highlight:
- Disk rotation speed (number of revolutions);
- Power;
- Functionality;
- Weight and size.
Rotation speed is important in professional activity. With a low number of revolutions, it is impossible to carry out some work, or the processing process will progress slowly. Some types of work must be performed only at reduced disk speeds. Many inexpensive grinders have only one speed. As a rule, it is quite high (about 10–11 thousand rpm).
The power of modern angle grinders ranges from 500 to 2800 watts. It doesn't hurt to have some extra power, and usually a professional tool is more powerful.
Weight and size are also of considerable importance for various works. It is not always convenient to use a large angle grinder, despite more power tool. For example, when cleaning car body parts, a bulky angle grinder will be difficult to hold for a long time, and generally inconvenient to use large instrument. A small machine will not be able to make a deep cut, since it is impossible to install a large cutting disc into it.
Functionality is important for carrying out complex work, requiring special conditions. TO additional functions Angle grinder can be classified as:
- Availability of speed control;
- Possibility of smooth start;
- The presence of an additional handle;
- Availability additional protection from vibration.
Cutting disc parameters
Cutting discs (circles) are determined by two main parameters:
- Size,
- Purpose by type of material.
There are five main diameters of cutting wheels: 230, 180, 150, 125 and 115 mm, but professional discs can be 300 mm or larger. Accordingly, larger diameter wheels are suitable for larger angle grinders. Cutting discs also have different thicknesses, and it can be from 1 to 4 mm.
The circles differ in their purpose - in the type of material that you will have to deal with when working. There are discs for metal, stone, wood, reinforced concrete. The circles themselves can be made from different materials and have different shape.
Choosing an angle grinder for home use
For work at home, there is no need to buy a large grinder - just purchase a tool designed to install a cutting disc from 115 to 150 mm. Since small angle grinders do not have very high power, then you should choose the most optimal model by this parameter. The best solution will purchase a machine with a consumption of 1000-1200 watts.
It is better to choose a tool model with a speed controller and a “soft” start - the angle grinder will start smoothly, and at different speeds it will be possible to process materials more efficiently. You should also pay attention to the comfort of the handle. It would be nice if the handle had anti-vibration properties.
And another important factor is the choice of tool manufacturer. You should not buy an angle grinder of unknown origin - everyone knows that the miser pays twice. There are many popular brands that have proven themselves only on the positive side. It is unlikely that purchasing an angle grinder from Metabo, Bosch, DeWALT, or Makita will be a disappointment. And, of course, you shouldn’t buy a second-hand instrument.
proinstrumentinfo.ru
For what purposes is the grinder used and why did it get such a name?
Sometimes during the renovation process, including when laying tiles, it is necessary to cut some material. When tiling, a conventional tile cutter may not cope with its task, for example, if it is necessary to make a curved cut. In this situation, an angle grinder (angle grinder), as the grinder is correctly called, is used. Let us consider in this article why the angle grinder received such a strange name, as well as its structure and main areas of application.
Why did the Bulgarian get such a name?
So, let's look at why the grinder is called the grinder. In general, it is incorrect to call it this way. The term angle grinder is more appropriate, as it reveals the basic essence of the design and application of this tool. The term “grinder” is more familiar to our ears, because some self-taught craftsmen do not always know the correct name. This term came into use in our everyday life back in the 70s of the last century. This is due to the fact that it was during this period that this instrument appeared in the Soviet Union, and it was released in Bulgaria. The name “grinder” is shorter and understandable to almost everyone, so it is unofficially more widespread.
Consideration of what can be done with an angle grinder
Firstly, a grinder is used where you need to cut something at an angle, for example, a pipe coming out of a wall. You can also use it to cut a strip in a sheet of material, where it can be quite difficult to operate with a regular hacksaw.
Secondly, the grinder is used for grinding various surfaces. For this purpose, special attachments are used, which can be purchased at any hardware store. It should be understood that the grinder is used for rough grinding of surfaces, since semicircular marks from the nozzle remain on it. Finer grinding is done using professional grinders.
You can also sharpen the grinder. Thus, you can prepare the ends of the pipes before cutting the thread or adjust it after cutting so that the coupling or nut is screwed on more easily.
A grinder is also used to trim the tiles before laying them. In this case, work should be carried out wearing a mask and goggles to protect against dust. Trimming is done using a special diamond-coated cutting wheel. It should be remembered that with the help of a grinder you can make not only a straight cut, but also a curved one.
Main components of an angle grinder
The design of an angle grinder may vary among different manufacturers, so we will consider only its main components. This will allow you to understand what you should pay attention to when choosing this tool, as well as identify a malfunction in the event of a breakdown.
Main components:
- grinder body. It is made of impact-resistant plastic and is designed to hold all the elements arranged in it in place. Also, with the help of the housing, the operator’s force is transmitted to the equipment;
- gearbox It consists of gears, with the help of which the axis of rotation rotates 90 degrees. Also, gears allow you to reduce the number of revolutions to the optimal level;
- electric motor It is located in the tool body and is designed to drive the drive gear of the gearbox, from which torque is transmitted to the driven gear. There is a disk on the axis of the large driven gear;
- electronics, which may include various soft start systems, start buttons, speed control, etc.
Thus, we learned what the grinder is correctly called, as well as for what purposes it is used and what main components it consists of.
Additional Information.
March 8, 2018We sometimes get so used to the unusual names of things around us that we are not curious about the origin and history of the name. But it’s still interesting to know why the grinder is called the grinder. Look further for interesting details about the instrument itself and its name!
Why is the grinder called the grinder?
The explanation here is simple. Much in Russian speech gets its name depending on the country, region, area from which it came to our open spaces. As an example, let's take the polka dance, the Finnka - a Finnish knife, the Dutch stove (built according to the Dutch model).
It is now approximately clear to the reader why the grinder is called this way. In Russia this handy tool for the first time it began to be supplied from Bulgaria.
Interesting fact: except for the Russian Federation and a number of post-Soviet countries, nowhere in the world is this device called an angle grinder. Its official name is used - angle grinder.
History of the name
Knowing why the saw is called a grinder, let's delve a little into the history of the common name. This instrument was first supplied to the Soviet Union back in the 70s. The importer was the socialist republic of Bulgaria, friendly to the USSR.
Soviet users of the tool, seeing the name of the country of manufacture on the nameplate, soon dubbed the saw itself a grinder. The direct manufacturer of the device was the Sparky Eltos company. It must be said that it continues its work even now. You can easily find Sparky brand products on the market for similar products.
I must say, today this brand is not particularly relevant. On the market, his products are classified as semi-professional. However, in cost they are not inferior to professional tools produced by such well-known brands as Bosch, Hitachi, Makita. However, Sparky has ardent followers who prefer devices only from this manufacturer.
Another explanation for why the grinder is called the grinder. In the seventies, goods shortages were at their peak in the USSR. Therefore, on store shelves there were only tools from the Bulgarian supplier "Sparky". Since there were no other importers or manufacturers, the device was destined to receive the capacious name “grinder”.
If we turn to the history of those years, we will see another fact that contributed to the establishment of this name for the instrument. Why is the grinder called that? At that time, many Bulgarians came to Soviet construction sites. Many workers also had their own tools with them.
Today, similar instruments in everyday speech are usually called the same. Grinders will be devices of both domestic and any other foreign production.
What is the correct name?
Let's now get acquainted with the official name of the tool. This is an angle grinder - an angle grinder. Agree, “grinder” sounds simpler and is remembered much faster.
But the instrument has another, less known, but also interesting name. angle grinder sometimes colloquial speech called "monkey".
But why an angle grinder? Here's the explanation:
Facts about the instrument
Knowing why an angle grinder is called an angle grinder, it would be useful to consider the device itself. An angle grinder is a power tool, a type of grinding machine. Its main application is abrasive processing. This includes grinding, cutting, and cleaning metal, stone and other materials. Angle grinders are widely used in wood and metalworking and construction.
The body is shaped like a cylinder. Often equipped with a side handle. Contains the following elements:
- UKD (universal commutator motor).
- Gear angular transmission.
- Start switch.
- Disk mounting unit.
- Some models have a disc speed control.
Attachments are special abrasive discs and brushes. Usually it's the following:
What else is a grinder?
A Bulgarian is a citizen of a given state. In addition, this is the name given to a female person of Bulgarian nationality.
It is also a common toponym. Bulgarian is the name given to villages in Ukraine, Kazakhstan, as well as in Bulgaria itself. One of the Tvyrditsky mines also bears this name.
A grinder is an angle grinder, an angle grinder. Also, this common power tool is sometimes popularly called a “monkey”.
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On the page we answer most questions regarding the grinder
What is the correct name for a grinder?
The correct name is an angle grinder (angle grinder). Or a little shortened - angle grinder. Grinding machines are produced various types: angular, vertical, straight, eccentric, tape.
Why is an angle grinder called an angle grinder?
The word grinder first appeared in popular slang in the 70s of the last century in the USSR, when Bulgaria began to supply its first tools - angle grinders produced at the Sparky Eltos enterprise in the city of Lovech. It takes a long time to call a tool in everyday life or at work an angle grinder, so people shortened this name to a short and succinct one - an angle grinder, according to the country where the tool was produced. This is how the name angle grinder - grinder - stuck in everyday life.
The word Bulgarian has taken root in colloquial speech since the times of the USSR and is still used in the CIS. So on the Russian-language Internet, the word grinder is used in searches 320,000 times, and the word angle grinder is used only 10,000 times. In Bulgaria at that time, the grinder was called flex, since the capitalists’ first angle grinders were produced by FLEX-Elektrowerkzeuge GmbH. You will be surprised by the spelling of the grinder - angle grinder on Bulgarian language- ъgloshlayfi (Ъгъл - angle). In English, an angle grinder is written - angle grinder, in German - winkelschleifer.
How do Bulgarians react to Bulgarian slang in Russia?
It is interesting to observe the reaction of Bulgarians when, for example, they read the following text from the instructions for working with an angle grinder: It is prohibited to work with an angle grinder if you are unwell, ill, or under the influence of alcohol or drugs. When working with an angle grinder, it is prohibited to wear jewelry that the angle grinder could wrap around itself. In the text we associate a grinder with a tool, and Bulgarians with a woman. Accordingly, they are puzzled by the instructions: The grinder must be used in a stable position with personal protective equipment.... it is forbidden to use it if it makes extraneous noise..... in those places where the grinder is used there should be fewer people.... the handle of the grinder is made of vibrating material...etc. Or the search query “buy a grinder cheaply.”
In Russia, not only is the angle grinder named after the country - grinder, but also, for example, there is a haircut - Canadian, a stove - Dutch, a knife - Finnish, flu - Spanish, dance - polka... Abroad, similarly, there is Russian roulette, roller coaster .
Why do you need a grinder?
The grinder is one of the most popular power tools used in construction, car services, and everyday life. It applies:
- - for grinding (according to the name);
- - for cutting various materials: metal, natural stone, ceramic tiles, bricks, plastic
- - for metal processing: cleaning metal surface from rust; cleaning before and after welding, before painting; metal deburring
What is the difference between Bulgarians?
- - various manufacturers of angle grinders: Atlas, AEG, Hilti, DeWALT, BOSCH, Makita, Black&Decker, Einhell, Elmos, Hitachi, Kress, Makita, Metabo, Sparky, Interskol, Caliber...
- - there are industrial, professional, household, and some manufacturers make exclusively industrial power tools with increased reliability (Atlas Corco, Hilti), others only for household use, others produce power tools in various color scheme(Bosch makes of blue color a professional tool, but a green household one)
- - disc diameter: 115, 125, 150, 230 ...
- - disc rotation speed (usually for circle 125 it is adjusted from 2900 to 11000, for circle 230 the speed is 6500)
- - power: conditionally low 500 - 900 W, average 900 - 1500 W, powerful from 1500 W
- - With electrical power mains, pneumatic or battery-operated;
- - technical differences: the ability to adjust the speed, quick-release protective covers, a vibration handle, limiting the starting current (soft start), maintaining constant speed under load, protection against unintentional starting, a tool shutdown system when the disk is blocked, etc.
What does the grinder consist of?
An angle grinder often includes:
- - Electrical engine with improved ventilation
- - gearbox
- - abrasive wheel
- - spindle for fixing the disk, M14
- - protective casing
- - handle (usually with vibration absorption)
- - electrical cable with plug
What safety precautions must be observed when working with an angle grinder?
- You need to wear goggles or a protective mask when working
- When working, wear thick gloves to protect your hands from flying sparks.
- Do not remove the protective cover to use larger diameter wheels.
- It is better to use a dust mask, especially when working with stone
- Clothes should not be too wide so that they cannot get caught in the rotating circle.
- Before work, inspect the wheels, housing and electrical cable for chips and damage.
- You can't use a grinder on wood
You need to work in a stable position, holding the grinder firmly. The power cord should be kept to the side; it is better to secure the metal being cut in a stationary state. Make sure that when cutting the metal the circle does not get pinched. It is necessary to cut so that the direction of rotation of the circle coincides with the direction of the cut. The protective cover was aimed at the worker.
The history of the creation of an angle grinder
The angle grinder was invented in Germany in 1954 by Ackermann + Schmitt (FLEX-Elektrowerkzeuge GmbH). The company was founded by Hermann Ackermann and Hermann Schmit in 1922 in Stuttgart-Bad Cannstatt. First they invented manual grinding machine MS 6 with flexible shaft (flexen). And then the world saw the first angle grinder of the DL 9 brand.
The history of the creation of Sparky in Bulgaria
Short story SPARKY ELTOS AD plant, Lovech, Bulgaria
- 1961 Creation of production
- 1965 Start of production of power tools
- 1966 Purchase of the first AEG license (production capacity of 500,000 machines achieved)
- 1975 Purchase of the second AEG license (production capacity of 1,000,000 machines achieved)
- 1996 Privatization of the SPARKY GROUP plant
- 1997 ISO 9001 certification
- 1998 Listed on the stock exchange; code: SL9/ELTOS
- 2003 Certification of the Technical Laboratory according to ISO/IEC 17025:1999
- 2004 ISO 14001 Certification - Environmental Management System
- 2006 Certification according to OHSAS 18001 - occupational health and safety management system. The equipment began to be produced under the SPARKY PROFESSIONAL brand.
- 1997-2012 Investments in fixed assets of about 39 million euros
- 2013-2015 Investment program of 8 million euros
This page answered only a small part of the questions about the grinder. In the future we will try to cover other questions: Which grinder is the most reliable? Which grinder is better to buy for your home? How to choose an angle grinder? and others.
We sometimes get so used to the unusual names of things around us that we are not curious about the origin and history of the name. But it’s still interesting to know why the grinder is called the grinder. Look further for interesting details about the instrument itself and its name!
Why is the grinder called the grinder?
The explanation here is simple. Much in Russian speech gets its name depending on the country, region, area from which it came to our open spaces. As an example, let's take the polka dance, the Finnka - a Finnish knife, the Dutch stove (built according to the Dutch model).
It is now approximately clear to the reader why the grinder is called this way. In Russia, this convenient tool was first supplied from Bulgaria.
Interesting fact: except for the Russian Federation and a number of post-Soviet countries, nowhere in the world is this device called an angle grinder. Its official name is used - angle grinder.
History of the name
Knowing why the saw is called a grinder, let's delve a little into the history of the common name. This instrument was first supplied to the Soviet Union back in the 70s. The importer was the socialist republic of Bulgaria, friendly to the USSR.
Soviet users of the tool, seeing the name of the country of manufacture on the nameplate, soon dubbed the saw itself a grinder. The direct manufacturer of the device was the Sparky Eltos company. It must be said that it continues its work even now. You can easily find Sparky brand products on the market for similar products.
I must say, today this brand is not particularly relevant. On the market, his products are classified as semi-professional. However, in cost they are not inferior to professional tools produced by such well-known brands as Bosch, Hitachi, Makita. However, Sparky has ardent followers who prefer devices only from this manufacturer.
Another explanation for why the grinder is called the grinder. In the seventies, goods shortages were at their peak in the USSR. Therefore, on store shelves there were only tools from the Bulgarian supplier "Sparky". Since there were no other importers or manufacturers, the device was destined to receive the capacious name “grinder”.
If we turn to the history of those years, we will see another fact that contributed to the establishment of this name for the instrument. Why is the grinder called that? At that time, many Bulgarians came to Soviet construction sites. Many workers also had their own tools with them.
Today, similar instruments in everyday speech are usually called the same. Grinders will be devices of both domestic and any other foreign production.
What is the correct name?
Let's now get acquainted with the official name of the tool. This is an angle grinder - an angle grinder. Agree, “grinder” sounds simpler and is remembered much faster.
But the instrument has another, less known, but also interesting name. An angle grinder is sometimes colloquially referred to as a “monkey”.
But why exactly angular? Here is the explanation:
Facts about the instrument
Knowing why an angle grinder is called an angle grinder, it would be useful to consider the device itself. An angle grinder is a grinding machine. Its main application is abrasive processing. This includes grinding, cutting, and cleaning metal, stone and other materials. Angle grinders are widely used in wood and metalworking and construction.
The body is shaped like a cylinder. Often equipped with a side handle. Contains the following elements:
- UKD (universal commutator motor).
- Gear angular transmission.
- Start switch.
- Disk mounting unit.
- Some models have a disc speed control.
Attachments are special abrasive discs and brushes. Usually it's the following:
What else is a grinder?
A Bulgarian is a citizen of a given state. In addition, this is the name given to a female person of Bulgarian nationality.
It is also a common toponym. Bulgarian is the name given to villages in Ukraine, Kazakhstan, as well as in Bulgaria itself. One of the Tvyrditsky mines also bears this name.
A grinder is an angle grinder, an angle grinder. Also, this common power tool is sometimes popularly called a “monkey”.