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How to remake a cordless screwdriver in a network with your own hands: instructions, tools and materials

Screwdriver refers to the most commonly used in everyday life and production types of tools. This device is in demand for the performance of electrical and construction works, as well as for the assembly of furniture and other items, the design of which provides for the presence of threaded connections. A cordless screwdriver has such advantages as compactness and mobility. Nevertheless, many owners of this tool often wonder how to remake a cordless screwdriver in a network.

What is the reason for this? When using it, one has to face such a disadvantage as low energy consumption, which forces the battery to be recharged every 40 minutes of intensive operation. On the other hand, with a rare use of the device, the spontaneous discharge of the battery leads to its breakdown due to the destruction of the constituent elements. It is impossible to repair the battery that has become unusable, with the acquisition of a new one, difficulties may arise: often the component parts are sold only by the official representatives of the manufacturer, and the cost of the new battery is slightly inferior to the price of the new screwdriver.

What are the benefits of changing the type of food

A household screwdriver with a failed battery can be switched to mains power by making some changes to its design. This does not require a significant expenditure of money, time and effort. At the same time, the advantages of such an instrument transformation are obvious:

  1. Discharge of the need for regular charging of the battery, and with it forced interruptions in the work, since the duration of such a procedure is 3 hours or more.
  2. A constant value of the current strength, which does not decrease as a result of a gradual discharge of the battery, will ensure a constant torque.
  3. If there is no need to use the tool, its long simple will not lead to deterioration of technical parameters.

The only drawback when working with a network screwdriver is the dependence on the presence of electricity.

Preparatory stage

Before starting work, all necessary materials should be prepared. All of them are inexpensive and are on sale. Some structural elements, such as a battery or power supply, can be taken from old, no longer used devices.

Before changing the cordless screwdriver into a network, make sure that:

  • Charger and battery (from the screwdriver itself);
  • Soft multicore cable;
  • Soldering iron;
  • Acids;
  • Solder;
  • Tape.

Power Supply Selection

The power supply provides conversion of an alternating current, the voltage of which is 220 volts. Screwdrivers consume DC with a nominal value of 9-19 V, so the connection to the network is performed using an electronic transformer, for this purpose it is better to use the products of the brands Toshibra and Feron.

Transformers of these brands are reliable in operation, compact enough, light, do not complicate the movement of the instrument. Their load characteristics correspond to the parameters that a screwdriver has for a house - decreasing during overloads, they protect the tool from damage. In the design of devices there are 2 input and output wires, they allow providing power to halogen lamps and other types of electricity consumers with a voltage of 12 V.

Design features of electronic transformers

Increased leakage inductance provides a falling characteristic, additional galvanic isolation increases the safety of the power supply. By changing the number of turns of the primary winding, you can adjust the output voltage, adjusting it for a certain type of screwdriver.

Due to the implementation of tapping the secondary winding from the midpoint, it is possible to use a diode bridge rather than a diode bridge, and a full-wave rectifier equipped with only 2 diodes instead of 4. This will reduce the power loss by a factor of 2.

Capacitors C1 and C2 smooth low-frequency and high-frequency pulsations, LED HL1 can be used to test the operation of the unit. Resistor R1 limits the amount of charging current supplied by the capacitor, the R2-R7 load resistors ensure the start of the power supply.

Connecting the cable to the terminals of the charger and battery

Converting a cordless screwdriver to a network requires a strong connection of the wire to the charging and battery terminals. When performing the operation on the charger, the cable with the terminals is usually connected by soldering, but it can be replaced using a crocodile clip. Before the start of work, the surface of the soldered parts is treated with acid. You can also use special solder.

When connecting the cable to the battery terminals, it is not recommended to use the clamps - during operation such a fastening will be disconnected. The only reliable way is to solder the ends of the copper core to the contacts. It is most convenient to use the battery of the screwdriver itself. Previously, it is disassembled to remove the exhausted batteries. It is advisable to protect the skin of the hands and the respiratory tract from harmful substances contained in the old filling of the battery.

Inserting and securing the cable in the battery case

Then you need to clean the tool. Screwdriver in the location of waste elements is treated with rags moistened with a weak alkaline solution, then with ordinary water. To dry the case, wipe it with a clean flap. After the moisture has completely evaporated, the ends of the cable are soldered to the contacts located on the inner wall, in accordance with the polarity.

If it is broken, the direction of rotation of the screwdriver will change, and hence the position of the button that switches the reverse. To insert a wire inside the battery case, a hole is drilled in it. From the inside of the appliance wall, the cable is fixed with an insulating tape and insulation removed from the wire of a larger diameter.

To prevent pulling and breaking of the wiring, an insulating jacket is put on it and fixed to the surface with several layers of insulation tape. To eliminate the displacement of the center of gravity, it is necessary to compensate for the change in the mass of the handle of the device by adding a counterweight. As it can be used a piece of pressed rubber.

What to do when there is no charger

It is also possible that the charger is lost or broken. How to remake a cordless screwdriver in a network with your own hands in this case? Use a battery for use with another technical device.

The main condition in this case: a household screwdriver must have the characteristics corresponding to its parameters - not only the voltage, but also the current. For example, when using a car battery, higher values of this index contribute to overheating and quick breakage of the electric motor.

Thinking about how to remake a cordless screwdriver in a network, you can use a car battery. But this option is suitable only for those cases where it is necessary to produce a small amount of work. The connection is the same as the above connection to the terminals of the charger.

The combination of a car battery with a portable power supply

This is one of the possible solutions to the problem. Consider how to remake a cordless screwdriver in a network using a power supply. A soft cable is connected to the terminals of the instrument, an electric plug is attached to the second end of the tool. In order to make the power supply unit, it is enough to connect a rectifier to any transformer with the appropriate screwdriver parameters. Its task is to convert an alternating current with a voltage of 220 volts. Screwdrivers of different brands require the supply of a constant current of a certain value, which can be adjusted by increasing or decreasing the number of turns on the transformer coil.

With a lack of experience in this area, it is better to use a ready-made transformer with the necessary characteristics and equip it with a rectifier. The rectifier bridge diodes must match the screwdriver model you have. Its connection is made according to the standard scheme.

How to avoid doing unnecessary operations with a computer power supply

The method described above has a significant drawback - its implementation is associated with certain difficulties. But there is an easier way out. To do this, you need a power supply from any computer. We'll figure out how to remake a cordless screwdriver in a network with it.

The main advantage of a computer power supply is its versatility. With the correct connection of the wires, you can get the currents of any value - it does not matter what parameters your tool has. Screwdriver used when using a similar transformer will be most convenient.

The presence in the power supply of the cooling system guarantees the duration of its operation. It is important to place it in the insulating housing, ensure the grounding of the device and install an electrical outlet on the rectifier wall. Emergency shutdown of the power supply is carried out by the tumbler located on the rear panel of the case.

Inverter welding

If the house has an old inverter unit, you can use it to re-equip the screwdriver. But it is necessary to take into account that the currents given out by welding do not correspond to the required ones, and this forces to make changes in its design. The secondary coil must be connected to the components in the device. This work requires analysis and calculations, which without the knowledge of radio technology can not be independently implemented.

The rules of using a screwdriver that has undergone modernization

We examined various options for answering the question of how to remake a cordless screwdriver in a network. Useful tips that can be useful when working with an advanced tool:

  • After every 20 minutes of using the screwdriver, it is necessary to give the motor about 5 minutes of rest;
  • So that the cable does not interfere during operation, it can be fixed at the elbow level, leaving some margin of length in the arm area;
  • Periodically it is necessary to clean the power supply unit from ingress of dust;
  • When using a power supply, it is advisable to limit the number of extenders;
  • Screwdriver, adapted to the use of voltage from the network, can not be used for high-altitude work - at a distance of 2 meters or more from the ground;
  • Categorically it is forbidden to work with an ungrounded power supply.

Adhering to the above rules, you can increase the service life of the screwdriver, the design of which was changed. It will become less mobile, but this is compensated by the lack of the need for regular recharging of the instrument. An additional advantage of rework is that you will not need to purchase new batteries in place of those that have failed.

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