Angle grinders are a very large group of power tools adapted to work with disc grinding wheels. They are divided into two large groups: small and large angle grinders. In small angle grinders, discs with external diameters of 100, 115, 125 and 150 mm are used, while in large ones - 180 and 230 mm, they are used in metalworking, mainly various types of steel, as well as construction materials such as concrete, reinforced concrete , stone, bricks, ceramics or stoneware etc.
Straight grinders are power tools designed for coarse and finish grinding of metals, as well as for brushing and milling them. They use many different tools: from cutter arbors to flap wheels.
Polishers are power tools used for matting and polishing surfaces varnished with polishes and fur coats.
These power tools consist of the following basic components: commutator electric motor for 1-phase alternating current (or brushless - still very rarely used), cooling fan, bevel gear, spindle with M14 thread, spindle lock, shield guard, switch , electronic control systems and systems increasing work safety (speed regulation and stabilization, kick-back stop, spindle brake, soft start, protection against restart, anti-overload protection), housing, additional handle and power cord and optional anti-vibration systems, autobalancer, etc.
The most important components of straight grinders are: commutator electric motor for 1-phase AC, cooling fan, bearings, working spindle which is an extension of the motor rotor, gear transmission (only for models with reduced speed), spindle with M14 thread or with a collet , blade guard (only for grinders with reduced speed), switch, electronic control systems (speed control and stabilization, overload protection, motor switch in case of the grinding wheel jam), casing (with main handle in the case of large machines), power cord.
These power tools are identical in design to angle grinders. In addition, they use additional bow handles or angular gear covers, which are designed to hold the power tool. These devices are not equipped with anti-vibration systems, autobalancers, as their electronics do not have a function that turns off the engine in the event of equipment jamming, because such events do not occur during operation. The most important function of the electronics is the speed control, which enables gentle polishing and optimal matching to the matting and polishing stage.
Angle grinders are used to drive a very wide range of accessories: corundum disc wheels for cutting and grinding, flap wheels, technical brushes, fiber and non-woven grinding discs, diamond cutting discs, cup diamond grinding wheels, hole saws with vacuum-brazed diamond coating as well as carbide cutting wheels, carbide cup wheels, etc.
Straight grinders are used to drive: HSS or sintered carbide milling arbors, ceramic mounted points and discs, synthetic grinding points, bands, abrasive caps and sleeves, non-woven grinding points, fan wheels, felt points, felt wheels, rings fabric, technical brushes etc.
The polishers use matting and polishing sponges, polishing pastes and fur (for final polishing).
The main technical parameters that characterize these power tools are: nominal power (small angle grinders - max. 1900 W, large angle grinders - max. 2600 W), idle speed (small angle grinders class 125 mm - 10,500 -12.500 min-1, small angle grinders, class 150 mm - 9300 min-1, large angle grinders, class 180 mm - 8500 min-1, large angle grinders, class 230 mm - 6600 min-1), spindle thread (M14), diameter mounted grinding wheels (100, 115, 125, 150, 180 and 230 mm), machine weight (1.5-7 kg).
Straight grinders are characterized by the following technical parameters: nominal power (max. 950 W), rotational speed in idle gear (max. 28,000 min-1), mounting holder (6 or 8 mm collets), outer diameter of grinding wheels (max. 50 mm), weight of the device (max. 2 kg).
The main technical parameters that characterize these power tools are: nominal power (max. 1450 W), idle speed (1800-4800 min-1), spindle thread (M14), diameter of sponges and fur coats (125 , 150 and 200 mm), the weight of the device (approx. 2.5 kg).
Angle grinders are mainly used in rough, medium and finishing grinding of metals and plastics, as well as for cutting them. Another very important field of their application is cutting and grinding of building materials: concrete, stone, ceramics, bricks, etc.
Straight grinders are power tools designed for metalworking: for grinding, deburring, cleaning, polishing, matting, milling, etc.
Corded polishers are used only for matting and polishing painted surfaces. The main industries that use these power tools are the automotive industry (renovation of car bodies, varnishing) and the furniture industry (polishing of furniture fronts).
Corded angle grinders are manufactured by AEG, Bosch, DeWALT, Fein, Festool, Flex, HiKOKI, Makita, Milwaukee, Metabo. The advantages of these power tools include high technical advancement, including numerous systems optimizing work and increasing its safety, as well as the ability to perform heavy machining tasks: grinding and cutting. Versatility is also an important advantage, so the possibility of processing a very wide range of materials.
These devices are manufactured by AEG, Bosch, DeWALT, Fein, HiKOKI, Makita, Milwaukee, Metabo. The advantages of these power tools include the ability to perform fine grinding tasks, including machining molds and small metal parts.
These devices are manufactured by AEG, Bosch, DeWALT, Fein, HiKOKI, Makita, Milwaukee, Metabo. The advantages of these power tools include the ability to quickly obtain high-quality varnished surfaces.
