Features of tooling angle grinder

Few tools have such a wide range of applications, which the angle grinder possesses (in the common people “grinder”). In fact, one small machine allows you to quickly complete more than a dozen construction and repair work.

To equip angle grinders, a wide range of components is produced today, which allows you to quickly select a working part.

What tasks does the equipment for angle grinders solve?
LBM is a versatile tool that can be used for cleaning, grinding, polishing, cutting workpieces from different materials. Also, with the help of a grinder, they sharpen the tool, grind down welds and even perform milling work. All that is required for this is to choose the right discs. At the moment, the range of wheels has been significantly expanded, thanks to which they can be used to work with many materials:

There are multifunctional and highly specialized discs. However, even multifunctional wheels cannot always be used for processing absolutely all materials. Choosing the wrong wheel can damage the workpieces and even cause serious injury. Regardless of the type of disc and the model of angle grinder, work with this tool requires the utmost care.

How can grinding be done?
Although these wheels actually perform one front of work, a distinction should be made between roughing or grinding and grinding discs.

The former are intended for rough machining, and the latter are for finishing.

They can be used to process different surfaces:

Depending on the area of ​​application of the discs, their working parts differ. This can be a surface with diamond grit, brushes with metal wires or bristles, sandpaper and other abrasive materials. For rough processing of logs, thick boards or beams, round or chain circles-planers of a solid type are intended.

Choosing the right discs – grain size, sizes
When choosing wheels, it is important to take into account the landing and outer diameters, as well as the grain size. These are the main, but not the only parameters that determine whether the disk is suitable for the job or not. Thickness, radial runout and end runout are also important. However, these characteristics more affect the quality of work. And the very possibility of their implementation depends precisely on the grain size and size.

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Grain
Since you can find several editions of the grain classification on the market, it is easier to focus on a simplified way of segregating circles according to this feature. It is customary to distinguish between fine, fine, medium and coarse grain. The amount of material removed from the surface depends on this indicator. Grit is also important when cutting metal – this information will be provided in the next section.

Grit FEPA Treatment type According to state standards (GOST) Roughness of the processed surface Ra, μm

For hand tools, discs with an outer diameter of 115 to 230 mm are intended . Their thickness can be 0.8–5 mm, and the size of the landing diameter is 22.2 mm. Flap discs for grinding materials match the diameter of the maximum Velcro disc ( backing pad ) used as an adapter.

What are cut-off wheels for and why some of them are only for metal
Cut-off wheels are provided for fast cutting of hard materials. Previously, only metal was processed with their help. Today, manufacturers have supplemented their assortment with tools for cutting stone, concrete, and porcelain stoneware. The metal cutting disc must not be used to cut concrete and vice versa. This is due to the peculiarities of the materials from which different types of discs are made.

For the production of wheels for metal, electrocorundum or silicon carbide is used. The grain size of these materials varies within 5–125 in accordance with GOST 3647-80. It reflects the real cutting ability of the tool and its resource. Manufacturers use the letter “F” to denote this parameter according to the international FEPA standard. To cut different materials, you need discs with the following markings:

At the same time, the cleanliness of the treated surface largely depends on the grain size. The smaller this parameter, the cleaner the cut is. However, it is not worthwhile to focus on this indicator in all cases without exception. After all, small grain, if not used for its intended purpose, will provoke premature wear of the wheel and a burn of the treated surface. If necessary, the edges can be gently cleaned after cutting.

What are diamond discs for?
For cutting concrete, stone and hard brittle materials, diamond-coated discs are used . These circles are solid and segmented. Their area of ​​application depends on the design. Solid blades are designed for wet cutting and segmented blades for dry cutting. When working with angle grinders in a domestic environment, there is usually no way to moisten the surface to be treated, therefore, cutting tools with slots are in great demand.

Regardless of the design features of the discs, diamond chips are applied to them along the entire length of the outer diameter. It is this material that cuts hard surfaces and protects the metal base of the wheels from rapid overheating. Since diamond grit is a poor heat conductor, it additionally serves as a thermal insulating layer. Slow drive heating increases drive uptime and improves performance.

The slots in the dry cutting wheels have a damping function. However, they not only protect the cutting tool from deformation, but also additionally cool the metal by trapping air and thus providing ventilation. The slots are symmetrically positioned on the wheel, which minimizes the likelihood of vibration and wobbling. Despite thoughtful overheating protection, it is not recommended to overload solid disks. The maximum time of continuous operation is one and a half minutes. Then the instrument must be cooled for 20-30 seconds.

Segmented and solid discs can have a wavy surface. These are called turbo circles. Level differences on the metal surface provide better air circulation and increase the continuous operation time. This is especially noticeable when working with segmented disks. Such equipment overheats 3-4 times slower. Better heat dissipation not only allows the task to be completed faster, but also extends the tool life.

When choosing a diamond-coated disc, it must be borne in mind that certain types of wheels are intended for cutting different materials:

solid for work with an irrigation system – capable of cutting fragile materials: glass, ceramic tiles, marble;

It is important to choose the right disk when performing repair work on your own (chipping load-bearing walls for wiring or pipe communications). If a regular diamond-coated wheel meets metal on its way, it will quickly deteriorate. The characteristics of the disc must contain information that it is suitable for cutting reinforced concrete.

What about wood processing
Once, while working at home, in the country, in the garage there is a temptation to quickly cut boards or timber with the help of angle grinders. Everyone who takes a risk is sure that he will be carried. Not everyone succeeds in deceiving fate. Often, such experiments end with injuries of varying severity.

You cannot use a grinder for cutting or cutting wood. This equipment is not intended for such work.

The main reason for the ban is that the grinding machine does not have a stopper that will not allow it to pass the critical point. As a result, the landing zone can approach the surface of the workpiece to be processed. As a result, there is an increased risk of a snag, which can cause the angle grinder to fly out of the hands. An accident occurs in a split second, and it is impossible to predict it.

No less dangerous is the meeting of the teeth with a knot, a nail, a self-tapping screw, because immediately after contact, the grinder can twist the hands and head to the side along an unknown trajectory.

However, the persistence with which we overcome well-founded inhibitions helped to achieve our goal. Reputable brands have expanded their assortment with cutting discs for woodworking. They are specially designed for angle grinders so that cutting can be performed safely. The special feature of these discs is their design with a reduced number of teeth, which reduces the risk of sudden jerks and impacts. In addition, when working at high speeds, the teeth themselves do not burn so quickly. Such circles are presented in three modifications:

with a reduced number of teeth.

Disc for angle grinder Bosch 2608623013 1 piece 1 050 *
The blades are suitable for cutting wood with different hardness, as well as panel materials. For each type of work, it is recommended to select a separate tool. They are widely available for sale , so you can easily order a suitable wheel for working with wood.

Is it possible to put discs for circular saws on angle grinders
Conventional circular saws for cutting boards and beams have a larger landing diameter, therefore, they are incompatible with grinders. However, this ban was quickly circumvented. Folk craftsmen-Kulibin developed an adapter that allows you to install on LBM conventional saws. At the same time, the presence of an adapter does not make the tool safe – the list of risks remains the same.

To secure the cutting of timber, boards or board materials, tool manufacturers have developed compatible angle grinders. They provide a full stop for hand tools and eliminate the risk of passing a critical point. With the help of such a nozzle, you can actually assemble a lightweight analogue of a circular hand saw. It is imperfect and more dangerous than a tool specially designed for cutting wood. However, its use still significantly reduces the risk of injury.

The second name of the angle grinder attachment is the sole. It can be stationary or adjustable. The second option allows you to change the angle of inclination of the blade and the depth of cut. The adjustable sole extends the ability to safely cut wood with a grinder. However, it is not able to completely replace the circular.

Safety engineering
This compact and convenient tool, if handled ineptly and irresponsibly, is fraught with great danger. A responsible approach reduces the likelihood of injury and breakdown . Regardless of what material it is planned to work with using angle grinders, it is necessary to comply with the basic safety rules:

work in glasses, a respirator and gloves;
perform cutting and grinding with a protective casing;
if chips, cracks or other defects appear on the metal circle, you must immediately stop working with such a tool and replace it;

change disks only when the instrument is disconnected from the network;
at the first appearance of suspicious vibrations, clicks, noises, stop the operation of the angle grinder;
remain vigilant during the cutting or grinding process – the tool can jam at any time;
after the termination of work, you must wait until the disk stops completely;
use circles that are only suitable for specific work.

If additional devices are used (sole, casing, dust extraction, stand), it is necessary to make sure that these elements are securely fixed. You will also need to make sure that they do not interfere with the rotation of the disc.