How does a reverse hammer work? Making a reverse hammer and do-it-yourself body repair. What is a reverse hammer

Reverse hammer- This necessary tool, with which you can fix dents in hard to reach places car body. These are parts of the car where it is impossible to squeeze out a dent from reverse side.

These mainly include the arches, sills and pillars of the car. Such equipment is used for minor damage to a specific area, which does not require replacement of the entire fragment.

This tool is not complex equipment and is not large in size. It is the reverse hammer that will be discussed in this article.

Classmates

What kind of device is this

If you are at least a little familiar with plumbing, then creating such a tool at home will be quite simple for you.

Making such a device yourself will not take much time, and will not even require special equipment or knowledge. For a clearer understanding, we present primitive drawing, which will not be superfluous.

As noted above, the design of such a hammer is very simple. A metal sleeve is mounted on a steel rod 50 cm long with a diameter of 10 to 20 mm, which should be easy to grip by hand.

The diameter of its hole should allow it to slide freely along the hammer rod without creating a large backlash. A handle is installed on the top to hold the tool by hand. An impact washer is tightly attached to the rod in front of the handle.

Another safety washer is attached at the bottom, which prevents the bushing from flying off the rod during operation, thereby causing additional damage to the leveled surface. And at the very tip of the tool there should be a hook for grabbing staples.

If you decide to make such a hammer yourself, rather than buy it in a store, where the price will be much higher, then it is advisable that the hook and bottom washer be removable. Because for convenience when working, it is better to have a set of hooks of different lengths, as well as several bushings of different weights.

How to use

The operating principle of the reverse hammer is as follows:

First of all, you should inspect the damaged area of the car, select the appropriate hook based on the location and main dimensions of the dent, in order to then correctly calculate the accuracy of the applied force.
Then the repaired area of the body surface must be thoroughly cleaned from excess paint layer and primer down to the metal.
Next, you need to weld on metal surface dents special repair brackets (washers) using welding machine. If the electric spotter comes complete with a reverse hammer, then during the leveling process you only need to change the nozzle.
Then you need to hook the hook of the auto tool onto the brackets, and then begin to pull out the dent with gentle and light blows.
It is recommended to perform leveling until the damaged part of the body surface is completely eliminated.
To get rid of dents on your car, you first need to weld some brackets and push a hammer through their holes to remove the damage.
After which the corrected surface defect should be treated with a primer and again coated with paint to match the body.

Good to know: reverse hammer for bodywork is one of the most important tools designed to remove bumps in hard-to-reach areas of the car.

However, it is worth paying attention to the fact that such a device has its drawbacks, due to which, along with the dent on the car body, a layer of paint that was not even damaged is completely removed. In addition, areas of extensive dents in the hood, roof and surface of the trunk of a car cannot be straightened with its help. Welding staples can greatly deform the metal, which will ultimately lead to a complete replacement of the part.

Vacuum device

I would like to add special kind The described device is a vacuum return hammer.

It is interesting to know that vacuum body straightening has characteristic feature, which makes it possible to repair a considerable area of the damaged surface of the car.

The advantage of this reverse hammer is the vacuum suction cup, with which you will not need to remove the thickness of the paintwork from the car before starting body repair. When working with a reverse vacuum hammer, there is no need to drill or weld brackets onto the area of the body to be leveled.

In this case, caps of any shape and configuration are used. Using a vacuum suction cup, the material is held firmly while leveling out the dent. Working with such a tool reduces labor costs and production time.

Restoring the body using vacuum straightening occurs in several stages:

Cleaning the surface from grease and warming up the area for leveling.
Two specially selected glue pins are glued in the center and along the edges of the dent.
The piston is hooked with a vacuum hammer, gently acting on the leveled area.
Repeating the two previous steps until the surface takes the desired shape.
Thoroughly modify the leveled surface with a mini-lifter, which is sold in a set with pistons.

Take note: To level out unevenness in difficult places, hooks of the same shape and different lengths are used, allowing you to eliminate the defect in the most different parts car body surfaces.

However, vacuum extraction of dents is also not without its drawbacks, namely that it does not completely eliminate the defect. In addition, if the damaged areas of the car have cracks, then such straightening can damage it more. Therefore it is worth great attention consider the method of carrying out body repairs and the selection of appropriate tools.

However, when performing auto body repair work to remove dents in difficult places where there is no access from inside the car, only a reverse hammer will help you. Such reliable tool To level out dents, every car mechanic who repairs cars should have one.

How to make a reverse hammer from scrap materials, see next video:

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Correcting car body defects is not complete without the use of special tools. In particular, a vacuum return hammer or modifications thereof are required. The types are different, some models are created. What it is and how to make a tool with your own hands is described in this article.

What is a straightening hammer and what is it used for?

Not all parts of the body can be repaired with outside. For sills, pillars and arches, a reverse hammer for a spotter - a welding machine - will come in handy. The device is a pistol-shaped design with a retractable electrode and an impact blank. Automation operates without the participation of the master’s hands, only operating the keys of the device.

A typical hand straightening hammer consists of a steel rod with a hook on one side and a steel washer on the other. The operating principle is simple:

The handle and weight - steel washer - are the moving elements of the hammer.
The place for straightening and repair is initially prepared for the procedure. The hook at the end of the hammer is firmly installed in the defect areas on auxiliary washers.
By sharply moving the weight towards the handle of the hammer and making strong blows, the dent is straightened.

Using hammer models, they not only straighten dents, but also use them as a puller. For example, if you have to separate lapped parts, a return hammer for bearings is indispensable.

Any body work requires detailed consideration, otherwise using a hammer will do a disservice by creating new dents. They use the tool independently only when they have the appropriate skill.

Types of straightening hammer

The locksmith industry offers several tool options. For example:

Reverse hammer with pneumatics. The mechanism increases the impact force, making the result satisfactory without long work.
. As described above, this is a welding machine necessary for cauterizing metal and relieving stress from it. A reverse action hammer with it makes the job complete.
A set of 2–3 weights. A large number of weights contributes to the accuracy and force of impact. Dignity in . The straightening hammer is created according to this principle and is being improved.
Vacuum. Hammer, most gentle paint coating car - it does not need to be removed from damaged areas. It is a reverse hammer with a suction cup. Straightens out dents with strong air compression.

Accordingly, models and prices. It is easy to assume that the last option is the most expensive.

How to make a hammer model yourself

Simple kettlebell model available for self-assembly. It is quite possible to make a more modern reverse hammer for body repair with your own hands if you purchase components. Let's consider one of the options, which will require the following materials:

Steel rod. With a cross-section of at least 2 cm. If you do not take this into account, the thin rod will not last long - enough for one straightening.
Rubber handle. It is specially machined from a single piece or an attachment from something is used.
Steel hook. A thread is cut at its end for screwing into the pin. It is needed not only for pulling the surface by the brackets, but also as a reverse hammer for removing injectors - it is convenient for them to pick up obsolete parts that need to be replaced.
Welding machine. For home needs.
Steel washers - 2 pieces. Diameter – 3 cm.
Weight. Use a regular headstock from a store scale, without corners or protrusions. Otherwise it is inconvenient to use. Section up to 6 cm and length up to 15 cm.

To make it more convenient to assemble a makeshift model, it is better to have on hand a drawing of a reverse hammer with marked standard sizes. This will certainly increase the build speed. It is made as follows:

The rod is brought into proper condition - soaked in an anti-corrosion solution, ground and degreased. It is important that the pin for the homemade reverse hammer remains level - either it is selected according to this, or it is straightened at the initial stage.
One of the washers is welded onto the end of the rod so that when struck, the weight does not fly off the rod and touch the surface of the car body. Immediately equip the reverse hammer with a grip with your own hands - weld or screw a hook to the end of the rod.
The weight is drilled into lathe all the way through so that movement along the steel pin becomes unhindered. Check this immediately by putting on the weighting material from the other end. If he walks slowly, then increase the diameter of the internal hole.
After putting on the weight, a second washer is fixed at the other end to prevent the heavy headstock from breaking the handle.
All you have to do is put on the rubber nozzle and the reverse hammer for the spotter is ready. The makeshift model is tested in action on an old, unnecessary piece of iron and the shortcomings are eliminated, otherwise additional defects will appear on the car body.

Rubber attachment on the end of a body repair tool

To make a reverse hammer with a vacuum suction cup, you will need the same components, only instead of a hook you use a plunger - a new one, the old one will be of no use. First, they “suck” the nozzle onto the iron and then begin work. The advantage is that you don’t have to weld additional brackets to the body and then remove them, thereby spoiling the already ugly surface.

The model, which is a reverse electric hammer, is a version of a straightening tool equipped with a motor. There is practically no effort required to straighten dents - the power of the engine allows you to pull out and strike the iron with a greater amplitude than a person can do.

Straightening technology

It’s not enough to make a reverse hammer with your own hands - it’s important to know how to work with it in order to get a decent result or, at least, not do the worst. There are several options for straightening the body, depending on the problem:

Removing large dents

Typically, a reverse hammer is used to remove dents. It starts in a spiral - from the edges to the center. If you do the opposite, then only the center will shift, and the sides will remain concave, which will make the defect even more complex and rigid, and cannot be straightened in the usual way. Therefore, the work requires skill.

When the body profile is restored, the work cannot be considered finished - the view is not conducive. Next, direct forging occurs with the same tool, but with a smoothing attachment in the form of a spatula and a counter support. To carry out the work, you will need a reverse hammer with a set of attachments - this way the work will go well and even minor defects will be eliminated.

Eliminating bulges on the body

Dents are not without reverse effect– bulges appear on the area of the car. Their elimination is possible. This uses heat through welding to relieve the stress of the metal in the middle, thereby making the defect ready to be smoothed out. The work is carried out from the edge of the red-hot swelling to its center - it is felt by hand, it is where the spring is greatest. When the contours of the body are marked, the straightening area is shed cold water, which will further promote the retraction of metal.

The second way to fix bulges. It consists of cold straightening the metal to its contours using a support and a shovel-shaped attachment that is placed on a reverse hammer for body repair. And then ready place heats up to smooth out the installation contours. After which the defect is spilled with cold water. However, this method has a significant drawback - if the metal is thin, then the temperature difference will lead to rupture and cracks.

Correcting dents with a pulling hammer

This is the standard procedure described above. Let's take a closer look: the defect site is thoroughly cleaned of paint and varnish material over a larger area than necessary and the areas are carefully sanded. Auxiliary rings are welded to the dent, onto which the reverse hammer for straightening clings. They are then beaten off. Then, by hitting the load on the limiter on the handle, the force is transferred along the rod to the dent, and thus the tool will gradually pull out the defect.

A pull-out reverse hammer is needed to vertical surfaces car - it is not suitable for the roof and bottom; an ordinary mallet or a standard iron tool will do the job.

Electropulling

It is better to pull out small dents special tool, since a kickback hammer can cause large defects. Externally, the device resembles a short drill, where an electrode is inserted instead of a drill. As a result of the work, metal deposits are obtained in the center of the dent, which are then pulled out by pressing the reverse button of the device. A nuance - you cannot burn through the metal, so welding takes no more than 0.3 seconds, using point movements. If you have the skill to make a reverse hammer for a spotter with your own hands, it is possible, but not without difficulties, using a welding machine and a drill body with a retractable mechanism.

The complexity of the work lies in the diagram - the drawing of the reverse hammer for the spotter is not its most important part. Main element Such a tool has an electrical filling, which includes a transformer, stabilizer, thyristor and capacitor. If these words mean anything to a home-grown master, then he can safely get to work - the diagram is attached.

Fine body straightening

After the principle of operation of the reverse hammer has been mastered in practice and the surface of the body has reached a usable condition, it is brought to its logical conclusion. This procedure is considered to be treating the damage with files, after eliminating big problem. Fine grinding will not do the job, so they select coarse ones, but there is a nuance in the work - they deform the surface if there is no skill.

Final processing of the body

After straightening, it is not possible to immediately apply a primer or paint coating - the defects will become visible in all their glory. The body needs to be finally put in order. It consists of grinding the treated body with six or heptagonal discs that do not leave steps or small defects on the surface. A specialist consultant at the relevant store will help you choose the correct grain size of the wheel or the number of revolutions of the machine.

WATCH VIDEO INSTRUCTIONS

In conclusion, it is important to say that making a reverse hammer for your own needs and thereby restoring your own car is not difficult.

It is important to collect the available information and isolate the worthwhile nuances from it - then working with the tool will not become a burden, and the result will exceed expectations.

The reverse hammer is hand tool, designed to create a retracting force. If a regular hammer is used to hammer or deform a surface away from itself, then a device with a reverse action pulls the metal towards itself. Such equipment is used in body repair, in particular when straightening, and it is also used when it is necessary to tighten a bearing when it is not possible to hit it from the back side. Reverse hammers are rare because they are designed to perform highly specialized tasks that the average car enthusiast or mechanic does not need. The tool can be found in automobile service centers, as well as those drivers who have encountered self-straightening of the body.

How does a reverse hammer work?

The reverse action hammer is a metal pin about 50 cm long. Its diameter is 20 mm. There is a handle on the back of the tool. A freely movable weight is mounted directly on the pin itself, made in the form of a thick-walled tube, the length of which is adjusted to the size of the palm. The front end of the hammer is fixed in various ways to the surface to be pulled. To work, you need to grab the weight with your right hand and the hammer handle with your left. To create a pulling force, you need to pull away with a sharp movement right hand with a weight in the handle. This creates a blow, from which the hammer pin moves in the opposite direction, dragging the deformed surface along with it. Thus, almost the same effect is created if it were possible to hit with a regular hammer on the back side of the dent.

The working end of the hammer is fixed to the deformed metal using a vacuum suction cup, glued or welded attachment. If you need to work with the edges of the car body, then hooks and clamps are used. Each type of fastening has its own advantages and disadvantages, and therefore can only be used in certain cases.

The classic device of a simple hammer with reverse action is described. There are more advanced models that are equipped additional accessories, making work easier. Most often, they have removable attachments for fixing to the surface being treated, as well as a set of weights different weights. Thanks to this, you can select components to ensure more efficient performance of the job. For example, if the installed weight is too heavy and the body metal is thin, then instead of a straightened dent you will get a hump that will have to be pressed back.

How to use a hammer

It is worth noting that a reverse hammer is a tool that needs to be worked with very carefully. If you overdo it and apply too much force, other defects may form when aligning the dents. Auto body repair specialists do not recommend using a blowback hammer on very large dents that are present on the roof of a car or trunk. These parts are relatively easily accessible, so it is quite possible to remove the inner lining and apply pressure from the reverse side to squeeze the metal into its original place. In the same case, if a dent has formed on the side of the car, and especially on the sills, then using a hammer will be more than justified.

To accurately straighten a dent, you need to secure the tool pin at its beginning. It is unacceptable to immediately grasp the center of the defect, since when pulled back the metal will become wrinkled and sharp corners will be obtained. Often, when using a hammer on dents without sharp kinks, you can level the surface so much that the previous defect will be completely invisible. There is no need for putty or paint.

On significant defects you need to work slowly and smoothly. First, the rim of the dent is pulled back, as a result of which its diameter and depth will gradually decrease. At the final stage, the central part is pulled back. If the tool is attached to the body by welding, after each pulling it is necessary to cut off the fixation and grind the seam. It is unacceptable for weld residues to remain on the metal, since it acts as an additional stiffening rib, which interferes with work at other fixation points. Using a reverse hammer is a lengthy process that cannot be rushed.

When using a reverse hammer with fixation by electric welding, after each welding you need to allow the metal to cool, since the hot area stretches much more easily and does not drag the cold part of the dent along with it. It is also worth considering that it is unacceptable to start work if there is dirt, chipped paint and other deposits on the surface being treated.

Types of hammers

Reverse hammers differ in the method of fixation to the surface being processed. According to this criterion they are divided into types:

Vacuum.
With glued suction cups.
Welded.
Mechanical.

Vacuum return hammer

The vacuum return hammer is the most expensive and yet very effective. The tip of this tool resembles a regular household plunger used to clear a clog. sewer pipes. At the end of the hammer there is a rubber plate that is applied to the dent. The tool is connected to a pump that pumps out air between the rubber plate and the car body. As a result, the suction cup is securely fixed to the metal. After this, the hand holding the weight is sharply pulled back and a reverse thrust, pulling out the dent.

Typically, a set of vacuum hammers comes with 3 rubber pads of different diameters. The larger one is used for processing wide dents, and the smallest one for small defects. Such a hammer, when connected to a compressor, creates quite a lot of clamping power. The plate is applied not only to absolutely flat surfaces, but also to flat ones, which is especially important for cars with a streamlined body. Tool vacuum type Quite light and often weighs no more than 1.5 kg. The only inconvenience is the hose from the compressor.

The main feature of a vacuum suction hammer is that it can pull out a dent without having to remove a layer of paint. If the car has received a minor defect, it can be corrected with minimal costs without the need for puttying and applying a varnish layer.

Reverse hammer with glued suction cup

There are also reverse hammers that come with rubber pads. Such suction cups are glued to the car body using glue. After hardening, a hammer pin is screwed into the thread on the plate. Next, the usual alignment is carried out by sharply moving the weight. After the area is straightened, the hammer pin is unscrewed, and the glued suction cup is heated. When heated, the glue becomes viscous and the pad can be easily removed. After this, the surface is treated with a special solvent to remove any remaining glue.

The disadvantage of this tool is that the glue does not set when low temperatures. In this regard, it will not be possible to carry out editing in winter without a warm box. This method allows you to smooth out dents even without removing paint. The suction cups are glued directly on top of the varnish layer without corroding or damaging it. The formula of the glue differs from the composition of the paints, so the solvent does not take them, which eliminates the risk of color blurring when cleaning the surface from residual adhesive.

Reverse hammer with welding fixation

The most common are hammers with fixation using a welding machine. A nut is welded onto the body, into which the tip of the hammer is screwed. After this, the dent is pulled out. This tool has a number of disadvantages. First of all, this is due to the fact that its use requires availability. When working, you must first clean the surface to be straightened. The paint layer is removed to bare shiny metal. After this, the nut is spot welded and pulled out. Next, the nut is cut off and the surface to be straightened is sanded. At the end, the fixing element is digested to another point, and the action is repeated.

In fact, after the flaw has been corrected, it is necessary to putty, primer, paint and varnish so that the corrected part becomes uniform with the rest of the body surface. A similar tool is used in cases where there is a significant defect. Since the fixation is carried out using a weld, such a reverse hammer can be used even in the cold, unlike glued suction cups.

Mechanical hammer

The mechanical return hammer is an almost identical design with welded tools. The only difference is that its attachments are hooks and clips. With such a tool it will not be possible to straighten the central part of the dent, since the hook can only be fixed to the edges of the body. Craftsmen who only have a mechanical tool with hooks at their disposal can cut a hole in the body and hook onto them. After correcting the defect, the resulting slots are welded and ground. Since the hooks can be twisted, it is quite possible to pick up a regular nut and weld it to the dent. Thus, mechanical hammer can be used as a welded one.

The main function of mechanical hammers is to remove bearings. They are usually used to repair the chassis of a car when there is no access to the back part of the bearing to make a blow. Often the kit comes with special clamps that allow you to grip the joint cage at 2-3 points. Thanks to this, dismantling can be carried out without destroying the old bearing.

Many drivers, when faced with the concept of “reverse hammer,” do not understand what it is. Although, if you have never had to do body repair yourself, there is a high probability that you have never seen such a tool. But if you still have to repair the body, you cannot do without a reverse hammer. In this regard, the purpose of the article below is to tell not only what a reverse hammer is, but also how to make a reverse hammer for body repair with your own hands.

What is a reverse hammer for body repair?

In the process of working with a car body, the hardest and most important part is straightening, that is, leveling the surface of the body. To perform this task, even specialists need to have on hand professional equipment, which includes the reverse hammer.

IN classic version a reverse hammer is a pin made of metal and 50 centimeters long. The diameter of this pin is only 2 centimeters. There are only two elements on the pin: on one side there is a rubber bushing, and on the other there is a small metal washer. The task of the latter is to hold the bushing and prevent vibrations from impacts from transferring to the hammer body.

In addition to this, many reverse hammers also have hooks, with which the device can grab staples welded to the body, and thereby be securely held on it during straightening.

Purpose and types of reverse hammers

Often, a back hammer is used to remove small dents on metal parts of a car body that either cannot be accessed directly or need to be leveled from the reverse side. Using a reverse hammer is very convenient for working with car sills, wheel arches and pillars.

Important!A reverse hammer is designed to work on small areas, so it is not suitable for straightening large dents on the roof or trunk. This is due to both the operating technology that is used when using the reverse hammer and its size.

There is a classification of reverse hammers for body repair, which includes:

Vacuum hammers.

Spotters.

With weights(two and three are used).

Reverse hammers operating thanks to a pneumatic mechanism.

The specificity of straightening work depends on the type of reverse hammer. To level the surface of the body of a new car, it is better to use a vacuum return hammer, since only it allows such difficult work without first removing the paintwork. In the same case, if you are going to use one of the remaining types of hammers, the part of the body where the dent is located will first need to be thoroughly cleaned using sandpaper. Otherwise, the paintwork will still be damaged by the reverse hammer.

How to use a reverse hammer

The entire process of straightening dents on a car body using a reverse hammer should be performed in the following order:

1. Rinse the entire work surface with water to remove all contaminants, and be sure to treat the entire surface with a degreaser.

2. If necessary, remove from work surface paint coating. To do this, it is more practical to use a grinding machine.

3. Weld round repair washers to the area with the dent.

4. Attach a special hook to the reverse end of the hammer, which should come with the tool.

5. Hook the hook onto the washer.

6. While holding the tool by the handle with one hand, grab the weight with the other hand and point it towards the handle. In this case, your movement should be as sharp as possible.

Due to the fact that the reverse hammer is tightly coupled to the body surface, with every movement of the weight, the reverse dent is leveled. At the same time, the harder you hit the weights, the faster the process of straightening the car body will go.

Attention! It is necessary to work with a reverse hammer very carefully, since using it in the middle of the body can achieve the opposite effect. The point is that very often, when aligning one dent, new defects can form. Therefore, in such areas of the body it is more rational to use more professional equipment.

You must be extremely careful when working with a reverse hammer. Do not rush under any circumstances and after each blow evaluate how the dent has changed. This will help you avoid creating new dents at the edge of an existing defect. But if you work slowly and follow all the instructions correctly, you can remove a small dent in just a few minutes.

It is often impossible to repair a car body without a reverse hammer, although each time it is necessary to soberly assess the situation, and if the work area is too large, resort to using other tools. As for the reverse hammer, fortunately, such a tool for body work can be made with your own hands.

We manufacture our own reverse hammer

Today, reverse hammers can be purchased at any auto store. It is worth noting that they can be sold either as a separate unit or as part of a set of tools specifically designed for body repair. But since there are no complicated mechanisms in the reverse hammer, it can be made at home.

To make your own body repair tool, you will need to prepare some materials:

The pin is made of durable steel, 50 cm long and 2 cm in diameter.

Important! To make a reverse hammer, you can use a pin of a smaller diameter, however, its service life will be significantly reduced, since under the influence of constant impacts the thin base will rapidly collapse.

A handle or attachment that can be placed on a steel pin. The handle should be made of ebonite or rubber.

Welding machine and protective equipment for it (gloves, mask).

Steel hook no more than 0.5 mm thick.

A 16cm weight is about 6cm thick.

Steel washers in the amount of 2 pieces (a diameter of 2.5-3 mm is suitable).

We recommend doing all other work on making a reverse hammer for body repair with your own hands in the following sequence:

1. If necessary, we clean the metal pin from rust by grinding and process it perfectly flat surface any degreaser.

2. A hook must be attached to one end of the pin. If the hook has a thread on one side, it can also be threaded on the pin, creating a removable connection. Otherwise, you will have to use welding to attach the hook.

3. It is necessary to place a washer at the base of the hook, which will prevent the weight from moving to the working surface and accidentally damaging it.

4. To put a weight on a metal pin, you need to make a hole in it, the diameter of which should be 1 millimeter larger than the diameter of the pin. Thanks to this, the weight will be able to move freely, and you will be able to give it any possible acceleration.

5. The weight is put on the pin, and on top of it are attached steel sheets, which will allow you to grab it as securely as possible to strike the body. It is also worth putting and welding another washer on top of it so that the weight does not hit the handle.

6. Proceed to fix the handle. Please note that it should sit on the pin as securely as possible, so if possible it should be welded to the base of the pin.

This completes the process of making a reverse hammer. As you can see, if you prepare materials and tools in advance, all work will take no more than 40 minutes. With your own hands, you can even make a reverse hammer with a vacuum suction cup, which will greatly simplify the execution. repair work on the body. To do this, instead of a hook with which the tool is attached to the working surface, it is necessary to use special suction cups that can provide the same reliability of fastening.

A reverse hammer is a tool for auto body repair and you can make it yourself.

The product consists of several parts: a handle about 50 centimeters long, two lock nuts with washers, a weight and several hooks (other attachments, depending on the intended use).

The principle of operation is that a weight attached to a metal rod hits the locking nuts with each subsequent movement, thus exerting an impact on the fixed hook, which pulls out dents or bends in the deformed metal.

Materials and tools for manufacturing

A high-quality reverse hammer can be made in garage conditions without the use of serious equipment and with minimal material costs. The manufacturing process, if all the necessary elements are available, takes about 1 hour.

Basic tools and materials for making a reverse hammer:

Steel rod 12 mm, about 50 cm long;
Insulating tape, adhesive tape;
Steel rod 16 mm;
Two large steel washers with nuts;
Thread cutting tool;
Electric welding;
Vise for fixation.

Reverse hammer for body repair: step-by-step instructions

The process of manufacturing a reverse hammer begins with the preparation of the material. A metal rod 12 mm thick and 50 centimeters long will be used as a handle.

1. Making a movable “weight”

The weight for the reverse hammer is made of a rod with a diameter of 16 mm. The rod is cut into 5 even pieces, the length of which is 12-16 centimeters. The rods are secured to the main handle using electrical tape, and then they are welded together longitudinally welding seam. It is important to consider the absence of weld slag on the surface of the handle.

2. Tapping the top of the recoil hammer handle

The thread is cut for a long nut about 2-3 centimeters along the rod. This procedure should be carried out taking into account all angles, as this determines how strong the reverse straightening hammer will be.

3. Making bent hooks for a reverse hammer

These hooks are necessary for aligning parts in different planes. The production of elements is carried out individually depending on the needs of the user. The bending procedure is carried out using a sledgehammer and a stop.

4. Threading metal hooks

The threads are also cut on the finished hooks for the reverse hammer in order to use a long nut to connect the two elements necessary for the operation of this tool. Cutting should take place under at an even angle so that the two connected parts are without distortions, otherwise the hook may break off the thread during the working process.

5. Installing lock washers on the handle

To obtain a high-quality universal return hammer, it is necessary to make reliable lock washers. These elements take most of the load during impacts, so their installation must be carried out taking into account all angles. A thread is cut at the end of the handle onto which a nut and washer are then screwed. Before installing the washer, a rubber handle made of electrical tape or rubber hose is mounted.

6. Checking the functionality of the reverse hammer assembly