Almost every home master 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 to invert and wrap 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 acquire 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 cost. In the household, a screwdriver does not hurt, it can be used for minor repairs and even construction.
Having visited the store, you can choose for yourself a model that will have unique technical characteristics. It is 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. First you need to decide what kind of power source the unit should have. Battery options are convenient in that they are independent of the network, and when working with them you can easily move around the construction site. As for network models, they will not have to be charged, this is their significant advantage.
There is another classification that provides for the separation of tools into domestic and professional. An important role in this matter is played by technical specifications. Professional options are designed for long-term work. Their nodes will not overheat under prolonged loads, which allows to achieve better performance results. These qualities are determined by the strength of materials, as well as an effective cooling system. Among others, you can find a pulse screwdriver, which is quite popular among professionals and private craftsmen. This tool will be discussed below.
Features of the choice of a pulse screwdriver
Quite often, home craftsmen think about which model of a screwdriver to choose. If you have a battery and a network model in front of you, 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 a drawback too, it is expressed in relation to the power grid. If we consider a cordless pulse screwdriver, then it can be noted that among the advantages are the absence of binding to the mains and the high quality of the battery. The disadvantage is the limited operating time, which depends on the battery charge.
If you decide to prefer a cordless screwdriver, then it is important to choose the battery itself. If you have a nickel-metal hydride option in front of you, then it differs in working capacity at low temperatures. Such batteries have a drawback, it is expressed in the effect of memory. If you do not discharge the battery to the end, then its capacity will decrease over time. Nickel-cadmium batteries work fine at temperatures below zero, but also have a memory effect. Among the advantages, it should be noted resistance to voltage surges, because these batteries have good internal resistance.
What is a pulse screwdriver
Many screwdrivers have a pulsed mode of operation. 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.
The 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. A pulse screwdriver is able to work equally effectively with nuts and rusted bolts, as well as parts made of soft materials like brass.
If we consider the circuit of such devices, then it is almost no different from standard electric drills. Here there is an engine and gearbox, with which the equipment transmits torque in the process of turning the screws on the chuck. The same applies to conventional drilling. At the moment of increasing the 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 pulses it is possible to reduce braking. The torque increases while the rotation speed of the cartridge decreases.
A pulse screwdriver allows you to solve a wide range of tasks, while managing to achieve high speed and efficiency. But this tool has some disadvantages. They are expressed in high noise, which is especially true for 18-volt screwdrivers, because their functioning is accompanied by rapid rotation of the cartridge. Quite often, when choosing a screwdriver, home masters wonder about how a percussion instrument differs from a pulse one. The latter was discussed above. As for the impact mode, it differs in rotation with an axial impact, which is similar to an impact drill. Using this technique, it is possible to more efficiently drill holes in brick, concrete and other building materials.
Pulse screwdriver device
Now that you know the difference between a pulse screwdriver and a shock driver, you can consider the device of the first. The equipment consists of the following units:
- speed regulator ;
- DC motor;
- planetary reductor;
- battery;
- load limiting mechanism.
As additional devices, a spare battery and a network charger act . The engine is made in the form of cylinders, inside the housing of which there are permanent magnets. The anchor is located on the bushings, which are made of brass. The anchor itself is based on electrical steel with good magnetic permeability. Windings of insulated wire are laid in the slots of the anchor. After an equal number of turns, the winding goes to the collector plate.
To ensure contact, the brushes are spring-loaded, they are isolated from the motor housing. As soon as you understand what a pulse screwdriver means, you can familiarize yourself with its device. It provides for the presence of a planetary gear. This unit is manufactured in a separate housing. The composition includes the following elements:
- sun gear;
- ring gear;
- drove;
- satellites.
Reducer parts may be based on metal or plastic. To fully understand the operation of the gearbox, the location of the individual parts should be clarified. For example, the ring gear has the form of a cylinder, inside of which the teeth are located. Satellites are moving 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 and versatile tool, as well as get the opportunity to use the usual power for working with screws. Choosing a pulse screwdriver without a battery, you will pay a lower cost. But what kind of model to purchase will be discussed below.
Description of the Hitachi WM14DBL-TL Impact Screwdriver
The aforementioned model will cost the consumer 23,300 rubles. It is a cordless pulse tool that is used to work with fasteners, as well as drilling holes. The operator will be able to work in one of five modes, namely:
- screw tightening;
- impulse;
- screwdriving;
- electronic clutch control;
- drilling.
The penultimate mode allows you to stop the rotation of the motor when a certain torque is reached, five values are provided for the choice of the master. This Hitachi impulse screwdriver has an efficient brushless motor that can run 50% longer than brush analogues. You can solve the issues of transportation and storage using the case that comes with the kit.
Model reviews
Considering the features of the above-described screwdriver, consumers quite often distinguish a number of advantages, among them:
- simple replacement of drills and bits;
- 5 modes to choose from;
reverse; - engine cooling;
- belt mount.
As for the first feature, it is provided with a hexagon socket, which provides for the possibility of replacing equipment with just one hand. Due to this, a smaller tool weight and its less impressive length are achieved. This impulse 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 quite simply switch using the wheel next to the battery.
Among other things, on the case there is a reverse power button, with it the operator will be able to turn out the fasteners and remove the stuck drill. The housing has air vents that provide effective engine cooling. The motor can work much longer without overheating.
Before choosing a good cordless screwdriver, you should pay attention to additional characteristics, among them consumers especially highlight the possibility of fastening to the belt. The described model is equipped with a mount with which you can hang the tool in between its use. Consumers consider the additional advantages of 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 a complete discharge. One cannot but mention the efficient engine.
Model Specifications
Before purchasing the described equipment, it is important to know not only the device of a pulse screwdriver, but also its main technical characteristics. For example, the Hitachi WM14DBL-TL model has a battery capacity of 3 Ah. The type of cartridge used is hex. The maximum torque reaches 30 Nm. There is no shock function in this equipment, however there is a reverse option.
The maximum screw diameter is equivalent to 4.2 mm. Case dimensions are 162x250x31 mm. In the kit, the manufacturer supplies two batteries. The size of the cartridge is 6.35 mm. Among the additional functionality, the engine brake option should be highlighted, but there is no spindle lock in the design. The device weighs 1.5 kg. The spindle speed ranges from 0 to 1100 rpm. Charging time is 0.75 hours.
Equipment can operate 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 pulse screwdriver has a battery voltage of 14.4 V.
Description of a Makita XST01Z 18V LXT Impulse Screwdriver
On sale you can find a Makita impulse screwdriver model XST01Z 18V LXT. It is a brushless motor equipment covered by a one-year warranty. An oil-pulse technology is built into the design, which uses the viscosity of the oil for the hydraulic drive in operation, this additionally reduces noise by 30%. The operator will be able to provide precise control over the operations performed thanks to the three-speed mode. More productive work is guaranteed by a brushless motor, which extends its life.
Model reviews
The Makita screwdriver described above does not use carbon brushes in the design, and the battery energy is optimized thanks to the electronic control of the engine. Due to this, it is possible to extend the period of its use for one charge. Consumers love that the tool provides the ability to switch between three speeds, while beats per minute can vary from 0 to 2700.
Model Specifications
If you want to choose a good impulse screwdriver, you should definitely pay attention to the above model. It weighs only 1270 g, which does not give pressure on the hands. The size of the drive 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 produce very much noise, which is held at 68 dB. The unit works due to the brushless motor.
The design allows you to quickly replace the snap, which is provided with just one hand. This model is not much different from Hitachi WM14DBL-TL, which was discussed above. However, in this embodiment, the battery voltage is 18 V. Otherwise, the spindle speed varies up to 1100 rpm. Two batteries are supplied. The size of the cartridge is 6.35 mm. There is an engine brake option in the design. This screwdriver hangs 18 volts, the price was mentioned above and is acceptable for most consumers, weight - 1.5 kg. The frequency of beats per minute reaches 1090. The diameter of the cartridge is equivalent to 6.35 mm.
Description of the screwdriver Metabo BS 18 LTX Impuls
This pulse Metabo screwdriver costs 13,400 p. He is able to work in several modes. Using equipment, you can solve many complex problems, for example:
- drill steel tubes;
- to turn out and screw in long screws;
- drill ceramic tiles.
In order to increase the service life, in the production process, a special battery manufacturing technology was used. The device operates at 2 speeds, one of which provides for compliance with speeds of 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. The kit comes with a side handle, a suitcase with an insert, a holder for attaching to the belt, as well as a keyless chuck.
Conclusion
Quite often, lithium-ion batteries are installed in pulse screwdrivers. They have the highest power and lack of memory effect. However, they have one important drawback, which is expressed in poor performance at low temperatures. For the conditions of Russia, this factor is very important, so many consumers refuse to purchase cordless screwdrivers.