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Types of grinders

What is a grinder? This is a power tool, the working body of which is an abrasive wheel rotating at high speed. The disc is placed in a plane parallel to the tool axis. LBM is used for cutting metal structures, stone, ceramic products. It is also used for removing paint, cleaning surfaces of various materials, a layer of corrosion, polishing.

The machine is widely used in construction for cutting fittings, pipes, cutting grooves for wires, arches for windows, doors, and other tasks.

Varieties of grinders are divided into a number of categories:

• LBM types by size. Small ones are about 27 cm long, designed for 115-125 mm discs, weight does not exceed 2 kg. Medium in length 35 cm, use circles 150-180 mm, weigh 2-4 kg. The most versatile. Large ones reach 40 cm, discs are placed on them 210-230 mm, weight is about 6-7 kg.
• By appointment... Household and professional types of grinders differ in terms of continuous use. An amateur instrument is designed for relatively rare use. It lasts continuously for 15 minutes, after which it must be turned off before the engine and gearbox cool down. Professional performance is adapted for long-term continuous work. It has a reinforced casing, improved ventilation. But such devices are heavier, much more expensive. Semi-professional options have intermediate characteristics. It is better to choose such a model for your home than a professional one.
• By type of food... The electric angle grinder can be AC ​​or cordless. It is wiser for an amateur to take a network one - they are cheaper, more powerful. The rechargeable battery can be used where there is no 220 V. But this is needed more by specialists. There are also gasoline and pneumatic units. In everyday life, they are extremely rare.
• By the number of handles... In models with a 115, 125 mm disc, one handle is usually installed. More powerful variants are equipped with an additional side stick. It can have from 1 to 3 positions, which are adjustable thanks to the threaded connection.

How to choose the size of an angle grinder disc

The main parameter of the grinder is the diameter of the disc with which it works. The ability to perform various works directly depends on the size of the circle. Also, the equipment determines the size of the angle grinder - the larger the working body, the larger and heavier the equipment itself.

For domestic purposes, different diameters are used:

• 115... The smallest circle for a grinder. They are maximum able to saw through metal up to 25 mm. Designed only for infrequent metal work during repairs.
• 125... The most popular grinder wheels. Cutting depth - up to 4 cm. Versatile enough to work with many materials. Convenient for metal cutting. LBM under the disk are lightweight, compact.
• 150... Such a cutting disc is considered universal. Suitable for cutting steel pipes, profiles, sheets. Can be used for work on stone, brick, concrete. It is better to choose this type of grinder for housework, for a summer residence, a garage. The good side is optimal performance while being lightweight and compact.

180. Equipment for those who often work as a grinder. Has high performance. Perfectly cuts stone. It is correct to take one for stone work. The machine can serve both semi-professional and professional.

230. They are inconvenient for household purposes. The kerf is given up to 70 mm

Professional machines that require careful handling. They are distinguished by good performance, redundant for the amateur

Moreover, such equipment is expensive and heavy.

Peculiarities

The variable speed angle grinder is a versatile and multifunctional tool that makes it easy to tackle any task in construction and renovation. The main difference between such angle grinders is the ability to independently set the speed of rotation of the disk, depending on the type of material being processed. Manufacturers produce a device with an electric motor, the power of which can range from 500 to 1500 watts. For cutting workpieces, you can choose machines with an average performance of 800 W, but if you plan to carry out grinding, then it is recommended to give preference to more powerful models, since the contact area with the surface of the material being processed is larger in this case.

LBM with speed control is an absolutely safe device to use, since all models are equipped with a full range of protective systems that exclude injury. Let's list the main ones.

• Soft start device. It is responsible for the smooth operation of the tool after pressing the start button. This device can also act as an inrush current limiter, which extends the life of the device.
• Safety clutch. In the event that, when processing material, the disc of an angle grinder begins to "bite" or wedge, this device triggers an emergency stop.
• Emergency brake. When machining hard material, the tool can twist and pull out of the hand. The brake helps to stop the disc rotation in 3 seconds.

• Coil impregnation with a special compound. Since the cutting and grinding of the material is accompanied by the appearance of abrasive dust, its penetration into the device is prevented by additional processing of the coil with a protective layer. This avoids short circuit problems.
• Heat dissipating slots. Protect the device from overheating during intensive work.
• Balancing system. The wheels of the machine may be ground unevenly, after which trembling and beating of the machine may occur during the processing of workpieces. Special automatic balancing helps to smooth the work.
• Overload fuse. When the cutting part heats up to a temperature above 160 degrees, the automatic system is triggered, and the rotation speed of the disc first decreases to 200 rpm, then stops completely.

LBM with a speed controller weigh from 2 to 5 kg, their performance depends on the diameter of the disc and the number of revolutions. Mini-models are very popular among craftsmen, which are suitable for working with 115 and 125 mm wheels. Their speed ranges from 10,000 to 11,000 rpm. Angle grinders with 115 mm discs are generally used for cutting material up to 28 mm thick and are well suited for sanding wood, tiles, porcelain and glass. Devices with 125 mm discs are considered the most popular, as they perfectly cope with grinding the surface of any material and cutting parts with a thickness of 30 mm. If it is necessary to cut and grind steel pipes, bricks and concrete, then it is recommended to use a device with a circle of 150 mm, while metal processing should be carried out at high speeds, and stone at lower speeds.

The fastening of the cutting disc in the grinder with speed control is carried out using a spindle stopper and a protective key, in some models there is also a self-clamping system. Additionally, manufacturers also equip the tool with a casing that protects the craftsman from dust, sparks in the eyes and breaking the circle on the go.

Models and their characteristics

An overview of the angle grinder can be started with the Makita 9015 B. This device is intended for home use. The designers made sure that it successfully copes with all the common tasks. As befits a leading Japanese corporation, a modern design approach is used.Since an additional handle is provided, it will be easy for even non-professionals to use the tool.

The protection against dust particles is high enough to be able to cut and grind the concrete with ease. The power of the model reaches 1050 W, despite its compact dimensions. The basic equipment allows you to perform a wide range of functions without purchasing additional tools. Therefore, we can confidently say that if this is not the best grinder in the budget category, then it is definitely ahead of the Chinese battery models. The only weakness turns out to be a rather significant mass - 2.4 kg.

Those who need a device balanced in terms of weight and practical capabilities can pay attention to the 9528NB version. This grinder, judging by the reviews, is as comfortable as possible when working.

Its robust body is guaranteed to withstand mechanical deformations. The device works stably at a wide variety of temperatures. But it is still worth interrupting periodically in order to extend the total operating time.

The model can handle 125 mm discs. Spindle fixation is provided. The 9528NB weighs only 1.4 kg. Therefore, it is easy to use the device even for people who are not distinguished by great physical strength. The only problem is that the motor cannot deliver more than 750 watts. GA5030 is a universal unit. He confidently copes with work that does not require significant loads. Judging by the reviews, this angle grinder is capable of:

• sand various surfaces;
• cut and clean thin metal;
• cut ceramic tiles to exact dimensions;
• process wood or plastic.

Users note that it is convenient to work even with one hand. This significantly increases the degree of freedom of the master. The designers managed to prevent the occurrence of vibrations during work. The GA5030 grinder is relatively light - 1.4 kg, compatible with 12.5 cm discs. It is a reliable networked machine with an auxiliary handle. But we must also take into account the limited power, which is only 720 watts. For large surfaces, the GA7050 is much better suited for its ergonomic housing. The operators do not experience serious inconvenience during long-term operation. However, the power of 2000 W can significantly reduce the time of most manipulations. Additional reduction in fatigue is achieved with a special handle.

The positive aspects of the design can be considered:

• rigid fastening of the spindle;
• frequency of revolutions up to 1800 per minute;
• the ability to limit the starting current.

Makita grinders can be used with both carbon and graphite brushes. The exact information about this is always indicated in the instructions. When replacing electric motor armatures, use only original factory spare parts. If you need to purchase a device with a 230 mm disc, you should give preference to the GA9010C version. On this device, the installation and displacement of the casing is possible without auxiliary tools, completely manually.

Also, the manufacturer has equipped the GA9010C angle grinder with an electronic system that adjusts the speed. The firm claims that it is one of the best models in terms of power-to-weight ratio. But if you need to buy a 150 mm grinder with speed control, the 9566C / CV model is much better suited. The device weighing 2.4 kg is reliably protected from starting jerks.

The brushes turn off automatically. The protective cover can be repositioned without aids. During continuous operation, the current consumption per hour reaches 1400 W. If a wireless version is required, the 9500DW is worth choosing. This angle grinder removes any burrs from the metal quite well, weighs exactly 1 kg, and can work up to 10 minutes with a full battery charge.

The best grinders with a disc diameter of up to 180 mm

These tools are considered powerful and are suitable for both domestic and professional work.Due to the large diameter of the circle, angle grinders are quite productive, they work continuously and easily cope with complex tasks. In this category, there are two nominees that have become the best, thanks to user reviews.

Interskol UShM-150/1300

Reliable two-hand sander from Interskol is liked by many craftsmen. It is quite powerful, capable of over 8000 rpm, suitable for grinding, abrasive cutting and sanding, therefore it is considered universal. The angle grinder works continuously, the additional handle can be set in three positions, which is very convenient. Thanks to the spindle lock, you can easily change accessories that are easy to find in stores. Separately, buyers praise the good build quality of Interskol and the reliability of the design.

Dignity

• Simple brush replacement mechanism;
• The metal housing of the gearbox removes heat;
• Affordable and inexpensive consumables;
• Does not overheat;
• Works quietly.

disadvantages

• Short and oak cord;
• Fixed main handle.

Users note the inconvenience of gripping the main handle when cutting. Since the switch must be kept constantly, and it is located on top, it is rather awkward to hold the angle grinder in an upright position.

Whirlwind UShM-150/1300

Hardy and reliable enough Bulgarian. It easily handles metal products, has a power of 1300 W, and thanks to the three-position handle it is convenient to work with it. This model stands out for its stylish, modern look. The slim, balanced body blends seamlessly into a handle that can be gripped even with one hand. The start button is located precisely on the handle, it has protection against accidental pressing, plus it does not need to be constantly clamped in operation, the start is fixed. The brushes are strong enough and do not need to be replaced for a long time.

Dignity

• Enhanced dust protection;
• Sturdy plastic case;
• Minimal vibrations;
• Cast reducer;
• Easy to use.

disadvantages

• Reduces RPM significantly under load;
• A sharp start.

In general, buyers praise this model, referring it to the category of the best. It is quite functional and suitable for cutting stone and concrete.

Best Electric Chain Saws

Which grinder is better to buy

To understand which grinder is better to buy for home, novice craftsmen begin to compare the parameters, prices and appearance of the tool, which is not entirely correct

Experts recommend paying attention to technical features such as power, number of revolutions and disc diameter, they determine the purpose of angle grinders. It is also worth taking a closer look at the manufacturer's warranties, the dimensions of the device, after reading the recommendations for use.

By neglecting them, the buyer risks reducing the service life of the grinder, disrupting the warranty period. The rating suggests considering the grinders that have become leaders in the TOP categories:

• MilitaryAG600 stands out against the background of grinders with discs up to 125 mm. It is very powerful, has a metal protective cover, a long power cord and an easy start option that ensures a smooth start to work.
• Vortex UShM-150/1300 is perfect for cutting medium-sized materials.
• HammerUSM 2400 D is suitable for long-term work, it has full protection against dust, overheating.
• The BortBWS-905-R is considered a versatile device suitable for home or garage needs.
• Bosch GWS 18-125 V-LI is suitable in case there is no power supply nearby. The grinder has two powerful batteries.

Each tool presented in the rating deserves special attention, as it has its own advantages and disadvantages. TOP 2020 singled out the leaders thanks to objective assessments of experts, testing and feedback from buyers themselves.

Operation and maintenance

Features of the use of angle grinders depend on the scope of the units. As for the household tool, it is not recommended for heavy loads, in addition, such mechanisms, most often, have low power.As a rule, after 15–20 minutes of working with the grinder, the tool should be put aside for some time so that it does not overheat. Professional grinders can work several times longer, since their power and built-in cooling systems will reduce the risk of overloading mechanisms.

The general rules for all devices during operation are the following points.

Before starting the machine, you should make sure that the cutting disc is in good working order, check the reliability of its fixation. Particularly noteworthy is the recessed center detail. If defects are found, the consumable must be changed, since the operation of the "grinder" with a faulty wheel can lead to jamming of the entire system.

• It is also necessary to regularly check the reliability of fixing all fasteners in the mechanism and housing, to inspect the mechanisms on the bearings.
• The design of machines with carbon brushes requires a special approach to the maintenance and operation of brush holders. As a rule, this part has a certain period of operation, so you can roughly track when a replacement should be carried out in the mechanism. The brushless model does not require solving such problems during operation and maintenance.

In the next video you will find a detailed review of the Hitachi G13VE grinder.

Why do you need a smooth start and speed control on angle grinders

On drills and screwdrivers with similar capabilities, the rotation control mechanism has a trigger design. The peculiarities of the operation of grinders do not allow the use of such devices, since the shape of the tool implies a full palm girth. In addition, safety requirements prohibit changing the set rotational speed of the disc of a working angle grinder.

LBM with the function of adjusting the speed and gradual start are distinguished by high reliability of performance due to the reduction of the load on the electrical elements and the mechanical part of the tool.

An abrupt transition from a resting state to an increased speed severely wears out the gearbox, forcing it to work in overload mode. Anyone who has ever used a grinder is familiar with the feeling when it breaks out of the hands at the moment it is turned on.

The use of angle grinders with a smooth start allows you to avoid voltage dips in the network. This means that switched on household appliances will not be exposed to the risk of burnout.

Let's consider the practical benefits of the speed control function:

There is a possibility of high-quality cutting of thin sheet products made of tin or soft materials. Operating at high speeds will cause the edges of the product to melt from exposure to temperature.
Some ceramics are cut at low speeds. Otherwise, small particles may chip off on site, which spoils the appearance of the workpiece and can lead to injury.
Grinding of different materials is carried out at different speeds. The adjusting mechanism will help to select the optimal mode of operation without the risk of damage to the surface

This is especially important when polishing products with a low melting point.
The spindle speed depends on the consumables used. For example, diamond discs are operated at reduced speed to avoid overheating of the contact surface.

Conclusion

When deciding which angle grinder to choose, be guided by your own requirements

If it is important for the device to work for a long time and without failures, it is worth paying attention to all the characteristics. We described in detail how to select a model, what criteria are important in different cases, and what can be discarded in favor of saving

In addition, the review provides the characteristics of three models that will suit most amateur craftsmen:

If specialists usually know themselves what they need when choosing angle grinders, then our article will help amateurs determine the parameters that affect the high-quality operation of devices and purchase the best tool.