How to make a reverse hammer with their own hands
Making a reverse hammer and body repair with their own hands
Such kind of car repair as body repair is a rather complicated operation. You will need a number of special knowledge, as well as devices and tools. A reverse hammer plays an important role in auto body repair. This tool is simple enough and you can easily make it yourself. Especially since there are many recommendations and videos on this topic, as well as drawings.
Today you will learn how to make a reverse hammer with your own hands and how to use it properly for its intended purpose.
Rusty Hammer Restoration: Shiny with a New Wooden Handle
Features of the design
To fix dents in the metal of the car body, you need to make certain efforts, concentrated on a limited area. Getting access to this section can be very difficult. As a rule, specialized tool kits for dismantling bearings are equipped with such a device. If you do not have such equipment, you can make a reverse hammer with your own hands.
A simple version of a homemade reverse hammer
The simplest version is a steel rod with a length of 500 mm, diameter of 15-20 mm. There is a handle of rubber or wood at the front and a metal washer at the back. A weight walks along the rod, helping to increase the power to impact the object. The working tip is welded to the surface that needs to be straightened. The homemade reverse hammer can be secured with removable grips and hooks.
How to use
The working principle of the reverse hammer is as follows:
- First of all, you should inspect the damaged area of the car, pick up an appropriate hook based on the location and the main dimensions of the dent, so then correctly calculate the accuracy of the force application.
- Then it is necessary to thoroughly clean the repaired area of the body surface from the excess paint coat and primer up to the metal.
- Next, you need to weld on the metal surface of the dent special repair staples (washers) with a welding machine. If your electric spotter is delivered with a backhoe, you will only need to change the tip during the leveling process.
- Then you need to hook the brackets with a hook of a car tool, and then with careful and light strokes begin to pull out the dent.
- It is recommended to make the alignment until the damaged part of the body surface is completely eliminated.
- To get rid of dents on your car, you must first weld a few brackets and pull the hammer bar through their holes to remove the damage.
- After that the repaired surface defect should be treated with a primer and the body should be painted in the same tone as the vehicle body.
However, it is worth paying attention to the fact that such a device has its own disadvantages, because of which, together with the dent on the car body, the layer of paint, which has not even been damaged, is completely removed. In addition, the areas of extensive dents of the hood, roof and trunk surface of the car with its help is impossible to straighten. Welding staples can severely deform the metal, which will eventually lead to the complete replacement of the part.
Design and application of a reverse hammer, making the tool with your own hands
Many drivers, faced with the term “reverse hammer,” do not understand what it is. Although, if you have not had to do the body repair yourself, most likely you have never seen such a tool. But if you still have to repair the body, you can’t do without a backhammer. In this regard, the purpose of the following article. 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 an automobile body, the heaviest and most responsible part is straightening, that is, aligning the surface of the body. To perform this task, even professionals need to have professional equipment on hand, which includes a reverse hammer.
In addition to this, many reverse hammers also have hooks that can be used to grasp the brackets welded to the body and thus hold it securely in place while straightening.
Purpose and types of reversing hammers
A reverse hammer is often used to remove small dents in metal auto body parts that either cannot be directly accessed or need to be leveled from the opposite side. Reverse hammers are very handy for working on car sills, wheel arches and uprights.
There is its own classification of reverse hammers for body repair, which includes:
Reverse hammers that work thanks to a pneumatic mechanism.
The type of inverted hammer depends on the specifics of straightening works. To level the surface of the body of a new car it is better to use a vacuum backhammer, as only it allows you to perform such a difficult work without first removing the paint coating. If you are going to use one of the other types of hammers, the part of the bodywork where the dent is located will first have to be cleaned meticulously with 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 done in the following order:
Rinse the entire work surface with water so as to remove all contaminants, and be sure to treat the entire surface with a degreasing agent.
If necessary remove the paint from the work surface. It is more practical to use a grinder for this.
Weld the round repair washers to the area with the dent.
Attach a special hook to the reverse end of the hammer, which should come with the tool.
Grip the hook on the washer.
Hold the tool with one hand on the handle, then grasp the weight in your other hand and guide it toward the handle. Your movement should be as sharp as possible.
Because the reverse hammer is tightly bonded to the bodywork, the reverse dent is levelled with each movement you make with the weight. The harder you hit with the weight, the faster the auto body straightening process will go.
When working with a reverse hammer you must be extremely careful. Take your time and after each strike, evaluate how the dent has changed. This will help you avoid making new dents in the edge of the existing damage. But if you work leisurely and follow all the instructions correctly, you can remove a small dent in just a few minutes.
Often it is impossible to do without a reverse hammer in the repair of the car body, although each time it is necessary to soberly assess the situation, and if the area of work is too large. to resort to the use of other tools. As for the reverse hammer, fortunately, such a tool for bodywork can also be made with your own hands.
Making a self-made reverse hammer
Reverse hammers can be bought today in any auto shop. It is worth noting that they can be sold both as a separate unit, and 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 a tool for body repair with your own hands, you will need to prepare some materials:
A pin made of strong steel, 50 cm long and 2 cm in diameter.
A handle or nozzle that can be put on the steel pin. The handle should be made of ebonite or rubber.
Welding machine and welding equipment (gloves, mask).
A 16 centimeter weight, about 6 cm thick.
2 steel washers (2.5 to 3 mm diameter will work).
All other work on the manufacture of a reverse hammer for body repair with their own hands is recommended to carry out in the following sequence:
If necessary, clean the metal pin of rust by grinding and treat the perfectly flat surface with any degreasing agent.
On one end of the pin it is necessary to fix a hook. If the hook has a thread on one side, it can also be made on the pin, creating a removable connection. Otherwise, you must use welding to fasten the hook.
At the base of the hook must be placed a washer, which will prevent the movement of the weight to the work surface and accidental damage to it.
To put the kettlebell on the metal pin, a hole must be made in the pin with a diameter 1 mm larger than the diameter of the pin. This allows the weight to move freely and you can give it any acceleration you want.
The kettlebell is placed on the pin and the steel plates are placed on top of it, which will allow you to grasp it as firmly as possible in order to hit the body. Another washer should also be put on and welded on top of it to prevent the kettlebell from hitting the handle.
Proceed to fix the handle. Note that it has to 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 the inverted hammer. As you can see, if you prepare the materials and tools in advance, all the work takes 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 performance of repair work on the body. In this case, instead of a hook, with which the tool is attached to the working surface, you need to use special suction cups, which can provide the same reliability of attachment.
Reverse hammer varieties
Despite its simplicity, this device has acquired several versions over time. Each option is used in individual cases, which depend on the type of damage and the skill of the technician. In general terms, the design of this device is the same, as is its principle of operation. The only difference is in how the tool is attached to the body.
The most common reverse hammer is a metal bar, on one end of which there is a hook, and on the other end there is a weight with a stop. The hook hooks into a washer that is welded to the point of deformation. Applying impact forces on the weight, the deformation is pulled to the right moment.
The second, equally simple version of the reverse hammer differs from the previous one in that instead of a hook on the end there is a normal thread. To level the surface with such a device, it is necessary to make a hole in the center of the deformation, stick the threaded end there, and fix a washer and a nut on it from the back side.
The most complex type of this device has a vacuum device on the end, which is attached to the surface of the deformed part with thin air. The suction cup can be actuated either by a compressor or by the conventional method. This type of attachment allows the auto body repairer to repair minor damage to the body, and at the same time, preserves the paint finish of the area if it is intact.