The history of the emergence of power tools. Corded screwdrivers: which one is better and how to choose Application depending on the characteristics

Bit holder clamped in the chuck with a Phillips screwdriver bit installed

To work with screws and screws, replaceable nozzles with various screwdriver tips are used - bits, which are a steel rod with a hexagonal shank of a uniform size on one side, and a working end inserted into the fastener slot on the other. The most common types of slots are cross-shaped Pozidriv and Phillips.

Bits can be installed either directly in the chuck (bits from 50 mm long are suitable for this), or in a bit holder (for bits with a standard length of 25 mm) or, if available, in a hexagonal recess in the screwdriver's spindle.

Battery

Options:

• Voltage (3.6-36 volts) - determines the power of the engine, the amount of torque that the screwdriver can create, as well as the duration of operation from one battery. The average battery voltage is 10.8-14.4 volts.
• Capacity (0.3-3.3 Ah [Ah]) - Affects the duration of a single battery. The average value of the capacity is 1.3-3 Ah.
• Type: lithium-ion ( modern type battery), nickel cadmium, nickel metal hydride. The voltage of lithium-ion batteries is a multiple of 3.6 volts, and nickel-cadmium and nickel-metal hydride - 1.2 volts, since the battery pack consists of separate, series-connected cells with the appropriate voltage.

The presence of a second battery in the kit allows you not to interrupt work while waiting for the charging of one battery: while one is being discharged, the other is being charged. positive property cordless tools is their mobility and independence from the presence of power supply, as well as the absence of the danger of injury electric shock, negative - limited operating time and the need for constant recharging.

Non-removable batteries, as a rule, are only for low-power screwdrivers - cordless screwdrivers. For the rest of the screwdrivers, the battery is removed from the tool for connection to the charger.

Torque

Max Torque

Determines how large a diameter and length a screw can be driven by a screwdriver, as well as the diameter of a drilled hole in wood, steel or concrete. It is measured in units of newton-meter (Nm). The average values ​​of the maximum torque are 10-60 Nm. The amount of torque (in fact, the power of a screwdriver) depends on the voltage of the battery used. For corded screwdrivers, the amount of torque is determined by the power consumption or output of the tool.

There are several types of maximum torque:

• Soft
• Hard
• Continuous - the torque that the tool develops during continuous rotation without stopping the spindle.

Maximum torque figures are based on a fully charged battery.

adjustable torque

Some screwdrivers, also with a quick change chuck, have a spindle with a socket at the end for bits or other bits with a hex shank.

Spindle lock

The spindle lock feature, if a rotational movement is applied from the side of the chuck, makes it convenient to change bits in the chuck, since the chuck only needs to be held with one hand. Depends on the design of the gearbox.

Reverse

Changing the direction of rotation of the spindle for unscrewing fasteners. The reverse in screwdrivers is usually electronic, that is, switching occurs by changing the electrical polarity. To control the reverse, there is a two-position switch next to the start button, which can additionally have the function of blocking it from being pressed when the switch is in the middle position.

shock mode

Impact rotation allows for more efficient drilling of holes in concrete, brick and other hard building materials.

Pulse mode

In this mode, torsion occurs in intermittent - measured jerks, which facilitates drilling holes on hard and smooth surfaces (the drill will not lead to the side), as well as unscrewing screws with a damaged slot. Pulse mode is found in screwdrivers, as a rule, in exceptional cases.

Backlight

Lighting working area built-in LED flashlight.

see also

Notes

Literature

• "As you charge, so you spin." Cordless drill test. // DEMAND : Journal. - October 2007. - No. 10. - S. 19-23.
• "Indefatigable Hand" Battery screwdriver test. // DEMAND : Journal. - January 2008. - No. 1. - S. 15-19.
• Screwdriver test. // DEMAND : Journal. - July-August 2010. - No. 7-8.
• Screwdriver… Just a screwdriver… // Consumer. Tools: Journal. - autumn-winter 2011. - No. 11. - P. 80
• Poletaev A."Heroes of our time". Test of cordless drills with a battery voltage of 14.4 volts. // Drill To Holes: Journal. - 2011. - No. 4. - S. 32-43.

Links

Wikimedia Foundation. 2010 .

Synonyms:

The electric drill, in one form or another, is used today in many areas: from conventional drilling to well drilling and medical surgical applications. Probably, most men now have such an indispensable tool as an electric drill. At least everyone at least thought about the question of acquiring it. However, few people know when the electric drill was invented?

The first drills began to be used during the ancient Egyptian and ancient Indian civilizations. The earliest ones consisted of 2 sticks and a long cord attached to them. To obtain such a design, the ancient craftsmen wrapped a bowstring around one stick and quickly rotated the other stick along the axis back and forth. Such a tool was used to make holes in non-solid materials or to make fire.

The invention of drills was caused by the need to solve the problem of facilitating labor during drilling. In the first half of the 19th century, underground work was carried out using manual labor blows of a heavy sledgehammer on a steel rod. Then Simon Ingersol was able to design an impact drill that knocked and rotated a large steel rod. Already in 1870, he improved the drill by equipping it with a steam drive. Such drilling rigs greatly facilitated the work, but progress was moving forward. After the invention of electric motors in the 70-80s. XIX century, engineering specialists began to think about expanding its practical application. In 1889, engineer Arthur James Arnot was able to combine a drill with an electric motor. Thus, he solved the main issue that faced the industry at that time: the lack of coal for all kinds of mechanized installations.

The potential of using the electric drill was highly appreciated. Now other inventors began to work hard to improve the electric drill. Six years after Arnot registered his patent for the invention of the electric drill in 1895, brothers Karl and Wilhelm from Stuttgart, Germany, patented a drill that could be operated and handled. The improvement of the first hand-held electric drill model by making certain of its components from lightweight aluminum made it possible to significantly reduce the weight of the product.

At the beginning of the 20th century, in 1917, the same Arthur Arnot, working in the young and promising company Black and Decker, received a new patent for the invention of a switch and a convenient pistol grip for an electric drill. The popularity of the new model of the device was so grandiose that it enabled the company to grow into a fairly large international concern. Already in 1929, she opened her new branch in Sydney, Australia. Already by 1946, when the brilliant inventor Arnot died, the company positioned itself as a major Australian manufacturer of industrial and household power tools.

With compressed gas (usually air).

Encyclopedic YouTube

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Subtitles

Hello friends! I recently had a video on how to convert an old sick screwdriver to lithium batteries. You really liked the video, but in the comments, many wrote that it would be desirable to write a screwdriver for the home from the outlet. This is what we're going to do today. Before converting your screwdriver to a network, you can look at ready-made network screwdrivers, for example, on the e-katalog website. Let's use a filter to limit unnecessary options, and look at mains-powered drills and screwdrivers. On the product page, you can immediately see the prices in several stores, which is very convenient. By the way, you can watch a video review of almost any product in this catalog, you can also add a product to compare with other selected ones, and immediately see the differences in characteristics. And there is absolutely any tool! Use the link to the e-catalog, it will be in the description under the video, let's start with what the actual problem is. A screwdriver is a fairly powerful device under load, even a weak screwdriver can consume up to 200 watts of power. 220 change is needed for a constant voltage, the power supplies go mainly to 12 or 24 volts, that is, it only makes sense to redo a 12-volt screwdriver, for example, I still have one more dead nickel battery for 12 volts and from the last video about altering my grandfather's screwdriver, here above it today and we will scoff by the way, if you didn’t watch that video, then definitely look, I told a lot of interesting things about batteries and gave a lot of advice on how to use them correctly to extend the service life if we go to our favorite aliexpress, we will see that 12 volt power supplies are on decent power, measured by the way in Chinese watts, is very, very not tasty and at a price it comes out a little bit cheaper than a good Chinese screwdriver, one asks, but what for in general to redo something, so aliexpress will not help us in solving this problem and therefore I want to offer you a few other once a more profitable option, power supplies from computers are quite powerful guys, you need to go to any computer repair, not for a couple of hundred rubles, buy a used power supply, let's say for 500 watts, let it be crumpled dirty covered in dust, but the main thing is that it works on the wall usually detailed information on the power lines is written here we can see 25 amperes per 12 volt line and this is no less than 300 watts of power for a screwdriver is enough with a margin such a power supply is of course quite large but at the same time it is much cheaper than even Chinese blocks for less power By the way, about the Chinese, I remind you that now there is a big sale in honor of the birthday of aliexpress and you have two whole days to stock up on all small things, the Chinese, as usual, raised all prices in a week, but now they have fallen very low on my website there are a bunch of thematic collections of goods for lovers of homemade electronics and robotics, that is, all kinds of electronic board modules, kits for assembling soldering training, soldering equipment itself and generally working with wires, electronic components, as well as a bunch of tools that I myself personally used and filmed a review on them, and by the way, batteries for converting a screwdriver are now also possible it’s very profitable to buy, but in general, like everything else, use the links to some collections for health and left in the description under this video, well, then I think you’ll figure it out. terminals so that we carefully disassemble everything and release the terminals from the batteries, I want to make the battery removable so that you can work from batteries and from the network, that is, you get such a universal harness with terminals and wires to this cream, you will need to solder a wire with a cross section, let's say three square millimeters of this should enough so that the energy does not dissipate into heat even over a wire length of about two meters, I don’t know how it will be in your screwdriver personally, I managed to bend the ears with glue directly into the plastic and it turned out very reliably now we remember that we will have a negative wire, let’s say blue and insert the terminals according to the plus and minus symbol on the battery case, supporting from below, for example, with a screwdriver, drill through with a 3 mm drill and remove the chamfer with a large drill, remove it so that the m3 screw with a countersunk head does not stick out, well, it remains to tighten it with a nut, I don’t know why I didn’t do this from the last the battery, if you remember, I made a spacer from bamboo skewers, of course, it is many times better, it is also highly desirable to put a 16 or 25 volt capacitor in parallel with the terminals and a capacity of about 10,000 micro farads. The capacitor will serve as an energy buffer for inrush currents, this is necessary in order to reduce the load on power supply otherwise it will go into protection, we take and solder

Description

To work with screws and screws, replaceable screwdriver-inserts (bits) with various tips are used, which are a steel rod with a hexagonal shank of a uniform size on one side, and a working part inserted into the slot of the fastener, on the other. The most common types of slots are cruciform Pozidriv and Phillips. In some types of industrial equipment, the shank of the bit driver has a thread instead of a hex, or a driven cam or other forms of torque transmitting element.

Screwdriver-inserts (bits) can be installed both directly in the clamping chuck (bits with a length of 50 mm or more are intended for this), and in a bit holder (for screwdriver-inserts of a standard length of 25 mm) or, if available, in a hexagonal recess in the screwdriver spindle.

A suitcase or bag, as a rule, included in the screwdriver set, allows you to conveniently store and transport the tool, charger and replaceable batteries to it.

Design

The screwdriver consists of several structural units:

• electric motor or pneumatic motor - produces rotational motion;
• planetary gearbox - forms a mechanical transmission from the engine to the spindle, on which the screwdriver chuck is installed;
• coupling-regulator of torque and / or screwing depth - adjacent to the planetary gearbox;
• electronic control unit with start button and reverse switch (reverse rotation);
• clamping chuck - necessary for connecting working nozzles (bits; wrench heads or drills) with a torque shaft (spindle);
• rechargeable battery (for cordless electric screwdrivers) - .

Depending on the design, the gearbox may have a switch for speed modes (gear ratio). The gearbox housing for screwdrivers can be made of metal alloys, or wood (very rarely). But in most cases, it is plastic - this reduces the cost of production and reduces the weight of the tool. Some gearbox gears can also be made of plastic. The metal gearbox housing withstands greater mechanical loads and has a better heat dissipation than plastic. Wooden cases are practically not used, due to the laboriousness of production, operation and repair.

Varieties

Screwdrivers are divided into different kinds, depending on the equipment and purpose.

screwdriver

Manual (with rare exceptions) tool with a cam chuck. Designed for drilling and working with fasteners. It has a torque control clutch. Can have 1, 2 or 3 rotation speeds. It can have an impact function (axial impact, like an impact drill). Does not have a tangential impact function. It can have an electric (mains, battery) or pneumatic drive. Screwdriver (travel instrument) has a wheel base and a landing cone for a drill instead of a chuck.

Depth-adjustable screwdriver

Commonly referred to as a drywall screwdriver. It has a coupling-regulator screwing depth. Single speed hand tool. It may have a torque control clutch (very rare). Not equipped with a chuck. Drills with a hex shank must be used for drilling. May have a self-tapping device. Can be electrically powered or battery operated.

Cordless screwdriver

Compact hand tool with low power and usually has a spindle lock, which allows it to be used for manual screwing or unscrewing. Has a 1/4" hex bit holder. Does not have a chuck. Drills with a hex shank must be used for drilling. May have a torque adjusting clutch. Does not have a screw depth adjusting clutch. Typically a single speed tool. Electric screwdrivers are available. operating both from galvanic cells (batteries) and batteries corresponding to them in shape (AA, AAA).

wrench

Specially designed tool for tightening and loosening bolts and nuts. Nutrunners are called as hand tools, and heavy equipment that has a wheelbase (Travel motor wrench) or placed only on a suspension. It has an impulse mode of operation (tangential impact function). Not equipped with a chuck. Instead of a chuck, the wrench has a short square shaft (with square dimensions in inches: 3/4", 1/2", 1") for installing wrench heads. The spindle seat has a spring locking element (usually a spring-loaded ball) or a transverse through hole for fixing the head with a separate ω-shaped spring retainer, cotter pin (pin) with ring or similar fastener Single speed tool Usually has neither a torque control sleeve nor a depth control sleeve External screws must be used to limit the torque devices - torsion bars Not used for drilling (with rare exceptions) It can have an electric (mains or battery), pneumatic, hydraulic or gasoline drive.

Screwdriver

A hand tool similar to a wrench, but with the difference that it has a 1/4" hexagonal holder and is used mainly for working with screws and self-tapping screws. There are combined models in which the spindle seat combines an outer 1/2" inch square and an internal hexagonal holder 1/4". For drilling, drills with a hex shank must be used. May have an electric (mains, battery) or pneumatic drive.

Main characteristics

Power supply

Depending on the type used, screwdrivers are divided into network And rechargeable.

Using an electrical outlet makes the tool cheaper and may be preferable in locations where an AC outlet is available, or where there is no restriction due to the length of the power cord from the tool to the electrical outlet.

An indicator of the power of a screwdriver powered by the mains is the power consumption or output power, measured in watts.

Electric battery allows you to use the tool in hard-to-reach places and also in places without power sources. In addition, battery-powered electric screwdrivers are safer.

Battery options:

• Voltage (3.6-36 volts) - determines the power of the engine, the amount of torque that the screwdriver can create, as well as the duration of operation from one battery. The average battery voltage is 10.8-18 volts.
• Capacity (1.3-6 Ah [Ah]) - Affects the duration of a single battery.
• Type: lithium ion (modern battery type), nickel cadmium, nickel metal hydride. The voltage of lithium-ion batteries is a multiple of 3.6 volts, and nickel-cadmium and nickel-metal hydride - 1.2 volts, since the battery pack consists of separate, series-connected cells with the appropriate voltage.

The presence of a second battery in the kit allows you not to interrupt work while waiting for the charging of one battery: while one is being discharged, the other is being charged. A positive feature of cordless tools is their mobility and independence from the presence of power supply, as well as the absence of the danger of electric shock, the negative is the limitation of operating time and the need for constant recharging.

Non-removable batteries, as a rule, are only for low-power electric screwdrivers and cordless screwdrivers. For the rest of the electric screwdrivers, the battery is removed from the tool for connection to the charger. In 2015, Bosch introduced the inductive battery charging system (), eliminating the need to remove the battery from the tool to connect to charger(in this case, batteries with an induction coil can be removed from the tool and charged on a conventional charger).

Torque

Max Torque determines how large a diameter and length a screw can be driven by a screwdriver, as well as the diameter of a drilled hole in wood, steel or concrete. Measured in units of newton meter (Nm). The average values ​​of the maximum torque are 10-60 Nm. In some unstressed models, it reaches 100 Nm.

The product of the spindle speed and the torque provided by the screwdriver at that speed determines the power of the tool, which is proportional to the voltage of the battery used. To increase the torque, low voltage models use gears with a higher gear ratio, while the rotation speed is reduced. For corded screwdrivers, the amount of torque is proportional to the power input or output of the tool.

There are several types of maximum torque:

• soft,
• hard,
• continuous - the torque that the tool develops during continuous rotation without stopping the spindle.

The numerical values ​​for the maximum torque are based on a fully charged battery.

adjustable torque

The coupling-torque regulator allows you to tighten screws and screws with the required force, thereby avoiding thread stripping, grinding of the slot, and wear of interchangeable heads. As a rule, there are 6-24 positions of the regulator clutch on digital values ​​with varying degrees of effort when twisting or unscrewing (digital designations are usually arbitrary and do not match the torque that corresponds to them). For drilling, there is an extreme position of the coupling, which provides the maximum value of the torque without limitation.

control impulses. The power part of the regulator consists of a fast (about 1 kHz) electronic switch, and the inductance of the motor winding as an integral part of the circuit.

Number of spindle speed modes

• one - at a speed of approximately 0-800 rpm idling.
• two - switching from about 0-400 rpm to 0-1300 rpm. The first mode is mainly used for screwing and unscrewing, the second mode is for drilling.
• three (rare).

Chuck

According to the method of fixing nozzles:

• Quick-clamping three-jaw - allows you to clamp the drill or bit holder without the use of a clamping key.
• Three-jaw key - to secure the part in such a chuck, a toothed clamping key is required.
• Quick-change holder - usually for 1/4" hex, allows you to quickly change the bit to another.

By the number of couplings:

• Single-clutch - used with the function of blocking the spindle from scrolling during the change of nozzles.
• Double-sleeve - used with screwdrivers that do not have a spindle lock function. One clutch serves to hold the cartridge, the other to clamp.

The average maximum clamping diameter of quick-clamping and key chucks is 10-13 mm.

Some screwdrivers, also with a quick change chuck, have a spindle with a socket at the end for bits or other bits with a hex shank.

Forced spindle braking

It is used to reduce the spindle overrun after the trigger button is released, so that the spindle stops as close as possible to the moment the button is pressed. This makes it possible to exclude excessive rotation of the part to be screwed, increasing the accuracy of its installation. The braking function is useful when a screw, screw or nut is not fully tightened.

The load turns into thermal and dissipates.

Spindle lock

The spindle lock feature, if a rotational movement is applied from the side of the chuck, makes it convenient to change bits in the chuck, since the chuck only needs to be held with one hand. Depends on the design of the gearbox.

Reverse

Changing the direction of rotation of the spindle for unscrewing fasteners. The reverse in screwdrivers is usually electric, that is, switching occurs by changing the polarity of the voltage supplying the motor. To control the reverse, there is a two-position switch, which can additionally have the function of blocking it from being pressed when the switch is in the middle position.

shock mode

Rotation with axial impact (like an impact drill) allows you to drill holes more efficiently in concrete, brick and other hard building materials.

Pulse mode

In this mode, torsion occurs in intermittent - measured jerks (tangential impacts), which facilitates drilling holes on hard and smooth surfaces (the drill will not lead to the side), as well as unscrewing screws with a damaged slot. The pulse mode is not found in the actual screwdrivers. A tool specially designed to create a tangential impact is a wrench (screwdriver).

I twist, I twist, I want to fix. How to choose a screwdriver

Electricity has become a part of our life everywhere. It heats and illuminates our dwellings, cooks, fries, soars, helps in construction and repair, the work of many devices and devices that facilitate human existence depends on it. To paraphrase a well-known expression, we can say that today "without electricity, neither here nor there."

In our life, situations often arise when we have to work at a great distance from mains power sources, when no extension cord is able to solve the problem of delivering electrical energy. Then cordless tools come to the rescue, in the list of which one of the most common is a screwdriver. These devices more and more confidently take the leading positions in the catalogs of manufacturers. building tools. The reason is clear: the interest of buyers in these compact and mobile tools is growing at a gigantic pace. Today, the choice of these tools on the market is quite large and the only problem is which screwdriver to choose.

Using Newest technologies and rich experience manufacturers, release all new models. At the same time, designers developing screwdrivers are guided by the following principles: increasing productivity, reducing weight and dimensions, improving ergonomic characteristics. We decided to talk about the features of some machines, how to choose a screwdriver, what to look for in the first place.

From the history of the screwdriver

The history of the emergence of electric screwdrivers is inextricably linked with the invention of electric motors, which are based on the principle of electromagnetic induction, discovered by the English physicist Michael Faraday in 1831. One of the first electric motors was created in 1834 by the Russian electrical engineer Boris Yakobi, whose goal was to convert electrical energy into mechanical energy.

The first electric motors were far from perfect, and the batteries that powered them were large and small. Nevertheless, already in 1838, Jacobi, having installed an electric motor of his own manufacture on a rowboat, and having made a short trip along the Neva together with ten companions, showed the whole world one of the possibilities of his invention.

Today, electric motors have found application in almost all areas of human activity, both in everyday life and in industry.

Similarities and differences

It is unlikely that anyone will argue that a screwdriver is a necessary tool, and there will always be work for him on the farm. Initially, these devices were only capable of twisting and unscrewing, but in the process of evolution they acquired a drilling function and now they can twist and unscrew a dozen or two self-tapping screws, and, if necessary, drill a hole in wood or metal - as they say, they are happy to try.

Often, ordinary people do not see the difference between a cordless screwdriver and a screwdriver. And there is a difference between the two. Screwdrivers are designed for twisting and unscrewing, their spindle allows you to install only hexagonal bits, with a Phillips or flat head, it is impossible to use full-fledged drills in them. Although on sale you can find special drills, designed for cordless screwdrivers, but, you see, this is not the same. In addition, screwdrivers, as a rule, do not have good motor power and it is impossible to use small diameter drills in screwdrivers.

Drills are closest to screwdrivers, but they do not have a reverse that allows you to unscrew bolts, screws, self-tapping screws. Therefore, the most economic part of the population prefers screwdrivers, although many of them, before choosing a screwdriver, do not hurt to learn about some of the characteristics and adjustments of these wonderful tools.

What to look for when choosing

So, according to the type of power, screwdrivers can be networked or wireless. The main characteristic of any power tool is the power, which in a corded screwdriver is determined by the parameters of the motor installed in it. In the case of wireless models, it is necessary to pay attention to the characteristics of the entire complex. In this case, the power of the tool largely depends on an autonomous power source, in other words, a battery. Here you need to pay attention to the "voltage" of the battery, the higher it is, the more hard work the tool can do. The battery voltage, which is measured in volts (V), depends on the number of batteries in the pack. To perform simple household tasks, a screwdriver with a 12 or 14.4V power supply is enough. For more serious tasks or professional activities, you will already need a heavier and more powerful 36-volt model.

Undoubtedly, it would not be entirely correct to evaluate the power of certain screwdrivers based only on the “voltage” of the battery. In order to evaluate a screwdriver better, you also need to know the capacity of the battery, which is measured in ampere hours (Ah). It is the battery capacity that determines the operating time of the device on a single charge. Screwdrivers designed for household needs usually equipped with a battery with a capacity of 1.2-1.5 Ah. Batteries with a higher capacity are installed on professional devices. In order to evaluate the power of a screwdriver, both characteristics must be taken into account.

The use of a screwdriver largely depends on the speed of rotation. High speed allows you to drill various holes with small and medium diameters, lower speeds are necessary for fastening work. Therefore, most modern screwdrivers are equipped with a two-speed gearbox, which greatly simplifies the work. In addition, the two-speed mode significantly saves the stock of electrical energy stored in the batteries. There are models equipped with a three-speed gearbox, but this group of screwdrivers is very small and very expensive. It includes BHP 451RFE (manufactured by MAKITA), DCD 925 B2 (manufactured by DeWALT), etc.

Another important characteristic of a screwdriver is torque, that is, the rotational force that the tool is capable of creating. It is measured in Newtonmeters (Nm). When choosing a screwdriver are guided simple rule: the lower the maximum speed during operation, the higher its torque. Each model on the market has an individual torque. For example, the BDF 454 RFE (MAKITA) has a torque of 80 Nm, which allows it to work with large fasteners and drill various holes, but the DS10DFL model from HITACHI may not be able to cope with large self-tapping screws, especially if they are screwed into hardwood or metal, because The torque of this screwdriver is only 22 Nm. Therefore, in order to find out specific figures, the buyer needs to look into the technical data sheet of the tool he likes.

The design of any screwdriver includes a torque adjustment clutch, which is necessary for dosing the force of the device. Without it, during operation, you can easily break the nozzles, “lick off” the heads of the screws, etc. Modern screwdrivers have up to twenty torque settings, which are selected depending on the class of work. If the coupling setting is chosen correctly, the screw head will not sink, and the slots will remain intact. When choosing a screwdriver, it is advisable to try out the work, as they say, without leaving the cash register. To do this, in a store or on the market, taking the device in your hands, you need to set the minimum value on the coupling, after that, turning on the screwdriver, try to hold the chuck-spindle with your hand. If there is not enough strength, you should look for another model.

By the way, the screwdriver comes standard with a two- or one-sleeve chuck. More convenient, of course, is a single-sleeve, since in a two-sleeve, in order to fix a bit or a drill, it is necessary to act with two hands, holding the lower ring with one hand, tighten the top ring with the other. The single-sleeve chuck greatly facilitates this operation. Screwdrivers with this device are equipped with a spindle lock. While the motor is running, it rotates with it, but as soon as the motor freezes, a lock is triggered, the spindle cannot be moved, even with considerable effort. It remains only to insert a drill or bit into the chuck and tighten it.

Often in the process of work, situations arise when a screwdriver is not able to reach the “target” due to various obstacles: corners, narrow openings, etc. For this purpose, manufacturers offer angled nozzles that allow you not only to twist and unscrew screws, but even drill holes.

In conclusion, a few words about the power of the screwdriver. One of the most "tenacious", despite the emergence of new models, is considered the good old nickel-cadmium battery. It has a lot of advantages: it is inexpensive, not afraid of long-term storage, can work both in low and high temperatures etc., but (very IMPORTANT) in order for it to serve for a long time, the energy in it must be developed to the end. Only then can it be charged. Otherwise, the battery capacity will decrease and in the near future it can be thrown away. In addition, it should be borne in mind that this type of battery contains materials that are highly toxic, so recycling them is also not an easy task.