A wall-cutting attachment for a grinder: how to do it yourself according to the drawings? Homemade nozzle for dust-free chiselling on angle grinders

What recommendations and tips to consider when chasing

You can start the procedure for preparing grooves in the room immediately after making a homemade product. When punching a groove, one important nuance must be taken into account - the work should be carried out in a room where the locations of the electrical wiring are previously known. If an energized wire is encountered on the path of the instrument, the result of such a meeting can be fatal for the master.

It is necessary to carry out chipping work with both a conventional chasing cutter and a grinder, taking into account the following tips and recommendations:

The procedures can be carried out in vertical or horizontal directions.
It is possible to slant at an angle in extremely rare cases when it is necessary to bypass a decorative element or communications
Horizontal slitting must be carried out only at a distance of up to 15 cm from the floor slab
Vertical grooves should be located at a minimum distance of 10 cm from doors and windows
When carrying out work, it is important to take into account the depth of the groove. It is necessary to choose the depth depending on the type of communications that are planned to be laid in the groove, as well as on the thickness of the wall itself. If this wall is load-bearing, and is external, then the depth of the groove should not be more than 3 cm
The groove width is also selected depending on the technological task, but it is not recommended to exceed the permissible limit of 2.5-3 cm

If this wall is load-bearing, and is external, then the depth of the groove should not be more than 3 cm
The groove width is also selected depending on the technological task, but it is not recommended to exceed the permissible limit of 2.5-3 cm

After laying the communications, the groove should be repaired with cement mortar. The location of the groove should be leveled with the plaster of the wall. It is recommended that chipping work be carried out at the construction and repair stage before plastering the walls.

It is not at all difficult to make a wall chaser for concrete from a grinder, and if you set yourself such a goal, then everyone can achieve it. When drawing a conclusion about the work done, it should be noted that when chipping, you need to take breaks to allow the power tool to cool down. If the cover does not have a connector for connecting a vacuum cleaner, then work must be carried out in a respirator. Glasses must be worn in any case, as various small particles can enter the eye.

Depending on the type of material that is being channeled, it is necessary to select the appropriate speed of movement of the tool. If on the way you come across reinforcement in a concrete wall, then it is recommended to cut it with an abrasive wheel.

It is necessary to use a wood chaser with extreme caution, not forgetting about the reverse impact

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3 Simple construction of the casing made of scrap materials

If it is not possible to purchase a ready-made casing, then it is made from available materials at hand. The design is simple, but reliably protects against small fragments. The size is chosen arbitrary, taking into account the diameter of the available discs, the width of the groove being machined.

For work in confined spaces, it is necessary to provide for the installation of a dust removal system.At home, a vacuum cleaner is usually connected, but always of a cyclone type, since the trapping filter in a conventional design is quickly clogged with cutting products, and the air exhaust performance immediately decreases. So that the vacuum cleaner does not complicate the work, the hose is extended up to 2 meters and an extension cord is used.

If there is no danger of severe pollution of the premises, their interior decoration, then the simplest design of the required size is chosen. The body is made from any construction waste - from pieces of plywood, laminate. Since the wooden surface of the casing slides smoothly when the tool is moved along the wall, there is no need to install the guide wheels. It will be more convenient to cut a flat horizontal strobe by attaching a guide bar to the wall - any board, as a rule.

Main disadvantages:

It will not be possible to completely prevent the formation of dust, but the protection of the working area from cut products will be ensured.
The slitting depth is not adjustable, access to the control button is difficult.

This design allows you to effectively carry out the same type of cuts when laying electrical wiring throughout the house, but to increase the efficiency of work, it is necessary to make a full-fledged device with a groove depth regulator, a pipe for dust extraction. For example, from an old saucepan of a suitable size.

Cut off the walls, the height of which should correspond to the maximum width of the cut. A hole is made in the center of the bottom for the diameter of the standard casing. Next, the fastening clamp is welded. To increase the rigidity, an additional sheet of metal is welded on.

The outer side, cut from sheet metal, is welded from the back, the pipe cut from the pipe for attaching the vacuum cleaner hose to the rounded side, and the handle pin to the upper part.

For the sole of the support platform, a rectangular profile is taken. It is cut into two parts, each of which is fastened by welding at right angles. Additionally, two cheeks are grabbed. A workpiece from a pan is installed on the platform. An elongated nut with a stud is attached to the back of the workpiece, which regulates the cutting depth. The attachment is ready.

How to make a strobe in a concrete wall

The main document regulating the features of performing strobes in any tool is SNiP 3.05.06-85. It specifies the rules for creating electrical wiring, all distances and basic safety requirements. If you ignore them, you can not only endanger the comfort and safety of people living in the room, but also be fined.

Before starting work, you need to carefully mark everything, determine the places of passage of wiring, installation of sockets, switches and other elements. Installation is carried out taking into account the requirements specified below.

Normative requirements of SNiP for chipping walls for wiring:

Bearing walls cannot be gouged.
The channels must be laid parallel to the structures: horizontally or vertically, it is impossible to groove diagonally.
The distance between the ceiling and the groove must be at least 15 centimeters.
There must be a distance of at least 40 centimeters to the gas pipe.
The depth of the groove is no more than 2.5 centimeters.
Before laying new wiring, you need to check the walls for the presence of an old one (if it is not a new building).
The strobes are laid exclusively vertically / horizontally, no oblique lines are allowed. An exception may be the need to lay wiring on walls with a slope (attic, for example), when the line can be run parallel to the slope of the wall.

You can turn the strobe between two points only once: each turn is a bend in the cable, which heats up more in such places. And if there are a lot of turns, the danger of exploitation increases.
In terms of size, the strobes should be as follows: maximum 3 centimeters in width, no more than 2.6 centimeters in depth.The total length of the line from the junction box to the point should not be more than 3 meters.
Optimal margins: from batteries and gas pipes 40 centimeters, to the door 10 centimeters, from the floor - at least 5 centimeters (but better than 10).
It is forbidden to touch reinforced concrete structures during the chipping process, but if this is done, then so as not to touch the reinforcing cage and with a minimum groove depth.
It is forbidden to grind the internal load-bearing walls; on the first floors, the work is done very carefully, since here the walls hold the entire building.
The slitting in the ceiling is realized with the calculation of the shortest path to the lighting point.
Do not cut grooves in the floor slabs. When the line is drawn across the floor, it is made into a concrete screed, which is poured taking into account the need to lay furrows.
In the process of performing work, they must take care of personal protective equipment - a respirator or mask is suitable for these purposes.

What tasks does an electric furrow tool solve?

The best concrete chaser is, of course, an electric one. Tools of this type are suitable for making furrows not only in brick walls, but also in reinforced concrete and even stone structures. Agree, it would be impossible to cope with this manually. By design, such a tool resembles an angle grinder. Such a unit is capable of cutting furrows using discs with a diameter of about 150 mm. The discs are fixed in the same way as on grinders.

During operation, a large amount of dust is generated, and it must be disposed of in a timely manner. Therefore, it is always necessary to use a vacuum cleaner in parallel with this tool. Basically, all modern models of the tool are additionally equipped with a special system that connects the vacuum cleaner directly to the furrow cutter. It is convenient, and a good aid for pumping out dust.

It is important to have overalls when working with this tool: and these are glasses, respirators, and ear muffs

There are electrical tools specifically made for concrete. They are distinguished by the existing rubber rollers, which facilitate the movement of the tool over the working area. The work of the built-in device starts the movement of the electric motor by a rotating body with several incisors. For convenience, hand holders are attached to the tool. Often, when working with such a device, additional tools are needed, without which it is impossible to do the job correctly and efficiently. It is difficult to cope with the work in this case without a level, ruler and pencil for marking.

Device and features of the wall chaser

In appearance and functionality, the chaser resembles a grinder with two discs. This is actually the case, because it was the angle grinder that was taken as the basis for this tool. The main difference is that there are as many as two discs in the chasing cutter, and the very high power of the tool allows you to cut out large areas of walls very quickly and with minimal effort from any material - from brick to concrete. The principle of operation of the device is the same as that of the grinder, cutting discs drill the walls to the desired depth, but there are also significant differences.

Consider the complete set of the wall chaser:

The cutting head is located strictly perpendicular to the platform.
The platform, or sole, of the chaser allows you to rest it on the surface to be cut, making it easier to work.
By adjusting the sole, you can set the required groove depth.
Mandatory equipment of the tool with a vacuum cleaner.
Two cutting discs that can be adjusted to the desired distance between the grooves.

Since the chaser is a professional narrow-focus tool, it has disadvantages:

High price. A high-quality power tool is expensive and pays off only when the master constantly works with the tool. In the case of a single use, it makes no sense to acquire it.
A narrow list of work performed - Cutting tiles or metal will not work due to the presence of two discs instead of one.

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Chasing cutter design

However, a wall chaser has one difference from a sander. It lies in the fact that the creation of grooves is twice as fast as using a grinder. Plus, using it for this purpose:

the edges of the grooves are smoother;
work becomes safer.

If we talk in more detail about the design of the wall chaser, then we note that it is a cutting machine of high power. It is equipped with two diamond discs. The specialist can adjust the distance between them.

You can also adjust the depth of cut. By changing the distance between the diamond discs, you can cut grooves of different widths and depths. The adjustment range varies from 3 to 40 mm.

Functions of the elements of the wall chaser

The main element of this tool is a saw blade, which is mounted on a shaft. To ensure good safety when working with this tool, a special guard for diamond blades is installed. This eliminates the risk of flying fragments. When sawing, there is no chance of them getting into a person.

All models of manual wall chasers have branch pipes as part of their design. An external construction vacuum cleaner is connected to them. Thanks to this equipment, the appearance of dust in the room during work is excluded.

This tool has a platform that is equipped with guide rollers and a slide. The number of the latter can vary from 2 to 4 pieces. The platform can be installed relative to the spindle axis in a variety of positions.

When the disc is removed from the cut groove, the slide will lower, which will lead to its fixation. This blocking ensures safety when using the tool.

The ability to obtain a high quality cut is ensured by:

The presence of a high-power engine in the equipment of this tool.
High revolutions of diamond discs.

In modern models of wall chasers, there is an engine as a power plant, the power of which varies from 0.8 to 2.5 kW. To increase the convenience of using this tool, it is equipped with special handles.

It's great if the chaser has a slip clutch. Thanks to it, a smooth ride is ensured. It will not be superfluous to have a wall chaser and an overheating protection system.

Another useful feature that does not hurt is brush wear control, as well as electronic overload protection. Thanks to the latter function, the tool will be able to shutdown in a situation of significant loads.

How it works and how it works

The device of the furrower is similar to the device of an angle grinder (LBM). The working discs are rotated by a powerful high-speed electric motor of the asynchronous type. Through the gearbox, the rotation is transmitted to the spindle, to which the diamond discs are attached. This is where the similarities with the grinder end.

Chasing device

A distinctive detail of the furrow maker is the volumetric casing designed for trapping and removing dust. As a rule, there are several seats on the casing for additional handles. This allows you to select the optimal position of the tool during work. The casing is located on a mobile platform, which is equipped with wheels in the lower part. There can be from 2 to 4. Rolling the platform along the wall, the operator cuts the furrow along a predetermined line. Thanks to such a device, there is no need to adjust the degree of depression and the chaser easily slides over a rough wall surface. On one side of the casing there is a dust outlet.The suction tube of the vacuum cleaner is connected to it.

A vacuum cleaner hose is connected to the dust outlet

A device is also located on the housing of the casing cutting depth adjustment... In different models, you can find different design solutions for this function. But the general principle is that the casing moves relative to the movable platform and is fixed in the desired position. On the outside of the body, there is a marking of the cutting depth.

The ruler on the body shows the cutting depth of the discs into the wall surface

It should be added that many wall chasers are equipped with additional electronic equipment. This increases their cost, but also increases performance. Such systems include:

Engine speed control. Provides the user with the ability to manually adjust the rotational speed of the discs. This is important when chipping walls made of various materials (brick, concrete, cinder block, foam concrete, etc.)
Soft start system. A very useful feature for extending tool life and providing increased work safety. As practice has shown, most breakdowns of this kind of equipment occur at the time of a sharp engine start.
Disc braking automation. Reduces the time to stop rotation after turning off the engine, dampens inertia.
Anti-vibration device. With its help, micro vibrations of the wall chaser are absorbed during operation. With prolonged use of the instrument, the operator may experience the problem of "tremor" - a violation of blood circulation in the hands.
Blocking the motor in case of overheating. The "weakness" of all asynchronous motors is that at high loads, the armature windings heat up sharply, up to melting. Outwardly (except for an increase in temperature), this is not expressed in anything and this is a danger - the motor may fail.

It is because of the equipment with these functions that many wall chasers from such reputable companies as Bosch, Makita and others have a high cost.

But you need to understand that without them the tool will last much less time.

BULGARIAN CUTTER WITH OWN HANDS

It makes no sense to buy a wall chaser starting at $ 500 in order to grind several channels for laying pipes in a concrete wall. It is easier to make a nozzle for a home grinder, especially since the constructive device consists of only three elements:

Protective casing with a branch pipe for connecting a vacuum cleaner;
Guide roller system;
Fastening with an intermediate insert, which allows you to simultaneously attach two cutting discs to the grinder shaft.

It is clear that the grinder mechanism, and first of all the gearbox, must be absolutely serviceable. Even one disc with a diamond edge at high speeds creates tangible vibration loads on the grinder body. Two cutting circles, in the event of a runout in engagement, can burn the worm and the grinder wheel in a few hours of operation of the chaser with a nozzle.

The optimum engine power is 1.9-2 kW. All industrial samples of wall chasers are equipped with an automatic smooth start of the engine, it may not be in a conventional grinder, so it is best to plan a nozzle for 125 mm discs.

TOOLS AND MATERIALS

To make a nozzle for a grinder you will need:

Black sheet steel with a thickness of 2.5-3 mm. Aluminum and plastic, especially wood, do not withstand hot sparks, and pieces of the braid and stone of the cutting disc on concrete often pierce the casing of soft materials;
Armature or steel bar 6-8 mm thick;
A pair of bearings with an inner diameter of the sleeve equal to the transverse dimension of the steel bar;
Steel bush - a blank for the manufacture of the adapter shaft and fastening nut.

It is best to use black metal for manufacturing, the base of the case can be welded by electric welding, and the side panel can be made removable with wing clamps or wedge latches.

It is not necessary to buy commercial sheet metal for the manufacture of a nozzle - a wall chaser for a grinder, any small saucepan, a piece of pipe or an old oil tank can do. Among other things, you will need to select a small nozzle with a diameter equal to the section of the hose nozzle of the home vacuum cleaner.

DRAWINGS AND DIAGRAMS

The simplest version of a homemade grinder attachment is shown in the photo and diagram. The design is a detachable metal cover fixed to the grinder instead of the standard steel half casing.

The dimensions of the protective cover of the nozzle are selected based on the power and dimensions of the grinder itself, as well as the diameter of the cutting wheels.

The larger the disc, the more expensive the grinder will cost. For a house, a 125-150 mm disc is enough, circles of 180-190 mm will need to be used with a 2 kW engine. Moreover, for the nozzle body for the grinder, you will have to use metal with a thickness of 3-3.5 mm, which significantly makes the tool heavier.

PROTECTIVE CASING MANUFACTURING

The best blank for making the casing body will be an old enamelled metal pan. The ferrous metal of the workpiece makes it easy to weld, drill, rivet, cut without restrictions, and the enamel coating will serve as additional protection against flying concrete chips and abrasives.

First of all, we mark the position of the hole for the output shaft, the flange and the fixing nut of the grinder.

Cut the hole with a circular drill.

Using spare parts from the old grinder casing, we rivet an additional reinforcement from a strip of steel to the wall of the nozzle, to which we weld the fastening clamp.

At the end of the workpiece, we cut a hole for the outlet for connecting the vacuum cleaner, and in the upper part of the nozzle - the chaser, we weld an M10 hairpin to install a new handle.

We cut out the second cheek of the casing from a round workpiece, 15-20 mm in diameter larger than the size of the finished part of the nozzle. Cut the petals around the perimeter, bend them at an angle of 90o. We insert the finished “cheek” into the main part of the body.

Manual model for working with aerated concrete

Well, and the last thing I would like to tell you about this topic is the use of a special wall chaser for aerated concrete and foam blocks. The principle of operation of this tool is to scrape off a certain amount of material due to its softness and looseness. This tool allows you to easily make grooves for cable laying by hand, without electricity. If your house is built of aerated concrete and you decide to carry out electrical wiring in the house, we recommend that you do not waste your time making a homemade tool, but simply buy a finished product from the manufacturer. The cost of a manual model does not exceed 500 rubles, which is not much, considering the amount of work throughout the living space. If you still want to make a manual wall chaser for aerated concrete, we recommend that you familiarize yourself with the video assembly instructions:

Hand tool making

So we told how to make a wall chaser with our own hands from a grinder and improvised means. We hope that the information was useful and interesting for you. Be sure to watch the video examples to learn about all the intricacies of making homemade products at home!

Related materials:

How to chisel walls for electrical wiring
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