How to calculate the power of a screwdriver in watts?

One of the most common tools among craftsmen is a screwdriver. In terms of popularity, it is located, perhaps, immediately behind the drill, although it contains some of its functions. The main purpose of this tool is to screw in self-tapping screws, or more precisely, to screw in screws.

It is necessary to consider the main requirements that must be taken into account when choosing a screwdriver for yourself. They are divided into two main types, as is known, network ones, operating from a 220-volt household network, and rechargeable ones, respectively, operating from a battery. Because networked ones are so widespread, we won’t directly consider them here, but will only say that the automatic selection characteristics are probably becoming vital for networked screwdrivers.

What volts is expected from the screwdriver? The battery voltage of a screwdriver directly affects its power. From school physics courses, everyone knows that power is equal to the product of voltage and current. Hence the conclusion is that the higher the operating voltage of the battery, the higher the power of the device. Of the screwdrivers presented in the trade, the most common battery voltages are 6, 12, 18, 24 and 36 volts. Myth Voltage is always shown by the manufacturer on the product label.

To what extent does a screwdriver require watts? This issue was partly covered in the last paragraph. However, it’s worth summarizing that the stronger the screwdriver, the more comfortable it is to work with a child. With all this, it is worth considering that the battery must match the power of the device. The battery power can be calculated based on the energy consumption of the motor that is built into the screwdriver. If the ratios are incorrect, you can quickly discharge the battery without any problems. It is also necessary to see that the stronger the device and the stronger the power source, the higher the weight and dimensions of the tool. And as a result, the cost of the screwdriver is higher. If we consider the battery power, then it is most likely correct to say not the power, but the battery capacity. It is measured in ampere hours and designated as Ah.

What voltage is better to choose a cordless screwdriver, difference in voltage

When choosing the right screwdriver for a particular task, you should pay attention to various characteristics. Among them, the most important are not only the power of the device and the capacity of its battery, but also the battery voltage, and even the torque value.

When carrying out construction and repair work, a 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 versions of this device - mains and battery-powered, more often the latter option is chosen to perform household tasks.

At the same time, attention is paid to the parameters of the power tool itself and to such characteristics as the voltage in the screwdriver, its power, torque and battery capacity. Each of these indicators is important for evaluating and choosing the correct device. Whereas it’s not worth buying based on suitable power or voltage alone.

Basic parameters of the battery and the tool itself

The main parameter that characterizes the operation of a screwdriver is the battery voltage, which, in turn, determines the power of the electric motor and torque . For household models, the difference in voltage between screwdrivers is small - on average, it is in the range of 10.8–14.4 V. More productive options intended for constant use can be equipped with 24–36 volt batteries.

The battery voltage of a screwdriver also depends on the type of battery - you can answer what the difference is by knowing what metals were used to make it. For nickel-cadmium batteries, large in size with a similar capacity, the value of the indicator is a multiple of 1.2 V (this is exactly the voltage of one element that makes up the battery pack), for lithium-ion batteries - 3.6 V.

Other equally important characteristics include:

• the power of the screwdriver, which can also be used to determine the speed of tightening screws and self-tapping screws. To carry out repairs on your own, models with a performance of 500–700 W are sufficient. A professional repairman will need more powerful equipment - 800–850 W;
• the number of revolutions of the rotating part of the device per unit time. This parameter determines whether the screwdriver can perform the task assigned to it - for example, tighten the required type of fastener. So, for a bolt, self-tapping screw and screw, 500 rpm is enough, for drilling you will need 1200 rpm;
• torque, the value of which can be one of the main answers to the question of what the voltage of the screwdriver battery affects. Using this characteristic, you can determine both the diameter and the length of the screw or self-tapping screw being screwed. Large fasteners, as well as drilling deep and wide holes and hard materials, require significant torque. The maximum value of the indicator is 10–60 Nm.

There are two types of torque for screwdrivers - starting (larger in magnitude and required to put the device into operation) and constant, that is, working.

The parameter value for modern equipment models can be adjusted - you can find out how many modes can be selected for a particular device in the documentation available for it.

Moreover, tools with a pulse mode of operation (turning on the rotating part in jerks) have more screwing capabilities - allowing them to periodically increase the torque, they can screw in a larger screw.

The output torque value of electric motors is not constant and depends, first of all, on the speed of the motor; the higher the speed, the lower the torque on the shaft.

In addition to the voltage of the screwdriver and its power, the battery capacity should also be assessed. The characteristic is measured in ampere-hours or milliamp-hours. The higher the indicator, the longer the screwdriver can work without recharging.

The average battery capacity of a household model is 1300 mAh, which is enough for 2–3 hours of operation. Professional equipment requires more time to complete the work - and a master who uses a screwdriver throughout the whole working day should purchase a model with 1.5–2.0 Ah batteries.

Features of choice

When choosing power, you should take into account not only what power of the screwdriver is indicated in the information from the manufacturer. Due to too much productivity, the device may tighten the screws too tightly, pressing their heads into the surface. As a result, the appearance of the coating deteriorates, and the fasteners, if necessary, are almost impossible to unscrew.

When choosing which voltage is best for a screwdriver, you should take into account that voltage is the main parameter of the device. For example, the motor power of the Makita DDF343SHE screwdriver is 700 W, with a voltage of 14.4 V and a battery capacity of 1300 mAh and a torque of 36 Nm.

Whereas the other model Hammer ACD182 has a weaker engine (22 Nm) and a less capacious battery (1200 mAh) - and it seems that this device is about 40% weaker.

However, due to the 18 V voltage, the Hummer is able to tighten more fasteners without recharging, even being inferior to its competitor in terms of battery capacity.

You can understand why a screwdriver that seems less productive at first glance is inferior to a more powerful one by doing a little calculation:

• the amount of energy stored by the first model is 1.2 x 1.8 = 21.6 Wh;
• the second indicator is only 1.3 x 14.4 = 18.72 Wh, i.e. 15.4% less.

When choosing a screwdriver, it is advisable to take into account the presence of a spare battery included with it. Some models even have 2 additional batteries. On the one hand, such equipment will cost more (especially since the cost of the battery is up to 80% of the price of the equipment), but it will be much more convenient to work with it.

At the same time, an additional battery is not needed to perform household tasks - the time of work performed with its help rarely exceeds 1–2 hours. While in the process of constant use of a screwdriver (for example, for repair work or furniture assembly), the second battery allows you to not interrupt the work for longer than a few minutes.

The discharged battery is charged, and a spare battery is installed in the device.

If there is no need for long-term work, which may require a screwdriver, it is not recommended to buy a model with additional batteries, not only because of its increased cost. It’s just that the service life of such a battery is short, and after a couple of years the user will have to buy a new part without using up even half of the life of the old one.

Summarizing

To summarize the article, it is worth noting that the battery power of a screwdriver, although it is an important parameter when choosing a suitable model, the voltage and capacity indicators are much more important. And most often it is worth paying attention to torque only if it will be used to not only screw in, but also drill.

You should also know that the maximum power of a cordless screwdriver of all commercially available models is a device with a voltage of 36 V, a torque of 60 Nm and a capacity of 3000 mAh. Such equipment is quite difficult and not very convenient to use without professional experience.

Why do you need a screwdriver?

Initially, choose what function this device will perform in your home or work:

• For screwing or unscrewing a variety of fasteners;
• More powerful tightening of a dowel or anchor, insertion of a self-tapping screw, etc.;
• Drilling in soft or hard material;
• Thread cutting;
• Mixing construction mixtures.

Based on the above tasks, study the most relevant technical characteristics and differences of screwdrivers specifically for your needs.

How to determine the power of a screwdriver - All about electricity

Battery screwdrivers are very convenient to use and are widely used by both professionals and home craftsmen. The battery is usually the first to fail. Currently, all manufacturers of power tools have switched to lithium batteries and purchasing a new nickel-cadmium battery for an old screwdriver is becoming more and more problematic, and the prices for these batteries are much higher than for lithium ones.

Of course, it is possible to purchase batteries on various services that sell Chinese goods. But it takes time for the package with the “cans” to arrive, and again, these are certain costs. There is an alternative to buying batteries/cans - connect the screwdriver to the mains power supply and forget about quickly draining the batteries. Powerful power supply on Aliexpress. There are many inconveniences due to the power cord, but you always have to sacrifice something.

How much current does a screwdriver consume?

Before choosing a suitable power supply, you need to understand what current consumption you need to count on. Unfortunately, cordless screwdriver manufacturers do not indicate the current consumed by the motor.

The capacity of the battery itself in ampere-hours, which is necessarily indicated on the battery, does not allow us to understand how much current the screwdriver consumes in operating mode

.

The maximum that the manufacturer can indicate is the power in watts, but this is very rare, usually the power is indicated directly in torque.

If the power in watts is still indicated, we can have an idea of ​​the current consumption and select an appropriate power supply with a small current/power margin. To calculate the current, it is enough to divide the power in watts by the operating voltage of the screwdriver, in this case it is 12 volts. So, if the manufacturer indicated a power of, for example, 200 watts - 200:12 = 16.6 A - this is the current consumed by the screwdriver in operating mode.

However, the indicated power is very rare and there is no universal figure that characterizes all 12-volt screwdrivers. You need to understand that when the motor shaft is fully braked, the currents can significantly exceed the rated ones and calculating this value is not very easy.

At the same time, an analysis of various forums and our own experience has shown that a current of 10 A is often sufficient to operate a screwdriver; this is enough to perform many screwing and drilling functions.

It is known that current surges during complete braking of the shaft can exceed 30 A.

Well, what conclusion can be drawn from all this? A 12 V power supply providing 10 A current is suitable for a screwdriver; if it is possible to use a 20-30 A unit, this is even better. These are average figures that apply to most screwdrivers.

power unit

We will not consider purchasing any units or transformers, and if we do buy it, it will be a new battery! We will consider using what we have on hand. I’ll say right away that the charger from the same screwdriver is only suitable for drilling overripe bananas, its power is too low.

Ideally, a step-down, powerful 12 V transformer, for example from a computer uninterruptible power supply, would be suitable. The power of such a transformer is usually 350-500 watts. But I didn’t have such a transformer, but I had a lot of computer power supplies. I am sure that if someone has various electronic junk, ATX computers are definitely lying around in it.

This is one of the first representatives of computer ATX power supplies.

The computer ATX unit is quite suitable for a screwdriver; the load capacity on the +12 volt bus allows you to remove currents of 10-20 amperes. I would like to dispel a small myth - it will not be possible to stuff the unit into the battery housing of a screwdriver, the ATX board is too large. You will have to make a separate case for the block or leave it in its original metal case. The disadvantage of the original case is sensitivity to dust, and even the smallest repair requires a lot of dust.

A rather weak unit, the load on the +12V bus is only 10 A. If possible, it is better to choose units with a more powerful twelve-volt bus.

Mock Tests

Before starting to build a working structure, you should test everything on the knees, make sure that the screwdriver is operating stable under load and that there is no severe overheating in the power supply.

We take the computer power supply and check it: plug it into the network, find green in the output bundle of wires (they say it can be a different color, but I always came across green ones) and connect it with a jumper to any of the black ones (all black wires at the output are the common output, in our case it is a minus). The unit should turn on and a voltage of 12 volts will appear between the black and yellow wires. You can check this with a multimeter or by connecting any computer cooler to the named terminals.

If everything is in order and the unit produces about 12 volts on the yellow (+) and black (-) terminals, continue. If there is no voltage at the output, we look for another unit or repair this one; this separate topic will be described separately.

We cut off the plug from the output of the block and take 3-4 yellow and black wires coming from the block and connect them in parallel. When cutting off the plug, do not forget about the green starting conductor, it must be shorted to black. We received a 12 V source with a decent current load capacity of 10-20 A, the currents depend on the model and power of the unit.

Now we need to connect our 12 V to the terminals of the screwdriver without a battery; we look at the polarity of the connection using the battery. Well, we check the screwdriver - at idle speed, then slowing down by hand. At this stage, I encountered a problem: when I press the button fully, the screwdriver works, but when I slowly, smoothly press the screwdriver button, the power supply goes into protection. To reset the protection, you must disconnect the unit from the network and turn it on again. This won’t work at all, we need to somehow correct this instability.

I pulled the block board out of the case and additionally hooked up a multimeter to constantly monitor the voltage

In my opinion, this phenomenon may occur due to the fact that the power supply and the screwdriver button are controlled by PWM controllers; due to interference along the power wires, the controllers somehow interfere with each other. We are trying to solve this problem using an improvised LC filter.

I assembled the filter in 5 minutes from what was at hand: 3 electrolytic capacitors of 1000 uF at 16 volts, a non-polar capacitor of less than 1 uF and wound 20 turns of copper wire with a diameter of 2 mm on a ferrite ring from another unit. Here is his diagram:

And this is what he looks like. This is a purely trial version, in the future this design will be transferred to the battery housing of the screwdriver and will be made more accurately.

Well, now you need to remove all the snot and piles of wires, remove the “dead cans” from the battery case, replace them with an LC filter, and test the screwdriver in more realistic conditions.

Assembly of the working structure

For ease of use and connection, I brought the cord from the power supply into the battery case. I took a 3.5 meter long cord that was available. I removed all the battery cells from the battery and installed an LC filter. Now, if I somehow get a working battery, I can always put it on a screwdriver and put the power supply away as a reserve. I didn’t throw the batteries out of the battery, I have an idea where to use them, but that’s a topic for another review.

Since the cord connecting the unit to the screwdriver has a certain resistance and inductance, you can try to close the terminals of the L1 coil with a jumper. In theory, this could increase power by a tiny amount.

The screwdriver feels great with a cord, but to be honest, it seemed a little weak to me when braking by hand. But trial tightening of the self-tapping screws dispelled my doubts: self-tapping screws 35 mm long can easily be screwed into 20 mm plywood. This means that a screwdriver will cover most repair needs.

I cut off all the output wires from the block, leaving the green starting wire; I soldered its end to the common conductor of the board, where all the black ones are soldered. It's best to carefully desolder all the wires, but my soldering iron was too weak for this and had to be cut. I soldered two short, hard copper wires to the common contact and +12 (where the yellow ones are soldered) and connected them through the terminal block to the cord to the Shura.

Assembly of the working structure

For ease of use and connection, I brought the cord from the power supply into the battery case. I took a 3.5 meter long cord that was available. I removed all the battery cells from the battery and installed an LC filter. Now, if I somehow get a working battery, I can always put it on a screwdriver and put the power supply away as a reserve. I didn’t throw the batteries out of the battery, I have an idea where to use them, but that’s a topic for another review.

Since the cord connecting the unit to the screwdriver has a certain resistance and inductance, you can try to close the terminals of the L1 coil with a jumper. In theory, this could increase power by a tiny amount.

Connecting a 12 volt screwdriver to an ATX power supply

Battery screwdrivers are very convenient to use and are widely used by both professionals and home craftsmen. The battery is usually the first to fail. Currently, all manufacturers of power tools have switched to lithium batteries and purchasing a new nickel-cadmium battery for an old screwdriver is becoming more and more problematic, and the prices for these batteries are much higher than for lithium ones.

Of course, it is possible to purchase batteries on various services that sell Chinese goods. But it takes time for the package with the “cans” to arrive, and again, these are certain costs. There is an alternative to buying batteries/cans - connect the screwdriver to the mains power supply and forget about quickly draining the batteries. Powerful power supply on Aliexpress. There are many inconveniences due to the power cord, but you always have to sacrifice something.

See also other articles

Source: https://yserogo.ru/raznoe/shurupovert-bp.html

Few additions

To compensate for losses in the cord connecting the screwdriver to the power supply, it is useful to increase the voltage by 2-3 volts. But this is provided that you know the circuit design of ATX computers and know what to do.

If it is possible to use a powerful transformer, then its output, secondary winding should have an alternating voltage of 12 V. If the voltage is different, it is recommended to adjust the secondary winding by unwinding (if the voltage is more than 12 V) or rewinding (if less than 12 V) several turns. It is worth noting that when rectifying and filtering the 12 V AC voltage, it turns out to be about 14.4 V without load. So don’t let this confuse you, this is the EMF voltage and it is natural that it is higher than the nominal one.

In addition to the transformer, a rectifier is assembled; the diodes should easily hold 30 A. It is more expedient to place the capacitor filter in the battery case, as in the ATX version.

Source: yserogo.ru

Choosing a screwdriver: 13 mistakes to avoid

21.04.2017

Screwing in a screw is one of those tasks that seems to appear out of nowhere, but with enviable consistency. Fixing a lopsided closet door, hanging a mirror in the hallway, attaching a shelf in the bathroom are small everyday problems that need to be solved daily. It is possible to tighten a bolt, screw or self-tapping screw using a screwdriver, but it does not always work. Anyone who has tried it knows: it is a thankless, lengthy task, and the result is often zero. And it needs to be done quickly and efficiently.

Buying an electric screwdriver for everyday household work around the house is the best solution. Not to mention that it is indispensable in the work of professionals. It is used on construction sites, during repairs and in furniture workshops. Using a screwdriver, they install plasterboard structures, install windows and doors, fasten baseboards and assemble furniture.

Choosing a screwdriver based solely on its cost is a grave mistake. They differ in power and various functions. In order not to make a mistake when choosing, you should carefully study its technical characteristics before purchasing. The main ones are rotation speed, torque and type of battery (in a cordless tool). But reading the digital data is half the battle; you also need to be able to figure out what indicators are needed specifically for you and for the planned work.

No need to overestimate: buying a household screwdriver for professional work

The screwdriver can operate from the mains or from the built-in battery. Not only the mobility of the tool, but also its power depends on the type of power supply. A small and convenient cordless tool is the best assistant for a home craftsman. It has all the necessary functions, and it weighs very little, so your hands don't get tired.

But the main disadvantage of a cordless screwdriver - low power - will play a cruel joke on those who plan to use it as a professional tool. That is, a lot and often. For pros, you need a completely different power. The professional price is higher. Most often it is tied to a power outlet, but can withstand intense loads well.

Incorrect battery selection

The battery is the most expensive part of the tool. More than half the price you pay is for the battery. In order not to run every 20-30 minutes with a cordless screwdriver to the outlet for recharging, read the battery data sheet. We recommend that you carefully consider these parameters.

• Voltage (determines power)
• Capacity (affects operating time)
• Memory and self-discharge effects (much better when they are absent)

Buying low-capacity batteries for long-term use

Battery capacity directly affects operating time. The higher the capacity, the longer it can work without recharging. Capacity is measured in ampere-hours and depends on which element is installed inside the battery. Cadmium batteries have the smallest capacity, and lithium-ion batteries have the largest capacity. Therefore, for long-term work, choose a lithium-based screwdriver. It costs 2-3 times more, but provides a guarantee of work for several hours.

Long battery charging time

Charging times vary for different models. A professional tool needs about an hour. Amateur – 5-7 hours. Buying a screwdriver that takes longer to charge than it does to work is a forgivable mistake for a home craftsman. This tool is rarely used. And its long-term recharging does not bring any inconvenience. For the “pros” - a long charging time negates all its work. Charging time depends on the characteristics of the battery and charger.

Buying a single-speed screwdriver for drilling and screwing

A screwdriver is a universal tool. Usually, in addition to “tightening and unscrewing,” he is also capable of drilling. But not all models have this function. Often, a buyer assumes that when purchasing a single-speed tool, it will perform screwdriving and drilling tasks. This is a common mistake. To operate in screwing mode and drilling mode, it must be equipped with a speed controller. Drilling is performed at a different speed than screwing. Working with different materials requires different speeds.

Buying a cordless screwdriver for very rare jobs

If you use a screwdriver once or twice a year, then it is better to buy an electric tool that runs from an outlet. After all, each battery has its own shelf life. It needs to be charged and discharged, if not constantly, then often. Otherwise, it greatly loses capacity. If the storage period is exceeded, the electrolyte stratifies and the metal plates inside are covered with salt.

Wrong selection of battery type

If you make the wrong choice of battery and do not know the specifics of its operation, you will eventually realize that it is not suitable for you at all. Therefore, please note that screwdrivers use three types of batteries:

• nickel-cadmium (Ni-Cd) . Inexpensive. But low-capacity and toxic. They suffer from self-discharge and “memory effect”. It cannot be stored for a long time without charging. And the biggest disadvantage is that you cannot charge a battery that is not fully charged. That is, the possibility of recharging during a smoke break is excluded.
• Nickel-metal hydride (Ni-MH) . Initially developed to replace nickel-cadmium batteries, but due to the same shortcomings they could not take their rightful place in the range of batteries for power tools. More powerful, with the same dimensions, compared to Ni-Cd batteries. The charge cycle varies in the range of 200-300 recharges. The developers have eliminated the problem of the memory effect, so they can be recharged. The only negative is the high degree of self-discharge, compared to other types of batteries.
• lithium-ion (Li-Ion) . Most Popular. Large capacity and power. Do not lose containers in the cold. The number of full recharges is 3000. You can charge at any time without waiting for complete discharge. There is no memory effect. Self-discharge too. But their price is much higher.

The most powerful is not always the best

A powerful screwdriver is needed for long-term work with maximum load. If these are not planned, you should not choose higher power. Powerful has its drawbacks:

• It's heavy. It is inconvenient to work with weight, your hands get tired.
• Large dimensions. You will not be able to work in hard-to-reach places.

For household work, it is better to take a screwdriver that is less powerful, compact, but with good torque.

Buying an impact driver instead of a hammer drill

If it has a shock mode, this does not mean that it will be able to chisel a wall or stone. A screwdriver is not a hammer drill. Runout mode is used for more efficient tightening of bolts and screws.

Technical specifications

In addition to the above differences, each screwdriver should be selected according to a number of technical parameters. To do this, carefully study each of them and decide which one is best for you.

Motor: brushed or brushless

According to the type of motor used to rotate the spindle, all screwdrivers are divided into commutator (brush) and brushless (inverter).

Rice. 3: engine comparison

Look at the picture, here is a fundamental difference - the brush version has graphite brushes for current collection. The main advantage of such an engine is its low cost. The disadvantage is large losses at the point of sliding contact and low efficiency.

Brushless has many more advantages:

• The rotation speed of the drill can be easily adjusted, and in a much wider range;
• Tolerates short-term overloads well;
• The efficiency is 30% higher than the collector version;
• Longer service life before failure;
• Due to the lack of sparking, it can also be used in explosive areas;
• Provides equal speed in both directions and engine speed does not decrease when load is applied to the chuck.

Its main disadvantage is its higher cost, which is why brushless screwdrivers are suitable for professional activities where saving battery power and maintaining basic characteristics during long-term operation are important.

Power

The power parameter for such a construction tool directly determines its ability to drill holes, screw in self-tapping screws, or just disassemble simple structures. As such, the motor power on a screwdriver is determined from the product of voltage and current in the winding. For those connected to the electrical network, the voltage is known in advance - 220 V, these are quite powerful models that can perform any task.

But the battery options are designed for supply voltages of 3, 6, 10, 15, 18 and 36 V. Accordingly, the higher the voltage you choose, the more power you will get from the cordless drill/driver.

Torque

This parameter is measured in Newton meters (Nm). Depending on the torque generated, the screwdriver will be able to tighten loose fasteners or drill wood, metal and other materials. In total, there are three categories of torque among models for domestic use:

• from 30 to 40 Nm – suitable for drilling hard surfaces (wood, brick, metal);
• from 20 to 30 Nm – copes well with screwing screws into various surfaces;
• up to 10 Nm - suitable for repairing interior items, toys, equipment where the screws are already tightened; in everyday life such models are called electric screwdrivers.

Professional screwdrivers can have a torque of up to 130 Nm. But for home use, a force of more than 40 Nm will be unnecessary. Some screwdrivers are equipped with a torque regulator; it is made in the form of a handle with corresponding divisions.

Rice. 4: Effect of torque adjustment on tightening force

Rotation speed and number of speeds

When choosing a rotation speed, they are guided by the following indicators:

• Within 400 - 800 rpm - for unscrewing screws, on most models the rotation speed can be adjusted within smaller limits;
• From 800 to 1300 rpm - intended for drilling holes;
• From 1500 to 3000 rpm - professional, designed for light types of finishing work, can work not only in drill mode, but also in hammer drill mode.

Some screwdrivers may have several rotation options; for this purpose, they are equipped with a speed switch, which will allow you to select the most suitable mode.

Chuck type

According to the type of chuck, all models are divided into: quick-release, key and hexagonal.

Rice. 5. Chuck type

Look at the picture, all types of cartridges are presented here. The key is used for powerful models equipped with an impact mode, as it allows you to securely fix the working element of the screwdriver.

The hex chuck allows you to change bits very quickly, but they are extremely weakly fixed in the socket. Therefore, this option is used only in low-power screwdrivers.

The quick-release chuck is universal because it allows you to quickly change bits and ensure their good fixation.

Operating modes

The main operating mode for a screwdriver is tightening and unscrewing fasteners. But, in addition to the main one, you can find a tool with:

• Impulse – designed to remove a tightly seated or rusted screw from its place;
• By impact - helps to carry out light finishing operations, but cannot fully replace a hammer drill; in most cases it is used for screwing self-tapping screws into hard materials;
• Drilling – allows you to obtain holes of a certain diameter, which corresponds to the diameter of the drill.

Availability of reverse

The reverse button allows you to rotate the screwdriver in the opposite direction. This function helps to work with different thread directions when standard rotation does not help. Also, the presence of reverse allows you to unscrew or loosen fasteners that are already screwed in. This greatly simplifies the disassembly/assembly of furniture, appliances, etc.

Convenience and design

To select a specific screwdriver, it is advisable to hold it in your hands - the handle should fit comfortably in the palm of your hand. This parameter is especially important for professional models, since prolonged work can lead to hand rubbing. If you are going to hold it in one hand, pay attention to the balance - a pistol-type screwdriver would be most suitable.

Illumination of the drilling site - helps to navigate more accurately in poor lighting conditions. Thanks to this function, you will accurately install the drill at the desired point.

Rice. 6: Illumination of the drilling site

The presence of various attachments allows you to work with different types of fasteners. Please note that using the appropriate bit allows you to keep both the self-tapping screw and the replaceable nozzle intact.

Figure 7: What are the different types of attachments for?

What is the Power of a 12 Volt Screwdriver?

How to recycle a cordless screwdriver using various methods

An excellent household assistant is a cordless screwdriver. You will have the myth tool everywhere, alas, it works smoothly until the battery runs out, but the number of charge cycles it has is limited, even from idleness the battery can deteriorate. The batteries last about three years, and after that time you will have to replace it. Of course, you can save the tool if you convert it from a battery to a mains one, and there are different methods for such conversion.

Why remodel a cordless screwdriver?

Why remake a screwdriver? When does such a need arise? If you are reading this article, there is no such person who has already appreciated all the convenience of this tool. Without unnecessary wiring and instantly use it even in the most inaccessible places, until the battery runs out. This is the first drawback of the screwdriver.

The cheaper the tool, the faster its battery will exhaust its charging cycles. Here is the second flaw. And you need to realize that the manufacturer saves exactly like you, and there is nothing unusual here.

Buying a new battery in terms of costs is actually no different from buying a screwdriver, alas, there will be no way out; at the moment, options for converting a screwdriver from battery to mains power will be considered.

There are several methods to convert a screwdriver from a cordless one to a mains one:

• using a laptop charger;
• using a PC power supply;
• using a car battery;
• using a power supply from halogen lamps;
• using a Chinese 24V power supply board.

How to recycle a cordless screwdriver to perform work on a 220 volt network?

Methods for converting a cordless screwdriver to perform work from the mains vary in difficulty. Connecting charging from a laptop requires virtually no knowledge to install a computer power supply

you need to be familiar with a soldering iron; to reconfigure a Chinese unit, the master must be able to handle measuring devices.

Using a laptop charger

This popular rumor method will require you to have technical knowledge like in a movie theater. If you need to recycle a screwdriver into a networked one, an unnecessary laptop charger can help you, because it has identical properties and can be found in every home without much difficulty. First you need to look at the output voltage of the charger. 12-19V chargers are suitable.

You will need to modify the battery pack; for this purpose you need to disassemble it and remove the broken batteries for the car from there.

1. Take a laptop charger.
2. Cut off the connector and strip the wires of insulation.
3. Take the bare wires and solder them. If there is no such ability, tape them with electrical tape.
4. Make a hole in the body for the wire and assemble the structure.

What is the responsibility of a screwdriver? Power

Do you think that the simpler the size and not just W, the better? It turns out differently. I bought it from pila.prom.ua.

We check the power of the Deko GCD12DU3 12V screwdriver

I bought it from the official store: DEKO Official Store. There are only 4 rules of communication on my channel: 1.

Using an external power supply from the computer

What you need is an “AT” format power supply. It is entirely possible that you will find it at home, but there is an option to easily purchase an old working power supply at any radio market. Its price will doubtfully be high. It is important to keep in mind that a power supply with a power of 300–350 W and a current in a 12 V circuit of at least 16 A is suitable.

The alteration steps are as follows:

1. Unscrew the power supply
   . Under the case you can see the fan, the board and a huge number of wires that go from the board to the connectors.
2. It is necessary to remove the power-on protection. For this purpose, you need to find the green wire on the large square connector.
3. Connect the green wire to any black wire from the same connector. For convenience, you can cut it shorter and throw it inside the case. If necessary, use a jumper made from a small piece of wire.

1. Cut off unnecessary wires, leaving yellow and black.
2. Using a piece of wire as an extension cord so that the power supply can be in a comfortable place during operation, solder it to the yellow and black wires
3. We attach the other end of the wire to the terminals of the empty battery compartment, just as in the previous annotation.

Using a car battery

The principle of this modification is no different from the method using charging from a laptop. Thanks to today's trends towards small-sized pulse charging, non-automated linear analog devices are bought on the car market at a very reasonable price.

If the voltage on the battery changes smoothly, then it will fit completely into any screwdriver, and the modification of such a tool is done as follows:

1. To connect a screwdriver to a car battery, you should use cheap wires with a small cross-section; car wires are suitable for lighting.
2. On all sides of each wire, cut off the so-called “crocodiles”, and at the free end, strip the wire of insulation by 2–3 cm.

Taking a Chinese power supply board

What you will need is a power supply with an output voltage of 24 V and a maximum current of 9 A. Screwdrivers are usually designed for a voltage of 12 V or 18 V, so you will first have to reduce the voltage to an applicable level.

To change the output voltage, it is necessary to make modifications to the communication circuit with clients. for the output voltage . Its nominal value is 2320 Ohm. Instead of this resistor, we will install a trimming resistor, this way it will be possible to change the output voltage of the power supply to suit our needs, the value of the trimming resistor is 10 kOhm.

Remove the permanent resistor.

If the battery is faulty: how to make an adapter for a screwdriver?

There are two methods to make an adapter: use an old battery pack , it already has a connector that fits a screwdriver, in other words, connect the wires directly into the handle.

Connecting an old battery pack

Connecting the old unit is done in this way:

The first step is to disassemble the battery pack ; for this purpose, unscrew the screws as shown in the figure.

Connecting wires directly

Connecting the wires directly to the screwdriver is done as follows:

To connect the wires directly, you must first disassemble the screwdriver, in other words, unscrew the bolts holding the two halves of the case together.

Congratulations! Now that you have learned how to recycle a screwdriver online, it is possible to actually apply this knowledge. And it doesn’t matter whether your screwdriver is charged or not. You won’t have to think about the problem of running out of battery. Fortunes are in the works for you!

Source: https://vdiweb.ru/kakaja-moshhnost-u-shurupoverta-12-volt/

Battery or mains

Having decided on the class, you will need to decide whether you need a corded screwdriver or a cordless one. The disadvantages and advantages of both are obvious: the battery-powered one has higher mobility and the cord does not interfere with operation, but it weighs more. The network connection does not depend on the presence of battery charge, but not all construction sites have power supply. In general, the choice is not easy. The decisive point may be that a cordless screwdriver with a good battery costs significantly more than a similar model operating from the mains. The difference is due to the presence of a battery - good options are not cheap.

For a corded screwdriver, the length of the cord is important

If you decide to choose a corded screwdriver, pay attention to the cable length. The longer it is, the more convenient it will be to work - you won’t have to carry a carrier either.

To choose the right cordless screwdriver, you need to pay attention to the type of battery. The duration of operation on one charge, as well as the order of storage, depend on this.

The cheapest type of battery is nickel-cadmium, but they have a “charge memory”

So, if you choose a cordless screwdriver for periodic work, a nickel-cadmium battery will do just fine. If you use it carefully, it will last a long time. If you are starting large-scale work, it is better to use other batteries - there will be less downtime, the work will move faster.