DIY electric screwdriver repair

In detail: do-it-yourself electric screwdriver repair from a real master for the site my.housecope.com.

Many people probably have electric screwdrivers, battery-powered flashlights, etc. at home. in which the batteries do not pull.

My screwdriver has a fully charged battery for a couple of three screws.

Batteries in a screwdriver, cadmium in flashlights, as a rule, lead, all of them are now quite problematic to get for replacement. That will give us the conversion of devices to lithium.

1. Simplification of charging. Charging from micro usb, no need to look for where you put your own charger or where the wire from the flashlight.

2. The lithium battery is easier to find. For example, I generally took cans from an old battery from a laptop (you can find it either for free or for minimal money).

3. When replacing cadmium. There is no memory effect and you can charge at any time without waiting for a complete discharge.

4. Bigger than the standard battery capacity, often even when using a used unit. cans.

And so what we need.

1. Charge controller board, for example, on the TP4056 microcircuit. It is sold by the Chinese on Ali ebau and other sites. A clip will be sent for a dollar.

Available in two versions with and without overdischarge protection. It makes sense to use it with protection if there is no protection board in the battery itself. For 18650 batteries and the like, the protection board is usually installed on the negative terminal, if the negative is not made of metal, but of PCB glass, then this is the protection board.

The boards are similar in size. (left with protection from right without)

WARNING. For an electric screwdriver, battery protection cannot be used with a protection current of about 3A, and although the total consumption of a screwdriver is not large, inrush currents cut out the protection.

Video (click to play).

Here is a circuit board with battery protection (found on the Internet). Also in the appendix I will add documents for microcircuits.

The Chinese boards have a charge current of 1A if you want to charge from a computer port or from a weak charge, you must reduce the current to at least 0.5A. To do this, you need to replace the 1.2K resistor connected to the second leg of the TP4056 microcircuit with a larger resistor, for a current of 0.5A with approximately 2.4K resistance (the table of charging currents depending on the resistance is given in the document on the microcircuit).

I am planning on being able to charge from a computer and am replacing this resistor. Soldering and cleaning the pads.

Since it was only available with a nominal value of 2.2K, it received a charge current of 0.52A. What I considered acceptable for charging from a computer port.

2. The battery can be either bought a new one or removed, for example, from an old laptop battery.

My battery contained 6 cans connected in pairs. It is advisable to disconnect all the batteries (one of the cans was completely dead in one of the pairs) and measure the residual voltage. If there is a choice, then take banks with a large residual voltage, as a rule, and they also have more remaining capacity, although of course it is better to measure the real capacity. The battery was at 4000 mA i.e. at 2000 mA per jar, the residual capacity was noticeably 1200-1400 mA, depending on the jar.

Metal strips of contacts are welded to the batteries; they do not need to be torn off, but simply cut between the banks. It is convenient and safe to solder wires to them. The metal on the contacts of the batteries themselves is harder to solder and if you hold the soldering iron for more than a second, then there is a danger of overheating the battery, which will disable it until it burns out.

3. Wiring soldering iron tester, files, glue gun, etc.

We remove the batteries and standard charging for them.(if there is a backlight and for the flashlight it is desirable to measure the current of the LEDs on a fully charged battery)

Thinking about where to place the new battery and charging board.

Now, one of the longest stages is the finalization of the case.

To speed it up, it is better to use mechanization.

For example, Chinese cutters.

But I like the old Soviet ones better, they have better control and are less distracted. But unfortunately on sale they are more difficult to find.

We choose the extra plastic, making sure that the mini USB connector is minimally recessed.

We solder the circuit by connecting the battery and charging. And we check the operation of the charging and screwdriver, also if there are lighting LEDs, we measure the current consumption from lithium and the resistance of the damping resistor.

If the current of the lighting LEDs is very different from the current on the standard batteries, then we adjust the resistance of the balancing resistor. I soldered another resistor in parallel.

Next, degrease the body and all the parts with isopropyl alcohol or good gasoline in the shoe (ethyl alcohol does not degrease). And we fill in all the components from the hot glue gun. Excess, if that is not difficult to cut off with a knife.

After assembly, pour glue from a pistol into the holes that are intended to indicate charging.

When the glue has cooled down a little, it is easy to clean off the excess. As a result, the glue acts as a light guide and the battery is clearly visible when charging.

Alteration of another screwdriver. Now the battery can be charged without removing it from the screwdriver.

The battery is removable. (After the alteration, a micro USB connector and a charge indicator appeared on it)

A set of cadmium batteries and contacts were attached directly to the batteries.

With the help of hot melt glue I made a clip of contacts.

I placed the charger in the back and soldered all the components.

Redesigning the flashlight with a lead battery and charging from the mains took even less time since nothing had to be undermined.

Looking through the boxes with various junk the other day, I came across an Einhell bavaria bas 3,6 electric screwdriver.

As pictured, only model 3.6.

The battery on it ordered to live for a long time, so it was thrown down and was not used. Not to say that it is a convenient and necessary thing, but hands itched to restore it.

As batteries, there are three 1.2V batteries, with a capacity of only 800 mAh. We throw them out right away, already mentally trying on an 18650 can in their place, and preferably two.

At first I thought to install them directly into the handle, but the inner diameter did not allow it to be done.

Well, let's do with one, since a recent measurement of the capacity gave the result of 1850 mAh.

Then the question arose of fixing the battery, I wanted to leave it removable and quick-change, a holder ordered from China came to the rescue, although it was for 3 elements, but this is not a problem.

We mark, cut, try on.

Not bad already, continue fitting. We solder the wires, simultaneously filling everything with glue.

The battery is installed, it's time to think about charging it. For this purpose, we will use the module on the TP4056, I did not take a photo, but there is nothing special there - we try it on in place, solder the wires and fill it with the same glue from the pistol.

The connector did not come out very beautiful, but this does not in any way affect the functionality and strength, and thanks to the glue, the charge indication is now clearly visible - the glue around the connector is highlighted.

This is what the electric screwdriver looks like now.

Bottom line: operability is restored, the battery has become quickly replaceable, any power supply unit with a wire is suitable for charging.

Well, as a bonus, the removable part can be used as a charger for 18650 batteries.

I did it slowly in a couple of hours, took pictures on Xiaomi Redmi Note 3

the key point in all such posts is to find an electric screwdriver, a screwdriver, an American shuttle in your trash.

Lived up to the time when imported junk falls under the joke "finalize with a file"

funny, I'm at work on the contrary, threw out the lithium and put 3 nickels. I have been using it for the second year

Tell me where did you get good banks?

Gutted laptop batteries

All 6 cans do not die in them at once =)

These batteries can be easily bought for a penny at any electronics repair service.

I took so quite usable 18650 at 30r / pc))

Yes, it so happened that we gave away a couple of laptops with live batteries

Well, here's the xs. Screwdriver - normal. And this?

Yes, I am so skeptical about this thing. I have a Zubr screw. You know, it works fine. I don’t know any problems with him. Apart from the moment when Akum sits down. A boy friend has a Makita screw. Small, lithium in a pen. Replaceable blocks, but not visible. In the sense that the block does not stick out from below, as the magazine enters the pistol. He collects cabinets. Also, he says, he does not know grief. But, as in a laminated (pressed chipboard with a coating), to drive screws into a container, this is one thing, but like into a coating. Sometimes it is necessary to tighten it with a screwdriver. Straight, make a lot of effort. How this screwdriver will go there, screw it in - I do not know. And install the doors? Screw the box to the wall. There material and aerated concrete, and brick, and stupid concrete in monolithic. What is there to twist to her? Sometimes work with a mixer, sometimes drill. Probably, these screwdrivers for other tasks. Disassemble the technique.

There is a discharge indicator on the charge controller, otherwise by eye)

Yes, I was probably wrong about the discharge indicator. But this is not critical to me.

In terms of functionality and dimensions, the cordless screwdriver is in the middle between a regular screwdriver and a screwdriver. Due to its lightness and compactness, this electric screwdriver works quickly with different fasteners compared to a manual screwdriver. It is used for the assembly of furniture, repair and maintenance of various equipment. Plus, the tool can be made by hand.

The cordless screwdriver is used for screwing and unscrewing various fasteners into non-solid materials, for example, made of wood. The screwdriver battery is built into the handle, so the tool is small. The device can be used where there is no need to drill and tighten the fasteners too much, to work in narrow places and openings in which a screwdriver cannot fit.

The rechargeable screwdriver is used in the assembly of furniture, installation of windows, repair of household and computer equipment, maintenance of cars, when performing small household work.

The tool is characterized by parameters that you need to know about:

battery voltage. This characteristic is equivalent to the power of network devices. With increasing voltage, the device has a greater efficiency. The maximum value is reached with a fully charged battery. Decreases over time until the screwdriver can still be turned on. During storage, the voltage also decreases. Therefore, after a long period of non-use of the instrument, it must be fully charged;
battery type. There are three types of batteries used in screwdrivers:
- nickel-cadmium Ni-Cd. Cheap, resistant to different temperatures. Due to their low resistance, they have high charge and discharge currents. They can be charged about 1000 times. But they are toxic due to cadmium, have a memory effect and a small capacity;
- nickel metal hydride Ni-MH. The memory effect is less than that of nickel-cadmium. Due to their higher density, their capacity is 25–35% larger than previous ones with the same dimensions. Not harmful to the environment. But they have less charge. It is undesirable to discharge them to the end;
- lithium-ion Li-Ion. They have the highest capacity. Due to this, they are reduced in size. They have no memory effect at all. Discharges very slowly during storage. But they also have their disadvantages. Higher cost, shorter service life and poorly tolerate high and low temperatures;
- Battery capacity. The operating time of the screwdriver depends on it.At high speeds under load, energy is consumed faster, so the operating time also depends on the intensity. Lithium-ion batteries may not be fully recharged for fast charging;
- battery device. There are two types of battery for a cordless screwdriver:
  - removable. Installed in powerful devices, charges quickly. Allows you to work continuously if there is a replaceable battery;
  - non-removable. located in the housing. Such a tool is light in weight, size and cost. It is convenient for them to use. But the capacity is also small, so you have to charge it often. This can lead to work interruptions. After all, the battery cannot be removed from the case, and another cannot be put in its place;
  - charging time. Depends on the type of battery and ranges from 1 to 10 hours;
  - maximum torque. It determines the force of rotation. When interacting with the material, the moment decreases. Using the tool at high loads leads to a quick loss of battery power and wear of the screwdriver elements;
  - maximum number of revolutions. This is the rotation of the shaft. With a high-speed screwdriver, self-tapping screws can be easily screwed in.
  The main elements of the cordless screwdriver:
  1. Power button.
  2. Electric motor.
  3. Reducer.
  4. Spindle with tip. Some models have a cartridge.
  5. Battery.
  6. Power and battery indicator.
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  Cordless screwdriver device
  
  When the power button is pressed, the circuit is closed. The battery supplies energy to the engine. He starts to work. The rotation is transferred to the gearbox and to the tip with a hole. A bit or adapter is inserted into it to enable the use of nuts.
  
  A screwdriver can replace a cordless screwdriver, but a screwdriver is not always. Although these tools are similar in appearance, they have significant differences.
  
  This is not to say that this or that instrument is better than the other. The screwdriver is good for its power and drilling capability. And the screwdriver is convenient for its small dimensions and weight.
  
  Compare your needs and the money threshold for buying. Check out the types and technical characteristics of screwdrivers.
  Types of shape of cordless screwdrivers:
  Cordless screwdrivers are classified into household and professional. The latter are distinguished by greater power due to their high torque and rpm.
  
  When buying a tool, pay attention to the technical characteristics and additional features:
  
  A number of the most popular models for home and domestic use stand out:
  An electric screwdriver is a hand-held electric tool with various attachments, driven by an electric current. This article discusses some of the disadvantages of this tool, such as a weak battery, and how to solve them. As well as methods for extending functionality.
  
  Such a screwdriver is a very convenient device that can be used not only for twisting, twisting, but also as a miniature low-speed drill. Personally, I do just that - I bought an inexpensive nozzle-collet and I don’t know any problems. Figure 1.
  
  It is very simple and convenient, but they all have one problem - weak batteries. It is not surprising, because despite the fact that the device is very cheap, it is not in great demand, since the electric screwdriver is low-power, it is best to take a miniature screwdriver - and do not suffer.
  
  And if you do not add power to the screwdriver in any way, then a significant drawback of bad batteries, which, as a rule, sit down at the most inopportune moment, can simply be replaced with more capacious ones.
  
  I recommend that you consider two tips:
  
  1) Gently unscrew the screwdriver, and pay attention to what kind of batteries are there, and how they are connected. If there are simple AA or micro-finger AA batteries, then you are in luck, you do not need to invent anything - just buy more capacious ones and implement them instead of the old ones, just do not confuse the poles of the batteries! Install the new ones exactly in the same place and in the same way as the previous ones were installed.
  
  2) You can slightly alter your electric screwdriver so that it can be powered both from batteries and from a power supply. Personally, I did just that (picture # 2).
  
  Figure # 2 - Appearance of a converted electric screwdriver
  In the body of the screwdriver, I drilled a hole for the wire. Then he threw out her own batteries and connected a wire in their place. After that, I took batteries with a capacity of about 11A / h and stuffed them into a box of a suitable size, picture No. 3.
  
  Figure №3 - Box with batteries
  Now I can use a screwdriver for a week on the battery box because 11 Ah is more than enough. Or plug the connectors into the sockets of the power supply and work with power from it.
  
  People who are engaged in home-made construction are probably trying to do something useful for everyday life. Ideally, the greatest satisfaction will be caused by useful constructions that simply do not exist and are impossible to buy. It is getting harder and harder to do such a useful thing. But you can also get benefits from home-made designs that perform the functionality of purchased devices, but cost much less in price. I propose a method of manufacturing a device at a price significantly lower than a finished device in a store.
  
  Roller blinds, thanks to their convenience and practicality, penetrate into our everyday life. A curtain bought at one time very well protected the room from sunlight. But in addition to cheap curtains, there were also curtains with a mechanical drive on sale at a price 8 to 15 times more expensive than ordinary curtains. It was possible to build a curtain with a motor by purchasing parts for 300 rubles (2009).
  
  1. An electric screwdriver bought at a sale for 250 rubles is used as a curtain drive. The screwdriver kit included a set of not-so-bad bits, bit extenders and a charger. One bit extension is required for the device.
  
  2. Disassemble the screwdriver. The screwdriver is powered by 3 AA batteries of unknown capacity.
  
  3. Disconnect the battery compartment and extend the power wires from it to a length of 2-2.5 meters.
  
  4. The block of the electric motor and gearbox in my case had to be modified, since the electric motor had to be placed in the narrow space of the window opening. The revision consisted in shortening the body.
  
  5. The connection unit of the drive with the curtain is clear from the photograph. In a cable gland of a suitable diameter, a bit extension is attached. The gland itself is installed in the end of the curtain winding body instead of the standard plug. The oil seal must be tightly fixed at the end.
  
  6. The drive is attached to a construction bracket fixed in the window opening. Initially, the engine compartment was secured with cable ties. Subsequently, the screeds were replaced with staples made of construction tape.
  
  7. Having secured the engine, mount the curtain. The curtain must be installed strictly horizontally.
  
  We control the operation of the curtain using a reversing switch on the power supply. The goal was to install stationary power and automation on the curtain, but more on that in the next blog.
  
  Everything is fine, except that this is not a Roman blind)
  
  This is a roll curtain. Roman is assembled as horizontal veneers.
  
  Cordless screwdriver overview
  
  There is always a screw in a residential building that needs to be tightened.Either assemble a festive table that, in anticipation of the guests, was gathering dust for six months under the bed, then the hooks in the bathroom should be changed to more modern ones. Not to mention those cases when repairs are planned. The scale of work is increasing, and it is more and more difficult to screw it with your own hands. This is where cordless screwdrivers come to the rescue.
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  At the end of the 19th century, the first electric drill appeared, then the screwdriver, which you can work with without being tied to the source. The drive for minimalization has led to the birth of the compact cordless screwdriver. And it is hoped that new lightweight models with additional features and possibly lower prices will be available soon.
  
  Before you go to the store for a power tool, decide what you need this assistant for. If the work is going to be large-scale, for example, you are engaged in the interior decoration of a newly built summer house, you may not be able to do without a semi-professional screwdriver. But if the upcoming work is not so voluminous (you plan to assemble furniture) or you need to wrap the screws in hard-to-reach places, where you can't get to with a massive unit, or you are going to assemble a computer yourself, it's time to study the market for cordless screwdrivers. You must take the choice seriously, because the tool will serve you for years. With the right approach, it will delight you for many years and will undoubtedly save you a lot of time and effort.
  
  The first thing that makes the screwdriver work is the rechargeable battery. Nickel-cadmium (NiCd) and lithium-ion (Li-ion) models are currently used. Each has its own advantages and disadvantages. The first ones are unpretentious: they are quick and easy to charge. They are durable: with proper maintenance, they can withstand over a thousand full charge and discharge cycles. But what does this figure mean? Imagine it would take a semi-professional model, operated five days a week for eight hours, more than three years to cross that milestone. After that, the capacity of the battery will gradually decrease, which will serve as a signal to replace it. The procedure is short-lived, it is performed in electrical equipment repair shops.
  
  However, if you do not adhere to the rules of operation, the battery will not work at full capacity. We have all heard about the memory effect - this is the name for large crystals that form if the gadget is not completely discharged or stored and used for a very long time. However, their occurrence is easy to prevent - you just have to remember the device plugged into the outlet longer than it should be (especially for more than a day) and periodically arrange a kind of gymnastics, completely discharging the battery.
  
  But such models have no restrictions on operation at low temperatures, for example, in an unheated dacha in a harsh winter period. In addition, they are unpretentious in their work and not capricious, which is quite important at a construction site.
  
  Unfortunately, they are not without their drawbacks. In addition to the listed correct charging mode, which is not always convenient for you to observe, nickel-cadmium batteries tend to self-discharge. In particular, on the first day after disconnecting from the outlet, a tenth of the received energy will "evaporate" from the device on its own. In addition, they are larger than their modern counterparts, which is a minus in the case of miniature cordless screwdrivers.
  
  Lithium models have been waiting in the wings for a long time: although the first experiments with them took place back in 1912, it was possible to "tame" smart drives and release them to the market only in the 70s. But the first examples were still dangerous and often exploded. A number of serious improvements were required so that the manufacturers did not have any concerns. Nowadays, lithium-ion batteries are most often made from graphite and lithium cobalt oxide.
  
  However, the efforts were not in vain. The main drawback of unpretentious NiCd has been overcome: the ability to self-discharge.Modern smart batteries will lose only 2–5% in a month. That is, if you energized the screwdriver in the winter, but took it in your hands only in the summer, the device will work, and will not shut up, having made a couple of turns "for decency". For convenience, you have to vote with a ruble: Li-ion is an expensive battery. True, manufacturers are constantly looking for ways to reduce the cost of a product.
  
  Continuing the story about the heart of a magic screwdriver, we note the importance of observing safety precautions. If you have children, keep the instrument away from young physicists. Interest in how the battery works, an unbent paper clip thrown from plus to minus (the same short circuit), piercing the case with nails or other metal objects, connecting in reverse polarity, throwing it into a fire (naturally, for scientific purposes) can lead to education lithium metal on the surface of the electrodes and the explosion of the cell. With proper operation, there should be no undesirable consequences.
  
  But regardless of the type of battery, high-quality devices charge for one to two hours and tighten five times more screws than their simpler counterparts. And in order not to keep you waiting, some manufacturers (for example, Metabo, DeWalt, Makita) complete the tool with two batteries at once: while one is working, the other is powered from the outlet.
  
  Among all the seductive advantages of the device, one can single out those without which it looks more like a toy, not a tool, and those that are convenient, but not required. However, no one has the right to decide for the buyer what functions are required.
  
  For example, driving a screw at too high a speed into dense wood can damage the material. Are you not familiar with cases when, instead of carefully entering, the screw squeals, wriggles, changing the trajectory - that is, it makes the hole uneven, sloppy. This is possible if, in soft wood, he stumbles upon a denser knot. Adjusting the speed will help to avoid this - the lower it is, the denser the rock the self-tapping screw will take. But if you are going to assemble the shelves, they already have holes of the required diameter - this function is optional.
  
  From where you have to crawl with the tool, depends on how many positions of the handle are needed and whether the backlight becomes so necessary. Or, say, a shock-resistant case, which is generally a useful thing, prolongs the life of the device, especially if you tend to drop it or leave it on the floor, and then touch it with your feet when walking. But those who work at the table, and not at the "construction site", do not really need it. Think about your own convenience as well. If you intend to work for a long time, you cannot do without a rubberized handle, which will relieve tension from the hand, and even prevent the tool from wriggling out of the palms. Before making a decision, do not forget to "try on" the model you like, hold it in your hands.
  
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  A good cordless screwdriver tip should engage tightly with the screw head to prevent slippage. For this purpose, it is roughened by spraying a special composition.
  
  The cheapest model on the Moscow market costs almost as much as a set of manual screwdrivers - 450 rubles. For this price, you will purchase a tool complete with fifteen bit bits, with a 1.2 Ah battery, idling 150 rpm and a maximum torque of 2 N ∙ m. It will take seven hours to charge its nickel-cadmium battery (almost a working day). Such a budget version of the additional options is equipped only with a reverse. And by weight - about 600 g. To his "die-hard classmates", similar to him in skills and characteristics, include models for 700-900 rubles.
  
  A little more expensive (1–1.5 thousand rubles), you can buy foreign and domestic tools, already equipped with handles that fold and thereby allow you to crawl to the most capricious screw.Due to its compact size, the battery capacity is also not very high here.
  
  The next price group includes those tools that resemble a pistol in shape. They are distinguished by an ergonomic design, the handles of many are covered with a rubber sticker, so that the screwdriver will not slip out of the hands of the master. Some are backlit. There is no need to talk about speed control. Most of them are 3.6 watt models. This category includes both nickel-cadmium and lithium-ion. They will have to spend on average 1.5-2 thousand rubles.
  
  Professional models stand apart. They are more weighty than their younger brothers and in the literal sense (1 kg compared to 0.5-0.7 kg in previous versions), but they also know how much more (for example, rotate at a speed of up to 750 rpm), and they work at higher voltage and longer. True, the price for such units is already completely different: from 2 thousand to 8 thousand rubles. depending on the tool model and equipment. Charge them for a very short time: from an hour to two.
  
  There are a wide variety of models on the market. The most popular of them are: DS 36N, KC 1036, KC 9036, KC 9039, VAT4801 K, B4E, OA-4,8, 2972 Dill Gun, AS 72.
  
  In the store, it is better to hold all the goods in your hands. See if it is comfortable, does it seem heavy, ask the seller for a sample so that you can test different models on your own. Consider whether you will have to work in places where there is no electricity at all. In the latter case, you need to choose a model based on the capacity of its battery, and buy additional batteries for it.
  
  Take whatever you like. But this advice only applies to world-renowned brands that have established themselves in the field of power tools. If you have coped with the difficulties of choosing, now is the time to test the miracle screwdriver in practice.
  
  Published by admin in Tools and Technique 18.04.2018 0 55 Views
  
  Comparing an electric screwdriver with a screwdriver is at least incorrect - they are two different tools that are not always interchangeable. If the drill is able to change the screwdriver, then the electric screwdriver is not even suitable for it. However, this does not mean that it is considered a useless thing. Quite the opposite - not in all situations it is impossible to do without it. Especially when it comes to the everyday use of this tool. In this article, along with the site stroisovety.org, we will talk about the electric screwdriver and its capabilities - moreover, if you want that this tool is necessary for you, we will talk about how to choose it correctly.
  
  How to choose an electric screwdriver
  
  The most important feature by which you can distinguish an electric screwdriver from a screwdriver (at least visually) is the size of the tool. The electric screwdriver is generally smaller and fits very easily into the pocket of a jacket or jacket. But, understand, these are only visual differences, on the basis of which it will be wrong to judge the instrument itself. In general, these tools have a lot of differences, and we will try to learn all of them - this moment will give you the opportunity to form with the question of what to pick up, an electric screwdriver or a drill?
  
  In addition to everything else, there are other minor disadvantages of this tool, but, again, it must be borne in mind that they are revealed only against the background of a screwdriver. with the same success, the drill itself can be called a useless tool if you compare it with a powerful electric drill - but, you must agree, this is not true, since these tools are different, not paying attention to their own similarities. And as for the positive qualities of an electric screwdriver, they all lie in their compactness and narrow purpose - there are similar situations when a heavy and large drill is simply not able to screw the same screw due to the small space for work.
  
  As you already know from the above, there are two main options for electric screwdrivers - corded (mains) and cordless electric screwdrivers, which we will talk about further.
  
  Electric screwdriver network photo
  
  In general, there is an insoluble difficulty, the answer to which is very simple and at the same time difficult to find. By an impressive account, the selection at the same time and a different type of electric screwdriver is due to the presence of electricity at home. But few are as lost as it might seem at first glance - there are mixed models of electric screwdrivers, which, as a rule, will work both from the mains and from the built-in battery. The device of such an electric screwdriver can be compared with an uninterruptible power supply unit - you plug it in, and it works well as long as there is voltage in it. As soon as the current disappears exclusively in the outlet, it switches to the batteries. In principle, this is the best solution to the question, which electric screwdriver to choose?
  
  Today's market for tools for construction work flickers from a variety of types and subspecies of various devices, and electric screwdrivers are no exception. You can successfully choose both an affordable copy costing a couple of hundred rubles, and an expensive one. But the cost is not the main thing here, it is not at all considered an indicator that you need to look at when choosing an electric screwdriver - naturally, you should not buy a very inexpensive tool (this is wasted cash), but you can look for the optimal middle. Basically, the middle peasant is less practical than the more expensive models, but, nevertheless, he completely copes with his own work.
  
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  When choosing an electric screwdriver, you need to pay your own attention to its capabilities in work and to certain factors that determine its comfortable use. Such moments include the following.
  1. The most important thing is the type of battery, on which the possibility of a long operation of the tool and its working life depend. Today's screwdrivers come with both lithium-ion and nickel-cadmium batteries - the former usually endure a decent number of discharge and charge cycles and last a little longer.
  2. Ease of use. In this respect, there is nothing better than fitting, no - take a screwdriver in your hands, imagine how you work with it and just evaluate your own feelings.
  3. It will be useful to pay your own attention to the technical characteristics of the tool - charging speed and current, weight, number of revolutions, torque and other parameters largely affect the functionality of the tool in general. The higher these characteristics (of course, not counting the mass), the better.
  4. The presence of additional practical devices. These include switching the speed of rotation of the screwdriver head. A swivel mechanism that makes it possible to get close to a screw or self-tapping screw at any angle, a change in torque (changing the force, depending on the length of the screw, you can save energy) and reverse. Surprisingly, but not every electric screwdriver is equipped with a reverse function.
  Electric screwdriver rechargeable photo
  
  In general, the idea and principle of selection is clear, and there is nothing unusual here. One thing to keep in mind is that the more add. a screwdriver has functions and the higher its technical characteristics, the higher its price. It is necessary to select a suitable option - to select the optimal middle, i.e. a tool that will suit you in terms of cost, technical indicators, and practical capabilities.
  
  Here you can add a little - in particular, say a few words about the purpose of the electric screwdriver. The fact that it will not work to replace the screwdriver will not work, you already know, you only need to determine its scope of use.By an impressive count, the electric screwdriver is considered the classic option for delicate work that does not require drilling and tightening screws or nuts.
  
  An electric tool is much more convenient to work with than the usual hand tools, it allows you to work faster and more thoroughly. So, among home craftsmen and professionals, an electric screwdriver is popular - a reliable replacement for an already obsolete manual screwdriver. With the help of an electric screwdriver, you can perform delicate and responsible work, when the strength of the entire structure depends on the quality of tightening the fasteners.
  
  Thanks to its compact size, the electric screwdriver can be used in hard-to-reach places. Besides the small size, the big advantage of the electric screwdriver is flexibility - many models can be bent at different angles to make it easier to work. It should be understood that an electric screwdriver, despite a similar scope of application, is significantly different from a screwdriver. First of all, the difference lies in the power of the electric motor - with the help of an electric screwdriver, the fasteners are twisted only into the prepared nests, while the screwdriver allows you to screw the screws into an unprepared surface. So why not choose a screwdriver, you ask. Here's why:
  - the screwdriver is much more bulky;
  - a high-quality screwdriver is very expensive, and purchasing a cheap and low-quality tool is unprofitable;
  - it is unprofitable to use a screwdriver for simple tightening of screws and screws.
  Electric screwdrivers of various shapes and sizes are on sale today. The most common are straight, pistol screwdrivers and L-shaped electric screwdrivers. Regardless of the shape, any electric screwdriver has a massive handle, which houses an electric motor, a rotation gearbox and a battery. The battery of the electric screwdriver is very compact, so the tool itself is also small. This is also one of the differences between an electric screwdriver and a screwdriver, in which the battery is quite massive. The direction of rotation of the electric screwdriver gearbox can be changed, so that with the electric screwdriver you can either tighten the fasteners or unscrew them.