How to make the screwdriver work from the mains

How do you test your Screw Driver Tester.

Equipment installation

The screwdriver can be equipped with drills or nozzles for twisting and unscrewing screws. When the desired bit is selected, it is necessary to rotate the chuck sleeve counterclockwise until its jaws are separated by a distance sufficient to insert the drill shank or screw bits between them. Then the clamp is made in the reverse order. There are two types of cartridges:

  • the clamp is made without a key, but only by rotating the cartridge case by hand;
  • requiring pressure with a special key, which is inserted into the recess in the chuck and rotates it, leaning against the toothed rim, for example, as in the Dnipro-M 1/2 ″ x20 gear chuck.

How to remove a chuck from a screwdriver, for example, to lubricate it or replace it if it does not fix the nozzle poorly. In modern models, the chucks are screwed onto the shaft and, for reliability, are locked with a screw with a left-hand thread. This is how the cartridges are attached in Makita, Bosch, etc. screwdrivers. It is necessary to unscrew the screw and unscrew the cartridge by rotating counterclockwise. Detailed instructions on how to do this are available in the documentation for the tool.

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Good to know

How to use a screwdriver? 5 basic rules

The screwdriver has become one of the most popular when working on interior decoration. This is explained by the widespread use of wall panels, suspended ceiling ceilings, and the use of wooden battens as cladding material. These works require the massive use of screws and a screwdriver to screw them into the surface. Therefore, the issue of correct operation of the device so that it works for a long time and reliably is relevant. In the article we will talk about cordless screwdrivers, as the most popular type of this tool.

Is it possible to cut a thread with a screwdriver

It is possible, but with reservations. Firstly, small diameters, up to 10 mm. You will definitely not cut a thread on a ¾ ”pipe. Secondly, only internal. You will not install the die on the screwdriver. Third, skill is required. A slight misalignment and that’s it, either break the tap or just ruin the thread. Minimal cutting effort!

How to store a screwdriver

Better separate from the battery. If you have a model with a nickel-cadmium battery, then before ending work and disconnecting the battery, it must be completely discharged. After removing the battery, it must be charged. Remember that Ni-Cd has a high self-discharge current, therefore, during long-term storage, it needs periodic recharging.

Preparing the screwdriver for work

To bring this device into working condition, it is necessary:

Pull it out of the case and inspect for visible damage. cracks on the case, etc. If they are found, use the tool is prohibited.

After inspection, dock the battery to it, and then make sure that there is enough charge to start work. If the battery slowly rotates the tool spindle, you need to remove the battery and put it on charge (see below for how to recharge the battery), and connect another battery to the tool instead.

After making sure that the battery has gained a sufficient charge, the required nozzle is installed in the screwdriver, depending on the nature of the work (tightening screws or drilling) and the size of the screws. We will tell you in detail about installing the attachment further, but here we focus on the fact that for the safety of work during installation or replacement of the attachment, the battery must be removed so as not to accidentally turn on the screwdriver.

Using the knobs on the instrument, you can select:

  • operating mode. drilling, working with screws, in some models there is also an impact mode, for example, Bosch GSR 180-LI.
  • the speed of rotation of the nozzle (if the model of the tool has several stages of rotation, for example, Makita DF347DWE); direction of rotation. for drilling and screwing screws clockwise, for unscrewing screws. counterclockwise.

If you are going to drill to a certain depth, then in models of screwdrivers where there are limiters on the drilling depth, you must set it.

Remember that the correct preparation of the tool is the key to the safety of working with it.

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How to use a screwdriver correctly and safely

Working with this tool is intuitive. But you need to know certain subtleties that reduce the risk of injury and tool breakage. So, how to screw a self-tapping screw with a screwdriver safely:

Read the instructions carefully BEFORE using the instrument for the first time, and not after something unpleasant has happened.

Correctly select the maximum torque at which the safety “ratchet” will work and the force will not be transmitted to the shaft. The tool is of course designed for maximum effort. But, firstly, constant work at the maximum reduces the service life. Secondly, the likelihood that the screwdriver can pull out of the hands increases. Thirdly, by learning how to correctly determine the maximum torque, you will reduce the likelihood of damage to the surfaces where you screw the screws. This is especially true for polished and fragile surfaces. For example, in the Bosch GSR 10.8 model, the maximum torque is 30 Nm, but 5 Nm can be set.

We choose the right mode of operation. It is not necessary to drill in the screwdriver mode, and even more so to tighten the screws in the drilling mode, where the speed is higher. The tool may simply be snatched from your hands.

Do not forget to control the direction of rotation. We tighten the screw. the cartridge should rotate clockwise, we unscrew it. against.

Do not change any cutting mode settings on the fly! This threatens to break the screwdriver and is unsafe.

Above, we talked about the rules of safe work relating directly to the screwdriver. Now about the general organization of work with this tool:

  • Work only with protective goggles and preferably with protective gloves, especially if you are drilling materials that can crack and “shoot” sharp fragments.
  • Before drilling, make sure that there are no electrical cables and other utilities in the area.
  • When tightening and unscrewing screws, as well as drilling small holes in diameter, do not lean on the screwdriver. The screw or drill bit may break and injure you.
  • Household and professional screwdriver models have different continuous operation times. In any case, it is! And it’s not worth bringing the instrument to a hot state.
  • After work, you need to disconnect the battery, remove the attachment, wipe the tool from dust.

How to understand whether a laptop is charging or not?

To determine that the battery, when properly connected, has stopped charging. you need to move the mouse cursor over the battery icon in the lower right corner of the monitor. If the inscription “connected, charging” does not appear, then it has stopped working.

How to make your laptop work on AC power without a battery?

How to connect a laptop without battery power?

  • Turn off the device completely and unplug it.
  • Turn the device over and open the battery compartment.
  • Remove the battery from the case.
  • Close the battery compartment, then plug in the power supply and plug the laptop into a power outlet.

Is it possible to keep the laptop turned on all the time?

It is categorically impossible, even when buying it warns about it. You need to charge to full, then plant two times completely. After that, charge as needed, but never keep recharging if it shows 100%. The first laptop (or rather its battery) was ditched by being constantly connected to the network.

Can I use a laptop from the network?

If you play a lot, edit videos or work with graphics, it is recommended to remove the battery from the device. Better to completely transfer it to work from the network. There is only one reason for this: during intensive work, the laptop “heats up”, and the battery along with it.

Is it possible not to turn off the laptop at all?

If you work with a laptop all day and are periodically distracted by other things, there is no point in turning off the laptop. If you don’t want to waste time loading the operating system in the morning, put your laptop into sleep mode. If you use your laptop for several hours a day, there is no point in keeping it turned on all the time.

How to charge laptop battery to 100?

When turning on the laptop, enter the BIOS using the F2 button or another provided in your laptop. In the Advanced tab, we need the Battery Life Cycle Extension parameter. Enabled. enable, charge up to 80%. Disabled. shutdown, charge up to 100%.

How to make a laptop charge up to 80?

How to return a full charge?

  • Open the Start menu and through the All Programs panel find a special utility designed to work with the battery, it is called Samsung Battery Manager.
  • Disconnect charging to 80%, then the battery will be fully charged and the battery life will be extended.

How to wake up laptop battery?

How to restore a laptop battery with your own hands

  • Charge the laptop battery to the maximum (but do not disconnect from the mains yet).
  • Go to Control Panel Power Supply Create a new power plan.
  • Select High Performance and click Next.

A practical example of the work of a screwdriver from a computer power supply

At work there are two screwdrivers, they were purchased and with everyday use the batteries lost their capacity and it is already useless to charge them, they sit down very quickly. We tried to remove the battery to reanimate, it did not work out and had to make a power source and work on it in the workshop. So, we check how the screwdriver will show itself when working from a network with a computer power supply.

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A block from an old computer was taken as a basis. It is 220 volts. They brought out a wire with a connector to insert into a screwdriver. Convenience is that the device has a switch and an indicator. The power reserve is sufficient. 2.5 meter wire.

We will test it at work. Drives screws very well, drills holes.

It took about 1.5 hours to rework the unit. The test showed that the power reserve is sufficient for screwing screws into pine, chipboard. Let’s try to drill a hole. As you can see, everything works. There are no overloads, smoke, etc.

A computer module will work too

Another solution to the problem of powering a screwdriver is to mount it to a computer power supply. This option is applicable to those modules that are equipped with a mechanical trigger. The positive aspect is that the unit is cooled by a cooler and is protected from exaggeration of the load by the built-in special system.

Such an assembly is arranged only with the use of power modules for 300-350 W and a current of 12 volts, at least 16 A. For instruments with a voltage of more than 14 volts, this power supply option does not work.

The user may want to hide an unaesthetic unit in a beautiful case, then it is recommended not to forget to arrange ventilation in it.

How to make the screwdriver work from the mains

How a 12 volt screwdriver was converted to the mains

To make such a device, almost any computer source with a generator on the tl494 microcircuit will do. She has an analogue. This is a k 7500 microcircuit.

A suitable block was found, his generator is made on a tl494 microcircuit. But before proceeding with the alteration, you need to make sure that the unit is working. This requires a 12 volt light bulb and a jumper wire. Each block has such connectors. The red wire is 5 volts, the two black wires are negative wires, and the yellow wire is plus 12 volts.

We connect a car light to a 12 volt mowing line. This will be a kind of load and an indicator indicating that the device is working.

There is one more connector. We need a green wire and a black one. We need to close them in order to turn on the block and make sure that it is working. We will do this using a wire jumper. We connect 220 volts and close the green and black wires. As you can see, the fan spun, the light came on. This suggests that the unit is working and can be redone.

Let’s disassemble the circuit and redo the connection of the tl494 chip, as shown in the diagram in the magazine article Radio, 2009, p. 38. “Computer power supply. charger.” This magazine can be easily downloaded on the Internet. We do not need the whole circuit, but we need a node responsible for connecting the microcircuit. The alteration in our case should be done in the same way as in this part of the circuit. We do to remove all protections from the unit and allow the generator to work, so that the unit works immediately and does not turn off under load.

After the alteration of the circuit’s communications is done, we connect the power cord and connect it. And the power supply should work immediately, and the 12-volt light bulb should light up. All protections are disabled, the generator is allowed to run. After that, all the wires that go to the block are soldered onto a 12 volt mowing line. This is not enough for us to work with a screwdriver, we need to raise the voltage to 16 Volts for a power reserve. At the output of the circuit there is a 16 volt electrolytic filter capacitor. You need to unsolder it and put a capacitor at 25 volts, since we will raise the voltage to 16 volts and the previously installed capacitor will not withstand.

In the power supply circuit, there may be a resistor for other parameters, but you should put a 3 kilo-ohm resistor. It is also necessary to replace the section of the circuits in the block that goes to the 12 volt mowing line. Next, we connect a multimeter to the mowing line while the unit is running and using a variable resistor we increase the voltage to 16 volts. After that, the alteration can be considered almost complete. You need to solder a wire to a 12 volt mowing line, you can bring out indicators, switches.

Valery Odinets
A year ago
And I have a dead professional Hitchi. I tried to power it directly from my own charging. it is SMART, GAD, does not want to! The native charger does not see the proper load, and is cut off. I had to put dead batteries in the buffer at the exit. The result. I endlessly work from the network, then 5 minutes on dead cumulators. Not very mobile, but free. And Hitachi-Pro is a beast, even with swotting.

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Car charger

In search of a solution to the question “is it possible to connect a screwdriver to a charger”, you can stop at charging with a car AK-block. Modules with manually adjustable current, voltage are applicable. The connection is absolutely not complicated. just connect the input channels of the instrument motor with the contacts of the car charger.

220 V circuit

It’s not that hard to do. First of all, you need to find out the voltage and current of the instrument supply and select the desired mode. We are looking in the search for the characteristics of your brand of screwdriver and we get the necessary information. Now we buy a step-down transformer or take it from old electronics and assemble a simple circuit.

Shown is a circuit for switching from 220 volt mains voltage to 12 volt constant.

This way you will be able to power any device that previously served from akb. Such alteration will not negatively affect the service life of the screwdriver, but make sure that the tool does not overheat during prolonged work.

Those who have used a cordless screwdriver have appreciated its convenience. At any time, without getting tangled in the wires, you can crawl into hard-to-reach niches. Until the battery runs out.

This is the first drawback. it needs regular recharging. Sooner or later, batteries will run out of charge cycles.

This is the second drawback. This moment will come the sooner, the cheaper your instrument. Saving money when buying, we most often buy inexpensive Chinese “no-name” devices.

There is nothing wrong with that, but you should be aware that the manufacturer saves as much as you do. Consequently, the most expensive unit (namely, the battery) will be the cheapest when bundled. As a result, we get an excellent tool with a serviceable motor and not a worn gearbox, which does not work due to a poor-quality battery.

There is an option to purchase a new set of batteries, or replace faulty batteries in the unit. However, this is a budget event. The cost is comparable to buying a new screwdriver.

The second option is to use a spare or old battery from the car (if you have one). But the starter battery is heavy, and the use of such a tandem is not very comfortable.

Consider the option with a remote power supply

Using a power supply from a personal computer.
On the radio market for a small cost, you can purchase an old power supply from a personal computer. We need a version of the “AT” format, which had to be turned off with the key after exiting the operating system.

Experienced users remember such system blocks. The advantage of such a power supply is also that it indicates an honest power. If it says 300W, then you can safely remove 15-16 amperes from the 12-volt output (again referring to Ohm’s law). This is enough to power an average screwdriver.

Such blocks have a power button in the kit. Another advantage is the presence of a cooling fan and an advanced overload protection system. If you will hide the power supply in a beautiful case, do not forget to leave a hole for ventilation.

The connection is very simple. Black wire (-), yellow wire (12V).

Limitations. a screwdriver with a supply voltage higher than 14 volts will not work.

Dangerous Device. Neon Mains Testing Screwdriver

Using a car battery charger.
The principle is the same as using a computer power supply. It is necessary to purchase an old charger for the starter batteries. The modern fashion for compact impulse chargers has left analog linear devices with manual control of voltage and charge current behind board. Therefore, such a device can be purchased on the automotive market for a symbolic cost.

It’s good if the voltage can be adjusted smoothly. in this case, your makeshift power supply will fit any screwdriver. Converting it to a power tool is reduced to connecting the input of the electric motor to the power terminals of the charger.

Making a homemade power supply.
If you are familiar with the principles of building electrical circuits, you can make your own power supply. Scheme giving general concepts. in the illustration.

The transformer can be picked up from an old tube TV, or other household appliances. Power 220 volts 250-350W. The main thing is the power supply. the donor should not be pulsed.

The voltage on the secondary winding is 24-30 volts. The secondary winding is made of a wire of the corresponding section. However, if the output winding current is at least 15 amperes (see transformer specification), there is nothing to worry about. After losses on the diode bridge (1-1.5 V on the diode), you will get the required output value.

If you have an electrical engineering education, make the calculation yourself. Or in a practical way: by connecting a 220 volt 100W incandescent lamp as a load, measure the output voltage. If it exceeds the needs of the screwdriver, reduce the number of turns of the secondary winding of the transformer.