What is the engine brake in an electric screwdriver what it is

Choosing a suitable for certain tasks of a screwdriver, you should pay special attention to different properties. In the midst of them, not only the power of the device and the capacity of its battery are important, but also an additional battery voltage, but the value of torque is the value.

During construction and repair work, the screwdriver is an indispensable tool that simplifies the tightening of various types of fasteners, and sometimes even drilling holes. And, despite the fact that there are two options for the execution of this device. Network and battery, more often the last option is selected to perform household tasks. At the same time, attention is drawn to the parameters of the power tool itself and its characteristics such as voltage in electrical screwdriver, its power, torque and battery capacity. Each of these indicator is important for evaluating and the correct choice of the device. While buying because of suitable power or voltage alone is not worth.

The main parameters of the battery and the tool itself

The main of the parameters that characterize the work of the screwdriver is the voltage of the battery, on which, in turn, the power of the electric motor and torque depends. For household models, the difference between screwdrivers in voltage is small. On average, it is in the range of 10.8–14.4 V. Productive options designed for constant use can be equipped with 24–36 volts batteries.

It depends on the type of battery. To answer what the difference is, you can, knowing what metals were used for its manufacture. For nickel-cadmium batteries, large in size with a similar capacity, the value of the indicator is a multiple of 1.2 V (it is the voltage of one element that is composed of a battery block), for lithium-ion-3.6 V of lithium-ion.

Among other, no less important characteristics can be noted:

  • The power of the electric screwdriver, by which it is also possible to determine the speed of twisting of screws and self.Tapping screws. To carry out repairs on their own, there are enough models with a capacity of 500-700 watts. Professional repairman will need more powerful equipment-800–850 W;
  • The number of revolutions of the rotating part of the device per unit time. According to this parameter, it is determined whether the screwdriver can fulfill the task set before it. For example, to tighten the desired type of fastener. So, for the bolt, self.Tapping screw and screws, 500 rpm will be enough, for drilling it will be needed already 1,200 rpm;
  • Twisting the moment, the value of which can be one of the main answers to the question of what the volthaccomulator of an electric screwdriver affects. By this characteristic, you can determine both the diameter and the length of the twisted screw or self.Tapping screw. For large fasteners, as well as for drilling deep and wide holes, and for solid materials, a serious value of the rotating moment is also required. The maximum value of the indicator is 10-60 nm.

Bosch IXO против Xiaomi MIJIA. Битва шуруповертов. Китай против Германии.

There are two types of torque of screwdrivers. Starting (larger in size and required to launch the device to work) and constant, that is, a worker. The value of the parameter in modern equipment models can be adjusted. Find out how many modes can be selected from a particular device, you can find out in the documentation available on it. Over, in tools with a pulsed mode of operation (turning on the rotating part with jerks) the capabilities of screwing more. Allowing to periodically increase the torque, they can screw a larger screw.

FAQ: how to choose an electric screwdriver

Anyone who at least once rubbed the corns with a screwdriver, trying to unscrew the rusty screw or twist a dozen screws.

What should be a screwdriver. Power

You think that the larger it is and the larger W, the better? Not certainly in that way. I bought it on pila.Prom.Ua.

The issued torque value of the electric motors does not constantly and depends, first of all, on the speed of the motor, the higher the speed, the lower the moment on the shaft.

In addition to the voltage of electric screwdriver and its power, the battery capacity should also be evaluated. The characteristic is measured in ampere hours or milliampere hours. The larger the indicator, the longer the screwdriver can work out without recharging.

The average battery capacity of the household model is 1300 mAh, which is enough for 2-3 hours. Professional equipment requires more work time. And the master who uses the screwdriver throughout the working day, it is worth purchasing a model from batteries of 1.5–2.0 Ah.

Features of choice

When choosing power, it is worth taking into account not only what power of the electrical screwdriver is indicated in the information from the manufacturer. Due to too much performance, the device can tighten the screws too strongly, pressing their hat to the surface. As a result, the appearance of the coating spoils, and the fasteners, if necessary, is almost impossible to unscrew.

When choosing which voltage is better for an electric screwdriver, it should be borne in mind that the voltage is the main parameter of the device. So, for example, the power of the Makita DDF343SHE electric screwdriver engine is 700 W, at a voltage of 14.4V and a battery capacity of 1300 mAh and a rotating moment 36 nm. While the other Hammer ACD182 model has a weaker engine (22 nm) and not such a capacious battery (1200 mAh). And it seems that this device is about 40% weaker. However, due to the voltage of 18 in Hammer, he is able to tighten more fasteners without recharging, even yielding to the competitor in the capacity of the battery.

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Understand why a less productive at first glance the screwdriver is inferior to a more powerful one, you can, having made a small calculation:

In the process of choosing a screwdriver, it is advisable to take into account the presence of a spare battery in the kit for it. Some models have even 2 additional batteries. On the one hand, such a set will cost more (especially since the cost of the battery is up to 80% of the equipment price), but it will be much more convenient to work with it. At the same time, an additional battery does not need an additional battery. The time performed with its help rarely exceeds 1-2 hours. Whereas in the process of constant use of a screwdriver (for example, for repair work or furniture assembly), the second battery allows you not to interrupt the work longer than a few minutes. The discharged battery is placed on charging, and the spare is installed in the device.


The brushes of the electric motor are contacts through which the current is supplied to the rotor winding. Since the rotor is intended for rotation, the current in its windings cannot be supplied through a stationary wire connection. For this, the collector-minute node (KSHU) serves. The collector consists of copper plates fixed on the isolated section of the anchor shaft. Conclusions of rotary windings are connected to them. The brushes are attached close to the collector. When the rotor rotates, they glide on the collector plates. Currently goes through these sliding contacts in anchor windings alternately. An alternating magnetic field arising from this is the force rotating the rotor.

Knowing how the node that feeds the armature windings works, it is easy to guess that its details should wear out. The rotor is difficult to manufacture and expensive unit. Therefore, to protect it from wear collector, Material for the manufacture of brushes intentionally selects less resistant to abrasion. Otherwise I would have to replace the brush, but the anchor. Another necessary property of brushes should be good electrical conductivity. Better than others these conditions corresponds to a mixture of copper powder with graphite. Electric motors with lower power or higher than that of an electric screwdriver can be equipped with graphite brush brushes. And the engine with low operating voltage and large currents of the graphite is not suitable due to too much electric resistance for it.

How the household drill differs from professional?

Household drill is not designed for long.Term work and serious loads. Providing home tools, manufacturers pay considerable attention to design and ergonomics, putting the right to use, not a high resource. So, a gearbox in household drifts, as a rule, plastic. But, despite the fact that such details are subject to rapid wear, a household drill copes with its tasks quite successfully. Nevertheless, even as a home, many buyers prefer to have precisely a professional drill, equipped, for example, with a metal gearbox or a dustproof body. At the same time, the choice of a professional drill is largely determined by the brand of the manufacturer. Bosch, Makita, Metabo, Dewalt tools are popular.

Extended functionality, which is possessed by two speed drills, allows you to use them more efficiently, compared with single.Speed models. Having chosen lower speed, they drill large holes, work with fasteners, mix the solutions with a mixer with a nozzle. The second, higher speed is used to quickly drill holes of small and medium diameter. If the drill is not equipped with a two- or three-speed gearbox, then when working you need to be somewhat caution. When drilling holes of large diameter at high speed, breaks should be made in order to avoid excessive overheating. It is important not to tighten the screws not to press the trigger, which helps to avoid high speeds, because of which you can pull the fasteners.

What is the engine brake in an electric screwdriver?

A useful option is the engine brake, thanks to which an electric screwdriver instantly stops immediately after you released the power button. Modern professional screwdrivers have a battery charge indicator. Some models of Metabo screwdrivers have an additional impulse operating mode.

The engine brake is a device that stops the anchor rotation at the time of release of the launch button. In screwdrivers, this function is implemented by closing the plus and minus of the engine when the button is released. If the engine is not operated, then you will need to replace the control transistor or start button.

What is the best drill electric screwdriver?

Rating of the best batteries-scourge

Category Place Name
The best compact drill-shurules on batteries one Bosch GSR 120-Li 1.5ach x2
2 Bosch Easydrill 1200 1.5ah X1 Case
3 Makita DF330DWE
4 Ryobi R12DD.Ll13s

The mechanical part

The basis of the mechanical part is a gearbox of an electric screwdriver of a planetary type, which provides the transmission of torque from the engine shaft to the output spindle with a decrease in the speed of rotation. The most important elements are the ring gear, drive and satellite.

The main elements are placed inside the housing of the electrical screwdriver gearbox and are alternately combined with each other, starting with the solar gear of the rotor through the oil seal. The design includes the following elements: screw, flange. Puck, satellites, gear, spindle, teeth sleeve. Balls and sleeve are used to install the braking and cartridge mechanism. Depending on the number of gears-satellites, a decrease in speed can be one, two or more stepped.

The gearbox is driven from the solar gear of the rotor. The rotation is transmitted to the ring gear in the form of a cylinder with teeth with the necessary step. They are introduced into the clutch with satellites on the pins drive, between which there is a sunny gear. Reducing Rowing Rotation is ensured by the rolling of gears-satellites along the ring gear.

Self.Repair button: tips

The diagram of the device gearbox of the battery electrical screwdriver.

Well, now let’s move directly to the recovery process. As a rule, the button is not so easy to purchase. Often you have to make a preliminary order in the service center, and then wait a few weeks while it arrives. That is why the repair of the button of the electric screwdriver with your own hands is relevant.

It can be noted right away that the wires that go from the button are not necessary to solder. They do not interfere with the process of assembling and disassembling the structural element. So, the electric screwdriver is disassembled using the same technology that was indicated above, which means that the button is in the immediate vicinity, that is, various repair work can be carried out with it. First you should remove the pressing mechanism. This must be done extremely neatly so that the base is not damaged.

Read also: How to connect LEDs to power supply

Do not remove the clamping mechanism with a sharp jerk. It is best to use slow rotational movements clockwise or against it. Here, too, it all depends on the specific model of an electric screwdriver. Now you can proceed directly to repair, more precisely, to identifying problems that have led to a malfunction.

On any button product of this kind there is a protective mechanism. It needs to be removed too. To do this, you will have to use improvised tools, namely a flat screwdriver and knife. Moving in a circle, you need to free the latches. This is done extremely simple, so it should not cause any problems in the work. Now you can remove the button cover under which the reverse mechanism is located. In fact, the inclusion element itself is not yet visible. He will have to get to him again.

To do this, pick up a soldering iron and rosin. It helps to warm up the rations, which leads to the separation of details. In this case, two compartments must be divided among themselves. First, the soldering iron is immersed in rosin, and then leaning against the separation site. As a result of these manipulations, the mechanism from a single whole is divided into two parts. But now you can try to get to the switch. For this, the cover is removed from the corresponding compartment. Now the compartment of the inclusion of an electric screwdriver becomes a completely open human gaze.

Next, you need to gently extract the mechanism from your rightful place, while holding a return spring installed here without fail. Now you can look inside. Each person at this moment with the naked eye is able to see that all the contact sites were erased during operation. The main reason for this is most often the low quality of the metal that is used to create these sites. As a result of the fact that the material is destroyed, its dust gradually settles between the contacts. This leads to the fact that those surfaces that were once dielectrics become electrical conductors. This is often the reason for the spontaneous inclusion of power tools.

Since the reason is identified, respectively, it remains only to eliminate it. It is done quite simply. With the help of the most primitive and simple materials, it is worth removing dust from the surface of dielectrics. To do this, you can use the most ordinary cotton wool. It is desirable to mrain it in alcohol. If this method does not help remove the remaining dust, then you will have to use the knife. With it, you can try to scare the contacts. Some use sandpaper for these purposes, but this is not recommended to do this, since the surfaces of contacts can be irreparable harm. That is, in this case, it turns out that the repair becomes not for the good, but reduces the whole result to a negative value.

The basic parameters of the device and the principles of action of an electric screwdriver

Equipment in the construction market, where screwdrivers occupy a separate place, is quite large. Some models own personal aspects, characterized by assembly quality and price. In general, most models are characterized by the basic principles of act and internal implementation.

To the basic elements of at least some electrical screwdriver can be considered:

  • The presence of an electric motor;
  • Planetary reductor;
  • Adjustable multifunctional button “Start”;
  • Reverse switch;
  • Effort regulator;
  • Power unit.

The electronic engine is powered by a network of unchanged current, structurally represented by a cylindrical shape. Snutsi placed an anchor with brushes and magnets. The peculiarity of the electronic circuit of the motor implies that the direction of the voltage supply will be focused on the brushes. When the powerful polarity changes, reverse motor movement occurs.

Planetary gearbox is a fundamental element capable of converting high.Frequency fluctuations in the electrical shaft into a low frequency of cartridge shaft. As a rule, these parts are made of wear.Resistant plastic or metal. Many screwdrivers are equipped with gearboxes at 2 speeds. Switching to the first speed mode is necessary for working with self.Tapping screws, and at the second speed it is possible in a wood, plastic base or metal.

The Start key is starting the device. It is able to control the number of revolutions, providing for the ability to choose the optimal speed of rotation for the cartridge shaft. Accordingly, a powerful press will drive the engine at high speeds, and with a decrease in the power of pressing the power criterion, it will weaken.

The reverse switch is necessary for the operation of changing the rotational direction of the engine of an electric screwdriver. This functionality is convenient to use not only for twisting, but also to twist screws.

Regarding the regulator of efforts, we can say that it determines the speed of tightening screws. Actual models provide for a 16-speed adjustable gradation, which allows with maximum accuracy and convenience to determine which tightening speed is relevant, working with various material.

If an electric screwdriver does not want to turn on, checking the charger unit

It does not matter which brand an electric screwdriver fails. Bosch, Makita, Interskol, Metabo, Bison, Dewalt and others. If the tool does not start, then first it is necessary to check the presence of a battery charge, and its serviceability. To do this, put the battery for charging (for 1-2 hours), and then set the battery back and check its performance. If there are no signs of life, then you need to arm yourself with a measuring device called a multimeter or tester with which diagnostics will be performed.

It is interesting! If you pick up a multimeter, you probably know how to use it. If not, then you should familiarize yourself with the instructions.

Using the multimeter, we will find out what is the cause of the breakdown. The battery or charger. First, find out the serviceability of the charger. To do this, do the following actions:

  • Set the multimeter in the mode of measuring constant voltage to the face value of 20V. If the battery on the tool has a 24V face value, then you need to install a 200V denomination on the device
  • Insert a fork of charger into a socket
  • Measure the output voltage at the terminals of the charger

Cordless screwdriver drill. What to look for when choosing a tool?

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Its testimony should be 2v more than the value of the battery, for example, for a 12V battery, the readings of the charger must correspond to the value of 13.5-14V. If there are no indications below or at all, it means that the charging block is faulty. It can be repaired if there is knowledge in electrical engineering. If the charger does not work, then you need to buy a new block of a similar brand.

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