The choice of the screwdriver is not easy and quite responsible. There are many brands on the market today, and almost everyone has a wide range of products ranging from budget to professional devices. In order to decide how to choose a screwdriver for a particular case, you must first familiarize yourself with the main characteristics of this tool. All screwdrivers are conventionally divided into household and professional. As a rule, professional have more functions, but at the same time they are more dimensional and expensive.
The models of screwdrivers of different manufacturers differ from each other by the presence of additional functions.
When choosing a screwdriver, one of the main criteria is the presence of a battery. Thus, it is possible to divide all screwdrivers into mains and cordless. Both types have their advantages and disadvantages, as well as different areas of application. The main advantages of network screwdrivers are:
But at the same time, the only and significant drawback is the fact that the radius of use of such screwdrivers is limited by the length of the wire.
Based on this drawback, you can easily determine the main advantage of cordless screwdrivers. They can be used anywhere, just enough to charge the battery. But at the same time, such devices have several disadvantages that cannot be ignored:
Table of the main characteristics of screwdrivers.
Based on the advantages and disadvantages, you can easily determine the scope of application of each type of screwdriver. Network most often used during the work in rooms and with strong materials. Professional models can be applied even during construction work. Battery models are ideal for working on the street (for example, in the country) or for non-labor-intensive work. With their help, you can assemble furniture, twist and unscrew screws or drill soft materials (for example, wood).
If you stopped at a cordless screwdriver, then the functionality of the tool largely depends on the choice of the type of battery. There are 3 main types of batteries for screwdrivers:
The first 2 types have approximately the same characteristics. Their main disadvantage is the "memory effect", due to which the battery capacity can be significantly reduced in a short time.
The most common are Ni-Cd batteries. They appeared on the market among the first and still have some advantages over competitors. Their main advantages are:
But this type of battery has a number of noticeable flaws:
Thanks to frost resistance, this type of screwdriver is widespread in the northern regions. One of its undocumented, but often used possibilities is the drilling of holes for winter fishing. But nevertheless, when working with them, it should be taken into account that the battery must always be fully charged before operation, and discharged before recharging. If the screwdriver is not used for a long time, the nickel-cadmium battery should be completely discharged.
Circuit of a professional cordless screwdriver
Another common type of battery is Li-Ion. This is the most modern type of battery, they are almost not afraid of the memory effect, so the screwdriver with such a battery will always be ready to work. The main advantages of lithium-ion batteries are:
But these batteries have drawbacks that dumbly limit their use:
It is worth noting that despite the lack of a memory effect, lithium-ion batteries are afraid of "downtime." Therefore, screwdrivers with such a battery should be chosen only for intensive use. More power will allow you to use a screwdriver for complex tasks. Also, before using it is desirable to spend 3 full charge-discharge cycles This will allow the battery to be used as efficiently as possible.
Metal-hybrid batteries are much less common than the 2 types described above, but they have their advantages:
Among the shortcomings are the following:
If you want to choose the right screwdriver for domestic use, which will only be needed from time to time, then a device with a metal-hybrid battery will be an excellent choice.
In addition to the type of battery, you should pay attention to its capacity and power. In modern screwdrivers capacity ranges from 0.3 to 4 Amp-hours (Ah). Most screwdrivers on the market have a capacity of 1.5-3 Ah. The higher the capacity, the longer the battery life of the device. But at the same time, with its capacity, the weight of the device also grows, so the optimal volume for each will be different.
Battery power directly affects the performance of the screwdriver. Screwdrivers with capacities ranging from 3.6 to 40 V are on the market. For home conditions, 14-15 V are usually enough. More powerful screwdrivers require more capacious batteries, which significantly increases their weight and size. Devices with a capacity of more than 25 V, are usually professional.
An important characteristic of both network and cordless screwdrivers is torque. This characteristic is directly dependent on power. There are 2 types of torque: soft and hard. Soft torque determines the number of revolutions per minute when twisting / unscrewing the screws. Usually this indicator does not exceed 350 rpm. Hard torque is responsible for the number of revolutions during drilling. The maximum rate in this case is about 1000 rpm.
In the screwdriver specifications, torque is displayed in Newton meters (Nm). If you do not know how to choose the right screwdriver based on these figures, then you need to focus on its intended use. For example, for tightening a self-tapping screw with a length of about 10 cm you will need a screwdriver with a torque of about 40 Nm.
Screwdriver device: 1. Fastening unit. 2. Regulator effort. 3. Lever change direction. 4. Battery. 5. Charger.
An important characteristic of a screwdriver is the type of chuck. There are 2 types of cartridges - three-cam and hex. The first is distinguished by its versatility; you can insert any nozzles into it, which fit the diameter. Hexagonal supports special drill bit with a hexagonal tail. In the presence of a set of such drills, you can quickly change them, which is very convenient for intensive work with different types of screws.
When choosing a screwdriver, you need to pay attention to details that can significantly increase the efficiency of its use.
Summing up, we can conclude that there is no universal instruction how to choose a screwdriver. For each case, there is an optimal model. Of course, the higher the power of the screwdriver, the wider the range of its use, but at home, most often it is absolutely not necessary.
Before you go to the store, you should clearly determine what tasks the device will face.
After this, the choice will not seem so difficult.
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