The history of the appearance of the power tool. Network screwdrivers: what better and how to choose use depending on the characteristics

Bit holder, squeezed in the cartridge, with an installed knotting nozzle

To work with screws and screws, replaceable nozzles with different tips are used - bits, which are a rod of steel with a hex shank standardized by size on one side, and the working end inserted into the fastener slot on the other. The most common types of slots are cruciform Pozidriv and Phillips.

Bits can be installed as directly into the clamping cartridge (for this, bits with a length of 50 mm) and to the bit holder (for the standard length of 25 mm) or, if there is a screwdriver in the hexagonal spindle.

Battery

Parameters:

• The voltage (3.6-36 volts) - determines the power of the engine, the torque value that the screwdriver can create, as well as the duration of operation from one battery. The average battery voltage values \u200b\u200bare 10.8-14.4 volts.
• Capacity (0.3-3.3 amp-hour [A · H]) - affects the duration of work from one battery. The average tank value is 1.3-3 A · h.
• Type: Lithium Ion ( modern type Battery), nickel-cadmium, nickel-metal-hydride. The voltage of lithium-ion batteries is multiple of 3.6 volts, and nickel-cadmium and nickel-metal-hydride - 1.2 volts, since the battery pack consists of separate, successively connected elements with the corresponding voltage.

The presence in the set of the second battery allows you not to interrupt the work to wait for the charging of one battery: while the one is discharged - the other is charging. Positive property Rechargeable tools are their mobility and independence from the presence of power, as well as the absence of danger of lesion. electric shock, negative - restriction of the work time and the need for constant recharging.

Unavailable batteries, as a rule, are only in low-power screws - rechargeable screws. In the rest of the screwdrivers, the battery is removed from the tool for connecting to the charger.

Torque

Maximum torque

Determines how large diameter and the length of the screw will be able to spin the screwdriver, as well as the diameter of the drilled hole in wood material, steel or concrete. It is measured in units of Newton -meter (N · m). The average values \u200b\u200bof the maximum torque - 10-60 N · m. The magnitude of the torque (in fact - the power is screwed) depends on the voltage of the battery used. In network screws, the magnitude of the torque is determined by the tool consumed or output power.

Distinguish several types of maximum torque:

• Soft
• Hard
• Long-time - torque that develops a tool during continuous rotation without a spindle stop.

The numeric values \u200b\u200bof the maximum torque are given taking into account the fully charged battery.

Adjustable torque

Some screwdrivers, also together with quick-to-burn clamping patron, have a spindle with a deepening at the end of the bits or other nozzles with a hexagon shank.

Spindle lock

The property of the spindle scrolling blocking, if the rotational movement is attached from the clamping cartridge, it allows you to conveniently change the nozzles in the cartridge, as it is necessary to keep the cartridge only with one hand. Depends on the design of the gearbox.

Reverse

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

Impact mode

Rotation with impact allows you to more effectively drill holes in concrete, brick and other solid building materials.

Pulse mode

In this mode, the tapping occurs intermittently - measured jerks, which makes it easier to deploy holes on solid and smooth surfaces (the drill will not take away to the side), as well as unscrewing screws with a damaged slot. The 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 twist." Test battery drills. // Demand: Magazine. - October 2007. - № 10. - P. 19-23.
• "A tireless hand." Rechargeable testing test. // Demand: Magazine. - January 2008. - № 1. - P. 15-19.
• Test drills-screwdrots. // Demand: Magazine. - July-August 2010. - № 7-8.
• Screwdriver ... Just screwdriver ... // consumer. Tools: Magazine. - Autumn-Winter 2011. - № 11. - P. 80
• Flight A. "Heroes of our time." Test battery drills - 14.4 volts battery voltage. // Drill to holes: magazine. - 2011. - № 4. - P. 32-43.

Links

Wikimedia Foundation. 2010.

Synonyms:

An electric drill in one form or another today is used in many areas: from conventional drilling to drilling wells and medical surgical applications. Probably, most men currently have such an indispensable tool as an electric train. At least each at least thought about the issue of its acquisition. However, few know when the electric drill was invented?

The first drills began to use even in the days of the ancient Egyptian and Old Indian civilizations. The earliest consisted of 2 sticks and a long cord attached to them. An ancient craftsmen wrapped around one stick to get such a design around one stick and rapidly led the other stick along the axis back and forth. Such a tool was used to get holes in non-solid materials or to mining 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 XIX century, underground work was carried out with manual labor Heavy sledge hammer blows. Then Simon Inghersol was able to construct a shock drill, which was told and rotated a large steel rod. Already in 1870, he improved the boring, providing its steam drive. Such drilling rigs seriously facilitated labor, but progress went ahead. After the invention of electric motors in the 70-80s. XIX century Engineering experts began to think about expanding it practical application. In 1889, Engineer Arthur Jamesarnot was able to drill with an electric motor. Thus, he decided the main question that stood at the time before the industry: a lack of coal for all sorts of mechanized installations.

The potential of the use of the electric drill was highly appreciated. Now, other inventors began to work hard on improving the electric drills. After 6 years, from the moment Arnot registered his patent for the invention of the electric crust in 1895, the Native Brothers Karl and Wilhelm from the German Stuttgart patented a drill, which could work and keep her in his hands. The improvement of the first manual model of the electric crude using the manufacture of its components from light aluminum has 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 the switch and a comfortable pistol handle for the electric drill. The popularity of the new device model was so gradsted that it was possible to grow into a fairly large international concern. Already in 1929, she opened its new branch in Australian Sydney. Already by 1946, when the brilliant inventor of arnot died, the company positioned himself a large Australian manufacturer of industrial and household power tools.

With compressed gas (usually air).

Encyclopedic YouTube.

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Subtitles

Zdarov Friends! I recently had a video about how to translate the old patient a screwdriver on lithium batteries. You really liked the video, but in the comments, many wrote that a screwdriver would be desirable to write from the outlet. Here today we will do. Before redoing your network screwdriver, you can watch ready-made network screwdrivers, such as E-Katalog. We use the filter to limit unnecessary options, and let's see drills and screwdrivers with the mains. On the product page immediately see prices in several stores, which is very convenient. By the way, almost any product in this directory and you can see a video review, you can also add goods to comparison with other selected, and immediately see the differences in the characteristics. And there is absolutely any tool! Use the link to the e-directory will be in the description of the video to start with the fact that the problem is the screwdriver a rather powerful device under load even a weak screwdriver can consume up to 200 watts of battery batteries with it calmly and here to make an outlet you need to make a power supply that will be done from 220 Changes need to constantly voltage Power supplies go mainly by 12 or 24 volts, that is, to redo it makes sense only a 12-volt screwdriver for example, I have another dead nickel battery for 12 volts and from the last video about the alteration of Grandfather Screwdriver here today and we mock by the way if you did not watch the video then see definitely I told me a lot of interesting things about the batteries and gave a lot of tips on how to use them correctly to extend the service life if we go to our favorite aliexpress that we will see that 12 volt power supply units on decent power measured by the way in chinese Watts stands very and very not tasty and at a price comes out a little bit cheaper than a good Chinese screwdriver asks and nafiga alter something at all so that Aliexpress will not help us in solving this problem and therefore I want to offer you another several times more favorable power supplies Frequently powerful guys from computers need to go to any repair of computers not for a couple of hundred rubles to buy a b-tire power supply well, let's say for 500 watts let it be crumpled dirty all in dust but the main thing is that it works on the wall usually written detailed information on power lines Here we can see 25 amps on a line of 12 volts. And this is not a little bit of 300 watts of power for a screwdriver enough with a margin. Such a power supply is certainly quite large but at the same time it is much cheaper even Chinese blocks at a smaller power. By the way, I remind you now. There is a large sale in honor of the birthday of Aliexpress and you still have two more days in order to make a good procurement Jacob's smaller, the Chinese as usual for a week raised all the prices, but now they fell very low on my site there is a bunch of thematic selers for lovers of emptrels of electronics and robotics, that is, all sorts of electronic board modules Sets to build soldering equipment for soldering and working with wires electronic components as well as a bunch of tools that I myself personally used and rented a review on them and by the way the batteries for reworking the screwdriver now, too, can be bought very profitable, but in general, like everyone else uses references to some selections and left in the description by this video And then I think you will figure out the first thing you need to disassemble your native battery and pull out all the batteries from it, also our goal is to preserve the holder terminal and the terminals themselves, so everyone carefully disassemble and release the terminals from batteries I want to make a removable battery to work from batteries and from the network That is half such a universal emergency with terminals and wires to these cream will need to solder a wire cross section Well, say three square milimeters of this should be enough for the energy to do not differ in heat even on the length of the wire of about two meters I don't know how you will have a screwdriver personally it turned out to bend the ears to glue directly into the plasmasska and it turned out very reliably now I remember that we will allow the minus wire to be allowed to be blue and insert the terminals according to the symbol plus and minus on the battery case below, for example, the screwdriver drill through the drill 3 millimeters and remove the bracket with a large drill M3 with a countersunk head and did not stick well and it remains to tighten the wrench I don't know why I didn't do so with the last battery if you remember I made a strut from bamboo skewers Option for flowers Of course, it is also better to put it very much more desirable to put the capacitor parallel to the terminals on 16 or 25 volts and capacity of about 10,000 micro Farad Conde Soror will serve as an energy buffer of starting currents it is necessary to reduce the load on the power supply otherwise it will go to the defense we take and solder

Description

To work with screws and screws, replaceable pumping-inserts (bits) with different tips are used, which are a rod of steel with a shank-resinuited shank on one side, and the 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 screwdriver shank has a thread instead of a hexagon, or a slave cam or other forms of the element transmitting the torque.

Turning-inserts (bits) can be installed as directly into the clamping cartridge (there are bits with a length of 50 mm) and into the bit holder (for pumping-inserts of a standard length of 25 mm) or, if there is a screwdriver in the hexagonal recess.

The suitcase or bag is usually included in the screwdriver, allow you to conveniently store and transport the tool, charger and replaceable batteries to it.

Design

Screwdriver consists of several structural nodes:

• electric motor or pneumatic engine - produces rotational motion;
• the planetary gearbox - forms mechanical transmission from the engine to the spindle, which is installed on the screwdriver clamping cartridge;
• the torque and / or adequation depth of the torque - adjoins the planetary reducer;
• electronic control unit with start button and reverse switch (reverse rotation);
• the clamping cartridge is necessary for connecting work nozzles (bits; wrench heads or rolled) with twisted shaft (spindle);
• rechargeable battery (in battery electrodes) -.

Depending on the design, the gearbox may have a speed mode switch (gear ratio). The casing of the gearbox in screws can be made of metal alloys, or wood (extremely rare). But in most cases, it is plastic - it changes the cost of production and reduces the mass of the tool. Some gear gears can also be made of plastic. The metal body of the gearbox can withstand large mechanical loads and has the best heat sink than plastic. The wooden hulls are practically not used, due to the complexity of production, operation and repair.

Varieties

Sculptors are divided by different kindsDepending on the equipment and destination.

Sculpovyurt

Manual (with rare exception) tool with cam chuck. Designed for drilling and working with fasteners. Has a torque control clutch. May have 1, 2 or 3 rotational speeds. May have a shock function (axial hit, like a shock drill). It does not have a tangential strike function. May have an electric (network, rechargeable) or pneumatic drive. Screwdriver (travel tool) has a wheelbase and a landing cone under the drill instead of the cartridge.

Screwdriver with adjustment of the depth of screwing

Usually called screwdriver for plasterboard. It has a clutch-regulator of the depth of screwing. Sing-speed hand tool. May have a torque control clutch (extremely rare). Not equipped with cam patron. For drilling, drilled with a hex shank should be used. May have a self-feeding device. May have an electric network or rechargeable drive.

Rechargeable screwdriver

Compact manual tool with low power and, as a rule, the presence of spindle lock, which allows you to use it for manual reloading or unscrewing. It has a hexagon holder of pumping-inserts 1/4 ". Not equipped with cam cartridge. For drilling, drilling rolled with a hex shank must be used. It may have a torque control clutch. Does not have a clutch of the reducing depth control. Typically, a single-speed tool exist. operating both from galvanic elements (batteries) and corresponding to them in the form of batteries (AA, AAA).

Gaikovurt

Specially designed tool for twisting and unscrewing bolts and nuts. Wrench called as hand toolsUnder heavy equipment, having a wheelbase (travel motor wrench) or placed only on the suspension. It has a pulse mode of operation (tangential strike function). Not equipped with cam patron. Instead of the cartridge, the wrench has a short square rod (with square sizes in inches: 3/4 ", 1/2", 1 ") for installing wrench heads. The spindle seat has a spring fixing element (as a rule, a spring-loaded ball) or a cross-through hole. To fix the head with a separate ω-shaped spring lock, pin (pin) with a ring or a similar fastening element. Single-speed tool. As a rule, it does not have a rotating torque control clutch nor a screw-to-regulator coupling. To limit the torque, external should be used. Fixtures - torsion. For drilling it does not apply (with rare exception). It may have an electric (network or rechargeable), pneumatic, hydraulic or gasoline drive.

Rovert

Hand-tool, analogue of a wrench, but with the difference that it has a six-generated 1/4 holder "and is used mainly to work with screws and screws. There are combined models that the seating part of the spindle combines an outdoor inch 1/2" and the internal hexadener holder. 1/4 ". For drilling should be used with a hex shank. It may have an electric (network, rechargeable) or a pneumatic drive.

Main characteristics

Power supply

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

Using the connection to the electrical network reduces the cost of the tool and may be preferable in places with the possibility of connecting to an AC outlet, as well as in the absence of limitation due to the length of the current-carrying wire from the tool to the power outlet.

An indicator of the power of a screwdriver operating from 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, as well as in places without power sources. In addition, the electrical leads that run from batteries are safer.

Battery Parameters:

• Voltage (3.6-36 volts) - determines the power of the engine, the magnitude of the torque that the screwdriver can create, as well as the duration of operation from one battery. Average battery voltage values \u200b\u200b- 10,8-18 volts.
• Capacity (1.3-6 amp-hour [A · H]) - affects the duration of work from one battery.
• Type: Lithium-ionic (modern battery type), nickel-cadmium, nickel-metal-hydride. The voltage of lithium-ion batteries is multiple of 3.6 volts, and nickel-cadmium and nickel-metal-hydride - 1.2 volts, since the battery pack consists of separate, successively connected elements with the corresponding voltage.

The presence in the set of the second battery allows you not to interrupt the work to wait for the charging of one battery: while the one is discharged - the other is charging. The positive property of battery tools is their mobility and independence from the presence of power, as well as the absence of danger of electric shock, negative - restriction of the operation time and the need for constant recharging.

Valid batteries, as a rule, are only in low-power electrobrivers and rechargeable screws. In the rest of the electric strokes, the battery is removed from the tool for connecting to the charger. In 2015, Bosch introduced the system of induction charging of batteries (), eliminating the need to remove the battery from the tool for connecting to charger (At the same time, accumulators with induction spiral can be removed from the tool and charge on the usual charger).

Torque

Maximum torque Determines how large diameter and the length of the screw will be able to spin the screwdriver, as well as the diameter of the drilled hole in wood material, steel or concrete. Measured in Newton meter units (N · m). The average values \u200b\u200bof the maximum torque - 10-60 N · m. In some unstressed models, it comes to 100 N · m.

The product of the rotational speed of the spindle and the torque provided by a screwdriver at this speed determines the power of the tool, which is proportional to the voltage of the battery used. To increase the torque in low-voltage models, gearboxes with an increased gear ratio are used, while the rotational speed is reduced. In Network screws, the torque value is proportional to the tool consumed or output power.

There are several types of maximum torque:

• soft,
• hard,
• a long-term - torque that develops a tool during long-lasting spindle stop.

The numeric values \u200b\u200bof the maximum torque are given taking into account the fully charged battery.

Adjustable torque

The torque control coupling allows you to twist screws and screws with the desired force, thereby avoiding the breakdown of the thread, the sharpness of the slot, as well as the wear of the shift heads. As a rule, there are 6-24 regulator clutch positions on digital values \u200b\u200bwith varying degrees of force when twisting or unscrewed (digital designations are usually conditional, and do not coincide with the torque that corresponds to them). For drilling there is an extreme clutch position at which the maximum torque value is provided without limitation.

Control pulses. The power part of the regulator consists of a quick (order of 1 kHz) of the electronic switch, and the inductance of the motor winding as an integral part of the circuit.

Number of spindle speed modes

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

Chuck

By the method of fixing nozzles:

• Quick-step three-tier - allows you to clamp a drill or bit holder without using a clamping key.
• Key Threeculatory - To secure the part in such a cartridge, a toothed clamp key is required.
• A quick-change holder is usually under the 1/4 hexagon, it allows you to quickly replace the bit to another.

By number of couplings:

• Union - used with the spindle lock function from scrolling during the shift of the nozzles.
• Bimufts are used with screwdrivers that do not have spindle lock functions. One coupling is used to hold the cartridge, the other is for the clamp.

The average maximum clamping diameter of fast-mode and key cartridges is 10-13 mm.

Some screwdrivers, also together with quick-to-burn clamping patron, have a spindle with a deepening at the end of the bits or other nozzles with a hexagon shank.

Forced spindle braking

It is used to reduce the spindle lower after the smoke button is released to stop the spindle occurred as close as possible by the time you stop pressing the button. This makes it possible to eliminate excessive turning of the knurable part, increasing the accuracy of its installation. The braking function is useful in cases where the screw, screw or nut is tightened not to the end.

The load goes to thermal and dissipates.

Spindle lock

The property of the spindle scrolling blocking, if the rotational movement is attached from the clamping cartridge, it allows you to conveniently change the nozzles in the cartridge, as it is necessary to keep the cartridge only with one hand. Depends on the design of the gearbox.

Reverse

Changing the direction of spindle rotation for unscrewing fasteners. The reverse in screw leads is usually electric, that is, switching occurs by changing the polarity of the supply voltage motor. To control the reverse there is a two-position switch, which additionally may have the function of its lock from pressing when the switch is in the middle position.

Impact mode

Rotation with axial impact (like a shock drill) allows you to more effectively drill holes in concrete, brick and other solid building materials.

Pulse mode

In this mode, the tapping occurs intermittently - dimensional jerks (tangential blows), which makes it easier to deploy the holes on solid and smooth surfaces (the drill will not take away to the side), as well as unscrewing screws with a damaged slot. The pulse regime does not occur in the actual screws. The tool specifically designed to create a tangential strike is a wrench (screwdriver).

I woof, I want to fix it. How to choose a screwdriver

Electricity everywhere entered our lives. It heats and illuminates our dwellings, cooks, fries, ferry, helps in construction and repair, the work of many devices and devices that facilitate the existence of a person depends on it. Praphrazing the famous expression, it can be said that today "without electricity and neither there, and neither here."

In our life, there are often situations when you have to work on a great distance from network sources of nutrition, when no extension can solve the problem of delivery of electrical energy. Then rechargeable tools come to the rescue, in the list of which one of the most common is a screwdriver. These devices are increasing confidently capture leading positions in manufacturers catalogs construction tools. The reason is clear: the interest of buyers to these compact and mobile tools is growing by a giant pace. Today on the market the choice of these tools is quite large and the problem is only the screwdriver to choose.

Using the latest technology And rich experience manufacturers, produce all new models. At the same time, designers developing screwdrivers are guided by the following principles: improving productivity, reduction of weight and dimensions, improve ergonomic characteristics. We decided to tell about the features of some cars, how to choose a screwdriver, to pay attention in the first place.

From the history of the screwdriver

The history of the appearance of electrical screwdrivers is inextricably linked with the invention of electrical engines, the basis of which the principle of electromagnetic induction lies, the open English physicist Michael Faraday in 1831. One of the first electric motors was created in 1834 by the Russian electrical engineering Boris Jacobi, the purpose of which the experience of which was reduced to the transformation of electrical energy into mechanical.

The first electric motors were far from perfect, and the batteries from which the nutrition was on them were distinguished by large dimensions and a small capacity. Nevertheless, already in 1838, Jacobi, setting the electric motor of its own manufacture on the rowing bot, and having committed, along with ten satellites, a short journey through the Neva, showed the world with one of the opportunities of his invention.

Nowadays, electric motors have found the use of almost all areas of human activity, both in everyday life and industry.

Similarity and differences

The fact that the screwdriver is the instrument is necessary, and in the farm work will always be found, it is unlikely that anyone will argue. Initially, these devices were capable only twisting-unscrew, but in the process of evolution they acquired a drilling function and now spin-unscrewing a dozen-other self-screws, and if necessary, and drill a hole in a tree or metal - as they say, we are glad to try.

Often, simple inaders do not see the difference between the battery screwdriver and the screwdriver. And the difference between that is. Screwdrivers are designed to twist-out, the spindle has only hexagon bits, with a cross-shaped or flat head, use full-fledged drills it is impossible. Although on sale you can find special drillsintended for battery screwdrivers, but you agree it is not that. In addition, screwdrivers, as a rule, are not distinguished by good power of the electric motor and it is impossible to use the drills of a small diameter in screwdrivers.

The closest to the screwdrivers drove, but they do not have a reverse allowing you to unscrew the bolts, screws, screws. Therefore, the most economic part of the population prefers the screwdrivers, although many of them, before choosing a screwdriver, will not prevent to know about some characteristics, adjustments of these wonderful tools.

What to pay attention to when choosing

So, by type of power, the screwdrivers can be network or wireless. The main characteristic of any power tool is the power that the network screwdriver is determined by the parameters of the motor installed in it. In the case of wireless models, you must pay attention to the characteristics of the entire complex. In this case, the power of the tool largely depends on the autonomous power source, simply speaking, the battery. Here you need to pay attention to the "voltage" of the battery than it is higher, the more difficult work is capable of performing a tool. The battery voltage that is measured in the volt (B) depends on the number of batteries in the block. To perform simple household tasks, a sufficiently screwdriver with a power supply by 12 or 14.4V. For more serious tasks or professional activities, you will need a heaving and powerful 36 volt model.

Undoubtedly, evaluating the power of certain screwdrivers on the basis of the battery only from the "Waltage" of the battery would not be quite correct. In order to evaluate the screwdriver better, it is also necessary to know the battery capacity, which is measured in ammers (Ah). It is from the battery capacity that depends on the operation of the device on one charging. Screwdrivers intended for household needs Usually equipped with a battery with a capacity of 1.2-1.5 and. Batteries with greater capacity are installed on professional devices. In order to estimate the power of the screwdriver, it is necessary to take into account both characteristics.

The use of the 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 in the production of fasteners. Therefore, most modern screwdrivers are equipped with a two-speed gearbox, which makes it possible to significantly simplify work. In addition, the two-speed regime saves the reserve of electrical energy in batteries. There are models equipped with a three-speed gearbox, but this group of screwdrivers is very small and has a high cost. It can be attributed to BHP 451RFE (Makita production), DCD 925 B2 (manufacturer Dewalt), etc.

Another important characteristic of the screwdriver is torque, that is, the torque that is capable of creating a tool. It is measured in Newtonmeters (nm). When choosing a screwdriver is guided simple rule: The lower the maximum turnover, the higher it is torque. Each model presented on the market has an individual torque. For example, BDF 454 RFE (Makita) has a torque of 80 nm, which allows them to work with large fasteners and drill various holes, but the DS10DFL model from Hitachi with large self-draws may not cope, especially if they are twisted into the solid wood tree or Metal, because The torque of this screwdriver is only 22 nm. Therefore, the buyer in order to find out the specific numbers must be looked into the technical passport of the tool like.

The design of any screwdriver includes a torque adjustment coupling that is necessary for dispensing the power of the device. Do not be it, when working, you can easily break the nozzles, "lick" the heads of the screws, etc. Modern screwdrivers have up to twenty torque adjustments, which is selected depending on the class class. If you choose the clutch setting correctly, the screw head is not drowned, and the slots will remain integer. When choosing a screwdriver, it is desirable to try out the work, as they say, without departing from the box office. To do this, in the store or on the market, taking the device in hand to set the minimum value on the coupling, after that, turning on the screwdriver, try to keep the spindle cartridge. If the strength is missing, you should search another model.

By the way, a two-or alone cartridge is included in the standard configuration of the screwdriver. It is more convenient, of course, alone, as in bimuft to secure the bit or drill, you need to act with two hands while holding the lower ring with one hand, tighten the second top. A single cartridge greatly facilitates this operation. Screwdrivers with this device are equipped with a spindle lock. While the motor works, he rotates with him, but it is worth the motor to measure blocking, the spindle will fail to move from the spot, even attaching considerable efforts. It remains only to insert a drill or bit into the cartridge and tighten it.

Often, in the process of work there are situations when the screwdriver is not able to reach "goals" due to various obstacles: angles, narrow openings, etc. For this purpose, manufacturers offer angular nozzles that allow not only twisting-unscrew the screws, but even drill holes.

In conclusion, a few words about the nutrition of the screwdriver. One of the most "survivities", despite the emergence of new models, the old good nickel-cadmium battery is considered. He has a lot of advantages: it is inexpensive, not afraid of long-term storage, it can work both in low and high temperatures etc., but (very important) so that it serves a long time, the energy in it should be produced to the end. Only after that it can be put on charging. Otherwise, the battery capacity will decrease and in the near future it can be thrown. In addition, it should be borne in mind that this type of batteries contains materials that differ in high toxicity, so the disposal of their business is also not simple.