Advantages and disadvantages
Screwdrivers under the DeWalt brand are manufactured in American factories, so they are head and shoulders above the mass products supplied from Asian countries.
Both in consumer reviews and in the assessments of professionals, the following features are invariably mentioned:
- stable quality;
- reliability in a variety of situations;
- excellent functional characteristics.
Some of the screwdrivers of this brand are capable of working in drill mode. Consumers can choose the right tool for construction and renovation work, furniture assembly and other tasks. It has a good balance of weight, size and operating power. Alignment is not a problem.
The newest DeWalt models are equipped with brushless motors. Compared to more traditional solutions, they are distinguished by both increased service life and lower energy consumption.
The battery can be charged in a short time, while all important parts of the screwdriver are hidden in a sturdy case and are reliably protected. The gearbox, which switches the rotation speed of the working part, is also quite reliable, since it is made of metal. The speed switching process does not take much time. And on any of them, the mechanism works for a rather long time, since the battery accumulates a lot of current. Users note that the tool is easy to use.
However, DeWalt screwdrivers also have the following weaknesses:
- it is not possible to buy a branded battery cheaply;
- occasionally there is a backlash along the axis;
- applying a lateral load can damage the cartridge;
- prolonged operation at high speeds can quickly deplete the battery;
- when performing individual manipulations, there is a little lack of power;
- not all modifications are equipped with charging indicators.
Brushless screwdriver
The cordless screwdrivers familiar to everyone are equipped with collector electric motors with switching the current in the armature windings using brushes. Brushless screwdrivers, in contrast, are equipped with brushless motors. The functions of the collector-brush assembly (KSHU) are performed by the electronic control unit. The difference is that it switches the current in the stator windings, not the rotor. The anchor does not have coils. To exclude sliding contacts from the design, its magnetic field is created by permanent magnets. The moment of current supply to the stator windings is determined using rotor position sensors (RPR), which operate on the basis of the Hall effect.
The DPR pulses together with the signal of the speed controller are processed by the microprocessor. The result of processing is the formation of electrical impulses modulated in width. This is the so-called PWM signal. The resulting pulse train is fed to current amplifiers (inverters). Their outputs are connected to the stator windings. Inverters, in accordance with the output signals of the microprocessor unit, switch the current in the stator coils. The alternating magnetic field caused by the pulses of this current, interacting with the constant magnetic field of the rotor, leads to the rotation of the armature.
Popular models and their characteristics
Whatever the technical nuances, DeWalt cordless and corded screwdrivers are equally convenient and useful in work. The American company has been producing them for almost 100 years. The vast experience accumulated during this time has made it possible to create brilliant designs. Their quality makes high prices fully justified. But that is why it is necessary to carefully choose the best options.
DeWalt DW263K is a relatively lightweight and high-power device with an output of 540 watts. These parameters allow you to confidently use screws and self-tapping screws of all existing sizes. By precisely adjusting the torque, adjusting the depth of the hardware insertion with the help of a nozzle, you can safely work even with drywall. This fragile material will not be damaged.
In principle, you can use the device as a replacement for a drill. But let us immediately note that such a function is not described in the instruction manual. You can use it only at your own peril and risk.
The highest rotation speed reaches 2500 rpm.
Another weakness of this model is the unusually high cost.
If you need an economical cordless electric screwdriver, it is useful to pay attention to the DeWalt DW907K2. The cost of the device is about 2 times lower than in the previous case
To save money, it is made as simple as possible, namely:
- with nickel-cadmium battery;
- no impacting mechanism;
- with a very simple body.
Nevertheless, the American manufacturer is true to itself. Its products fully cope with the task.
But you also need to remember about the lack of backlighting.
For drywall work, it is advisable to use a 12 volt screwdriver model DW979K2. The head of the device allows you to set the screwing depth. The nickel-cadmium battery is resistant even to extreme cold.
The DeWalt DCD710D2 has been receiving consistently positive feedback. Extra large lithium-ion batteries are included in the scope of delivery. They allow the device to operate for an unprecedented long time, even under high load. The developers have been able to optimize the case to work in confined spaces. Since all main parts are made of cast metal, the service life is significantly increased.
But along with these advantages, as well as the lightness of the equipment, one cannot fail to indicate its weak positions. So, if you turn off the motor abruptly, the tightening of the cartridge may weaken. The light beam from the built-in lamp is directed slightly to the side.
If you want to try the most new and advanced device, you need to opt for DeWalt DCD732D2. The unique brushless motor is guaranteed to be protected from dust particles and moisture contact. The innovative engine, in principle, does not require repair and maintenance. Thanks to its high revs, the machine can drill both metal and ceramics.
The powerful chuck holds 13 mm drills. Torque up to 57 Nm is supported with optimum current consumption. The screwdriver case is convenient, but the device itself does not know how to work in shock mode.
Among the battery systems that can work in shock mode, the XR Li-Ion stands out. The device is designed for 18 volts and is compact. Consumers praised the screwdriver's lightness and ergonomics.
The developers have equipped the unit with electronics, giving the consumer full control over the work. Changing nozzles takes place without unnecessary problems, even if you operate with only one hand. The quality LED system allows it to work very well even in the dark. The gearbox is made of 100% metal. This simultaneously improves energy transfer and extends the life of the device.
The tape type of screwdrivers deserves special attention. They are used in cases where a large number of such fasteners need to be tightened. The performance of the belt system is consistently higher than that of the traditional sample. Various manufacturers have long chosen the same type of workflow automation.
Everywhere a machine-gun-like belt is used (hence the name).
Which screwdriver to choose
Let's compare the main characteristics of brushless and collector cordless drills:
- The efficiency of brushless is almost 1.5 times higher (90 versus 60%). This means that with the same battery capacity, the brushless will work much longer without recharging.
- Brushless motors have a longer MTBF than brushed motors.
- The mass and dimensions of the former are less than the latter.
Having analyzed the advantages and disadvantages of cordless screwdrivers, we can confidently say that models with a brushless motor are better. If the cost of the compared screwdrivers were close, the best one should have been chosen.
But the advantages of brushless are quite expensive. The question is whether you need them for this price difference.
There are people who work exclusively with a cheap Chinese instrument. They explain this by the fact that the eternal instrument has not yet been invented. And anyone, even the most expensive one, will someday fail, then you will need to spend time and money on repairing it.
An inexpensive tool usually manages to work off the money spent on its purchase before it breaks down. Therefore, it is not a pity to throw it away, buy the same inexpensively and work again with a new one. As they say, how many people - so many opinions. The choice is yours!
User manual
To ensure that the generated vibration does not exceed the values specified by the manufacturer, you need to use the tool only in a regular way and keep it in order. It is forbidden to connect the screwdriver to the network if it is not secured by fuses of at least 230 V and 10 amperes. It is unacceptable to carry the device by the cable, hold on to it when disconnecting from the network. Also, contact of the cable with water, lubricating oils, sharp objects is prohibited. Do not twist the wire.
Outdoors, you can use only cordless or connected via a screwdriver adapted for the street. In all humid places, it is forbidden to connect without an RCD.
You also need to remember about such points as:
- inadmissibility of using a screwdriver in an explosive, fire hazardous environment;
- inadmissibility of work without glasses and gloves;
- obligatory headphones or earplugs for prolonged work;
- the need to avoid when working contacts with grounded conductive surfaces.
Conclusion
The assortment range of Devolt screwdrivers offers the user from amateur to professional a worthy tool, the price of which is justified by high quality workmanship and reliable operation for a long time.
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