DeWALT DCG412M2
This model differs from competitors primarily in appearance: its rear handle has a special shape and is equipped with a protective bracket. Hand protection is a great help when performing complex technical tasks, but it increases the size of the tool, making it less ergonomic. Accordingly, before buying an angle grinder, you should determine exactly what kind of work will be performed with its help, since in some cases large dimensions can become a serious obstacle to using the unit. The possibilities of the DeWALT battery grinder are quite extensive, and the device itself has a well-thought-out device. Thus, the operator does not have to use additional tools to reposition the cover in the machine.
Grinder DeWALT DCG412M2
The spindle of the angle grinder has a rubber ring that protects against vibrations, as well as softens the movement of the wheel, which simplifies machine control. At the same time, the model is equipped with a standard flange nut screwed with a wrench, which creates certain difficulties in the process of operation. The front handle is long enough, which provides a more reliable grip and allows you to hold the angle grinder by the body if work is carried out in pits or niches without losing a safety factor (the only drawback is that one hand must necessarily press the start button, since the device does not have a fixation when it is turned on. position). As a kind of compensation, a system for blocking accidental clicks is provided in the form of an additional through button. This safety measure is very important, since the battery is always in an active state, and the spindle does not have a brake (the circle continues to rotate for some time after the power is turned off, and therefore, when using this angle grinder, you should especially carefully follow the safety rules).
Informing about the charge level is carried out using a line of three LEDs, while the indicator is located directly on the batteries. The model loses in terms of performance, but has excellent indicators of resource extension. Thus, the power supply to the motor is quickly cut off when overloaded, which is especially noticeable when grinding: the wheel stops immediately when the pressure is stronger than necessary. At the same time, do not forget that grinding is only an auxiliary task of angle grinder, the main purpose of this unit is cutting. Cost from 25,000 rubles.
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Key parameters when choosing a good battery grinder
When choosing angle grinders from the most popular models, you should pay attention to several key parameters:
- Ultimate stress;
- Battery capacity;
- Possible scope of work, for which one battery charge is enough;
- The number of cuts on one battery charge;
- Efficiency of grinding work when using two types of bakelite grinding wheels (6 mm and 3 mm thick);
- Resistance to low temperatures (it is known that at low temperatures the performance of batteries is significantly reduced, therefore, products that do not lose their working qualities in the cold are considered to be of higher quality);
- Grinding quality.
An additional parameter of evaluation can be the indicator of fluctuations in the spindle speed. As a rule, for battery devices, it is lower than for units powered by the network. Fluctuations in the spindle speed affect wheel consumption and productivity: the lower the speed, the faster the wheel wear.
It is also important to monitor how the temperature of important units of the unit changes after intensive work. Heat is known to increase at higher operating intensities, causing shorter cell life and reduced battery performance
Developers pay a lot of attention to this parameter, trying to find the optimal balance in fairly stringent boundary conditions.
Freezing batteries and their capacity
Practice shows that when cooled, the ability of batteries to provide high current decreases. So, with increased pressure on the unit during grinding, the number of revolutions decreases faster if the device has a battery cooled before use. Also, cooling the batteries before use can cause a reduction in the total weight of the removed metal, but this difference is not critical, and after recharging this negative effect can be completely eliminated.
Important: do not freeze the batteries, this will adversely affect the service life. Most modern angle grinders have lithium-ion batteries, however, all of the above proves that hypothermia is not fatal for
Manufacturers do not recommend storing batteries for a long time in a discharged state and at too low temperatures, since this increases the risk of deep discharge, but such cases are extremely rare. To ensure long battery life, you should fully charge them before storing.
Most modern angle grinders have lithium-ion batteries, however, all of the above proves that hypothermia is not fatal for anyone. Manufacturers do not recommend storing batteries for a long time in a discharged state and at too low temperatures, since this increases the risk of deep discharge, but such cases are extremely rare. To ensure long battery life, you should fully charge them before storing them.
Selection Tips
First of all, you should decide on the required engine power. The mini-grinder is small and lightweight, it is very convenient for it to perform precise work. Such a machine will be the best for housework, when laying ceramic tiles or in a carpentry workshop. A low-power engine will not allow the use of large-diameter disks, but this angle grinder is the most inexpensive.
A weak motor is unsuitable for cutting thick metal sheets or sturdy metal pipes. Small batteries of an ultra-compact machine do not allow you to work for a long time.
Powerful angle grinders are heavier than similar ones powered from an outlet. Such a machine quickly “eats up” even the most capacious batteries. Make sure you have spare batteries included.
The engine power must be selected depending on the tasks ahead. Power from 200 to 600 watts is sufficient for most jobs. Remember that the main advantages of the cordless sander are lightness and compactness. A large angle grinder is needed if you plan to work a lot with thick metal profiles or viscous materials such as drywall.
Comparing devices of similar power, you can see that different brands have different battery voltages. The nominal capacity of the battery can also vary. The best battery will be the one with the larger total capacity. To determine this parameter, the battery capacity (in ampere-hours) must be multiplied by the battery voltage (in volts).
If possible, it is advisable to choose a grinder with a protective cover, the mechanism of which makes it easy to change the angle of its attachment. It is good if the kit includes covers of different sizes and shapes to perform different types of work.
The safety of working with angle grinders is influenced not only by the strength of the protective casing. The material from which the body of the machine is made must also be durable. The shape of the body should be comfortable to grip, and the material should not slip in your hands (especially with gloves).The shape and location of the control buttons are also very important.
Cordless versions
Noteworthy is the AEG Bews 18-125X-0 cordless grinder. She is able to cut a variety of objects and products, as well as successfully grind them. Almost complete independence from power supply significantly increases the mobility of the device. But if this feature is inherent in all battery models, then the ergonomics and lightness of the grinder are the result of the painstaking work of German engineers. They also provided effective protection against various overloads, creating a machine with the longest possible service life.
The outer diameter of the disc is 115 mm. At the same time, it can cut through the material to a depth of 2.8 cm. The designers took care of the charge indication and the anti-vibration properties of the side handle. Replacing discs when needed is very easy. Removal and return of the casing to its place is done without a key.
An alternative solution could be AEG Bews 18-125X LI-402C. Engineers have specially designed this model so that it can be used successfully in a wide variety of conditions. The manufacturer claims that cutting and grinding is done at a very high level with the machine. The lightness and compactness of the mechanism simplify its use, as well as the absence of special differences in design from other similar products.
Does angle grinder have disadvantages
Like any other technique, there are some disadvantages to cordless angle grinders. However, when choosing, positive qualities can be found even in the cheapest models. Each buyer should evaluate the instruments based on their tasks and requirements for the instrument (and therefore financial capabilities). So, you should decide which unit is needed - professional or household, how often you plan to use it, and also take into account your own skills in using such machines.
Let's review the battery grinders and consider the advantages and disadvantages of the most common angle grinders in our country.
Output
Cordless angle grinders are a handy tool in the absence of an electrical network or inability to connect to it. Within the specified period, they can successfully cope with the work no worse than their network counterparts. Modern development technologies have made removable batteries a serious competitor to plug-in appliances.
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