In order to make an impact screwdriver from a starter with your own hands, you will need:
* Angle grinder, cutting wheel, safety glasses, gloves
* Bench vice
* Faulty car starter
* Old socket wrench
* Metal pipe diameter equal to the diameter of the bendix
* Metal lathe, through cutter
* A pair of small springs
* Metal washer
* Welding machine, welding mask, leggings
* Drilling machine, metal drill with a diameter of 5 mm
* Tap with M6 thread
* Kern
* Bolt M6
* Boring cutter
* Small hammer
* Masking tape
* A can of hammer paint
Step one.
The first step is to disassemble the faulty starter from the car, only two parts are needed from it,
this is the armature of the electric motor and the bendix, on which the principle of unscrewing will be based. You can purchase a non-working starter at a metal acceptance shop, for which they will ask for pennies compared to buying a factory-made version of an impact screwdriver.
You need to remove the rod from the anchor itself; this can be done using a press or a powerful bench vice. You can also knock out the anchor with hammer blows, but in this case there is a risk of deforming it, so I do not recommend this method. So, we clamp the anchor in a vice and squeeze out the rod; after it has completely come out, we move on to the next step.
Step two.
Now you need a part with splines from the Bendix; it can be sawed off using an angle grinder with a cutting disc installed, and then modified on lathe before the right size. When working with an angle grinder, be careful; you must hold the power tool firmly in your hands, and do not forget about safety glasses and gloves. The splined part will subsequently fit onto the shaft and transfer rotation to it from the impact.
Step three.
In order to be able to install various heads on this screwdriver, you need to cut off the tetrahedral part from the driver using an angle grinder.
The base of the screwdriver was a round metal blank, in which a step was made for installing the splined part from the Bendix using a lathe and a boring cutter.
If you do not have a lathe, then the base can be made from a pipe of a suitable diameter, preferably with a wall thickness of at least 2 mm. This is what the assembled tool will look like.
Step four.
To fix the rod, clamp the base in a vice and use drilling machine drill a hole with a diameter of 5 mm for the bolt.
Next, we clamp the part in a vice on a workbench and, using a tap, cut a thread for an M6 bolt; during the threading process, we add a special lubricant that will reduce the wear of the tap.
After this, we check how the bolt is screwed in by hand.
Milling needs to be done on the rod itself, since milling machine no, we tighten the part in a vice and use an angle grinder to make a small groove that will prevent the rod from falling out freely.
Step five.
It's time welding work. We install the splined part into the base and fix it in a vice, then using welding machine We weld the parts together. When working with a welding machine, use personal protective equipment, a welding mask and leggings.
After this, we tap the seam to remove any slag formed during the welding process.
Let the part cool slightly, then clamp it into the three-jaw chuck of the lathe and remove weld marks using a through cutter.
The result is a foundation like this.
Step six.
We clamp the rod with the tetrahedron on it in a vice and use a welding machine to weld them to each other, then we tap the slag with a hammer and remove the irregularities on a lathe weld.
As it turned out, during the testing process it was revealed that the shaft, when hit by a hammer, wedged slightly at the base, the springs in this case They couldn't push him back out. This problem was solved by installing an additional thick washer, which was welded close to the splines and then turned on a lathe.
We assemble all the parts into a single structure, then proceed to painting it.
Using a can of hammer paint we transform our homemade instrument, the tetrahedron and spline part are glued in advance masking tape.
After the paint has dried, we get such a very nice impact screwdriver, all that remains is to install a ball with a spring to fix the attachments, and replace the regular bolt with a bolt with a countersunk head.
Step seven.
The homemade tool is completely ready, now you can test it in real conditions. It is convenient for them to unscrew the long bolts on the generator, starter, which are screwed into the aluminum block; after a while, the threads turn sour and unscrewing them with a regular screwdriver is considered almost impossible, but with the help of an impact screwdriver such bolts can be unscrewed once or twice. We strongly tighten the bolts with a wrench that we want to unscrew, thereby simulating a rusted or soured threaded connection.
There is a humorous saying: “A screw driven in with a hammer holds tighter than a nail driven in with a screwdriver.” Many home craftsmen have tried to combine the impact force of a hammer and the torque of a screwdriver.
This usually ended in tool failure. Finally, the impact screwdriver was invented, in which the impact force is correctly converted into torque.
Actually, the principle of operation of an impact screwdriver is similar to the operation of a bolt. The mechanic holds the handle in one hand and strikes the end with a hammer with the other.
There are two main types of power screwdrivers that work on the chisel principle:
Percussion.
This is a modified bolt. Only the main purpose, not working as a jackhammer - but still loosening and tightening screws.
Distinctive feature tool - the tip of the screwdriver passes through the entire length, from the working slots to the heel of the handle. Moreover, it is monolithic; no joints or welding joints are allowed. Of course, only high-quality alloy steel is used to manufacture such tools.
To realize the full potential of the screwdriver, the tip is shaped like a hexagon. There may also be a square or hex key on the heel of the handle. Of course - he is one with the sting.
How to use an impact screwdriver? For greater efficiency, it is better to work together. The splined part is installed on a screw that can be unscrewed (tightened), a key is put on the hexagon, and at the same time, frequent short blows are applied to the rear part with a twisting force.
An assistant should use the hammer, being careful not to hit the hand of the main worker.
Soured screws recoil due to vibration and are easily unscrewed. However direct conversion impact forces in torque, this type of screwdriver cannot provide. Tapping the handle with a hammer only helps to unscrew or tighten a “heavy” screw.
Important! Many would-be craftsmen use impact screwdrivers as bolts. It is unacceptable.
Firstly, - for these purposes there is a specialized tool, more durable and massive. In addition, a real bolt has hand protection in the form of a rubberized fungus. If the hammer comes off the heel of the impact driver handle, you can seriously injure your hand.
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Secondly, – when using a screwdriver as an impact tool, it will very soon be hopelessly damaged. And the cost of such equipment is much higher than a simple bolt.
There is also a simpler version of the impact screwdriver, familiar to you from Soviet times. The monolithic body with two wooden plates ensures reliable transmission of force to large screws. If you couldn’t resist and used a screwdriver as a chisel, you can always restore the splines using a file.
Impact-rotary.
In this rather complicated mechanical tool two force components are combined: an impact on the end part, in addition to direct impact, is converted into torque.
The operating principle resembles impact drill. The spline part, with a sufficiently strong turning force, is affected by vibration from tapping with a hammer.
Important! This screwdriver can be used alone.
This saves time and health. The likelihood that you will hit your own fingers tends to zero.
The impact rotary screwdriver mechanism is located inside the handle.
It is a gimlet with a small angle of twist relative to the axis. Rather, it is a gear with oblique teeth. It is acted upon by a ratchet clip. When striking the heel of the handle, the cage moves forward, and the gear rotates in the direction selected by the switch.
As a result, on working attachment two forces are transmitted - rotating and translational. They act synchronously.
Design advantage – efficient use impact forces, tool versatility. The advantages include less force with which hammer blows are applied.
Flaw– the structure is not monolithic, so the force must be measured. The mechanical part is subject to wear.
And of course – the price. Such devices are quite expensive (we are not talking about Chinese and Polish disposable fakes).
What materials are impact screwdriver handles made from?
Lever impact screwdriver serves both as a handle and as a housing for the mechanism. In addition to structural strength (it is necessary to hold the mechanical part), the handle also serves as protection for the master’s hands.
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Steel body-handles.
This tool is classified as professional. The durable steel housing also serves as a housing for the rotation mechanism. The absence of extra layers on the handle allows you to place the screwdriver in hard to reach places. The one-piece design provides precise force dosing and excellent process control.
Such tools are usually supplied in the form of sets with various attachments. All the same, the design is not monolithic, and therefore it can be supplemented with a universal cartridge for standard bits.
Only when purchasing additional attachments should you remember the increased loads and not skimp on quality.
Component handles
The body of the screwdriver mechanism is covered with a rubberized shell. The material can be different - polyurethane, rigid polyethylene. The main thing is to ensure shock damping and a firm grip in the hand. In the heel part of the handle, a ridge in the form of a fungus is usually made. Just like on a bolt - it gives additional protection hands in case of an inaccurate hit with a hammer.
The soft handle cannot be part of the mechanism, the load is too great. Therefore, the issue of the size of the power unit (and therefore the safety margin) arises acutely. If the mechanical part is left powerful and dimensional, as in products with a steel handle - general dimensions screwdrivers will not allow you to work in cramped conditions.
Reducing the size reduces the strength of the tool, but makes it more convenient.
You can always choose an option that meets your needs.
Using an impact screwdriver.
At first glance, it may seem that the tool serves as a replacement for a screwdriver. These tools cannot perform each other's functions. An impact screwdriver is used either for final tightening of a screw connection with great force, or for “breaking” soured threads.
Important! For high-quality tightening, and especially breaking the thread, there is no need to hit the handle hard with a hammer. Even tapping with short, precise strokes is much more effective.
DIY impact screwdriver
Despite the complexity of the design, such a tool can be made with your own hands. Of course, there is no need to machine a gimlet gear on a CNC router. Spare parts are available at any car dismantling center. The starter mechanism is ideal for this purpose.
There is a humorous saying: “A screw driven in with a hammer holds tighter than a nail driven in with a screwdriver.” Many home craftsmen have tried to combine the impact force of a hammer and the torque of a screwdriver.
This usually ended in tool failure. Finally, the impact screwdriver was invented, in which the impact force is correctly converted into torque.
Actually, the principle of operation of an impact screwdriver is similar to the operation of a bolt. The mechanic holds the handle in one hand and strikes the end with a hammer with the other.
There are two main types of power screwdrivers that work on the chisel principle:
Percussion.
This is a modified bolt. Only the main purpose, not working as a jackhammer - but still loosening and tightening screws.
A distinctive feature of the tool is that the blade of the screwdriver runs across the entire length, from the working slots to the heel of the handle. Moreover, it is monolithic; no joints or welding joints are allowed. Of course, only high-quality alloy steel is used to manufacture such tools.
To realize the full potential of the screwdriver, the tip is shaped like a hexagon. There may also be a square or hex key on the heel of the handle. Of course - he is one with the sting.
How to use an impact screwdriver? For greater efficiency, it is better to work together. The splined part is installed on a screw that can be unscrewed (tightened), a key is put on the hexagon, and at the same time, frequent short blows are applied to the rear part with a twisting force.
An assistant should use the hammer, being careful not to hit the hand of the main worker.
Soured screws recoil due to vibration and are easily unscrewed. However, this type of screwdriver cannot provide a direct conversion of impact force into torque. Tapping the handle with a hammer only helps to unscrew or tighten a “heavy” screw.
Important! Many would-be craftsmen use impact screwdrivers as bolts. It is unacceptable.
Firstly
, - for these purposes there is a specialized tool, more durable and massive. In addition, a real bolt has hand protection in the form of a rubberized fungus. If the hammer comes off the heel of the impact driver handle, you can seriously injure your hand.
Secondly
, – when using a screwdriver as an impact tool, it will very soon be hopelessly damaged. And the cost of such equipment is much higher than a simple bolt. 
There is also a simpler version of the impact screwdriver, familiar to you from Soviet times. The monolithic body with two wooden plates ensures reliable transmission of force to large screws. If you couldn’t resist and used a screwdriver as a chisel, you can always restore the splines using a file.
Impact-rotary.
This rather complex mechanical tool combines two power components: a blow to the end part, in addition to direct impact, is converted into torque.
The operating principle is similar to an impact drill. The spline part, with a sufficiently strong turning force, is affected by vibration from tapping with a hammer.
Important! This screwdriver can be used alone.
This saves time and health. The likelihood that you will hit your own fingers tends to zero.
The impact rotary screwdriver mechanism is located inside the handle.
It is a gimlet with a small angle of twist relative to the axis. Rather, it is a gear with oblique teeth. It is acted upon by a ratchet clip. When striking the heel of the handle, the cage moves forward, and the gear rotates in the direction selected by the switch.
As a result, two forces are transmitted to the working nozzle - rotating and translational. They act synchronously.
The advantage of the design is the effective use of impact force and the versatility of the tool. The advantages include less force with which hammer blows are applied.
The disadvantage is that the structure is not monolithic, so the effort must be measured. The mechanical part is subject to wear.
And of course – the price. Such devices are quite expensive (we are not talking about Chinese and Polish disposable fakes).
What materials are impact screwdriver handles made from?
The handle of an impact driver serves both as a handle and as a housing for the mechanism. In addition to structural strength (it is necessary to hold the mechanical part), the handle also serves as protection for the master’s hands.
Steel body-handles.
This tool is classified as professional. The durable steel housing also serves as a housing for the rotation mechanism. The absence of extra layers on the handle allows you to place the screwdriver in hard-to-reach places. The one-piece design provides precise force dosing and excellent process control.
Such tools are usually supplied in the form of sets with various attachments. All the same, the design is not monolithic, and therefore it can be supplemented with a universal cartridge for standard bits.
Only when purchasing additional attachments should you remember the increased loads and not skimp on quality.
Component handles
The body of the screwdriver mechanism is covered with a rubberized shell. The material can be different - polyurethane, rigid polyethylene. The main thing is to ensure shock damping and a firm grip in the hand. In the heel part of the handle, a ridge in the form of a fungus is usually made. As with a bolt, this provides additional protection for the hand in case of an inaccurate hit with a hammer.
The soft handle cannot be part of the mechanism, the load is too great. Therefore, the issue of the size of the power unit (and therefore the safety margin) arises acutely. If the mechanical part is left powerful and large, as in products with a steel handle, the overall dimensions of the screwdriver will not allow working in cramped conditions.
Reducing the size reduces the strength of the tool, but makes it more convenient.
You can always choose an option that meets your needs.
Using an impact screwdriver.
At first glance, it may seem that the tool serves as a replacement for a screwdriver. These tools cannot perform each other's functions. The impact screwdriver is used either for final tightening screw connection with great force, or to “break” the soured thread.
Important! For high-quality tightening, and especially breaking the thread, there is no need to hit the handle hard with a hammer. Even tapping with short, precise strokes is much more effective.
DIY impact screwdriver
Despite the complexity of the design, such a tool can be made with your own hands. Of course, there is no need to machine a gimlet gear on a CNC router. Spare parts are available at any car dismantling center. The starter mechanism is ideal for this purpose.
The rotor with windings is cut off from the shaft.
The remaining shaft and bushing will serve as the basis of the mechanism. We grind a square on the sleeve for replacement heads.
We make a handle from a piece of pipe, and a striking heel from a powerful bolt.
After welding the structure together, the finished tool was obtained.
It may not be as presentable as a factory one, but the cost tends to zero. And the reliability is beyond doubt.
» Impact screwdriver and invaluable tool benefits
Corrosion is one of the most adverse consequences to which all metal materials, including fastening elements. Often in the process of unscrewing bolts, screws or screws, you have to face the fact that these elements simply cannot be moved from their place. In order not to damage the tool used to unscrew the fastener, you need to choose the appropriate approach. A regular screwdriver is not able to deal with rusted or stuck joints, so the only option left is to use an impact screwdriver.
Features of the functioning of impact screwdrivers
The tool discussed in the material also has a name such as an impact screwdriver. It is a product equipped with a core monolithic type. The main difference between this device and a regular screwdriver is the reinforced metal body, which is resistant to hammer blows. Only high-quality alloy steel is used to manufacture impact screwdrivers.
Before you find out how the tool works, you should understand design features. The tip of the product runs through the entire length of the structure from the working slots to the heel of the handle. The rotation of the tip is carried out due to the splines, which are set in motion with each blow of the hammer. The impact-rotating mechanism is located in the handle of the product. The tip is connected to a helical gear. The handle in the form of a clip has teeth of a similar design. The hammer blows are applied directly to the heel, located on the back of the device. The tool is used not only for unscrewing oxidized or rusted fasteners, but also for checking their screwing.
Design diagram of an impact screwdriver
The operating principle of impact-type screwdrivers is that when you hit the handle with a hammer, the clip moves. Through this movement, torque is transmitted to the sting through a gear train. Each time the hammer strikes the heel, the tip moves slightly, just enough to weaken the joint force. After loosening this connection, you can use a regular screwdriver to completely unscrew the hardware element.
The device does not have any complex elements, so it is very convenient to unscrew fasteners that cannot be unscrewed with standard tools. Their advantage is not only the gradual movement of the sting when striking the handle, but also the inability to lick off the head of the fastener.
The design of the device from the times of the USSR
Technical Parameters of Impact Screwdriver
Each manufacturer strives to make their product not only high-quality, but also multifunctional. Impact screwdriver, depending on technical features and configuration, is determined by the following characteristics:
- Reverse. Good tool will definitely have a reversible design. This function is not always needed, which is why they are absent on products from the USSR era. The presence of reverse affects the cost of the tool, but is not always justified by necessity
- Material of manufacture. Products from the times of the USSR were made of steel, and in this form they went on sale. Modern models rarely found without a surface coating, which is polyurethane, rubber or polyethylene. The presence of a coating on the metal base not only provides additional protection for the tool, but also eliminates the possibility of slipping and damage. electric shock when working with electrical devices
- Lever. The role of the handle in a conventional tool is to apply physical force. In an impact screwdriver, the role of the handle is slightly different - it is integral part impact-rotating mechanism, and is also intended to hold the product during work
This is interesting! Every home craftsman has encountered a situation where a fastening connection cannot be unscrewed. This situation is usually familiar to car owners when rusty bolt The door awning fasteners cannot be unscrewed. For such purposes, a special bit is put on the impact screwdriver, which performs the corresponding actions.
Bolt removal tool
Impact rotary devices are supplied with several options for replacement bits. Moreover, manufacturers equip their tools not only with Phillips and flat bits, but also with hexagons and an asterisk. Bits with different diameters do not have to be included in the set with the product, since ordinary bits from standard screwdrivers are suitable for such a screwdriver.
What are percussion instruments for? Everyone can answer this question independently as soon as they use the product. These tools will always come in handy if you have them in your arsenal. home handyman. If there is an urgent need to use a tool, but have not yet had time to buy it, then for this there is the possibility of making an impact screwdriver with your own hands.
How to make an impact screwdriver with your own hands
Many people probably already have a homemade impact screwdriver in their arsenal of tools. You can do it yourself without much effort. To make a homemade product you will need only one part - a mechanism car starter.
It is this mechanism that is best suited for the manufacture of such a tool. The process of making a tool with your own hands in the form step by step instructions described below:
Now percussion instrument ready for use. As you can see, making it with your own hands is not difficult. Disadvantage homemade device is an unpresentable appearance, as well as the lack of reverse.
Using the tool and how to use it correctly
Before using the device, it is necessary to pre-treat the fastening joint with brake fluid, solvent or WD-40. These liquids corrode rust, so their use will not only make the unscrewing process easier, but also speed it up.
After this, a percussion instrument is taken, into which it is installed required type and bit diameter. The tool should be positioned exclusively parallel to the leg of the hardware. Light blows are made with a hammer on the end of the device, holding it in one hand, and holding the device by the handle with the other.
Operation of the device
To increase the effectiveness of your actions, you need to hold the tool tightly. As soon as the fastening of the hardware begins to loosen, continue striking the tool until the hardware is unscrewed with a regular screwdriver.
The effectiveness of the work performed also depends on the quality of the tool. Cheap options are aimed only at unscrewing small hardware products, so when choosing, be sure to focus on which fasteners you plan to unscrew.
When working with a tool, it is important to follow the safety rules:
- Work is performed with gloves
- Using a hammer weighing up to 0.5 kg
- The blows are applied easily, as this is enough to set the hardware product in motion. If you miss and the blow lands on a finger or hand, the master will receive a minor injury
Advantages and disadvantages
Having analyzed a tool such as an impact screwdriver, you should note all its advantages and disadvantages. Based on these criteria, appropriate conclusions can be drawn about the benefits and necessity of such a device.
An impact screwdriver is the best assistant for a car mechanic.
The advantages of impact devices include:
- Instead of a butt physical strength in the form of turning the handle of a screwdriver, impact energy is used, which is tens of times more effective than a conventional product
- High speed of unscrewing fasteners
- No need to drill out hardware that cannot be unscrewed
Among the disadvantages of an impact screwdriver, the following factors can be noted:
- Although the tool is designed to be impacted, this will shorten its service life. The harder the hammer hits, the higher the likelihood of breaking the reciprocating mechanism.
- Wear. Depending on the quality of steel used for the production of the device in question, the service life will differ
If you are planning to purchase an impact screwdriver that will definitely not lie idle, then you need to know that the cost of an average quality set starts from 3,000 rubles. The tool in question is also sold separately without bits, and its cost in this case starts from 1000 rubles. In the video below you can familiarize yourself with the design of a Chinese impact screwdriver, as well as the operating features of the tool.