Tip 1: Rules for choosing an angle grinder

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Tip 1: Rules for choosing an angle grinder

During repair and construction work oftenIt is necessary to use an angular grinding machine, called "Bulgarian" in common parlance. With this tool it is convenient to remove traces of rust, remove old paint and varnish, cut various materials. In order for the machine to function properly, it must be properly selected.

Angle grinders

Known to almost every home master"Bulgarian" is called an angle grinder because its working shaft is at right angles to the plane of the engine, and not because it is convenient to handle complex angles with such a tool. Such technical systems are divided into several types, differing in functionality and purpose. Traditional hand-made "Bulgarian" - only one of the most common electric tools of this family. Angle grinders are successfully used for cutting and processing of metal parts, for grinding and more fine polishing of surfaces. Separate types of cutting discs allow cutting stone, brick, ceramic tile and other solid materials. The grinding machine can also remove metal defects: smooth welds and rips, clean rust and so on.

Addition in the form of a wire brush will enable you to quickly and without much effort to clean off the old varnish and paint from different surfaces.

One of the main performance angulargrinding machine - the power it consumes. High performance is characteristic of a professional tool that does not heat up so much and allows the use of nozzles of a significantly larger diameter. This is important in the manufacture of complex works, because the larger the diameter of the cutting blade, the more the incision is made by the machine.

Grinding machine: domestic or professional?

The very first question that arises in choosinggrinders: which model is preferable - household or professional? Here you should proceed from the goals that you pursue, as well as the needs for such an instrument. Household corner grinders are most often not used regularly, but only as necessary. They have not too much power and a relatively low number of revolutions. The productivity of a household tool is also not very high, and after a short work such a machine requires at least 15 minutes of rest.

Work household grinding machine can be no more than 3-4 hours a day.

To the dignity of machines of everyday type can be attributedtheir reasonable price, compactness and lightness. But the number of additional functions of a home appliance is limited. But if you plan to use a corner grinder exclusively for simple work at the dacha or in the house, such an electric tool will be the best and optimal choice. For continuous work for a long time you will need a professional model. The design of this grinding machine takes into account the requirements of maximum productivity. The professional tool has more weight and power, and also differs in more substantial sizes. The reliability of machine nodes of this type is much higher, and the number of functions is different.

High-quality materials used in the manufacture of professional grinders allow using them for intensive work in several shifts.

Types of grinding machines: features of choice

In the manufacture of construction and finishing worksA number of special types of angle grinders are widely used: belt, vibratory, eccentric. Each of the models has its advantages and disadvantages, as well as the field of application. Belt grinders make it possible to produce coarse grinding of fairly flat surfaces. They are often used for interior decoration of premises, when it is required to process large areas of flat surfaces. Distinguished tape devices are very high performance, but not too high quality processing of the product. The field of application of such a machine is the removal of old coatings, grinding of impregnated surfaces, processing of window frames and doors. Vibrating grinding machines are designed for fine processing and polishing of flat surfaces. They are good at grinding metal, plastic, wood and some composite materials. Machines of this type have a sole of a rectangular shape, performing reciprocal movements of small amplitude. Separate varieties make it possible to process hard-to-reach places, for example, small pieces of furniture, door frames or stair rails. Eccentric grinders have a special eccentric, which allows the working part of the device to perform both reciprocating and circular motions simultaneously. From other types of machines, such models are characterized by a higher efficiency of surface treatment. The best results the eccentric machine will show on curved surfaces and at finishing polishing. An additional device is convenient for the machine to remove dust. Consider when choosing that it is eccentric machines or vibration-type devices that are set to a low speed for the grinding of plastic products. A small number of turns should be used and when finishing the varnished surface, which is very sensitive to high temperatures.

Tip 2: How to choose an ESM

Angle Grinder (USM) in the people affectionately called a Bulgarian. It is used for cutting various materials and grinding and polishing surfaces. Approach to the choice of any construction tool should be very carefully, and the Bulgarian is no exception.

You will need

money, a building store

Instructions

Decide if you need a household orprofessional. The main difference between these two types is that household USM should be switched off every 10-15 minutes and rest. Use them can only 2-3 hours a day, and a professional device is able to work up to 8 hours. Most often for domestic use choose exactly household USM, but here everyone decides for himself.

Please note that the grinding wheel of the grinder candiffer in diameter and in the type of materials that it is capable of processing. Look at the technical passport, it should be written, what is the maximum diameter of the disk installed on this UWB. If you are planning a large amount of work, then take the Bulgarian with a larger disc.

Remember that a large working disk requireshigh power. Therefore, when buying a model with a large disc, choose a more powerful Bulgarian. Powerful USM does not heat up very much during operation. The large diameter of the disc allows a deeper cut.

Check if the tool has a smoothspeed adjustment. This function is especially useful for grinding of a wide variety of materials. Some ears are equipped with speed control systems for spindles. Remember - for cutting, the speed of rotation of the disks is about 80 m / s. In this case, the large diameter of the disk assumes a lower speed of rotation and vice versa, the smaller the disk, the greater the speed.

There is a huge choice in the construction marketBulgarians. When choosing the USM, give preference to well-known firms. The tools of reputable manufacturers are subject to serious quality control and are equipped with proven protective elements. In addition, the UWB of proven firms are made using ergonomic requirements. If something happens to the tool, you can always contact the service.

Tip 3: Than to cut metal without heating

To make a product from metal,apply a variety of methods of processing. One of them is metal cutting. The blanks and sheets are divided into parts not only with the use of heating, but also with other technological methods. The choice of the type of cutting is determined by the degree of complexity of the finished product and the availability of a suitable tool.

Methods of cutting metal

When cutting metal, it is divided intoparts at a predetermined location. One of the most common methods of cutting today involves the heat treatment of the cutting site, that is, the heating of the workpiece. But mechanical, hydroabrasive and laser action on metal is widely used. Such cutting methods do not require exposure to a workpiece with a glowing gas jet or a burner flame. The metal is separated without heating. Methods of such cutting have not only advantages, but also drawbacks, which, however, can be compensated for by complex types of material processing.

Mechanical cutting of metal

The simplest and most common is not onlyin everyday life, but also in production, the method of separating metal blanks into parts - cutting mechanically. For this purpose, a metal hacksaw, a band saw, a milling cutter, an angle grinder and so on are used. In industrial production, special purpose machines are used, on which it is convenient and quick to cut mechanically metal sheets, pipes, profile and some other semi-finished products from pure metals and their alloys. The disadvantage of the mechanical method lies in its relatively low productivity. The working part of the tool used for such cutting is usually not too durable, it is easily dull and needs frequent replacement.

Difficulties arise also if it is required to cut out a metal figure of a rather complex shape mechanically.

Laser cutting of metal

One of the modern methods of cutting involvesuse of a narrow laser beam. With such a beam, it is possible to separate metals and various alloys from them, obtaining an extremely narrow cut while maintaining the minimum thermal impact in the work area. The edges of the processed billet are thus very clean and have practically no deformation, without which it is difficult to do without mechanical cutting. The laser beam has a high energy, which guarantees the maximum possible productivity of the work. It is quite easy to operate the cutting device. The use of a laser makes it possible to manufacture details of a very complex, and sometimes even very intricate form.

Waterjet cutting of metal

Cutting metal by hydroabrasive method - one ofThe most effective and accurate methods used to separate blanks without heating. On the metal being processed, a jet consisting of a mixture of sand and water is affected.

The mixture is fed into the cutting zone under very high pressure through a special nozzle, which looks like a narrow nozzle.

And in this case the metal is not exposedhigh temperature, and therefore not deformed. The method is good because it does not require the processing of the edges of the product. A significant disadvantage of such treatment is a relatively high cost. It is not recommended to use the hydroabrasive method, if the product can be sensitive to corrosion.