To convert the electric screwdriver to work from the mains
Cordless screwdriver. a great helper in the home. The tool together with the master works in the house and in the garden, works in the garage or in the field. Until the battery runs out. The number of charge-discharge cycles in the battery is limited, the battery deteriorates and from idleness: self-discharge destroys the cells. On average, the battery lives 3 years, after which it must be replaced. You can save the tool by converting it into a mains-powered tool. There are various ways to rebuild it.
It is best to buy a device with a second battery included. To avoid unnecessary interruptions, you need to recharge the battery. Some charging stations charge a 1 Ah battery in 10 minutes, and even if it takes 30 minutes, you get a second battery that is barely empty. Pay attention to what is listed as charging time. This can be anywhere from a few minutes to a few hours. Larger batteries with 2, 3 or even 5 Ah take much longer, but are also heavier and more expensive. For batteries, it is worth staying with the manufacturer.
Without batteries, a screwdriver becomes a piece of iron. When batteries stop holding a charge, you have to look for new batteries. First, it is expensive. the price of batteries accounts for up to 80% of the cost of a screwdriver, so it is more efficient to buy a new tool. Second, batteries are not always available, for example if the model is discontinued. Third, the diligent owner strives to take advantage of every opportunity to save money.
Why you need to convert a mains-powered electric screwdriver
In addition, you can also buy machines without a battery. However, suggestions don’t have to be any clearer. So when ordering, look carefully at what’s included and don’t let yourself be blinded by the lush symbol. Then comes the intended deal, perhaps without the case, charger and battery. Also make sure the torque is adjustable. Otherwise, you might drive too deep into the wood. With the right torque, the screwdriver automatically stops when the screw is properly plunged.
Converting a cordless screwdriver to run on mains power is a good option. What it gets:
- The tool gets new life.
- No more need for batteries requiring a charge.
- The torque of the tool is independent of the battery charge.
The disadvantage of the rebuilt design is its dependence on the power outlet and the length of the power cord.
It allows you to handle a large number of screws very quickly and evenly. Also avoid damaging the screw head or bit. Also pay attention to the appropriate bits, especially in the case of cross-slots. It’s also worth investing in bits and screws. In some cases it doesn’t matter, with a wall or fence, screws and bits make the difference between torture and relaxed work.
And, of course, a cordless screwdriver should also play. The right accessories are very important. Some cordless screwdrivers are almost naked. For a reasonable fee, there are practical storage cases, drills, and bits. Don’t let yourself be dazzled by a giant bag of cheap bits. In the long run, it depends on the screwdriver. On the other hand, a thick package of accessories is practical if they want to get started or all together. Also dressing tips are worth the purchase. Especially in the garden, sharp edges or burrs can easily be removed without time-consuming manual work.
Warning! Do not use a converted cordless screwdriver if it is higher than two meters.
Power supply construction options
There are several options for converting a screwdriver to mains power. The task is to power the electric motor of the device with an intermediate source.
Using a laptop charger
To make a power supply of 12 V for a screwdriver with your own hands is possible, even without technical knowledge. It is only necessary to find an unnecessary charger from a laptop, which has specifications similar to those for powering a screwdriver. The main thing is that the output voltage corresponds to what you are looking for (12-14 volts).
To achieve this goal, you must first disassemble the battery and remove the defective elements from there. This is followed by the following manipulation:
- We take the charger from a laptop.
- We cut off the output connector, stripping and tinning of the wire ends.
- Strip wires and solder to battery input wires.
- Insulate the soldering points to avoid short circuits.
- We make a hole in the housing, so as not to squeeze the wire, and assemble the construction.
How does a 18v Makita Battery Tool runs of 230V?
The base. a power supply from a computer
To make this device we need a block from a PC A-format. Т. It’s not hard to find, this is an old model of the power supply, easy to buy at any market for radio parts. It is important to know that you can use a 300-350W unit with current in the supply circuit of 12V not lower than 16A.
It is the AT format units that meet these parameters. On the body of this device there is a power button, which is very convenient when working. Inside there is a cooling fan and an overload protection circuit.
The order of rebuilding the unit:
- Remove the B housing cover. П. Inside we will see a board with a lot of wires going to the connectors, as well as a fan.
- The next step is to disconnect the power protection. Find the green wire on the large square connector.
- Connect this wire with the black wire from the same connector. You can make a jumper from another piece of wire, or you can just cut it short and leave it in the case.
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Then find the smaller connector (MOLEX) in the output bundle and do the following operations with it:
- Leave the black and yellow wire, and cut the other two short.
- To make it easier to position the PSU for work, we solder an extension cord to the black and yellow wires.
- Attach the other end of the extension cord to the contacts of the empty battery compartment. This should be done by soldering, you can make a good twist, and the polarity must be strictly observed.
- Make a hole in the case, so as not to squeeze the wire during assembly. The device is ready.
If you have the desire to spruce up your design, we recommend that you buy it at a surchargeable price. е. Hide it in another case, drill holes for air flow to prevent the PSU from overheating.
Power from the car charger
Having a car battery charger is quite easy to make a device to power a screwdriver. To make the conversion, you only need to connect the power terminals of the battery charger output to the power supply of the electric motor.
If you have a device for charging with continuously variable output voltage, you can use it as a power supply for an 18 volt screwdriver.
What kind of external power supply can be used. an old computer or a laptop charger?
Available power supplies can be used as an external power source:
charger for car batteries; PSU from an old computer; the battery charger from a laptop; homemade PSU.
You can buy an old battery charger in the market inexpensively. Nowadays mostly impulse chargers are used and old devices are often sold out of necessity. This is the charger with the ability to manually adjust the voltage and current is ideal for any electric screwdriver, regardless of its operating voltage. All remodeling consists of connecting the low-voltage cord to the output pins of the charger.
Computer power supply is purchased from older models, it must have a shutdown button. You won’t need one, but this is the “AT” format version you need. At the radio market is selected unit capacity of 300-350 watts, which will ensure the reliable operation of low-power and medium screwdrivers. All technical specifications are indicated on the label on the housing. The unit has a cooling fan and overload protection. To remake a computer PSU with his hands on an external for an electric screwdriver, perform simple operations: disassemble the case, on a large square connector find the green wire and any black, both wires connect to each other, isolate, on another smaller connector remove all wires, leaving a yellow and black, soldered to them, low-voltage cable cord.
To observe the polarity you must know: yellow wire. plus, black. minus. The tool with voltage up to 14 volts works from the computer power supply.
Most laptop chargers have characteristics that allow them to be used as a power source for an electric screwdriver. Chargers with an output voltage of 12 to 19 volts will work. The only changes that need to be made are related to the output plug. It should be cut, stripped the wires and soldered with a cable of the desired length.
Those who know about electrical engineering can make a home-built power supply. Its circuit is fairly simple and includes a step-down transformer, diode rectifier and two capacitors. All parts can be bought or borrowed from old radio equipment. A transformer from a tube TV set with a 24-30V output is just fine. Rectifying diode bridge is a must. Capacitors are used undeficient, from old appliances: one at 0.1 uF and the other electrolytic at 4700 uF.
Attention! It is obligatory to enclose the construction in a casing. To protect against short circuits, fuses must be installed on the input and output.
To power the electric screwdriver from the battery pack to the mains, you need to get to its power contacts. To do this you will need to disassemble the battery box housing. The batteries present in it are removed.
Since the battery contacts remain on the removed batteries, you need to rework the battery to get them back into the housing. For this purpose I cut 2 short pipes from a 20-gauge polypropylene pipe. Their length must correspond to the height of the battery pack removed. It is necessary that the sections fit into the battery housing of the electric screwdriver.
Most likely one of the edges of the tubes will have to be trimmed slightly, as it will rest against the protrusions on the cover.
Next, you need to remove the contact plates from the batteries and move them to the tubes. To ensure that they fit snugly, each tube should be wrapped with duct tape, thus increasing the seating diameter. After that, a cable of a convenient length is soldered to the contacts, and they are finally attached to the tubes.
Now you need to connect the cable from the terminals of the electric screwdriver to the power supply wire. Here it is important to observe the polarity. The plus side of the unit must be connected to the plus terminal, and the minus side to the minus terminal. To be sure, it is better to solder the twist. The insulation can be done with electrical tape or heat shrink.
Next, the contacts with tubes are placed in the battery case. To do this, a side hole is made in it right at the junction with the cover for the entry of the wire. To prevent the tubes with contacts from slipping and falling out, everything is fixed with hot melt glue. To make it safe, you can also apply it to the joints of the body and the lid, so it does not open.
Now when you plug the power supply into the socket, the electric screwdriver can work from the mains for as long as you want without recharging.
How to convert a cordless electric screwdriver to a corded one
How to convert a cordless electric screwdriver to 220 volt mains. Such a conversion is usually necessary after the battery fails. Sometimes it’s easier to do a tool overhaul than to look for a repair.
It’s easier to convert a cordless electric screwdriver to 220 volts if its power was designed for 12 volts. This is due to the fact that a ready-made rectifier with this output voltage is easy to buy in the store. But the power supply at 14 or 18 volts are much rarer.
The principle of converting an electric screwdriver to mains is to connect an additional power supply as an intermediate link between the tool and the mains.
First you need to find out what the current consumption of an electric screwdriver at 12 volts. Typically, this current is 1.2 to 2.5 amps. This is the point at which you need to select the power supply.
Then there are several ways to connect the power supply to the screwdriver. It is most convenient if the size of the unit allows you to put it in the case of the former battery pack. In this case, it is enough to insert the battery into the tool so that it becomes mains. However, before this, you must carefully make the connection of the output contacts of the power supply unit to the output contacts of the battery housing, observing the poles.
If the power supply does not fit into the battery case, it can be placed in the battery compartment of the electric screwdriver itself. In this case, you need to carefully solder the output contacts of the power supply to the input contacts and carefully insulate the soldering points.
And finally, the third option. equip the battery compartment connector that corresponds to the output jack of the purchased power supply and just connect the unit to the screwdriver as necessary.
When converting a cordless electric screwdriver to a corded machine it is important to be aware of electrical safety and not to leave uninsulated pins.
Or, as an additional option, order the online store inexpensive cordless tool, such as Hammer DRL300 Premium, and do not bother to look for the unit.
How to Convert an Electric Screwdriver to Mains Power
How to convert a cordless screwdriver to a cordless electric screwdriver in different ways
The perfect household helper. the cordless screwdriver. Myth tool will be with you everywhere, but it works fine until the battery runs out, but the number of charge cycles it has is limited, even from idling the battery can go bad. Batteries live about three years, not at the end of that time will have to change it. There is an option to save the tool, if you convert it from cordless to mains, there are different methods of such a conversion.
Why remake a cordless screwdriver?
Why redo the screwdriver? When the need arises? If you are reading this article, there is no such person, have already had time to appreciate all the convenience of this tool. Without excessive wiring, do not always use it even in the most inaccessible places until the battery runs out. This is not the first disadvantage of the screwdriver. The cheaper the tool, the faster his battery will deplete the resources of charging cycles. Here’s not the 2nd drawback. It is not necessary to realize that the manufacturer saves just like you, there is nothing unusual in this case. You will learn how to connect single-phase electric motors for 220 volts using washing machine motors as an example. Buying a new battery at a fraction of the cost of buying a screwdriver, but the way out at this point is to convert the screwdriver from cordless to mains power.
There are several ways to convert a cordless screwdriver to a corded screwdriver:
- using a laptop charger;
- Using a power supply from a PC;
- using a car battery;
- Using a power supply from a halogen bulb;
- Using a Chinese 24V power supply board.
How to convert a cordless screwdriver to 220 volt power?
There are a variety of complex ways to convert your cordless screwdriver for mains power. Connecting the battery charger from a laptop requires almost no knowledge for installation of computer power supply you need to be friendly with a soldering iron, and for reconfiguration of the Chinese unit the master must be able to handle measuring tools.
Using a laptop charger
This method requires a minimum of technical knowledge. If there is a need to remake the screwdriver in the network, you can help unnecessary charger from a laptop, as it has similar characteristics and easily found in any home. First you need to see what the output voltage is. The chargers are suitable for 12-19V.
It will be necessary to refine the battery pack, to do this you need to disassemble it and take out the failed batteries.
- Take a laptop charger.
- Cut off the connector and strip the wires of insulation.
- Take the bare wires and solder them. If there is no such a possibility, you can wrap them with duct tape.
- Make a hole in the housing for the wire and assemble the construction.
How to Rebuild an Electric Screwdriver to 220Volt Power Supply
When the batteries do not hold a charge and exhausted their life, and an electric screwdriver is still in good condition
Using an external computer power supply
So you need a “AT” size power supply. It is very likely that you can find it at home, but you can easily buy an old working power adapter at any flea market. Its cost is unlikely to be great. Connected the motor from the old washing machine to the emery through the relay kit, as you can see in the diagram. It is important to remember that a power supply with a capacity of 300-350 W and a current of at least 16 A in a 12 V circuit is suitable.
- Unscrew the case of the power supply. Underneath the case you will see the fan, the board and lots of wires that go from the board to the connectors.
- Remove the turn-on protection. To do this you need to find the green wire on the big square connector.
- Connect the green wire with any black wire from the same connector. For convenience you can cut it shorter and leave it inside the case. Alternatively, you can use a jumper made from a small piece of wire.
- Cut off the unwanted wires, leaving the yellow and black.
- Using a piece of wire as an extension cord so that the power supply can be conveniently located when in use, solder it to the yellow and black wires
- Attach the other end of the wire to the terminals of the empty battery compartment, as in the previous instruction.
Using a car battery
The principle of such conversion is not different from the way with the laptop charger. Thanks to the current trend for compact pulse chargers, linear analog units with manual controls can be purchased at the car market at a very attractive price.
If the voltage on the battery changes smoothly, then it is suitable for absolutely any screwdriver, and the modification of such a tool is made as follows:
- To connect the screwdriver to the car battery, you should use inexpensive wires with a small cross section, car cigarette lighter wires will do.
- On all sides of each of the wires, cut off the so-called “crocodiles”, on the free end strip the wire from the insulation by 2-3 cm.
By picking up a Chinese power supply board
So, we are talking about a power supply unit with an output voltage of 24 V and a maximum current of 9 A. The screwdrivers are often designed for 12V or 18V voltage, so you first have to lower the voltage to an acceptable level.
To change the output voltage, you need to make an improvement in the feedback circuit. The resistor under position R10 is responsible for the output voltage. Let’s see how to make a frame sawmill by example. This is just a rough idea, depending on the parameters required and the selected design it may vary. Its rating is 2320 Ohm. Replace this resistor with a trimmer so that you can change the output voltage of the power supply to suit your needs. The trimmer has a rating of 10 kOhm.
The work process can be divided into several steps:
- Check the power supply you bought to make sure it works. Remove the screws and take the case apart to its base. If the seams are glued, take a flat screwdriver, put it to the joint and tap it with a hammer all around the perimeter.
- Next, you need to use a soldering iron to separate the wires from the board.
- Place the purchased power pack in the place where the battery used to be.
- Solder the power cord to the base of the unit.
- Do not forget the safety precautions when working with wires! Carefully distribute the terminals according to their polarity.
- Solder the wires coming out of the power supply to the terminals of the new battery.
- The next step is to connect the parallel leads. They power the battery when plugged in. Install in the disconnected wire with plus polarity a diode with the power indicated on the case. Be sure to place it between the plug and the battery. It is important not to forget about the negative polarity: the diode is fixed with the minus pole to the output from the motor. By doing this you will protect the battery from overheating.
- Insulate the leads and route them along the body. Reassemble the entire assembly and tighten the bolts.
- Test the equipment by plugging it in.
Interesting to know: if you for some reason could not find the right size and voltage power supply, you can find a way out by incorporating a special plug into the housing of an electric screwdriver. The power pack attaches to the base of the handle on a “pama-mama” basis.
To remake the electric screwdriver is not difficult, if you have even minimal knowledge in electronics and radio engineering.
Powering the screwdriver by itself
Working with a hand tool can also be done in a building where there is no electricity. In such cases, the device is connected to a car battery or any other power source suitable for the operation of the screwdriver.
To connect the car battery you must take the wire with crocodile clips, stripe one end and solder directly to the contacts of the electric motor of the tool. The second end is clamped to the battery terminals, respecting the polarity.
The connection principle of the portable battery is similar to the car battery. Only the wire ends are fitted with copper clamping terminals suitable for attachment.
An electric tool lasts much longer than a cordless tool. That is why you should not throw the screwdriver away if the batteries have run out of power. The handy man can convert his power tool to mains power, thus prolonging its life.