Almost every home craftsman today, not to mention professionals, has a screwdriver in his arsenal. It is presented for sale in a wide range, may have different prices, as well as a certain set of functions. This equipment is used for turning and driving screws, self-tapping screws, as well as screws.
Not so long ago, such devices were quite expensive, so only companies and enterprises were able to purchase them. Today, manufacturers are developing models that are great for home use, they have a limited set of options, which has a beneficial effect on the cost. In the household, a screwdriver will not hurt, it can be used for minor repairs and even construction.
By visiting the store, you can choose for yourself a model that will have unique technical characteristics. It can be quite difficult for a simple consumer to make a choice. To facilitate the task, you need to consider several models at once in the price segment that you are counting on. Beforeit is necessary to decide what kind of power source the unit should have. Battery options are convenient in that they do not depend on the network, and when working with them, you can easily move around the construction site. As for network models, they do not have to be charged, this is their significant advantage.
There is another classification that provides for the division of tools into household and professional. Technical characteristics play an important role in this matter. Professional options are designed for long-term work. Their nodes will not overheat under prolonged loads, which allows you to achieve better performance results. These qualities are due to the strength of materials, as well as an effective cooling system. Among others, you can find an impulse screwdriver, which is quite popular among professionals and private craftsmen. This tool will be discussed below.
Features of choosing an impulse screwdriver
Quite often, home craftsmen think about which screwdriver model to choose. If you have before you - battery and network models, then you should consider the advantages of each of them. The latter option has high power, provides unlimited operating time and does not require recharging. There is also a drawback, it is expressed in relation to the power grid. If we consider a cordless impact screwdriver, it can be noted that among the advantages are the lack of connection to the mains and the high quality of the battery. The disadvantage is limited timework that is limited by battery power.
If you decide to prefer a cordless screwdriver, then it is important to choose the battery itself. If you have a nickel-metal hydride version in front of you, then it is distinguished by its performance at low temperatures. Such batteries also have a drawback, it is expressed in the memory effect. If you do not discharge the battery to the end, then its capacity will decrease over time. Nickel-cadmium batteries work great at temperatures below zero, but they also have a memory effect. Among the advantages, it is worth highlighting the resistance to power surges, because these batteries have good internal resistance.
What is an impact driver
Many screwdrivers have a pulse mode. It is expressed in the fact that torsion occurs intermittently, with tangential impacts or measured jerks. This makes it easier to drill holes on smooth and hard surfaces, because the drill will not go to the side. With the help of such equipment, it will be possible to easily unscrew or screw in a screw that has a damaged slot.
Pulse mode is found not only in screwdrivers, but also in wrenches, as well as screwdrivers, which are specially designed to create a tangential impact. An impulse screwdriver is able to work equally effectively with nuts and rusted bolts, as well as parts made of soft materials such as brass.
If we consider the scheme of such devices, then it almost does not differ from standard electric drills. Herethere is a motor and a gearbox, with the help of which the equipment transmits torque in the process of turning the screws onto the chuck. The same applies to the normal drilling mode. At the moment of increasing resistance to rotation, the equipment switches to the shock-pulse mode automatically, where the shock mechanism is used. A feature of the shock-pulse mode is that with the help of frequent and sharp impulses, it is possible to reduce braking. The torque increases while the rotational speed of the chuck decreases.
Impulse screwdriver allows you to solve a wide range of tasks, while achieving high speed and efficiency. But this tool also has some disadvantages. They are expressed in high noise, which is especially true for 18-volt screwdrivers, because their operation is accompanied by a rapid rotation of the chuck. Quite often, when choosing a screwdriver, home craftsmen wonder how a percussion tool differs from an impulse one. The latter was discussed above. And as for the impact mode, it is distinguished by rotation with an axial impact, which is similar to an impact drill. With this technique, you can drill holes in brick, concrete and other building materials more efficiently.
Impact screwdriver device
Now that you know how an impact screwdriver differs from an impact screwdriver, you can consider the device of the first. The equipment consists of the following units:
- speed controller;
- DC motor;
- planetaryreducer;
- battery;
- load limiting mechanism.
A spare battery and mains charger are optional devices. The engine is made in the form of cylinders, inside the body of which there are permanent magnets. The anchor is located on the support bushings, which are made of brass. The anchor itself is based on electrical steel with good magnetic permeability. Windings of insulated wire are placed in the grooves of the armature. After an equal number of turns, the winding enters the collector plate.
To ensure contact, the brushes are spring-loaded, they are isolated from the motor housing. Once you understand what an impulse screwdriver means, you can take a closer look at its device. It provides for the presence of a planetary gearbox. This unit is made in a separate case. The composition includes the following elements:
- sun gear;
- ring gear;
- carrier;
- satellites.
Gear parts can be based on metal or plastic. For a complete representation of the operation of the gearbox, the location of individual parts should be clarified. For example, a ring gear has the form of a cylinder with teeth inside. Satellites move along them.
For reference
When buying a screwdriver, if you already have a cordless drill in your arsenal, you may prefer the option with the same batteries. This will allow you to become the owner of a convenient anduniversal tool, and also get the opportunity to use the usual power for working with screws. Choosing an impulse screwdriver without a battery, you will pay a lower cost. But what model to purchase will be discussed below.
Description of Hitachi WM14DBL-TL impact screwdriver
The above model will cost the consumer 23,300 rubles. It is a cordless pulse tool that is used for working with fasteners, as well as drilling holes. The operator will be able to work in one of five modes, namely:
- bolt tightening;
- pulse;
- driving screws;
- electronic clutch control;
- drilling.
The penultimate mode allows you to stop the rotation of the motor when a certain torque is reached, the choice of the master is provided with five values. This Hitachi impact screwdriver has an efficient brushless motor that can last up to 50% longer than brushed counterparts. You can solve the issues of transportation and storage using the case that comes with the kit.
Reviews about the model
Considering the features of the above screwdriver, consumers quite often highlight a number of advantages, among them:
- Easy replacement of drills and bits;
- 5 modes to choose from;reverse;
- engine cooling;
- belt attachment.
As for the firstfeatures, it is provided by a hexagonal chuck, which provides for the possibility of changing the tooling with just one hand. This results in a lighter tool weight and less impressive length. This impact screwdriver, reviews of which should help you make the right choice, has five operating modes to choose from. They were discussed above. Between them, according to consumers, you can easily switch using the wheel next to the battery.
Among other things, there is a reverse button on the body, with which the operator can unscrew the fasteners and remove the stuck drill. There are ventilation holes on the case that provide effective cooling of the engine. The motor can run much longer without overheating.
Before choosing a good cordless screwdriver, you should pay attention to additional features, among which consumers especially highlight the possibility of attaching to a belt. The described model is supplied with fastening by means of which you will be able to hang up the tool in breaks between its use. As additional advantages, buyers consider LED illumination of the working area, clutch control mode, convenient storage and transportation, compact size and low weight, a lithium-ion battery that can be charged without waiting for complete discharge. Not to mention the efficient engine.
Model specifications
Before purchasing the described equipment, it is important to knownot only the device of an impulse screwdriver, but also its main technical characteristics. For example, the Hitachi WM14DBL-TL model has a battery capacity of 3 Ah. The type of chuck used is hexagonal. The maximum torque reaches 30 Nm. There is no impact function in this equipment, but there is a reverse option.
The maximum screw diameter is equivalent to 4.2mm. Case dimensions are 162x250x31 mm. The manufacturer supplies two batteries in the kit. The cartridge size is 6.35 mm. Among the additional functionality, the option of an engine brake should be highlighted, but there is no spindle lock in the design. The device weighs 1.5 kg. The spindle speed varies from 0 to 1100 rpm. The charge time is 0.75 hours.
Equipment can run at one speed. You may also be interested in the diameter of the cartridge, it is 6.35 mm. The maximum drilling diameter in metal and wood is 10 and 21 mm, respectively. This cordless impact screwdriver has a 14.4V battery.
Description of Makita XST01Z 18V LXT impulse screwdriver
On sale you can find an impulse screwdriver Makita model XST01Z 18V LXT. It is a brushless motor equipment with a one-year warranty. The oil-impulse technology is integrated into the design, which uses the viscosity of the hydraulic drive oil to work, this additionally reduces noise by 30%. The operator will be able to provide precise controlbehind the performed operations thanks to the three-speed mode. More productive work is guaranteed by the brushless motor, which extends its life.
Reviews about the model
The above Makita screwdriver does not use carbon brushes in its construction, and the battery energy is optimized thanks to the electronic motor control. With a single charge, this makes it possible to extend its lifespan. Users love that the tool offers the ability to switch between three speeds, with beats per minute ranging from 0 to 2700.
Model specifications
If you want to choose a good impulse screwdriver, then you should definitely pay attention to the model described above. It weighs only 1270 g, which does not put pressure on the hands. Drive size is 6.35 mm. The torque is equivalent to 40 Nm. The equipment is powered by electricity, which allows it to work for a long time.
Description of the Hitachi WM18DBL cordless screwdriver
This model will cost the consumer 27,600 rubles. It is designed for drilling holes and working with fasteners. During operation, the instrument does not emit much noise, which is kept at 68 dB. The unit is powered by a brushless motor.
The design allows you to quickly change the equipment, which is provided with just one hand. This model is not much different from Hitachi WM14DBL-TL, which was discussed above. However, this option has a battery voltage of 18 V. Otherwisespindle speed varies up to 1100 rpm. The kit comes with two batteries. The cartridge size is 6.35 mm. There is an option of an engine brake in the design. This 18 volt screwdriver hangs, the price was mentioned above and is acceptable for most consumers, weight - 1.5 kg. The frequency of strokes per minute reaches 1090. The diameter of the chuck is equivalent to 6.35 mm.
Description of the Metabo BS 18 LTX Impulse screwdriver
This Metabo impulse screwdriver costs 13,400 rubles. It is capable of operating in several modes. With the help of equipment, you can solve many complex problems, for example:
- drill steel tubes;
- unscrew and screw long screws;
- drill ceramic tiles.
In order to increase the service life, a special battery manufacturing technology was used in the production process. The device operates at 2 speeds, one of them provides for compliance with speeds up to 500 rpm, while the other - 2700 rpm. This 18 volt screwdriver, the price of which is acceptable and has already been named, weighs only 2 kg. Includes side handle, case with insert, belt clip, and quick-release chuck.
Conclusion
Quite often, lithium-ion batteries are installed in impact screwdrivers. They have the highest power and no memory effect. However, they have one important drawback, which is expressed in poor performance at low temperatures. For the conditions of Russia, thisfactor is very important, so many consumers refuse to purchase cordless screwdrivers.
