What to do if bit by a screwdriver

Table of Contents:

Service cost by manufacturer

This defect occurs with the following manufacturers:

The causes of the defect sparks inside and smokes

Based on the experience of our service engineers, we can distinguish the following reasons:

  • Untimely prophylaxis and cleaning of the device
  • Lack of protection against power outages
  • Replacing consumable accessories
  • Not carefully studying the user manual or ignoring the manufacturer’s advice.
  • Not neat use

Bring your equipment to our service centers or call the masters at home and We will repair and give a guarantee. After that, the faulty device will work 100 percent (at full). Addresses of Yamedia services in all districts of St. Petersburg.

What to do if the screwdriver smokes?

Contamination of the collector, armature and stator can be removed by flushing in white spirit and mechanically cleaning the tracks between the lamellas. In other cases, if the screwdriver smokes, but it works, you will need to replace the brushes, repair the screwdriver button or the electric motor as a whole, since rewinding the winding is at a price comparable to the cost of a new unit. The masters of the service center “Successful Technique Service” will be able to perform these works quickly and inexpensively.


If you own the necessary minimum of knowledge, time and tools, you can try to diagnose the breakdown yourself. What to do if the screwdriver smokes:

  • turn off the power;
  • disassemble the tool body to gain access to the main functional electrical and mechanical components;
  • clean the internal cavities and working parts;
  • conduct a visual inspection of the wiring, armature and stator windings, brushes, bearings;
  • repair or replace defective units.

We will eliminate the defect for 1200 rubles excluding details

Below you can familiarize yourself with the latest repairs of our clients who have addressed the problem “sparks inside and smokes a screwdriver”. The final price is presented, taking into account the replaced spare parts and diagnostics performed. All repairs are guaranteed. There are daily discounts for the service.

Click on the repair you need to find out more.


Electrical Life Defect Read
Hitachi DS 120VF3 Sparks-smokes details
Repair time: 1 day. (Issue date 2019-12-31)
Performed work: Replacing the motor, repressing the gear. Repair of the button of inclusion of speed.
Spare parts cost: 1000 rubles.
Service address: Prospekt Nauki, 21k1 (shopping center Torgovy dvor Archimedes, 1st floor, room 7A.)
Craftsman: Igor Zadirienko
Warranty period: 1 month

Hitachi ds 12dvf3

Bosch Gsr 120-li

Hammer Acd 120c

Average time: 10.8 days | Average price of work: 2250 rubles. | Average price of spare parts: 1250 rubles.

Types of faults

The situation in which the screwdriver smokes during operation is typical mainly for a power tool. in models with a battery, this is prevented by low voltage and low power. In any case, similar reasons can cause the appearance of smoke:

  • worn brushes. a sign of this is active sparking observed through the ventilation holes;
  • collector pollution;
  • closure of the stator winding turns. while the arcing of the collector can be moderate;
  • malfunction of the button, causing it to heat up and burn the plastic parts;
  • ingress of fine mechanical fractions (dust, dirt, shavings).

The screwdriver smokes what to do

The screwdriver is smoking. How to fix it?

First of all, when a screwdriver smokes or smells burnt, you need to turn it off. The reason for this is the work of the screwdriver with a large overload. If it was quickly turned off, it may not have completely burned out and it can be restored. The screwdriver must be disassembled, remove the electric motor and carefully inspect it. In the case of a pungent burning smell, it is most likely that the screwdriver burned out completely. If you smell just a little, the motor windings should be carefully inspected. You also need to inspect the engine manifold. If the insulation of the winding has only darkened or the insulation breakdown is spotty, then the electric motor can still be saved. To do this, you can impregnate a point violation of the insulation with nail polish. When the winding darkens, but there is no insulation violation, you can turn on the screwdriver for a short time without load. It is quite possible that he will continue to work, but you need to be careful with him. Better to check the winding with a multimeter. than once I had to reanimate electric motors in this way.! [] 1

If your screwdriver smokes and a characteristic smell appears, then:

  • Unplug the tool. It should not work at this moment and should not be connected to the network.
  • Make sure that the smoke is not coming from the workpiece that you are working with the screwdriver. For example, if you use the drill function and work at high speed, the wood may become hot and burn.
  • If possible, disassemble the disconnected screwdriver, getting to its electrical components (to the engine, in particular).
  • Inspect everything about the winding carefully. In case of local burning, if it is barely noticeable and has a scanty area, try to restore the varnished layer by saturating the problem area with varnish. Easier if it is on the stator. But the burning out of the varnish threatens to breakdown.
  • Remove dust and sawdust carefully.
  • If the breakdown is eliminated in this way and there is no burning smell when you turn it on again, then continue to use the screwdriver with a reduced load, lubricating it. The load scorches the varnish. Low voltage can make it work.
  • In case of other violations (anchor, brushes, bearings, wire or the impossibility of diagnostics), appropriate repairs are required, which can be carried out, if not by a qualified, then an experienced person. If repair is not possible, choose a more powerful screwdriver.

Well, what to do. we will repair it, if you did not go to the service but came to us for advice. It is clear that for this you need to know at least the basics of electrical engineering (terms and concepts)

Cordless screwdrivers (screwdrivers) generally quite rarely can smoke, in comparison with a mains tool powered from a 230 Volt network. This is due to both low voltage and lower power (speed) But for both, the main sources of smoke, I judge from my own experience, can be.

eaten brushes (you can see a lot of sparks in the ventilation holes);

turn-to-turn closure of the stator winding (smoke also comes from the ventilation holes, but the collector does not spark much);

malfunction of the on / off button (the button heats up, smells, a crackling sound is heard when turned on);

extremely unfavorable operating conditions. dirt, dust, foreign particles in the engine (smoke, noise, ventilation holes are clogged. This often happens during large-scale repairs. strobing, etc.)

Identify the source of smoke and odor and proceed with the repair.

  • The simplest thing is if the brushes are burnt out. We just change them to new ones, better original ones. It happens that the brushes wear out to the point that copper contact wire embedded in graphite begins to shuffle along the collector. sparks like from a sparkler, the smell of burning and smoke. New brushes will initially spark slightly more than usual until they reach a radius equal to the collector diameter.
  • If the winding is punctured, then little will help here except rewinding, even filling with varnish. Better to change immediately. Yes, and body movements for possible resuscitation of a closed engine are not worth it, a new dvigun even for Makita and Bosch costs no more than 1,000 rubles. And Interskolovskie or Prorabovskie for 300-400 rubles.
  • Very often, heating, an unpleasant smell and even smoke comes from the plastic of the power button. It has contacts, and from frequent on / off. they of course spark and heat up, the heat is transferred to the plastic case, which smells and smokes. My advice in this case is to change the entire button (to clean up and bend the contacts. what a dead poultice)
  • We’ll have to clean and rinse. Just do not follow the advice of clever people who say that you can rinse the cordless screwdriver by lowering the collector assembly into white spirit and working with it for a few minutes. this is nonsense. For cleaning, you will need to disassemble the shura. This is usually 6-8 bolts on one side of the body. Some bolts may be under the plugs, be careful. Unsolder and remove the motor. Here it is separately and will need to be rinsed. Clean the furrows between the collector sipes. Dry thoroughly! After drying, check it for an interturn short circuit (short circuit) while it is not connected to the switch (if you do this right in the shura, you can easily burn off the working transistor of the switch. At least one wire from the engine must be unsoldered!). The engine is checked by simply connecting it to the original battery of the screwdriver. If the engine works and does not smoke, then everything is in order with it. If it smokes or even smells stronger than usual, change the engine, it is already, if not closed, then scorched. A “roasted” engine very quickly kills the battery, which usually costs five times more than the same engine.

After cleaning the housing, lubricate the bearings and assemble the screwdriver.

A considerable number of users have encountered a situation when a screwdriver from Bosch, DeWalt, BlackDecker or not so famous, but no less popular brands in the Russian Federation, started smoking. Various malfunctions can cause smoke to appear. Depending on their location and severity, it is possible to “resuscitate” the device with little financial cost, or more expensive repair of the screwdriver will be required.

The device has broken down. what actions?

There are two ways to solve the problem. The first is to try to fix the breakdown on your own, having studied the information on the Internet, the second is to hand it over for repair to any one of the 21 Umedia services. It is not the first time that we have eliminated the malfunction “sparks inside and smokes a screwdriver” and we want to share our experience with you, to guide you on the cost and terms indicated in the table below.

General rules for charging the battery

If you do everything right, the battery will last a long time. Here are the basic principles for properly charging a screwdriver:

If the battery is being charged for the first time, it must be fully discharged and then fully charged before use.

The temperature in the room should be between 10 and 40 °.

To prevent the unit from overheating, it is necessary to disconnect the storage battery (accumulator) from the charger as soon as it is charged.

If the screwdriver is not used for a long time, it is necessary to recharge it once a month for preventive purposes.

How to properly charge a screwdriver battery: 3 best ways to charge

This article explains how best to handle the cordless screwdriver in terms of charging and storage. The manual also tells you how you can recharge your power tool without the supplied charger.


A device that allows you to diagnose the malfunction of elements on your own.

The main types of such devices:

  • Control lamp (dial tone). equipped with two wires and makes it possible to determine the breaks in the wiring of the electrical appliance.
  • Pointer. a device with a digital scale and an arrow. Such models are not very convenient to use. So that the numbers are clearly visible, the measurement scale should be half a page in size. In addition, such testers are often distinguished by confusing graduations and can only be operated in a horizontal position.
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Tip: If you need an inexpensive multimeter, 94W101 will do.

  • Digital. with LCD display. The scale only shows absolute values. The switch, as in the previous case, is manual. The tester is not suitable for AC.
  • Automatic. as the name suggests, this type of testers does not require manual adjustments of the regulator position. It is enough to indicate the required value using a special button.

Universal charger

An option that will fit almost any battery. Usually this is a model with crocodile clips. Often the user has the ability to set the required values. The method will not harm the battery, since the charging process will proceed in the same way as with the complete charger.

Battery Storage Tips

In order for the battery to serve for a long time, it is necessary to store it correctly:

  • Do not leave the battery in the instrument.
  • The place must be dry. Dampness negatively affects battery components.
  • Avoid sudden changes in temperature.

These were general requirements, details are in the table.

External sources of electricity

The option described above also belongs to the category of external devices for charging the battery. Alternatively, you can connect the instrument to a different power source, such as an old battery, to act as a power bank. The main thing is that it is working and has identical parameters. But here remarkable knowledge of electrical engineering is required: it is necessary to create a chain with the help of crocodile adapters. You will need a 10 amp fuse, and you will also need to use oversized wiring.

Tip: if you need a power tool for a long time, it is better to choose a model among professional options. Their batteries are much more powerful than household models.

The nuances of charging various types of batteries

Most of the features that need to be taken into account are described in the first section. Here. about how long the power tool should be kept on charge.

How to disassemble a screwdriver

Screwdriver. it is the only technique that ideally combines compactness, energy independence and high functionality. A wide range of tasks can be done with just one small tool. from simple tightening of self-tapping screws and creating holes in soft materials to complex precision work in a large volume.

Compared to other devices of this type, the screwdriver has gained great popularity not only among people involved in construction and repair, but also among home craftsmen. Therefore, he can be safely compared with a man, if he is, then your shelves will be well fixed, pictures are hung, and furniture is securely assembled.

However, despite its many positive qualities, situations may arise when it is necessary to completely disassemble the product in order to change the lubricant or replace worn out and defective parts. Of course, the right decision in this situation would be to visit a service center. But when there is no time for this or the warranty period has long expired, there is only one way out. to restore its performance on your own.

How to properly disassemble a screwdriver

All products are outwardly similar to each other. The design has a characteristic pistol shape, the body is made of durable shockproof plastic, and a keyless chuck is used to attach the working equipment.

Before you start disassembling the tool, you need to study its main components in detail. Since the most popular is battery-powered technology, we will consider it.

The internal filling of the device consists of:

Push button
Regulator of revolutions
Planetary gearbox

Step-by-step instructions for complete disassembly of the screwdriver:

Disconnect the battery pack.
Use a Phillips screwdriver of the correct size to remove the screws that are around the perimeter of the entire case.
Unscrew the screws and detach the case without sudden movements, holding small structural elements.
Pay attention to the speed switch, start and reverse buttons. In order to avoid breakage of these small parts, it is recommended to carefully disconnect them.
To get the gearbox in your hands, release it together with the engine from the second half of the case, hold it in your hands and turn it counterclockwise.

Screwdriver gearbox

It consists of gears and gears interconnected with each other. All small components of the mechanism are compactly placed in a rigid plastic case (crankcase). They are reliably protected from the ingress of foreign objects and work on the principle of a single ensemble.

Depending on the type, the gearbox can be planetary and classical. Since the second is practically not used anymore, we will consider the design of the planetary mechanism, as well as the principle of its operation.

The gearbox design includes the following components:

Ring gear, which is located in the center of the mechanism.
Driven gear (carrier). It reliably fixes the axles of several planetary gears “satellites” located relative to each other. They have the same diameter and engage with the teeth on the inner surface of the “cogwheel”. Construction parts can be plastic or metal.

Gearbox for screwdriver with two-stroke motor

Depending on the number of gears, the reducer can be single-stage or multi-stage. The most common are the mechanisms consisting of two gears (two-stage). Their principle of operation consists in the rotation of satellites, which are driven by the circular motion of the ring gear of the engine. The use of such a mechanism allows you to make the speed of the carrier an order of magnitude lower than the speed of the motor.

The sequence of actions is as follows: the rotational movements of the first carrier go to the second, which in turn is connected to the chuck shaft. The transmission takes place through the central gear. The trinity of stellites of the second block works on the same principle as the first, as a result. the second carrier gets even lower revs. This action is typical for a two-stage gearbox. In the case of the three-stage, another planetary gear is added.

Disconnect the gearbox from the electric motor using the method described above.
Remove the plate and start taking out all the parts in order.
Unscrew the screws connecting the two halves of the gearbox.
If necessary, use pliers to adjust the spring diameter downwards, this will improve the engagement of the first gear.
Clean and lubricate the main components.
Assemble the entire mechanism, performing all the steps in reverse order.

It is worth noting that the reducer. this is a mechanism that is practically impossible to repair. The components of this mechanism are not produced by manufacturers. If the wires can be soldered, and the button replaced, then in the case of teeth and gears, only one way will be correct. complete replacement of this node.

How to remove a chuck from a screwdriver

A keyless chuck is used in the screwdriver, which is the most loaded, and therefore the most wearing part of the entire mechanism. It can be fixed by the following method:

Morse taper. the chuck has the same tapered bore as the shank.
2. Threaded method. the chuck is screwed onto the threaded end of the shaft.
3. Screw method. the chuck is secured with a fixing screw.

To determine which connection method is used in your tool, you need to inspect it and pay attention to the digital markings on the side of it. If you see the inscription 1-6 B10, then the Morse taper is used in the design of the cartridge. The numbers indicated show that the maximum and minimum diameter of the drill shank that can be clamped into the chuck is 1.6 mm. B 10.Morse taper size.

The threaded connection can be metric and inch. In the first case, it will look like. 1.0-11 M12x1.25. In the second. 2-13 mm ½-20 UNF.

Marking on the screwdriver chuck

Removing the cartridge

Threaded connection :

Unscrew the screw fixing using the L-shaped hex key.
Place the key with its short edge into the chuck and clamp it tightly in the jaws of a vise.
Put the device in drilling mode and turn it on at low speed. The free edge of the key should hit a table or other hard object.
Unscrew the chuck by turning the key.

Threaded connection with fixing screw:

Open the inner jaws of the chuck.
Unscrew the left-hand screw connection clockwise with a screwdriver.
Take the hex L key and clamp it tightly in the chuck with the short edge.
Try to turn it sharply counterclockwise.
If the chuck does not come off, hit the edge of the wrench with a hammer. It should loosen and come off the thread easily.

Morse taper

To remove the chuck fixed by the conical method, a couple of careful blows with a hammer on the body are enough.

How to properly charge the battery

There are 3 main types of batteries used for screwdrivers: Li-Ion (lithium-ion), Ni-Cd (nickel-cadmium) and Ni-MH (nickel-metal hydride). Each of the options requires a different and precise adherence to the correct mode of operation.

Li-Ion. the most common battery. Its main advantages are small size, weight, fast charging and no memory effect. The downside is the fear of low temperatures. As for the price, compared to other types of batteries, it is an order of magnitude higher.

To start using the battery, it is enough to completely discharge it once and charge it to 100%. Then you can safely operate it without thinking about the amount of charge. The only caveat. charged storage. This is necessary so that the internal parts do not dry out (optimal mode. 60% charge).

Ni-Cd is also one of the most common types of batteries, with a large capacity and small size. The price is much cheaper in relation to other types of batteries. The main disadvantage. the presence of a memory effect. Before using such a power source, it is necessary to complete 3 complete discharge / charge cycles. Failure to do so could result in a significant drop in battery capacity.

Ni-MH is a less popular battery, the undoubted advantage of which is absolute environmental friendliness and lack of memorization. The only imperfection. high self-discharge current. That is, when it is idle for a long time, it is completely discharged, and each subsequent charge increases the self-discharge current. If you forget to charge such a battery, it will fail over time. Before starting to use, the battery, like a lithium-ion one, must be immediately discharged and put on charge up to 100%.

And in conclusion

Based on this article, you can independently disassemble the screwdriver for the purpose of minor repairs, cleaning and lubricating the internal components. This should be done only if during the operation of the equipment you notice any interference, for example, speed modes do not switch or this happens with a certain delay. It is not recommended to use gears or couplings from other tools. Outwardly, they may look suitable, but in fact they do not correspond to the components of this model.

In order for the equipment to serve you as long as possible, and it does not have to be disassembled often, follow these simple rules:

  • Do not operate the device at high speeds for a long time.
  • Check how charged your battery is before use.
  • The fit size of the nozzle must match the fit size of the tool.
  • After changing the bit, make sure that the chuck is correctly locked.

Cordless drill-driver SPETS

What to do if the cartridge cannot be disassembled

  • Insert a bolt with a diameter of about one centimeter into a hammer drill or drill capable of operating in percussion mode. Broken drill can be used.
  • Insert a bolt or drill from the back.
  • We spread the cams.
  • Now you need to find an emphasis. it can be a table or a floor. It is necessary to put a shock absorber. a piece of rubber or foam.
  • The hammer drill with a sleeve rests against the shock absorber and turns on for a few seconds.

After repair or maintenance work, the assembled model will be easy to reassemble. It is important not to mix up the position of the cams. With prolonged use, they rub against each other and deform a little.

If the design does not imply outside interference, the body will have to be sawed, and then connected with a homemade girth. This process is quite time consuming and it is easier to install a new part.

How to unscrew a chuck on a screwdriver

This should be done not only in critical situations when urgent repairs are required. Parts need constant lubrication and cleaning, even if they have not been used for a long time. Without preventive maintenance, the tool will quickly fail. It is better to work on it with breaks of several minutes. The bit and the motor must be protected from overheating.

Cordless drill-driver BOSCH

How to remove and disassemble a screwdriver chuck

To understand how to remove a chuck from a screwdriver, you need to have a good idea of ​​how the tool works. This part is attached to the shaft that drives it and serves to fix the working body. As a rule, its shell is cylindrical in shape. Below it are the pressure cams and adjusting sleeves. When they get jammed, it becomes difficult or impossible to get the work piece. Then it becomes necessary to remove the clamp in order to further facilitate the repair work for yourself. This should be done for lubrication, cleaning and routine inspection. There are several mounting methods. Each of them has its own advantages and disadvantages. In each case, the problem is solved differently.

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Construction details

  • Sleeve
  • Base
  • Washer
  • Bearing
  • Nut.

The device can be more complex, but in most cases it consists of these elements.

Before disassembling the screwdriver chuck, you should look for other solutions to the problem. Trying to spin it up is useless. The fact is that most models are not designed for this, and it will not be possible to get inside without damage. If they understand, then there are several ways to act.

Methods for attaching the chuck to the shaft

There are two main ways.

  • On the thread. the sleeve is screwed onto the shaft.
  • With the help of the Morse taper. the taper shank is inserted into the hole on the spindle corresponding to its size. This method is one of the most effective and has been used for over a hundred years.

The fixing screw gives additional strength to the connection.

Threaded connection

For work, you need an L-shaped ten-millimeter hexagon. It is inserted into the cams, clamped tightly and rotated. It is more convenient to fix the hexagon in your hand or on a support and turn on the engine at low speeds. It should only work for a fraction of a second. This is usually enough to loosen the connection and remove the sleeve without hindrance. If the method does not work, the tool should be disassembled to approach the joint from the other side.

How to remove a chuck from a screwdriver

The parts of the screwdriver can wear out. the chuck is often unsuitable for further operation. Before replacing a part, you need to know how to remove it.

Initially in Russia, the use of a screwdriver was intended for the space sector, and only later. for construction and repair work. Its mechanism, called a chuck, consists of a hollow cylinder, an adjustable sleeve and pressure cams. So, there are several types of this element:

  • Quick-clamping. They, in turn, are subdivided into one- and two-clutch. The first type can be tightened or unscrewed with one hand, since the mechanism of these models is based on automatic blocking of the shaft when removing the equipment. The second involves working with two hands, since one clutch is held, and the other is scrolled when removing the rig. They can be made of both metal and plastic.
  • Cam. They are more reliable and durable, withstand a huge shock load, which is one of the most important characteristics. This type firmly fixes the tool, the shank diameter of which ranges from 0.1-0.25 cm.The most common in screwdrivers for household use.

The main difference is that in the first case, the attachments are attached by hand, and in the second. key. Of course, manual clamps are a great time-saver since you don’t have to find the right wrench. The main function of the chuck is to ensure strong contact between the working bit and the rest of the mechanical elements of the tool.

Mounting methods

There are several methods for fixing the chuck:

  • Thread. The shaft and chuck are threaded and then screwed together.
  • Morse taper. The shaft is sharpened to the dimensions of the cone in the chuck. The result is a strong connection.
  • Locking screw. It is an additional mount, the head is presented in the form of a Phillips screwdriver, and the thread is directed to the left.

In order to determine the type of fastener, just examine it carefully. The inscription 1-6 B10 says that this is a Morse taper, 1.0-11 M12x1.25. thread. The clamping device is necessary in order to ensure drilling with maximum accuracy. But after a while they wear out, the working area of ​​the drill begins to loosen during rotation. Therefore, when working with such a screwdriver, you will not get the expected result, since the place that should have been drilled will not be there. Therefore, the cartridge must be changed.

How to remove a chuck from a screwdriver

After you have determined the type of attachment, you can start removing it. There is nothing complicated in this and no special tools are needed, ordinary sets of wrenches, screwdrivers, a hammer and a locksmith vice will do.

When threaded, you need an L-shaped hexagon, you need to insert it with a short edge into the chuck, and squeeze the cams tightly. Next, you need to quickly turn on and off the screwdriver at low speeds, so that the free edge just hits a heavy object or table. Then just unscrew the cartridge.

In the event that the fixing screw is involved, you need to unscrew the screw clockwise, insert the hexagon and, with a sharp movement of your hand or hammer, scroll the free edge in the opposite direction. Now we remove the cartridge.

When attaching the Morse cone, you can remove the chuck with a hammer, since the shank can be released from the socket of the cone.

There is also a universal method: disassemble the tool and take out the structure of the spindle with the chuck and the gearbox, install it in a vice. Then use the key to release the desired part. Be careful, as you cannot overheat the screwdriver, let it rest from time to time. Also, when changing the cartridge, be sure to use safety glasses.

In continuation of the topic of inexpensive drills, we will undertake to study the product of the Czech brand Zitrek. This budget compact tool is attractive, first of all, for its low price. It’s even surprising: is it really possible to buy something that works for a thousand rubles??

Review of the cordless drill-driver Zitrek Green 12


The drill / driver comes in a modestly decorated box with a minimum of information about the tool printed on it.

The drill comes with a battery (alas, only one), a charger, a quick start guide and a free bit.

A screwdriver for a thousand, and even a bit? Eh, it’s a pity that there is no second battery. Let the price of the set increase by two or three hundred, but without a second battery, it’s not work. So, entertainment. However, let’s not get ahead of ourselves.

The most unscientific test

The reasons why this test is unscientific need hardly be explained. No one, not a single manufacturer, even the most impudent one with a diploma of a higher school of sales, will ever indicate such data as operating time and even more the number of screws screwed in among the characteristics of a screwdriver.

Fortunately, we do not manufacture screwdrivers. We study them and, if possible, compare them using our own criteria. One of these criteria is efficiency, which is expressed in the number of screws screwed into the tree.

As before, the tests used Scots pine with a moisture content of about 20% and oxidized wood screws 50 × 3.5 mm with a Phillips head. Before testing, the battery of the screwdriver is charged to the very contacts, and Fedor from the film about Shurik’s testing is now closely watching the progress.

Our modest fellow shows extraordinary vitality! Such that even the test screws ran out. I had to add others. They are shorter, but this is not important, since the battery charge remained slightly. The result. 222 self-tapping screws. is not only a beautiful figure. She is also very impressive. Especially (back to one of the main features of the tool) given the incredibly low price of the screwdriver. Fedya is satisfied.

An important question: what happens when the battery runs out? Here’s what: the screwdriver instantly, without any warning, stops working. Even the LED won’t turn on. And by the way, this moment is recorded in the video.


The power adapter supplied with the screwdriver supplies 12.6 V at 1000 mA. Not bad at first glance. With this current, the battery should charge fairly quickly. Well, in theory. Considering that there is only one battery in the kit, it should be charged not quickly, but very quickly. Otherwise, the functions of a “husband for an hour” risk being left unfulfilled.

Here is a short video that captures the process of charging the battery of the screwdriver in question.

Alas. It takes a record long time for the battery to fully charge. Almost two and a half hours! Perhaps it was worth equipping the tool with a more serious adapter?


The main characteristics of the screwdriver are presented in the following table:

At first sight

The drill body is made of rough plastic. The two casting halves are tightly fastened with hex bolts, no creaks or backlashes are observed. Note the absence of anti-slip inserts, which can lead to the tool slipping out of a damp or sweaty hand if work is carried out without gloves.

The standard design and light weight make this screwdriver suitable for any hand: men, women and even children.

A pale green color, midway between aquamarine and Persian green, will prevent the drill from getting lost among other tools or building materials.

How to remove and change the cartridge

For the sake of safety of the work carried out, keeping the mechanical and electrical parts of the device in good working order, the cartridge should be repaired or replaced. To do this, you will have to perform a small dismantling operation:

  • It is necessary to spread the cams to the side, unscrewing the outer rotating part of the chuck until it stops.
  • Then use a Phillips screwdriver to unscrew the screw (clockwise) that secures the head to the spindle.
  • The next stage is more convenient to carry out armed with an auxiliary tool. A gas wrench of a suitable size can be used. The appliance must be placed on the table. The chuck is rigidly fixed in the jaws of the key, and the lever is rotated counterclockwise with a sharp movement.
  • Now it remains to install the replacement, not forgetting to fix it with a screw on the spindle.

Why the screwdriver does not grip the bit and what to do

When using a hand drill, some people are faced with the problem of removing the bit from the chuck. During intensive work, the cams can be pressed against the replacement part with great effort and even jammed, so it can be difficult to turn the chuck even with a special key. The inverse problem, when the screwdriver does not grip the bit, occurs less frequently and is characteristic of a faulty fastening. What to do if the bit is not fixed properly will be discussed in the article.

Causes and types of malfunction

Incorrect operation of the fastening mechanism, when the screwdriver does not grip the bit poorly, may cause wear of one or more of its elements. On the outside of the cams there are teeth that engage with the rotary gear and, when screwed, move upward along a tapered guide, clamping the drill shank. When grinding the teeth on the cams or on the gear, the downforce is insufficient to hold the bit securely.

There is an option when the cams, although they do not converge completely, but up to a certain diameter can provide the required amount of pressure. Then a temporary solution is possible. Wire is wound on the shank of the bit (the best material is copper), increasing the diameter and thus tightly tightening the improvised structure. These are extreme measures that allow you to realize the capabilities of the tool only if absolutely necessary.

Can it be repaired

The possibility of restoring a failed unit depends on the specific design. In some models, repairs are provided by the manufacturer. Others are conditionally maintainable, that is, they can be carefully disassembled and assembled, but the question is whether there is a spare part that has failed. There are also monolithic cartridges that are poorly or not at all amenable to recovery.

As you can see from the information given, most often the screwdriver chuck does not grip the bit due to wear of the fasteners. The most realistic option is to swap out the entire broken node. The possibility of repair depends on the specific modification of the electrical appliance.

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How long does it take to charge the batteries of the screwdriver?

As a rule, the charging time of the screwdriver battery is indicated in the instructions for the tool. These recommendations should be carefully followed. Often the charger has a special display system to help you understand how the charging process is going. Thanks to this, you can easily determine with how much to charge the battery of the screwdriver. When charging is complete, you need to interrupt it in time so as not to damage the batteries. On average, the charger battery for a screwdriver can recharge from about half an hour to 7 hours. Practice shows that a Ni-Cd battery with a capacity of 1.2 Ah is charged with a current of 250 mA for about seven hours. Charging current is maintained using the mains adapter.

It should be borne in mind that there are two types of battery chargers. conventional and impulse. A standard conventional charger is more often used in a non-professional tool, it charges the battery in about 3-7 hours. Pulse. more suitable for professional mechanisms. Thanks to it, the battery performance can be restored in a maximum of an hour.

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Do I need to charge the batteries before storing?

If the cordless tool is not used for a long time, experts advise you to carefully consider the battery cells.

It is recommended to discharge nickel-cadmium batteries before storage, but not to zero, but to the point where the tool stops working at full capacity. In case of long-term storage, to restore the battery capacity, it is necessary to carry out 3-5 complete cycles of its discharge and charge. During the operation of the tool, it is also advisable to ensure that the battery is not partially discharged before charging, but completely.

Nickel-metal hydride batteries have a higher self-discharge rate than previous cells. They are recommended to be kept charged, and after a long “rest” to charge for about a day. Partial discharge is preferable for this type of battery. Their capacity decreases after 2-3 hundred charge-discharge cycles.

Lithium-ion batteries, which have no memory effect, can be charged at any time, whatever the degree of discharge. These batteries have the lowest self-discharge rate at the highest capacity. It is not recommended to fully discharge them, as this may disable the protective circuit. Power tools with such batteries are equipped with control electronics that disconnect the cell from the load when the temperature or voltage rises. It is recommended that these batteries be kept 50 percent charged. The number of charge-discharge cycles does not affect the capacitive characteristics of the cells, however, their life is limited by time and is about two years.

Battery charging features

How to properly charge a screwdriver battery so that it lasts as long as possible?

Batteries need to be charged before first use as they discharge during storage. In order for the battery capacity of the screwdriver to become the maximum possible for the nickel-cadmium cell, it is recommended to charge it three times and then discharge it. Thus, since the new battery has incomplete capacity, it must be brought up to full working capacity. After that, the batteries will need to be charged as soon as their capacity becomes minimum. Lithium-ion batteries are easier to use. They do not have a memory effect, so you can not bring them to full discharge and charge when it is convenient.

When charging, you need to take into account the optimal temperature regime of the process. It is better that the ambient temperature is above ten degrees and does not exceed forty. Batteries sometimes get warm during charging, but this should not be the case, as overheating adversely affects their performance, and they need to be cooled. It is undesirable to leave batteries in the charger. Yes, and it is better to store them by disconnecting them from the screwdriver, separately from the tool itself. If the batteries are not used for a long time, they should be recharged once a month.

It is better to buy rechargeable batteries at specialized points of sale. Correct use will help increase their service life. During operation, it is undesirable to discharge the elements completely until the engine stops. They will need to be charged as indicated by their markedly reduced performance.

Types of batteries used to operate the screwdriver

Before purchasing new batteries for the screwdriver, you must carefully study the instructions for the device. The tools required for work can be professional, household and semi-professional. Batteries for them differ from each other in capacity, quality and price.

For certain jobs, certain types of cordless tools are also intended, designed for different loads, therefore, different batteries are needed for them. The higher the power rating of the battery, the longer it can work. For convenience, it is better to have two batteries so that you can recharge the second when working with one. Often a second battery is already included when the instrument is sold.

Various types of batteries can be used for screwdrivers. The most commonly used nickel-cadmium (Ni-Cd) and nickel-metal hydride (Ni-MH), and more recently also lithium-ion (Li-Ion).

The most common of these are nickel-cadmium batteries, which are compact in size, large in capacity and at an affordable price. These batteries can be effectively charged more than a thousand times, depending on their design, purity of materials, operating mode, including correct charging. However, these devices have a so-called memory effect, and if you charge them without waiting for a full discharge, the battery capacity will gradually decrease. In addition, the production of such elements is so toxic that the European Union abandoned it on its territory.

In second place in terms of frequency of use. nickel-metal hydride batteries, representing a new generation of similar devices. From an environmental point of view, both the production and disposal of these batteries are practically safe. The advantages of batteries of this type include the fact that they have less pronounced memory effect, and the disadvantages. high self-discharge current. These batteries must be kept charged and fully recharged when not in use for more than a month.

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recently, more powerful lithium-ion batteries have been used for cordless tools. They also do not have such a disadvantage as the memory effect, which requires periodic discharge cycles to restore capacity. However, these batteries do not tolerate low temperatures well, and it is undesirable to work with them in cold weather. Despite their fast charge and high capacity, they are not very popular yet, as their price is quite high.


Among power tools, both household and professional, the screwdriver is one of the most demanded. With its help, you can not only twist and screw in self-tapping screws, but also drill holes. Mains-powered tools cannot be used always and everywhere, and the cord interferes with work all the time. Cordless screwdrivers are relieved of these disadvantages. With them, you can move freely and not depend on the presence of an outlet in the room.

An important element of every cordless tool is the battery, which allows you to work with it autonomously. This is very convenient, but sooner or later, each owner of such a power tool faces the question of how to charge the battery of a screwdriver.

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  • Types of batteries used to operate the screwdriver
  • Battery charging features
  • How long does it take to charge the batteries of the screwdriver?
  • Do I need to charge the batteries before storing?
  • What to do if the screwdriver battery does not charge?

What to do if the screwdriver battery does not charge?

If the battery of the screwdriver does not charge, perhaps the reason is to look for its deterioration or in the malfunctioning of the charger. However, often the problem lies in the disruption of contact between the battery terminals of the screwdriver and the charger, as they unbend over time. In this case, you can disassemble the charger and bend its terminals.

In addition, after some time of use, both the battery contacts and the charger contacts may oxidize and become dirty. Even minor changes of this kind can prevent the batteries from charging properly. This usually translates into a significant reduction in both the charging time and the operating time of the cordless power tool itself. To prevent this from happening, you need to periodically wipe the contacts of the battery, the charger for the battery of the screwdriver and the tool.

Unfortunately, battery cell performance degrades over time. So, with improper use of nickel-cadmium batteries, most often used in household screwdriver models, they quickly lose capacity. Experts sometimes advise to “overclock” such batteries. The battery pack is disassembled and problematic items are identified. After that, they need to be charged. What current to charge the screwdriver battery in this case? Experts recommend that you first charge such elements with a higher current than it should be, then discharge them and charge them again, but with a small current. If the electrolyte has not yet evaporated in Ni-Cd batteries, this “therapy” may help bring them back to life.

In addition, you can restore one battery pack from two that have partially lost their capacity by selecting from them and soldering together whole “banks”. After that, to equalize the charge, it is required to fully charge and discharge the recovered unit several times.

Also, the reason is that the battery does not charge, it may be in the temperature sensor.

What to do if the screwdriver scrolls

The screwdriver is a great helper for interior and exterior renovations. Often purchasing a domestic or imported screwdriver, we want to get a reliable and durable tool.

However, we do not think about it, but we often forget that the reliability and durability of equipment directly depends on the storage conditions and operating rules.

Long-term use and constant loads, sometimes sometimes exceeding those established by the manufacturer, almost always lead to temporary or complete failures in the operation of the equipment or device. In the case of a screwdriver, this may be the scrolling of the chuck.

You can face such a problem even if you just bought a screwdriver, but often such a breakdown occurs at a later stage of operation.

If this happened, do not panic, it is better to start looking for the manufacturer’s service centers, because not all breakdowns you can fix yourself.

If the screwdriver scrolls, then there are reasons for this. Let’s look at the most common causes of this phenomenon.

Signs of tool breakage

  • Sounds that are not characteristic of the instrument during operation, that is, during normal operation, the instrument emits sounds normal for it, and in the event of a breakdown, extraneous ones are added, for example, knocking or crackling, which did not exist before.
  • Vibration and / or chuck breakage. In this case, you may feel an unusual vibration of the tool or chuck striking during the tool.
  • The screwdriver constantly or intermittently jams during operation.
  • When the screwdriver is turned on, the motor starts to rotate the chuck using idle speed. In this case, the rotation can be easily stopped with the help of a hand, even if the device is operating at second speed.
  • Scrolling the screwdriver under load during operation. This can be a signal of a breakdown of the breakdown itself or a common cause of breakdown.

Such damage should be looked for in the gearbox, clutch or speed switch. Long trouble-free operation of the screwdriver under load can cause damage such as shaft distortion. Therefore, you should strictly follow the instructions from the manufacturer.

This breakdown leads to severe runout and vibration of the screwdriver. Well, the most common breakdown among screwdrivers is the wear of the bearing shaft support sleeve.

If, while working with a screwdriver, you hear a sudden crackle and notice scrolling in the switch position, then most likely this is a problem with the gearbox.

Causes of breakage of the screwdriver

  • Insufficient lubrication of the gearbox. In this case, disassembly and good lubrication of the latter will help you out.
  • Bending of the gearbox shaft. Here, replacing it will most likely help you, rather than straightening it. It is better to replace the part than to use the old one, otherwise you will end up with a new clutch anyway.
  • Damage or breakage of the satellite, or the pin to which the satellite itself is attached.
  • Worn bearings or the gearbox shaft itself.

When checking for faults, it is important to understand and see the very first signs of faults in the instrument.

How to troubleshoot

  • If one bushing or one bearing is damaged, you can simply replace the broken or damaged part.
  • We replace the carrier or the gearbox itself
  • You can replace the gears completely, or you can limit yourself to repairing them.

We repair the screwdriver in stages

  • We take out the engine and carefully disconnect the motor and gearbox.
  • We disassemble the gearbox itself. To assemble it in the same way as it was, you need to photograph it or sketch out the location of the gearbox.
  • If the teeth of the clutch are erased, then we replace it with a new one. It must be rigidly fixed.

We carry out repairs using a bench vise, drill and drill of the required size. You will also need wire cutters and a few screws.

The repair process will not take up a lot of your time and attention. If you do decide to fix the worn teeth of the old clutch rather than buy a new one, then you will need a drill and drill bit. To do this, it will be enough for you to drill several holes in those places where the teeth were and screw the required number of screws into these holes.

If parts of the screws protrude, then we shorten them with pliers and turn on the screwdriver to check the performance of the tool.

Below in the video you can visually see the repair process itself.