Difference Between A Screwdriver And A Screwdriver

Conversion of a screwdriver from battery to mains supply

Difference Between A Screwdriver And A Screwdriver

  • Battery Disadvantages
  • There is a way out. reworking the screwdriver in the network
  • External power supply
  • Battery case power supply
  • DIY screwdriver alteration
  • Using a power supply from a personal computer
  • Using a car battery charger
  • Making a homemade power supply
  • AC adapter for screwdriver in battery housing
  • We build in a ready-made power supply
  • Homemade power scheme

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.

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 for 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 from a wire of the corresponding section.

However, if the current of the output winding is at least 15 amperes (see the 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. E

If it exceeds the needs of the screwdriver. reduce the number of turns of the secondary winding of the transformer.

DIY screwdriver alteration

Consider the option with a remote power supply.

Using a car battery charger

The principle is the same as with a computer power supply. You need 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.

Battery case power supply

Mobility is preserved, you are limited only by the length of the network cable. The only problem is how to squeeze a sufficiently powerful transformer into a small case.

Remember Ohm’s law again, and understand that a powerful 220 volt electric motor can be compact.

AC adapter for screwdriver in battery housing

If your tool is not too powerful, you can place the power supply in the handle or case from damaged batteries.

Useful options

Various models of impulse screwdrivers and impact wrenches differ from each other not only in technical features, but also in some design features designed to expand the capabilities of the tool and make it the most comfortable to work with.

Here, perhaps, you should start with an electronic circuit for stabilizing the motor speed, which allows you to smooth out jerks during overload surges and more efficiently use the power of the device. Equally useful may be the function of an electromagnetic brake available in some models, which allows you to practically instantly stop the rotation of the spindle after releasing the trigger. Further on the list is an angular nozzle for working in confined places, for example, it is completed with some sets of type 3 in 1.

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In general, the use of such devices, as a rule, leads to an extremely significant decrease in the torque transmitted to the fastener. Almost all battery-powered impulse drivers and impact wrenches have LED illumination of the working area, which greatly facilitates work in poorly lit and hard-to-reach places, and some Makita models have a fluorescent ring near the spindle, which is designed to simplify finding the tool in the dark. By the way, a very useful option is the battery charge level indicator: by checking it before work, you can avoid nasty surprises.

The bit holders provided on the bodies of some screwdrivers are quite comfortable during operation. Taking into account the number of necessary accessories (adapters, bits, socket heads, etc.), models that are sold with a carrying container, where there are proper sockets, have a certain advantage.

Two words about which battery to choose a screwdriver or screwdriver.

Most often, manufacturers of self-powered rotary tools use three types of energy carriers for their configuration: nickel-metal hydride, nickel-cadmium and lithium-ion batteries.

The first ones are characterized as batteries that withstand about five hundred charge cycles and are considered environmentally friendly. 2nd. about a thousand, but the cadmium contained in these batteries is considered harmful to human health. 3rd type. lithium-ion batteries. The choice of manufacturers is justified by the fact that lithium-ion batteries have the highest density of accumulated electrical energy, therefore, with a capacity similar to analogs, they have twice the smallest weight and dimensions.

The second plus of this type of battery is a small percentage of self-discharge.

Our power tool market is ready to offer you a wide selection of models of this kind of tools for both domestic use and production purposes, and our experienced experts will carefully tell you how to choose a good cheap screwdriver or a high-quality and reliable screwdriver.

Note to the master: we take tools for the home workshop

Principle of operation

The main part of the impulse tool is the percussion mechanism, which converts rotational motion into rotational-percussion. Let’s take a closer look at it. Where, with a relatively small power of the drive electric motor, a large torque is taken from and at the same time, there is actually no reactive force?

No miracles, ordinary physics. Let’s look at it in order. The moment is the force multiplied by the length of the lever, in our case, by the distance from the projection of the spindle axis onto the nut to the outer corners of the hexagon, where the force is applied. In turn, the force is determined by the configuration of the impulse of the striker in the wrench and the impact time, which mainly depends on the degree of compliance of the fastener being tightened (or unscrewed). For example, when running along a thread, the resistance is small, because the impact mode does not turn on.

The mass rotating under the action of an electric motor evenly accumulates energy, and then immediately comes into contact with the striker, imparting a significant torque to it, after which, thanks to the special design of the striking mechanism, it begins to rotate freely again.

In this case, the only reactive force working on the tool body is the action of the motor armature, therefore, even when a significant moment is transferred to the working nozzle (socket or bit), the recoil on the device handle is extremely small. The impact energy is almost one hundred percent transferred to the bolt, nut or screw, and since the impact is close to elastic, then virtually all the kinetic energy is spent on the rotation of the fastener.

Depending on the type of percussion mechanism, for each revolution of the spindle, the blow is applied either once (for a massive tool) or twice (for most conventional models) times. There are several options for the design of the unit under consideration, but they all pursue the same goal. to allow the striker to rotate independently of the striker, accumulating energy and then actually simultaneously transferring it to the striker before the process repeats.

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The maximum torque of some impulse wrenches exceeds 1000 Nm, but you need to keep in mind that such results are achieved only when firmly tightening screws or screws of a rather huge diameter, when the resistance to rotation is high and short impacts follow with the highest frequency (up to 3600 per minute ).

We prepare a nut runner

In fact, electric impact drivers and impact wrenches are extremely simple. An engine, a gearbox, a rotary-impact converter and control circuits are hidden in a case made of duralumin alloy or strong plastic. Only the spindle with a square (SQ) section 1/2 ", 3/4" or 1 "or with an internal hexagon (HEX) 1/4" protrudes outside.

The body traditionally has a pistol-like shape, less often it is linear (it is held like an ordinary screwdriver), from time to time with an additional handle (butterfly scheme). The pistol grip can be located at the end of the tool, but from time to time for best weight distribution it is located in the middle of the body. Electric motors of impact wrenches and screwdrivers are both collector and brushless (valve), which have a number of indisputable advantages. they are quieter, do not spark, do not require maintenance and have a significantly longer resource. Such engines increase the operating time on one battery charge by almost a third.

To hold bits and extensions with an annular groove inside the hexagonal holder, a spring ring or a spring-loaded ball is provided on the spindle. they are also equipped with an outer square for end heads of nutrunners. The use of different adapters can be, but it is not necessary, since due to the effect of torsion smoothing, any excess link significantly reduces the maximum tightening torque.

The transmission of rotation from the motor to the spindle in all impact wrenches and screwdrivers is carried out through a reduction gear. perfect is the planetary structure of this unit, which has the smallest dimensions and weight.

But the torque limiting clutch (ratchet), which is a standard part of the design of ordinary screwdrivers, is technically extremely difficult to adapt to work in shock mode, therefore it does not use here. Accordingly, in order to find the achievement of a suitable tightening torque, the user of the tool will need some experience.

History of appearance

The pneumatic tool arose much earlier than the electric one: its history begins in 1897, when the South American engineer George Leiner made a jackhammer. By the way, not long before this, Wilhelm Emil Fine invented the first hand electric drill, adapting the electric motor to an ordinary hand drill. Only half a century later, in 1955, in an electric drill it was possible to combine the percussion and rotational movements: this was done by the Metabo company. Before the advent of impulse wrenches and screwdrivers, there was only one step left, it was only necessary to change the axial impact to tangential.

And in the same 1955, Bosch released its first electric impact wrench, which began to be used with success in tire shops.

What is the difference between a wrench and a screwdriver

Screwdrivers and wrenches, since their inception on the power tool market, have become one of the most needed tools for both professional and domestic use. The popularity of these devices lies in the breadth of their implementation. These tools will find their place both during construction and during repair work and in almost all other options, since screws, screws and nuts have become the most common fastening tools.

The screwdriver is a power tool designed for efficient and quick unscrewing and tightening of bolts, screws, nuts and self-tapping screws.

It is also suitable for drilling holes, as it has a built-in drill and can work as a drill. The electric screwdriver has the ability to precisely set the screw-in depth, so that all screws and screws go into the base at a similar depth or leave it at a pre-set height. The rotational speed of the screwdriver is infinitely adjustable depending on the rate of work and hardness. Another plus is the locking of the tool switch.

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Impact wrench. a tool mainly used in assembly work.

The area of ​​its implementation is very wide. from furniture work to mechanical engineering. For comfortable use, the nutrunners have a fairly low weight, a cooling system, a reliable motor, a reverse function and, for changing nozzles, a quick-release SDS chuck. There is a wide range of different accessories available for impact wrenches: these are different attachments and adapters that make this tool versatile. Choosing an impulse wrench, you need to pay attention to its torque, power, seat size, the presence of reverse, as well as the ability to adjust the applied force.

Wrenches, unlike screwdrivers, make an impact perpendicular to the axis of rotation and radius, due to which, with the same power, much huge moments are achieved when unscrewing and screwing.

As a rule, wrenches do not have a built-in torque adjustment, and external devices (for example, torsion bars) are used for this purpose.

Today, the choice of a screwdriver and an impulse wrench is not particularly difficult, since the construction power tool market is represented by a fairly wide range of models. But in this matter, you can only trust trusted manufacturers, whose professionalism has confirmed their highest qualifications.

Bosch provides quality screwdrivers and impact wrenches for all dry finishing jobs. These are reliable and comfortable professional power tools with the use of innovative technologies based on practice.

Professional power tools. the Bosch screwdriver meets all the requirements for a similar tool.

It is easy and comfortable to use, and its belonging to this trade mark is an indicator of the highest quality.

Bosch screwdrivers stand for reliability, speed, precision and the highest ease of use. The torque and rotation frequency of these professional tools is optimal for any kind of implementation. Bosch screwdrivers provide fast and precise screwing of bolts and screws for interior finishing work, and their comfortable shape ensures tiring work.

Impact wrenches from Bosch are a reliable and successful professional power tool that has the highest impact force, low reactive torque and the highest service life. It provides precise screwing in both single work and serial production.

Impact wrenches, thanks to the highest torques, guarantee the highest productivity in the assembly of racks, cars, etc.

Choosing a screwdriver and impact wrench from a manufacturer such as Bosch, you get a reliable, long-lasting and successful construction power tool that makes it much easier to screw screws, screws and nuts into products from different.

Screwdrivers in most cases are supplied with only a conventional, but massive adapter for attaching nozzles, screwdrivers. an all-purpose three-jaw keyless chuck.

The first type of tool, designed for tightening massive screws and nuts, is often pneumatic or works from the mains, for the second type of tool, which is distinguished by maneuverability, power from batteries is enough. Screwdrivers and wrenches, often used for repairing cars and in mechanical engineering, can be equipped with an impact mechanism. Thanks to its action, a reliable clamping of the threaded connection is ensured with small jerks.

Therefore, with a huge size of stationary work (for example, at car service stations) that require a lot of power from the tool, attention should be paid to power-operated screwdrivers. But in other situations, especially when carrying out work away from electricity, users often prefer tools with autonomous power supply. Lightweight models are not equipped with an impact function, but they have proven themselves perfectly in finishing and repair work, where the main emphasis is not on power, but on maneuverability, versatility and speed of the tool.