Which voltage is better for an electric screwdriver. The estimated service life
Which electric screwdriver is better to choose: 12, 14 or 18 volts?
Squads have indicators that few people pay attention to. Meanwhile, for professionals, they are almost the first place. This article will tell you what an electric screwdriver, 12, 14 or 18 volts, better and why.
To make a choice in the direction of reliable and high.Quality electrical screwdriver, you need to know some important characteristics of the tool.
Types of engines
Engines used in screwdrivers are divided into 2 types. Brush and brilliant. In the brush (collector) version there are brushes for removing electric current. The advantage of such a motor is a low price. The minus will have a low percentage of the useful coefficient.
Brightless (inverter) engines have collected more positive points:
- Long life.
- Tolerance of irregular overload.
- Wide range of speed of rotation.
- Efficiency above the brush engine by 30%.
- The speed is not reduced when the load on the cartridge.
- There is no sparking, therefore it can be used in rooms of increased fire hazard.
A significant drawback of such engines is a high price tag, so they are more used in a professional environment.
The indicator of the torque
The minimum torque in the screwdrivers is 6 nm. Household modifications have an indicator from 8 to 23 nm. Semi.Professional tools go with a moment from 80 to 110 nm. In professional units, the amount of torque starts from 110 nm and reaches 200 nm.
Some shock screwdrivers with a torque of 120-140 nm can be used as an ice-block on winter fishing.
Squads with a 10.8 B battery allow you to assemble furniture and drywall structures and are designed for use at home.
Dewalt DCD710D2 24 Nm
- Type of cartridge. Fast asleep;
- Maximum torque, (n m). 24;
- Battery capacity (Ach). 2;
- Type of battery. Li-Ion;
- The number of batteries included. 2.
Corps and ergonomics. This electric screwdriver has a balanced design and weight of only 1.1 kg, which is important with prolonged professional work. Its case is made of shockproof plastic. The handle thanks to the rubberized surface and convenient form confidently falls into the brush. The lower part provides a nest for attaching a strap that frees hands when moving at a height. With insufficient illumination, you can turn on the built.In flashlight.
Engine, gearbox, battery. The output power of the brush engine of 180 watts is enough to drill holes with a diameter of up to 20 mm in wood and up to 10 mm in metal. The gearbox has two gearboxes with a smooth acceleration of up to 400 and 1,500 revolutions per minute. A fast.Packed type cartridge allows you to work with shanks with a diameter of 1.5 to 10 mm, spending a minimum of time replacement.
The model is sold complete with a charger and two lithium-ion-i ion-type slider-type batteries with a capacity of 2 ah each. Alternating their replacement during the shift reduces the duration of downtime.
Functional. With a smooth turn of the regulator with 16 standard provisions, you can set a torque up to 24 nm. The reverse key allows one motion to change the direction of rotation of the spindle. The engine brake prevents excessive pressing of the hats of self.Tapping screws when working with mild reasons.
DEWALT DCD710D2 24 Nm control buttons.
- Reliable engine.
- High performance.
- Quality assembly.
- Comfortable shape and small weight.
- Two batteries included.
- Sold with a durable case.
Makita DF333DWAE 30 Nm
- Type of cartridge. Fast asleep;
- Maximum torque, (n m). Thirty;
- Battery capacity (Ach). 2;
- Type of battery. Li-Ion;
- The number of batteries included. 2.
Corps and ergonomics. All elements of the outer shell of this electric screwdriver are made of durable plastic, which allowed the developers to meet 1.1 kg weight. Rubber overlays on the handle and protruding parts of the case not only contribute to the reliability of the grip, but also soften the blows in case of falling. There is a spring clip to wear a belt belt. Built.In LED lamp well illuminates the working area in the dark.
Engine, gearbox, battery. The electric screwdriver is equipped with a reliable electric motor with a good air cooling system. Power is enough for working with screws with a diameter of up to 5 mm. The model has two rotation speeds with a maximum frequency of 450 and 1700 rpm for operations with fasteners and drills. A rapidly packed cartridge holds equipment with cylindrical shanks with a diameter of 0.8-10 mm.
A pair of universal lithium-ion batteries per 1.5 Ah with an indicator of the charge indicator, which can be used with other tools of the same brand. For the charge of each of them in a regular device it takes less than an hour.
Functional. The maximum torque is 30 nm. It can be lowered by rotation of the drum. There is an option of reverse and electronic adjustment of the speed of rotation.
- High performance.
- Large torque.
- Convenient form.
- Universal batteries.
- Voluminous case made of durable plastic with compartments for tools and consumables.
- Acceptable cost.
Top 9 Best Electric Screwdrivers Review 2019
How not to make a mistake when choosing an electric screwdriver
Keep in mind that, having come to the store, you should not pay attention only to the cost of the device. Check out the passport you like the model. It will necessarily indicate the most important technical characteristics of the device. These are: rotation speed, type of battery (unless, of course, it is available) and torque. According to these parameters, you need to choose a tool for yourself.
For “pros” or household electric screwdriver
Think about what repair and construction work you plan to carry out. Based on this, and make your choice. If you make it not so enthusiastically, and it will be enough for you to get the device from the case only a couple of times a month, it makes no sense to take a professional electric screwdriver. Right, there is no sheepskin. An amateur model working from the battery, you are enough for you. She has all the necessary functions, but she weighs much less than professional.
If almost every day you need to collect, screw or build something, then look aside not very cheap, but very powerful professional models. They usually work from the network, have impressive dimensions and weight.
About the torque and speed of rotation
The torque determines what power the electric screwdriver attaches to the wrapped screw, or with what force it resists the load. In everyday life, devices are used, the torque of which is from 10 to 15 Newton meters.
Professional models can have a torque of up to 130 Newton meters, as a result of which they have the opportunity to drill very solid materials. The engine shaft in such devices makes 1200-1300 revolutions in one minute. Household models are satisfied with 400-500 revolutions per minute.
Depending on the torque, the length of the screwed screw is selected, as well as its diameter. Powerful screwdrivers can be tightened thicker and long screws. Also, these devices can be used when working with fairly solid materials, without fear of breakdowns.
Electric screwdrivers differs from other power tools in that its torque can be adjusted. For this, a simple device is used. A limiter. It is a ring located immediately after a clamping cartridge. With the help of it, you can install a certain effort after which the screw will no longer be screwed. Screwed the screw. The cartridge immediately stopped, although the engine is still spinning.
In this case, the sound of a rattle is clearly heard. Such a limiter protects the instrument from many troubles: bits wear, breakdowed a slot at the screw, as well as its too deep dumping into the surface.
The limiter of the maximum torque.
The rattle of the engine coupling protects it from overloads, allowing the spinning shaft to slip freely. The maximum torque established, by the way, is quite sufficient to turn the screw and the most tight, and do not overload the engine. To go into drilling mode, you need to transfer the coupling to the opposite extreme position. In this case, the restriction of the torque will be removed. E. Electric screwdriver will work as a regular drill.
Usually screwdrivers have two operating modes. One allows you to drill, the other to twist the screws.
To choose the right electric screwdriver, keep in mind and some other nuances. It is necessary to check whether the electric motor is working stably when loading whether the frequency of its rotation is preserved. The quality of the power supply, its ability to keep the charge, as well as the power of the device with a sowing battery, is also important.
Batteries or working from the network?
There are two types of screwdrivers: working from the network cord and having their own battery. As for the former, they have a solid weight, and you can only work with them not far from electric sockets. However, you can buy an extension cord, on its meter and the range of tools will depend. Batteries are easier, and also have a significant advantage. Autonomy.
It is far from always necessary to build near sockets, so in the field of models with your own battery, of course, is more convenient. Agree, a little pleasure is to wear wire meters, which, as luck would have it, is also constantly confused. And when working at altitude, it is not at all possible to use network models. After all, they are also heavy. Upwards are problematic. Therefore, we will consider in more detail the model with the battery. It is important to choose the right type here.
The most widely used battery electric screwdriver.
Choose a battery wisely
To work with comfort, and not to run to recharge the tool every half hour, carefully react to its battery. An excellent service will be a spare battery if it is included. As for the recharge time, it is for a professional tool for about an hour, and in amateur. Up to 7 hours. It depends on the charging device.
In screwdrivers, batteries of three varieties are used:
Ni-mh batteries are small and light, they do not like frosts and overloads on current. The number of recharge with a stable capacity of them is 1500 times. For storage, such batteries must be well charged, and stored in a discharged form is not permissible. But they do not have such a greater memory effect as nickel-cadmium and are more powerful.
Batches based on nickel-cadmium elements are more toxic, but the number of reloading is twice as much as the previous type. They are also cheap enough, but they are not afraid of frost at all. So for Russian conditions, there are now better suited. But these batteries suffer from a strong self.Discharge, and also the effect of memory. These are significant disadvantages. For storage, do not forget to completely discharge them. Otherwise, you risk getting a battery with a smaller capacity as a result.
Lithium-ion batteries are sensitive to cold, which is nickel-metal-hydrite batteries, and their power is low. Number of recharge. Up to 3000, there is no memory effect. They are practically not susceptible to self.Discharge. They are somewhat more convenient when used at home.
Types of screwdrivers
Classifications of screwdrivers are enough. Manufacturers produce household and professional tools, which, in turn, may differ in power elements, in particular, in their power, in diameter of the cartridge, according to materials from which gear of the gearbox are made. There are screwdrivers that have additional functions. It is clear that the price of various types of screwdrivers is also different. The price also depends on the brand. Consider how screwdrivers are different for nutrition elements. Devices are divided into two large groups: battery screwdrivers and electric.
Li-Ion batteries are extremely common and popular today. They are used in many tools, portable devices, etc. What explains this demand for these batteries? Their advantages include:
- Three thousand battering cycles.
- The batteries have a very small weight, they are very light.
- The battery is charged very quickly.
- The battery does not have the effect of memory to charge.
INGCO Lithium ion cordless screwdriver CSDLI0801
But the modern Li-Ion battery has and negative qualities. For example, such a battery has been working for only three years, which means that it must be used for this period to the maximum, otherwise it will be a pity the money spent will be spent. Li-and-re is quite expensive. Li-Ion batteries are afraid of frost, so if frost resistance is important, it is better to choose ni-mh batteries. Conclusion:
- These batteries must be bought if there is a constant rather than one.Time work with an electric screwdriver.
- Li-ion batteries are not recommended for complete charging and discharge so that the battery lasts as long as possible (category-at least 15%, charge-no more than 90%).
- To calibrate the battery, the execution of three cycles is enough (cycles are performed in a row).
Battering batteries NI-CD
These batteries have been used for a long time both in screwdrivers and in other tools. The number of cycles of the charge-discharge is one and a half thousand. Such batteries last longer LI-Ion. Five years. The use of NI-CD batteries allows you to use the tool at low temperatures (in frosts no more than 15 degrees). The popularity of these devices is also facilitated by the fact that their cost is the lowest for batteries. NI-CD batteries include:
- Battery charging lasts quite a long time, at least an hour, or even more.
- The battery has a memory effect to the charge.
- Ni-CD battery has a significant weight.
- Since Ni-CD batteries are characterized by the effect of memory for the charge, the batteries need their full charge and discharge, which will allow them to serve for a long time.
- Full charging is performed using a conventional charger.
- The full category can be performed using a flashlight, which is often attached to many sets to a screwdriver.
Voltage and container capacity
The batteries differ from each other with such important parameters as capacity and voltage. The unit of measurement of the container is an amperes multiplied by an hour (Ach). The battery charge directly depends on its capacity. Accordingly, with an increase in capacity, the duration of work increases, which can be performed without a new charge of battery. The battery voltage, the unit of measurement of which is the volt (c), determines the power of the electrical screwdriver or any other battery type tool. In the language of professionals, this means that it depends on the voltage which indicators will have both soft and hard twisting moments of an electric screwdriver.
Network (electric) screwdrivers
These screwdrivers are included in the electric network and similar to electric drifts. The main difference between such an electric screwdriver from the drill is that it can be adjusted to the torque. The screwdrivers that work from the network are great for work at home, which are performed from time to time, and for professional builders. Electric screwdriver does not need charging, it works as much as necessary, from the network, and this is its undoubted advantage. But there is also the reverse side of the network tools created by the presence of an electric network: firstly, for work, you need the summarized electricity, and secondly, the tool wire often interferes, limiting mobility and confusing under the feet.
About the cartridge and gearbox in an electric screwdriver
In an electric screwdriver, there may be either a fast-packed three-cubed cartridge (with a snap in the snap-in-law of 1/2-13 millimeters), or a cartridge that has a hexagonal nest with a shank of 1/4 inches. The larger size of the fast.Packed cartridge makes an electric screwdriver more universal. The equipment changes very quickly at the hexagonal cartridge, and this is a great convenience if the replacement is often made. Often, in the presence of such a cartridge, drills have a hexagonal shank. Perhaps a combination of a conventional cartridge and a hexagonal shank. Reducer is needed to transmit the engine rotation of the engine to the cartridge. The parameters of the twisting moments depend on the gearbox. Reducer gears are made either of metal (usually from steel) or from plastic. In professional screwdrivers, only metal gears are used.
An important technical characteristic of an electric screwdriver is its power, depending on the twisting moments (soft and hard). Twisting moments are measured in NM (in Newtonometers). The tool is more powerful if the number of torque is larger, that is, an electric screwdriver can drive thicker and longest screws or drills into solid or viscous material.
- Soft torque characterizes the maximum twisting or unscrewing of an electric screwdriver. The range of soft torque is 0-350 revolutions per minute.
- The indicator of maximum effort during the drilling is a rigid torque. Its range is 0-1000 (maybe much more than 1000) revolutions per minute.
What is stress?
The voltage shows the amount of energy that the battery produces in perfect conditions. In other words, this is the maximum energy potential of the battery, which is the basis for the production of electric current. Batteries with higher voltage work with more powerful battery tools and provide the energy necessary for the efficient operation of a high torque. Understanding how the difference in battery voltage affects the performance of the battery tool will help you choose the right model.
Drinks with higher voltage work more efficiently in difficult conditions, and, as a rule, they are a little more expensive. The simpler the work, the less energy is needed. That is why many masters prefer to use 20 volt models instead of younger brothers 12 V to perform complex tasks: a higher voltage creates a greater torque. It would seem that everything is clear. The more, the better. But in practice, many work on the repair of the house does not require the same amount of energy as large-scale construction projects, and therefore you simply will not need a 20-volt model. High voltage is equal to a large torque, but also an increased weight, which is far from appropriate everywhere. At home, it is most convenient to use compact and light tools for 12 and 14 volts.
What characteristics are important when choosing a battery for an electric screwdriver
Given the advantages and disadvantages of various types of batteries, you can choose the appropriate for specific operating conditions. Now let’s look at two key characteristics that all types of batteries affect the choice of electrical screwdriver.
What the battery capacity is talking about
The battery capacity is prescribed by numbers from 1.0 to 7.0 and measured in amperes multiplied by the clock (Ach). The value is deciphered as follows: the specified amount of amperes will be able to issue within an hour. But since no electric screwdriver consumes 1-5 and per hour, then its use is stretched from 2 to 8 hours. The higher the container, the longer the tool will be able to stay in work.
What the battery voltage is talking about
In battery models, the strength and rotation speed of electric screwdriver depend on the voltage of the battery, which should correspond to the parameters of the tool:
- For screwdrivers, the maximum indicator is 36 in. These are the most powerful devices for working with metal and solid wood rocks.
- 12-18 V is the average value suitable for most processes in the repair and installation.
- 3-10 V-belong to low-power, and are used only for assembling soft materials or fasteners of small diameter.
The installation of a larger power battery on a weak model will lead to a breakdown of the last. Battery 12 V on the apparatus calculated by 18 V, on the contrary, will limit the strength of the tool, so the storage voltage indicator must accurately correspond to the value on the electrical screwdriver.
Keep in mind that if you take two batteries with the same capacity, the longer operation of the tool will provide one with higher voltage.
Battery or network
Having decided on the class, you will have to decide whether you need a network with an electric screwdriver or battery. The disadvantages and advantages of both are obvious: in the battery above mobility and the cord does not interfere during operation, but it weighs more. Network does not depend on the presence of the battery charge, but there is far from all construction power supply. In general, the choice of difficult. The decisive one can be the moment that the battery electric screwdriver with a good battery is decent more than a similar model operating from the network. The difference is formed due to the presence of a battery-good options for not cheap.
In network electric screwdriver, the length of the cord is important
If you decide to choose a network electric screwdriver, pay attention to the length of the cable. The longer it is, the more convenient it will be to work. You will not have to drag the carrying.
To choose the right electric screwdriver on batteries, you need to pay attention to the type of battery. The duration of work on one charge depends on this, as well as the procedure for storing storage.
Lithuanian (Li-lon). It holds the charge for a long time, quickly charges, have a large number of recharge, almost do not discharge during storage. In general, a good option, but dear. Therefore, probably, it is more common on professional models, where the duration of work on one charge is important. The disadvantages include fear of the cold, which is important in our country.
So, if you choose a battery electric screwdriver for periodic work, the nickel-cadmium battery will work quite. If you use it carefully, it serves for a long time. If you start large.Scale work, it is better to use other batteries. There will be less downtime, work will move faster.
Battery design of batteries
All battery blocks that are used to power manual power tools are arranged approximately the same. There are several standard elements inside the block. The so.Called “cans”. For example, in lithium-ion batteries, the “banks” of the 18650 standard with a rated voltage of 3 are used as elements.6 V and high current discharge, and in nickel-cadmium-elements with a voltage of 1.2 century.
By changing the number of elements and the method of their connection between themselves (sequentially or parallel), you can get batteries with different characteristics. They will differ in working voltage (in practice, blocks of 10 voltage are used.8 V up to 24 V) and containers (batteries of manual power tools have a capacity of 1 Ah to 12 Ah). Some manufacturers (for example, Dewalt) even produce transformed battery systems, in which the order of connection of the “banks” through terminals automatically changes depending on which tool the battery is connected to: 18-volt or 54-volt.
The main varieties and parameters used in the screwdrivers of batteries
Power, duration of autonomous use, torque, reliability and durability of electrical screwdriver is largely determined by the type and specific characteristics of the installed battery. For modern power tools, batteries of four main varieties are used:
- Nickel-cadmium type conventionally denoted by NI-CD;
- Advanced nickel-metallological batteries, which corresponds to the Ni-MH symbol;
- Modern lithium-ion models are different designated by Li-Ion;
- Lithium-polymer batteries, or lipo.
Often a symbol of the type of battery is present in the name of the model of an electrical screwdriver. And after reading on the Bosch GSR10 power tool.8-2LI Professional, we can confidently talk about using the lithium-ion battery, and in the Metabo BS12NICD model nickel-cadmium battery. But in some cases, for example, Rostec ASh1812-2B, the presence of a nickel-cadmium battery can only be determined by the passport of the device.
Nickel-cadmium batteries were created in the 19th century, but their modern design appeared in the 40s of the last century. Despite the development, they continue to be widely used for the battery power tools, due to their key dignity. A combination of low cost with great power of the created current and increased durability, reaching about 1000 charging cycles due to their key dignity. At the same time, they are quickly charged, not afraid of low temperatures and reloading.
However, nickel-cadmium batteries and serious shortcomings have:
- Problem of memory;
- Significant weight and dimensions;
- The presence of highly toxic materials in the design;
- Increased complexity of disposal;
- Self.Discharge at the level of ten percent per month;
- Low specific energy intensity values of about 45-65 in x hour/kg.
The key problem called the memory effect is that if the battery charging begins with a certain charge, then in the end the container decreases by this value.
Important! During operation, the power tool with nickel-kadmiev battery must be completely discharged.
Therefore, many models with nickel-cadmium batteries are equipped with two sets of batteries, for example, Stern CD06-168 B. Despite the large number of working cycles, the duration of the operation of the NI-CD battery due to degradation of the contact material usually does not exceed 6 years. Long.Term storage of such a battery must be made in a completely discharged state.
The second main drawback of these batteries is the high toxicity of cadmium, so such elements are made only in three countries.
The nickel-metallogid battery created in the 80s of the past century were designed to eliminate the problem of the toxicity of nickel-cadmium batteries. They really solve environmental issues and are easily disposed of. Additional advantages are the weight and size of such batteries reduced by a third, an increased container in the range of 60-70 in x hour/kg, a noticeable decrease in memory problem. However, nimh type elements could not squeeze nickel-cadmium batteries.
The reason that blocks the widespread introduction of nickel-metallological batteries was the following shortcomings:
- Reduced to 500 number of working cycles;
- High price;
- Incomplete elimination of memory effect;
- Self-discharge within 7-10%;
- Lack of resistance to low temperatures.
Therefore, their use is limited. Nickel-metallogid batteries also require complete discharge during operation.
Mass production of lithium-ion-type batteries began in 1991 Sony Corporation. Due to their advantages, they practically supplanted in the production of smartphones, tablets, laptops other types of batteries and won a significant share of the battery market for power tools. The following positive characteristics of the LI-Ion elements should be noted:
- Increased specific container at the level of 110-230 in x hours/kg;
- Reduced to 3-5% per month of self-discharge;
- Complete lack of memory problem;
- Excellent environmental friendliness;
- Lack of problems during disposal;
- Reduced by almost 40% weight;
- Accelerated charging.
However, due to a number of shortcomings, they could not completely replace nickel-cadmium batteries. Key problems of LI-Ion Battery:
- High price;
- Accelerated discharge at negative temperatures;
- The danger of complete discharge and reloading;
- Shorter service life;
- The danger of an explosion when hit.
Important! The best conditions for the durability and efficient operation of LI-Ion batteries are provided at charge levels of 20-90%. They cannot be overheated, operated and stored at negative temperatures, blocked and completely discharge.
Due to the processes of lithium breakdown, the service time is limited even without operation.
This video tells about these three main types of battery for an electric screwdriver:
The wireless tool is convenient to use, and its work as a whole does not depend on the presence of an electric socket nearby. For the effectiveness of the use of an electric screwdriver, the presence of a battery is required. Depending on the composition, the properties of the battery differ and represent various characteristics during operation.
On the market you can find a large selection of batteries for construction tools, including the latest development in the form of a lithium-polymer device. The feeding element of the latest generation works on the principle of its predecessor-a lithium-ion battery. The difference is the use of a gel.Like substance instead of a liquid electrolyte.