Rotational speed
The angle grinder can develop a rotation speed of 2800-11000 rpm. The maximum speed will be shown by a small disc, in large discs the speed indicator is reduced: its limit is 6600 rpm. If it is higher than the maximum permissible value, the disc will begin to collapse. It wears out faster at low speeds. On the case of each model there is a plate indicating the permissible speed.
Dependence of the spindle speed on the diameter of the working disk
Power
This indicator depends on the diameter of the disc, and the larger the disc, the higher the power of the device. Its range is 0.5-2.7 kW. For normal operation with a 125 mm disc, the power should be at least 0.75 kW, with a maximum circle diameter of 230 mm. 2.2 kW.
For household models, a power of 0.8-1 kW is enough, for cutting hard materials such as concrete, a model with a parameter of 1.5-1.7 kW is required.
Types of equipment
The choice of the disc diameter will completely depend on the angle grinder itself and the type of work to be done. There are five sizes in total: diameters 115, 125, 150 mm are intended for non-scale household chores.
The cutting depth of the model with 125 mm disc diameter is only 30 mm. 35 mm
A professional tool is equipped with discs with a diameter of 180 and 230 mm, the second is the undisputed leader. With an increase in the size of the nozzle, the machine becomes much heavier (its weight reaches 3.54 kg), but it will cope with any work.
Using different types of attachments, you can not only cut materials, but also clean x, thin sections and polishers:
- A disc with Velcro is designed for polishing stone, wood: a polishing disc or emery is attached to the pad with Velcro; they are highly specialized, each designed for a specific material;
- A diamond wheel for grinding is used to polish granite and marble;
- Using brush attachments with steel or brass bristles, they clean off rust and old paint;
- Flap wheels are conveniently thinned wooden surfaces. The disc is made of several layers of sandpaper superimposed on each other.
Choosing an angle grinder for the home: what parameters are important for a home craftsman?
Angle grinder is commonly called an angle grinder, with which you can cut and grind a variety of materials: metals and concrete, ceramic and silicate bricks, natural and artificial stone, ceramic tiles.
Having such a tool is necessary Not only for professionals; in the household, he will also become an indispensable assistant. Choosing between a household and a professional model, you need to accurately determine the scope of work, since the former are designed for occasional use in the interval of 30-40 minutes, and the latter are able to work all day.
They are equipped with various additional devices for comfortable and safe work, but for minor jobs, it is impractical to purchase expensive equipment. What parameters should you focus on when buying an angle grinder??
The content of the article
Number of handles
The power of one-handed grinders does NOT exceed 1.5 kW, around no more than 150 mm. Their advantage is their short length, which makes it easier to work in hard-to-reach places. Two-handed ones are more powerful. up to 2-2.5 kW and heavier: therefore it is more convenient and safer to hold an angle grinder by 2 handles.
In the gearbox housing, manufacturers make at least two holes for an additional handle: two lateral and one upper are enough for any manipulations. Adjustment of the main handle allows you to choose the most comfortable working position. Some models are equipped with a vibration-damping handle, it is much more comfortable to work with it.
Additional handle attachment points
Additional options
Any additional feature entails an increase in cost, but some are quite difficult to do without.
Inrush current limiting device. provides a smooth increase in the load on the motor winding, preventing shock. Accuracy is improved, and no scuffs appear.
Maintaining a constant speed. in this case, the resistance of the workpiece is compensated, which allows you to maintain an optimal cutting speed.
Automatic balancing of discs. prevents the appearance of vibration as a result of uneven wear of the discs, due to this, operations are performed accurately, and the engine resource increases.
Motor overload protection. forcibly turns off the current in case of overload.
Secondary start protection system. triggers when an unplanned power outage occurs, because the tool often remains off, which is fraught with injury or material damage. With this device, the angle grinder will NOT turn on by pressing the start button again.
Perhaps many functions should not be in demand by a home craftsman, so there is no point in overpaying for them.
Tips for choosing a blade size
The diameter of the disc is the key factor that determines the area of work performed by the tool. It is worth noting that the rim for the wheels has a standard size of 22.2 mm. But, the larger the diameter of the cutting wheel, the higher the rotational speed and power of the angle grinder. The minimum diameter is 115 mm, the maximum possible is 230 mm.
The diameter of the disc is selected depending on the thickness to be cut. Proceeding from the fact that not all, but only the part of the circle protruding beyond the limits of the tool, can be used as a working one, it is necessary to pay attention to the size of the body. For example, if the case is about 60 mm wide, then when using a 125 mm disc, it is easy to understand that only half of its surface will work. That is, it will be possible to cut through material that is not more than 35 mm thick, but in reality it is even less. 30 mm. After a while, the cutting surface of the disc will wear off, which will significantly reduce this figure. With the help of such simple calculations, the required disk size is selected. But it is strongly not recommended to use circles with a larger diameter than allowed by technical documentation.
To make it easier for you to navigate, let’s take a closer look at the types of grinders, Based on the size of the disc:
After analyzing the five possible sizes of this tool, it is clear that each has its own advantages and disadvantages. If you are engaged in construction work at a professional level, then the best solution for you would be to purchase two angle grinders. Small. 125 mm for precision work and medium. 180 mm. If you have to renovate or build, then a 150 or 180 mm tool will do.
Gasoline angle grinder
This type of grinder is clearly distinguished by its appearance. Their body is large. It houses a fuel tank and an internal combustion engine. Due to its large size, the tool is equipped with a massive grip frame for easy holding and an auxiliary handle. Gasoline angle grinders are equipped with large diameter discs and are used for cutting concrete and iron in places with no access to the electrical network. This tool has an increased noise level due to the nature of the engine. Work must be carried out using protective ear protection.
The advantages of THESE models are as follows:
- Increased power and increased disc diameter;
- Fast cutting of large objects. pipes, profiles, concrete products;
- Autonomous work thanks to the gasoline engine;
- Work can be performed continuously with regular refueling of the fuel tank;
- The presence of a stand that allows you to use the angle grinder as a full-fledged cutting machine.
Disadvantages of gasoline grinders:
- Additional costs associated with the purchase of fuel;
- High noise level during operation;
- Work only with nozzles of large diameters;
- Due to the large dimensions of the tool, it is not always possible to reach the cutting area in hard-to-reach places;
- In order to avoid overheating of the engine, regular breaks in operation are required until complete cooling;
- High price.
How to choose an angle grinder for your home: 7 tips for choosing an angle grinder
There are categories of hand tools that you just can’t do without. This is the type of angle grinder (angle grinder) or “angle grinder”, as everyone used to call it. Whether it’s minor home repairs or construction work at a summer cottage, self-laying tiles or sanding wooden elements. a well-chosen type of angle grinder will cope with it all. In this article we will give 7 competent tips for choosing an angle grinder for your home, consider the pricing policy and recommend trusted manufacturers.
Main characteristics of the tool
When you have decided exactly what size of tool you need, you can proceed to the selection according to the following parameters:
Corded angle grinder
The most common type is 220V. They have the ability to use discs of various diameters. It is advisable to use them in confined spaces where there is free access to the network or in areas equipped with outlets. This is the best option for use in an apartment or in the country. It is the network tool that professional electricians, plumbers and tiling workers use. Depending on the power, both professional models and more simple ones are distinguished.
The corded angle grinder offers the following advantages:
- Have a high rotation speed;
- Are powerful but economical at the same time;
- For ease of use, there are several options for the dimensions of the case in accordance with the discs of different diameters;
- Affordable pricing policy;
- Relatively light weight;
- A variety of attachments that can be used with a certain model;
- Long service life with proper use.
The disadvantages include:
- Limited use due to volatility;
- The power cord during operation can interfere with the process and create inconveniences;
- Interruptions and instability of the tool can be observed in the event of a fall
- Mains voltage.
Cordless angle grinder
Their appearance and body structure has a characteristic difference from network models. At the end of the tool there is a large compartment for holding batteries. These angle grinders are available in modest sizes, and their body serves as the main handle when holding. The size of disk nozzles does not have such a variety as in the previous type and lies in the range of 125-150 mm. The battery is a 18V lithium-ion battery. To work continuously for a long time with such a tool will NOT work. It is rational to use it when it is necessary to perform short-term work in an open area, far from access to power supply. For example, during the construction of a fence around the perimeter of the working area, in case of emergency opening of metal doors or work in suburban, non-electrified houses. Despite some limitations, these models have several advantages:
- High rotation speed of abrasive discs;
- Compact size of the body and the tool itself;
- For safe storage and transportation, most of these grinders are by default equipped with a case made of impact-resistant plastic. Thus, you save on the additional purchase of this item;
- Due to its low weight, it will be very convenient to work, you can make precise cutting or cutting of materials;
- Most models Equipped with a number of additional protective functions;
- The presence of an additional side handle significantly reduces the level of vibrations, which makes it possible to hold the tool more evenly.
Let’s consider the main disadvantages:
- The operating period of the tool is limited by the battery capacity;
- Not all models come with a battery. In some cases it needs to be purchased separately;
- Limited size of disks, and, therefore, a limited list of work performed;
- High price.
Pneumatic models
They have the same principle of operation and purpose as other types of grinders, but differ in their internal structure. In such models, there is no motor, and the rotation of the nozzles is provided by a powerful flow of compressed air acting on the blades inside the body. When the blades rotate, it starts here, on which the disk is attached. For operation, a valve is used, which opens the air flow to the internal channel in the body. Thanks to this structure, pneumatic angle grinders are the lightest of all types. The duration of her work is not limited and can last even a whole day. To work with such a tool, you need access to the compressor, which pumps air, or to the air network. Due to these features, the pneumatic tool is NOT used for household purposes. But these models are irreplaceable for metalworking production. Their advantages are quite significant:
- Very light weight;
- Due to the absence of a motor, overheating of the tool is impossible;
- The minimum continuous operation time is 6-8 hours. It is limited exclusively by the human factor;
- Replacement of bearings, valves and other parts will be inexpensive;
- Such models can be used in high humidity conditions without a single risk;
- High speed;
- The operation of the instrument is absolutely silent. Sound appears only at the moment of contact with the treated surface.
There are only two disadvantages:
- High price;
- The need for additional equipment that will ensure the performance of the tool.
Summarize. For using an angle grinder at home, of course, a network tool will be the best type. It is more affordable and has the ability to work with different diameters of discs, and is more economical. Choosing the right size tool can handle a ton of tasks. However, if you plan to build a country house or long-term repairs at summer cottages, you should think about purchasing stand-alone models that can cut both reinforcement and concrete blocks. The choice of the type of food directly depends on the upcoming work.
Principle of operation and scope
An angle grinder is an electric hand tool designed to cut, grind and grind materials such as various types of stone, including concrete, metal, wood, and others. The device of the angle grinder is NOT particularly complex. However, it is necessary to be guided in this matter in order to be able to carry out repairs or preventive cleaning on their own. The sturdy plastic case contains such basic elements as:
- Wheel that regulates the speed;
- Engine;
- Trigger button
- Body;
- Drive quick swap button:
- Safety clutch;
- Protective cover;
- Working disk clamp nut;
- Reducer housing;
The principle of operation itself is reduced to the transformation of the torque, which comes from the spindle connected to the motor by means of a gear transmission. It is to the spindle that various attachments are attached that are needed for a particular type of work. The body of the tool is made of high-strength plastic, which can withstand impacts. Simple Using different types of attachments, or rather, different types of abrasive wheels, you can perform completely different tasks, which significantly increases the scope of this tool.
Angle grinder is used when necessary:
- Trim or cut out the tiles;
- Cut metal sheets or rods;
- Cut water pipes in a brick or concrete wall for laying electrical wiring or water pipes;
- Remove rust from the car body or a layer of old paint;
- Sand wood or metal surfaces to a high degree of smoothness;
- Clean welded seams;
- Blunt sharp edges with chamfers.
Types of grinders
The whole variety of this tool can be ordered according to the type of food. Although most of this tool, approximately 95%, is electrical, there are four types of power sources.
How to choose an angle grinder for your home?
Modern power tools have greatly facilitated the work of both professional builders and the work of men around the house. So, for example, before, in order to make water pipes in the walls, cut off a piece of metal pipe, concrete, stone, remove paint or even polish the surface, it was necessary to spend a lot of time and effort. And today, it is enough to simply purchase such a useful thing as an angle grinder or, simply, an angle grinder, and easily fulfill these and many other household needs.
Selection of angle grinder
When choosing an angle grinder, first of all, you should pay attention to the following characteristics:
Electric power of the grinder
The electrical power of the grinder is the basis for its productivity. So, among modern grinders, there are models whose power varies from 0.5 kW to 2.7 kW. If you need an angle grinder solely to cut or grind something from time to time, then a model with a power of 0.8-1.0 kW will be enough for you. And for those craftsmen who plan to use an angle grinder quite often and for cutting, for example, concrete, it is better to play it safe to purchase a more powerful unit. From 1.5-1.7 kW.
Angle grinder device
The device of an angle grinder is relatively simple. The main part of the tool is its body, inside which there is an electric motor. Various attachments, which are necessary for carrying out certain works, are attached to a rotating spindle connected to an angle grinder motor through a gear transmission. But despite the rather simple design of the tool for optimal performance of work with its help, it is necessary to choose the right angle grinder. And for this, in turn, you need to know some of the features of this power tool, which must be taken into account when choosing an angle grinder.
The angle grinder is a handheld electric tool designed for cutting, cleaning and grinding a range of hard materials, which include various metals, as well as concrete and stone surfaces.
They began to call the angle grinder “angle grinder” after the first models of this power tool were produced and imported to the countries of the Soviet Union from Bulgaria.
Spindle speed
The spindle speed of the grinder is the value that shows the number of revolutions of the nozzle installed on the spindle per minute.
The rotation speed ranges from 2800 to 11000 rpm. Note that a higher rotation speed is characteristic for discs with a smaller diameter, and a lower one. for a disc with a larger diameter. So, discs with a diameter of 115 mm are mainly used at a speed of 11000 rpm. / Min., A discs with a diameter of 200-230 mm. At speeds up to 6600 rpm. / min. Exceeding the permissible rotational speed can result in disc destruction, failure of the entire tool, or even injury to the operator.
Most grinders allow you to adjust the spindle speed depending on the size of the disc used. For this, a special regulator is used, through which an increase or decrease in speed of the angle grinder occurs.
Disc diameter angle grinder
When working with an angle grinder, you should also pay attention to the diameter of the cutting disc (or grinding wheel), since it depends on it the thickness of the material for which you can use this or that tool.
The cutting discs for the angle grinder have a diameter of 11.5 to 23 cm. The following feature is observed here: the more power the angle grinder has, the larger discs it can work with. That is, the maximum wheel diameter is directly proportional to the power of the grinder. Note that the most popular are angle grinders, the disc diameter of which is 125 mm. Such a hand grinder. The most suitable option for most household needs.
Ergonomics of the angle grinder
Since the grinder is a hand tool, its weight and ease of use play not the least role when choosing a tool.
You will control the cutting or grinding process with the handle-holder, therefore, when choosing an angle grinder, special attention should be paid to its convenience. And since the handle will also take up the bulk of the vibration, manufacturers often make it anti-vibration. Advises Pay attention to such models.
The weight of an angle grinder is often directly proportional to its power: a model with a power of 0.7-0.8 kW has a weight of about 1.5-2.0 kg, for 1.0-1.4 kW. about 2.2-3 kg, more than 1.5 kW. 3.5 kg and more.
Availability of a soft start system
The angle grinder is a fairly powerful power tool, therefore, when switched on, the mains can be subjected to extremely heavy loads. A soft starter helps to avoid such peak loads. over, the smooth start-up of the grinder significantly reduces the physical wear of parts and the likelihood of damage to the material being processed. With such a start, the likelihood of injury is also reduced, since the mechanical jerk when turned on is eliminated.
Safety when working with an angle grinder
Working with an angle grinder requires the operator to take all necessary safety measures, as well as attention and caution. But besides this, there are a number of necessary accessories.
Each angle grinder must be equipped with a protective cover, which during operation protects the operator from sparks, dust and other small particles. The main protective element for the angle grinder is the cover.
When working with a grinder Gloves, goggles and earmuffs are also useful.
Important conditions when working with an angle grinder
Regardless of the experience, professionalism and complexity of the upcoming work, the master is obliged to comply with safety rules when working with an angle grinder.
- DO NOT remove the guard from the tool. it protects the operator from splinters in the event of a damaged blade, as well as from sanding and sawing products flying off.
- Use personal protective equipment. goggles (mask), respirator, heavy gloves, work clothes and shoes.
- Only use discs of suitable dimensions and properties for the angle grinder.
- DO NOT use the tool for other purposes.
Choosing a professional angle grinder
In this section you will learn about the fundamental additions to the functionality of the angle grinder. They will help you understand which angle grinder to choose, which add-ons will be useful for your work, and which will be superfluous.
Handles. there can be two of them in professional models. The more elements to hold the tool, the more accurate and safe its work.
Soft start of the motor. the speed of rotation of the disk increases smoothly, without sudden “jerks” for the safety of engine elements.
Self-balancing disc. Reduces the vibration of the tool that occurs when using an unevenly worn disc.
Anti-vibration coating. same goal, vibration reduction. Coating is applied to body parts, main or auxiliary handle.
Power (rotation speed) control. it can be automatic and manual. Automatic adds value to the tool, but extends the operating life.
Dust protection prevents abrasive particles, dust and chips from entering the system. In SEPARATE models, you can additionally connect a construction vacuum cleaner, then the operator’s organs will be safe, and the workplace will be clean and tidy.
Fixation of the main tool button. relevant for long-term work, the operator presses the start button once, and he does not need to hold it stably to rotate the disk.
Power outage in the event of a sudden power outage. This will protect the workplace when the tool is turned on and will ensure the safety of the device’s motor elements. With an emergency power off, the angle grinder also automatically shuts off.
Anti-jamming.
Features of household and professional grinders
As a rule, the choice of an angle grinder for home use does NOT cause difficulties, because they differ in minimal characteristics:
- Affordable price (up to 1000 UAH)
- Lightweight body, weight up to 2.5 kg
- Do not create overloads in the power grid;
- Minimum power 500-900 W
- The minimum size of removable discs 115. 125 mm for simple work;
- The optimal duration of one session of work is 15 minutes.
Professional angle grinders have a longer resource, as well as a number of additional functions and characteristics:
- The power of the angle grinder reaches 2.5 kW;
- Disc sizes 150, 180 and 230 mm;
- Session duration 30 minutes or more, depending on the model.
If the master is just starting to delve into the details of a professional tool, it will be more difficult for him to determine which angle grinder is better and choose a model with optimal parameters.
How to choose the right angle grinder for your home
Whatever you call an angle grinder, it will still remain an indispensable mechanical tool for a master for most areas:
- Car service;
- Construction of houses and buildings;
- Indoor renovation;
- Repair and replacement of pipes, heating equipment;
- Locksmith works. manufacture of structures, manufacture of metal products.
The invaluable help that a standard angle grinder provides is known to every craftsman. After all, an angle grinder with correctly selected attachments is a versatile set of functions that perform at least 5 different tasks.
In this article we will get acquainted with the types of angle grinder and selection criteria. Find out how to choose an angle grinder for your home and daily locksmiths.
Brief theoretical information in an angle grinder: full name, main differences, types
The types of grinders are divided into just two categories:
- Household;
- Professional.
As a rule, household ones are the simplest models with a minimum of functions and low performance. Professional. on the contrary, have a multifunctional set of characteristics and differ in power limits.
The principle of operation of the angle grinder is based on the rotation of the rotor of the motor, which works when connected to electricity.
Depending on the disc installed on the angle grinder, the grinder differs in the field of application:
- For cutting sheet metal;
- For cleaning surfaces from corrosion, old coatings;
- For cleaning welded seams;
- For cutting concrete;
- For cutting stone;
- For cutting wood.
In addition, the angle grinder is used for cutting pipes, metal profiles, ceramic tiles.
Types of attachments for an angle grinder: dimensions, material, purpose
The tool’s capabilities depend on which attachment you install on the grinder. For a standard angle grinder, you can purchase attachments for grinding and cutting materials such as:
Abrasive cutting discs. designed for cutting and, depending on the type of disc, can cut metal, stone, concrete, wood, ceramic tiles.
Wire brush based roughing discs are suitable for removing old paint, rust, etc.
Grinding. flap or emery for fine cleaning, grinding.
Polishing. textile, fur, felt, suitable for polishing after painting, to add shine.
Sharpeners. they are used for quick and elementary sharpening of cutting tools, blades.
Conclusions on the article
For regular work, on the contrary, consult with a specialist in your field. Find out from him how to choose an angle grinder and what functions of an angle grinder are most useful for the job. A high-quality and multifunctional professional tool requires a larger investment, but at the same time, it ensures labor efficiency.