Models and their technical characteristics
Perhaps one of the most popular models is DeWalt DWE 4015
She attracts attention because she has all the necessary characteristics for fruitful work and is suitable for both a professional and a beginner. The tool is designed for cutting different types of metal and grinding all kinds of surfaces
The disc diameter of this model is 125 millimeters, which is ideal for household purposes. The number of revolutions per minute reaches 10,000, which indicates a fairly high performance. The power of this device reaches 730 watts. Also in the model we are considering there is a switch and a spindle lock, a strong protective cover - these parts are important for safety reasons. The body of this model is quite narrow, which makes it easy to hold it in the hand, and the additional attachment - the handle, which is included in the kit, greatly simplifies the task of the builder. The price of a tool for a professional can reach 4,000 rubles.
A more expensive option is the DeWalt DWE 4215 angle grinder, the price of this model on the official website is a little more than 6,000 rubles, but the functions it has are the same: cutting all kinds of parts and grinding various surfaces. The engine power reaches 1200 W, which, of course, cannot but rejoice, the diameter of the discs used is 125 millimeters, and the number of revolutions reaches 11,000.
Automatic shut-off of brushes and blocking of the spindle greatly facilitate the work of the builder and make it more fruitful. The metal casing serves as an excellent safety measure for the master, and the dust extraction system makes the construction process more comfortable. The disadvantages include the fact that there is no electronic adjustment of the number of revolutions, there is no safety clutch.
A real breakthrough in the production of grinders is the DeWalt DCG414N cordless angle grinder. It is this unit that allows you to solve a huge number of tasks for cutting materials and grinding surfaces without the presence of a nearby power source, but only thanks to the operation of a Li-ion battery. For a minute, this model is gaining about 9,000 rpm. The disc diameter is 150 millimeters.
An important advantage of the model we are considering is lightness, its weight reaches 2.2 kilograms, which allows you to work with it at a height, and the non-slip and anatomically comfortable handle and even an additional side attachment help with this. The spindle lock and the effective protective cover for the operator have a positive effect on the construction process
Important note: the brushless grinder from the official website is supplied to the customer without battery and charger... The price of this model is 14,000 rubles.
Advantages and disadvantages
This cannot be called their disadvantage, since both parameters are related to the capacity of the battery pack “on board” of the angle grinder, which should have a reasonable weight and size in case of autonomous manual operation. The main problem that limits their mass use is the cost, and not of the power tool itself, but of its power supplies. The price of one battery pack can range from 50 to 100% of the price of the grinder itself. At the same time, depending on the modes, it provides operation for 10-30 minutes, after which it is on charge for several hours. Thus, for operations comparable to the operation of a network analogue, it is necessary to have several battery packs.The price of such a kit for a grinder with a power of about 500 W will be at least 20 thousand rubles.
Advantages and disadvantages
Of course, when choosing a grinder, both a professional and an amateur pay attention to the main characteristics, thanks to which it is possible to determine the performance of a particular model. The DeWalt company offers its customers the highest rates in many parameters (unlike other manufacturers)
First of all, each of the models can boast of high performance, which is important for long construction work. DeWalt grinders are able to work without interruption for a rather long time period, without heating up and without losing their technical characteristics
Manufacturers have taken into account the fact that their products are used by a great many people of various professions, so the diameter of the working part capacity varies from 115 to 230 millimeters.
Also, many models are distinguished by the ability to adjust the casing without using a special key. This is the most convenient option, because during construction work it is not always possible to do too many movements at the same time. In addition, many users note the correct location of the buttons in easy accessibility. Consequently, a huge plus of the grinders of this brand is that they are practical to use. Moreover, some models are equipped with a function of protection against deliberate start, electronic speed control, self-switching brushes and many other functions that greatly facilitate the work.
Peculiarities
The company has been working and creating really high-quality products for almost a century. During this time, she has introduced a lot of new things into the world production of construction tools and has confidently taken her place among many well-known leaders in this field. The DeWalt brand has created its own style, which has not changed for a long time, in the high quality of which there is no doubt. Production sites of the brand are located in the USA, Canada, Mexico, Great Britain, Germany. In Russia, several large companies supply tools to specialized stores, where they are tested and are in constant demand from buyers, which, of course, speaks of the quality of the products.
Manufacturers have been working on each model of an angle grinder for a fairly long period of time. They think over all the details that will help the worker, make his work easier and, as a result, will give a really good result.
Selection Tips
When choosing any product, it is necessary to take into account the main characteristics by which its quality and performance are determined. For a grinder, this is, first of all, power, the size of the discs, on which the construction process depends, the speed of rotation and some other additional functions (for example, the presence of a brush), thanks to which the tool improves its performance.
Of course, for a start it is important to decide which tool you need: household or professional. The first option is not suitable for everyday use, as the worker must take regular breaks to avoid overheating the tool.
Moreover, if it is supposed to work in difficult conditions, for example, near the ground or where there will be a lot of dust, you need to stop your choice on a professional tool. The body of such devices is made of metal, and the tool itself is equipped with brass inserts, which makes it more wear-resistant.
An apparatus is suitable for self-repair at home, whose disc diameter is equal to 115 millimeters, but for daily use it is worth considering those that reach 150 or more. If work is supposed to be of medium complexity, then it is worth considering models whose power reaches 900 watts.For those whose work is related to the frequent use of a grinder, a 1500 W machine is suitable.
Subtleties of operation
With each of the DeWalt models, as with any other grinders, it is important to observe the simplest, but playing a huge role, safety rules. For example, it is necessary to work only in closed clothing and in a special mask in order to avoid damage to the skin.
It is important to check the serviceability of the tool and the electrical wire before starting the construction process. Try to work indoors where there are no exposed wet areas.
There are usually no difficulties with DeWalt angle grinders, but the simplest measures are still necessary. Since most often it is the grinder discs that need to be changed, we will consider how to do this. First of all, you need to de-energize the tool for safety reasons. Then you need to press the spindle lock and unscrew the lock nut with a special wrench. If suddenly working with a key seems like a long enough occupation, you can purchase a modernized nut with a spring-loaded base. In this case, give preference to trusted foreign brands Bosch or Makita.
Let's also take an example of how to disassemble a reducer. Obviously, first you need to remove the gear cover, disconnect the stator housing and free the rotor. Then the rotor must be clamped, which will help unscrew the nut that serves as a fastener for the drive small gear. Then remove the damaged bearing, replacing it with a new one.
Advantages and disadvantages
The main advantage of cordless angle grinders is portability. The battery grinder is small and light. Compared to units that are powered from an electrical outlet, rechargeable angle grinders produce much less noise during operation.
Replacement grinder batteries are often suitable for other types of cordless tools of the same brand. This allows the master to alternately work with a grinder, and a cordless chain saw, and a screwdriver.
Even their low power can be considered a plus of the cordless tool. The models of electric motors used in them operate at very high speeds. This allows you to work with small diameter discs no less efficiently than large ones. The higher rotational speed also contributes to a neat, scratch-free, burr-free material handling.
The cordless tool also has disadvantages. When cutting thick, tough material is required, a low-power cordless tool may not be up to the task. Batteries "run out" pretty quickly. When processing durable materials, a single battery can last only half an hour. The battery will then need to be recharged, which can take several hours - you have to keep spare batteries close at hand.
All other things being equal, a rechargeable grinder is several times more expensive than an angle grinder of the same parameters powered from a household outlet.
Repairing cordless tools is also more expensive and more difficult. For grinders powered by 220 volts, many spare parts are compatible and interchangeable between different models. Spare parts for cordless angle grinders can not always be found on sale.
Models and their characteristics
Now the range of cordless grinders is not too extensive. The produced models differ greatly in such characteristics as: engine power, battery capacity, type of electric motor used.
The angle grinder on the battery, first of all, should be compact and convenient. The most common grinders are equipped with collector motors with two or four carbon brushes. They are available in any capacity and are relatively inexpensive.
The brushless sander is distinguished by the fact that its motor does not have a brush manifold assembly. This makes the motor maintenance-free.But cordless tools with such motors are much more expensive than machines with brushed motors.
If possible, a tool with speed control should be preferred. A portable sander with this adjustment allows the best use of discs of different diameters and different strengths.
Working with some materials requires a decrease in the speed of rotation of the working tool. For example, a metal cutting saw does not tolerate high cutting speeds. At the same time, a diamond blade for cutting extremely hard materials requires a high spindle speed.
Cordless angle grinder device
Structurally, the battery angle grinder differs from the network only in the power source and the type of electric motor. The main components of any of them are (see figure below):
- robust body, which also acts as the main handle;
- an angular gearbox with a safety clutch that transfers rotation from the motor to the spindle;
- protective cover;
- electric motor;
- rotation speed control system;
- power supply contacts.
Typical voltage values of battery power supplies for Bulgarians are 10.8, 12, 18, 24, 36 and 54 V. Such units are an assembly of individual finger batteries with a voltage from 1.2 V (nickel-cadmium and nickel-metal hydride) to 3.6 V (lithium- ionic). Their repair is quite well mastered both in service workshops and by folk craftsmen. The world's leading manufacturers of power tools have recently been using brushless electric motors as drives for cordless grinders, which have higher efficiency, smaller dimensions, longer service life and low noise levels. Such motors operate under electronic control, so they easily implement various control modes: speed control, soft start, maintaining speed under load, instant stop, and others.