Is it possible to cut concrete with a disk for metal?

Table of Contents:

Carbide metal discs

Availability of quality machining or construction tools for home use allows finishing repairs faster or carrying out restoration, construction or repair work more qualitatively and cheaply. For precise cutting of laminate, plastic, wood in modern conditions helps end saw.

Both professional carpenters and beginners need to cut all kinds of workpieces. All popular equipment options help you to appreciate the full quality of such hand tools.

Bosch (PCM series

With 1.2 kW power provides a cutting depth of 60 mm, vertical angle of 120 degrees,

Powerful 1,6 kW, kerf. 90 mm, angles 65 and 150 degrees,

Makita (LS 1040 series)

Professional tool 1,7 kW, cutting depth. 67 mm, weight 11 kg,

How to choose a metal blade for crosscut saw

This tool appeared on the market comparatively recently. Metal disc for mitre saws? Many people, even experienced craftsmen, find this source of derision and disbelief. Not so long ago, steel could only be cut with a flame cutter, a wheel of an angle grinder and a metal saw. Only wood and plastic materials could be processed on mitre saws.

But time has not stood still. Material engineers and toolmakers are constantly working on synthesizing new alloys. Today you can buy a cutting disc for a coping saw at any tool store. However, this tool works under tough conditions and is subject to wear and tear.

Pros and cons of carbide metal cutting discs

It would be desirable to note at once that in comparison with abrasive disks carbide disks have many advantages, but the price of equipment and the disks themselves restrains the popularity of their use. Let’s talk about everything one by one!

  • Cutting precision. To keep precision when cutting metal pieces, a carbide blade on a pendulum saw is one of the best choices.
  • Speed of operation. You will be surprised how fast the carbide blade will cut.
  • Huge disk life. The average blade life is five thousand cuts. Compared to an abrasive disc, it is immortal.
  • No harmful emissions. Working with abrasive creates a cloud of fine particles in the work area, which negatively affects human health.
  • Metal does not get hot. After you cut the workpiece, you can safely pick it up, it will be cold. The main advantage is that without exposure to temperature, the properties of the metal do not change.
  • Price. Carbide blade costs ten times as much as an abrasive blade. Metal cut-off assembly saw with a Makita lc1230 carbide-tipped (pobedite) disc (305 mm). At home, with infrequent use, such a disc will not pay for itself.
  • Loss of metal. Since disk Thicker than abrasive, you should take into account that the line for the trimmer will be thick.
  • Fears rust. If you think about sawing metal with rust, remember that in this case the drive will wear out faster.

Concluding all of the above, we can say that carbide discs belong to the more professional consumables. They have fewer disadvantages than the competition, but the price makes them unaffordable for residential use.

It is important to know

Modern manufacturers offer different models of equipment, so it is not difficult to find a particular model of equipment in the regions (as well as companies or professionals who quickly and perfectly perform the work). But you need to understand some aspects.

What you need to keep in mind when cutting concrete:

  • Wall saws are not used in high-rise panel houses because of the risk of flooding the lower floors with water. Also, the machine is not applicable to work in confined spaces, as the need to do a small amount of cutting.
  • To reduce the noise, the holes can be cut in parts (at least 6 parts). The cost of this operation increases according to the number of pieces cut.
  • All holes / openings in supporting structures are made only by certified companies and in strict compliance with the regulations.
  • Legalization of manholes / openings in the bearing walls requires an appeal to the municipal authorities with the provision of a complete set of documents.

Dust free concrete cutting. it is not an easy task, which can only be achieved in part. One hundred percent getting rid of dust is very difficult, but its quantity can be significantly reduced through the right choice of equipment and nozzles, cutting method, also the use of construction vacuum cleaner and create special devices to collect dust.

Concrete cutting procedure

Determining the type of concrete

Before sawing with an angle grinder concrete, you need to determine what type of concrete you are dealing with. This is due to the fact that different types of diamond discs are used for each type of material. For example, it may be reinforced with metal bars (reinforced concrete).

If the depth of cut is about 10 centimeters or deeper, then on “your way” you may run into a metal lattice (reinforcing frame). As mentioned above, there are special discs for this purpose.

You should also be aware that the structure of the material changes over time. Fresh concrete is more abrasive, while old concrete is harder. For this reason diamond blades for old and fresh material have to be different.

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If you have time, you can study the structure of the material in more detail, so that you can choose the most suitable tool for it. For example, if there is basalt or quartz in the composition, it will quickly dull the wheel. That’s why the diamond segments must be bound with a soft material so that the new diamonds “break in” more quickly.

Also keep in mind that the size of the filler affects the cutting speed. the larger it is, the slower the procedure is done.

Tip! Diamond tools are used not only for cutting, but also for other concrete processing. In particular, diamond drilling of holes in concrete or grinding with diamond cup discs are often used.

In photo: diamond wheel with laser solder

Choice of disc

When selecting a disc, it should be noted that there are two ways in which segments can be fastened to the blade:

  • Soldering with silver m. These discs are commonly used for wet cutting.
  • Laser welded. Such attachments are characterized by high performance, and are usually used for dry cutting.

In addition, when selecting a disc, make sure that its diameter and hole for fixing correspond to the technical characteristics of the angle grinder. Maximum speed is also important. It is desirable that this disc rate is higher, the maximum speed that can be provided by the angle grinder.

Once all of the above parameters have been determined, you can choose the best type of tool for maximum efficiency.

Concrete angle grinder with a segmented disc

Choice of cutting type

Usually cutting is performed with water, in which case the procedure is dust free. In addition, water can improve the efficiency of work, as well as increase the resource of the tool. Because the process can be interrupted, it can increase the cutting speed. (See also page 50). also article Stroebolzer for aerated concrete: features.)

However, there is not always a water source near the working area. In this case, the cutting is carried out dry.The dry cutting process must be intermittent, i.e.е. made up of several cuts.

Cutting

Once the angle grinder for cutting concrete is prepared, you can get to work:

  • The first thing to do is to outline the line for the trimmer, along which the cut will be made. It is desirable to fix wooden bars along the line, which will make the cut line even.
  • Then you need to turn on your own hands an angle grinder and make the cut with a depth of about 0.5. 1 cm.
  • Next, you should remove the bars and make the cut to the desired depth. While working you need to spray water on the blade. If the cut is performed dry, the procedure, as mentioned above, should be periodically stopped to allow the tool to cool down.

Please note! Before you start working, you must protect your respiratory organs with a respirator. In addition, you should also use other personal protective equipment. goggles and gloves.

This is, perhaps, the whole instruction for doing this job.

The main advantages and disadvantages

Diamond cutting discs are a universal tool. They are suitable for cutting not only metal, but also other hard materials: brick, reinforced concrete, foam concrete and others. The advantages of this tool are as follows

Diamond disc does not exert pressure on structures adjacent to cutting surface, does not change material structure during cutting. The time required to complete the job is considerably less than with other tools. the diamond wheel works in the absence of a spark stream and therefore there is no smell of burning.

The disadvantages of this equipment are its high cost, but the operating life of diamond cutting tool is much higher (almost 70 times higher) than that of abrasive discs, which perform the same job. Reduced downtime of equipment due to decreased frequency of tool change. Increased rotational speed and higher productivity with active cooling. The tool retains its geometry over its entire service life.

Marking of discs by color and size

It is worth noting that discs differ from each other by color of the front side, and this is no accident. The different colors on the discs are a label indicating what kind of work they can do, for example:

possible, concrete, disk, metal
  • Discs marked yellow are designed to work with tile or plaster;
  • Green is used for concrete or granite;
  • orange discs are used for brick or plaster work;
  • discs in grey are used for cutting ceramic tiles

Depending on the manufacturer, the color markings may vary slightly.

The discs also have different diameters. Disc diameter determines the depth of cut, the larger the disc, the deeper the material will be cut, but the higher the diameter, the lower the rotational speed. Another aspect of a larger blade diameter is a longer tool life, because the larger the diameter, the less pressure is put on each diamond. The maximum diameter of the wheel should always be within the capabilities of the tool. Violation of this requirement can disable not only the disc, but also the tool itself.

Nowadays, manufacturers produce discs with a diameter:

The most popular among owners of bucking machines are discs 230 and 125mm in diameter. For industrial-scale use of discs with increased diameter, as a rule, the machines on which they are installed, have high power and belong to the class of professional, called their cut-off machines or floor saws.

The color and size designations of our discs are as follows

It is worth noting that the discs differ from each other by face color and this is no accident. The different colors on the discs are the colors that indicate what work they can do, for example:

  • discs, marked in yellow, are designed to work with tile or plaster;
  • Green is used for concrete or granite;
  • orange discs are used for working with brick or plaster;
  • Grey discs are used for cutting ceramic tiles

Depending on the manufacturer, the color coding may vary slightly.

Also discs differ from each other in diameter. The deeper the material will be cut, the greater the diameter, the deeper the material will be cut, but the higher the diameter is, the slower the rotation speed will be. Another aspect of a larger diameter is a longer tool life, because the larger the diameter, the less pressure is put on each diamond. The maximum diameter of the wheel should always be within the capabilities of the tool. Failure to comply could put not only the disk but also the tool out of service.

To date, manufacturers produce disc diameter:

The most popular among the owners of bucking machines are discs 230 and 125mm in diameter. For industrial use discs of large diameter are produced, as a rule, the machines for which they are installed, have high power and belong to the class of professional, called their cut-off machines or floor saws.

Main characteristics and markings

one of the main characteristics of a diamond disc is its size, i.e. its outside diameter, which determines the maximum cutting depth. For a universal grinder (angle grinder, angle grinder), there is a size range: 115, 125, 180 and 230 mm. Powerful machines for metal cutting are equipped with devices with a diameter of 150, 300 and more millimeters. The centrally located seating holes are for mounting on the machine shaft and have diameters of 22.2 or 25.4 mm. Like any product, a diamond cutting disc has a set of basic characteristics:

  • type;
  • size;
  • The abrasive material from which it is made;
  • the material for which it is designed;
  • grit;
  • hardness;
  • type of bond;
  • maximum speed;
  • accuracy grade;
  • manufacturer.

These characteristics are ciphered in the alphanumeric labeling on every diamond cutting disc. Marking rules are not strictly regulated. Each manufacturer presents it in his own way, but the basic characteristics are always present.

Bakelite bond. B (B is the old symbol);

What is the marking on a diamond cutting disc?? As an example we look at the symbolic designations on the tool from the Russian manufacturer ISMA flex (see “Symbols and Figures”). figure).

2302.522.2 14A63H39 BU 80 m/s 2nd grade according to GOST 21963-82, where:

  • 2302.522,2. (DxTxH). dimensions: diameter, thickness and bore diameter.
  • 14A. grade of grinding material. in this case electrocorundum normal.
  • 63H. grit. here medium.
  • 39. sound index.
  • B. resin bond. Bakelite bond.
  • U. presence of reinforcing element. fiberglass reinforcement.
  • 80 m/s. operating speed.
  • 2 unbalanced grade.
  • GOST 21963-82. normative document.

Basic characteristics and markings

One of the main characteristics of a diamond disc is the size. the outer diameter, which determines the maximum depth of cut. For a universal grinder (angle grinder, angle grinder), there is a size range: 115, 125, 180 and 230 mm. Powerful metal cutting machines are equipped with fixtures with a diameter of 150, 300 and more millimeters. The centrally located seating holes are for mounting on the shaft of the mechanism and have diameters of 22.2 or 25.4 mm. Like any product, a diamond cutting disc has a set of basic characteristics:

  • type;
  • size;
  • abrasive material of which it is made;
  • the material for which it is intended to process;
  • grit;
  • hardness;
  • bond type;
  • maximum speed;
  • accuracy grade;
  • manufacturer.

These specifications are coded in the form of alphanumerical markings which are present on each diamond disc. The rules for marking are not strictly regulated. Each manufacturer makes it in his own way, but the basic features are always present.

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bakelite bond. B (B is the old designation)

What the marking on the diamond cutting disc means? As an example we consider the symbols on the tool from the Russian manufacturer ISMA flex (cf. figure).

2302,522,2 14A63H39 BU 80 m/s 2nd class according to GOST 21963-82, where:

  • 2302,522,2. (DxTxH). dimensions: diameter, thickness and diameter of mounting hole.
  • 14A. grade of grinding material. in this case electrocorundum normal.
  • 63H. grit. here medium.
  • 39. sound index.
  • B. bakelite bond.
  • U. presence of reinforcing element. fiberglass reinforcement.
  • 80 m/s. operating speed.
  • 2 unbalance class.
  • GOST 21963-82. normative document.

How to choose the right product

When selecting a diamond wheel, there are various reasons for each individual case to be taken into account. Next we will consider certain conditions that affect the choice of one or another option.

1st. material of treatment. Normal concrete is usually treated with a segmented dry-cutting disc. But if the concrete is new, it has the highest level of abrasion, and the wheels will “eat up” quickly. Therefore, in such cases, it is recommended to take wider discs.

Compared to the young old concrete is more robust, for it choose products with a moderate width. If it contains quartz sand or basalt, then to process such a material is ideal product, in which the diamond plates are soldered silver to the base. For cutting granite or reinforced concrete the best choice is a “soft” version that can be used to make holes in concrete floors, windows or doorways.

The method of cutting should also be taken into account. The introduction of wet technology helps to avoid such problems as:

Before buying solid discs, find out if the cutting equipment has a cooling system. If you will be dry cutting, then buy segmented products.

The next factor to consider is working conditions. So, in the home criteria is ideal to choose products with good quality-price ratio, through which you can handle concrete and reinforced concrete of medium reinforcement. If they are used not very often, they can last a long time in the absence of overloading.

A professional discs are designed for constant use, they are durable and have a higher resistance to wear. It is necessary to get such discs strictly according to their destination. So, if they are designed for marble, they are not allowed to cut concrete.

When choosing a disc, take into account the depth of cut and the kind of equipment you are going to work with.

The deeper will be cut, the larger should be the disc across. Also you need to keep in mind that if you fasten to the equipment very large circle its linear velocity will be very high, it will lead to the equipment wear. And if the circle is very small, it will warm up and slip.

If you are using massive wall saws, it is necessary to get special diamond disc saws, the external cross-section of which is about 1200 mm. A model with a working cross section of up to 400 mm are used for processing foundation blocks or concrete parts.

Circle for hand-held electronic tools have not so huge dimensions. If you cut the concrete during the repair, you can choose models with a cross-section of up to 120 mm. If we are talking about processing lintels in the lumen, slopes and other parts, then it is necessary to choose discs for the angle grinder on concrete or reinforced concrete with a cross section of up to 230 mm.

Stroborez operates by analogy with the angle grinder, but the concrete in this case is processed by means of 2-diamond disks. Cutting width and depth can be adjusted during operation. Cross-section varies from 110 to 365 mm depending on the depth of the groove. With discs for reinforced concrete and solid mortise cutters you can make grooves for utilities quickly and perfectly with dry technology.

MESSER V/M Diamond Universal Disc

Type: vacuum Main purpose: cutting of a wide range of materials Article number Diameter, mm Seating hole, mm Extras. hole Diamond layer height, mm Diamond layer width, mm Water supply required Price, 01-11-125 125 22,2 – 3,0 2,5 – 2 079р. 01-11-200 200 22,2 – 3,0 2,8 – 1 911р. 01-11-230 230 22,2 – 3,0 2,8 – 4 598р. 01-11-300 302 25,4 3,0 3,1 – 8 682р. 01-11-350 356 25,4 3,0 3,9 – 10 467р.

The following companies are deservedly popular among manufacturers:

  • Bosch. The German leader in power tools and related materials.
  • FIT. Canadian company produces tools for professional and domestic use.
  • Dremel. American company that produces high quality power tools.
  • Husqvarna. A Swiss company that’s known for its high performance and level of durability.
  • MESSER. Korean manufacturer, producing a wide range of accessories for bolt cutters.
  • Zubr. Russian company producing power tools and cutting equipment.
  • Hitachi Power Tools, Luga Abrasiv Extra. Has an excellent price-performance ratio.

Diamond cutting discs are an effective tool of high performance and provide a comfortable working environment. Have experience with them? Be sure to share it in the Комментарии и мнения владельцев to this article.

Diamond wheel for concrete for angle grinder will blunt if it hits the rebar?

Or designed for the fact that there are reinforcements in the concrete

It all depends on the time and effort of contact, if you persist in re-sawing, you’ll blow it, Adnazhno

I have a lot of 4’s in my walls. Sparks, but passes.

Sawed thin (5-6 mm) rebar several times. You can feel the drop in speed and the appearance of sparks. Due to the small number of hits have not noticed any changes in the disk.

I cut a welded wire mesh and rebar in the concrete a little bit accelerated wear did not notice

ilart wrote : Or is it designed for rebar to be in the concrete?

Alex_dr wrote : Depends on the type of wheel.

Often have been driven over rebar, even 10K with a segmented diamond wheel.No consequences.

Doka wrote: Often pass the rebar, even a 10 k, with a diamond segmented wheel.No consequences.

Who would argue! Diamond wheels for reinforced concrete. segmented.

Thank you all for the comprehensive information I will not be especially afraid of rebars now.

ilart wrote : Or designed for the fact that in concrete there is rebar

There are special discs for concrete and rebar cutting at the same time. They do cost a bit more. Before the new year I bought a Bosch angle grinder. I was offered one. It’s like a new model and everything. It really does look more sturdy than a simple concrete disc.

“Diamond discs are not suitable for cutting metal structures or steel and aluminum sheets. Nothing is written about the armature in the concrete.

How to work properly, safely and cut metal with an angle grinder

Carrying out repair work is often impossible without the use of a specialized tool. This includes the angle grinder, which greatly facilitates work in many areas. This tool is used to cut a variety of materials, as well as to perform grinding. Variety of accessories makes it a universal helper. To understand how to work with such an angle grinder correctly, you should familiarize yourself with the safety precautions when operating the angle grinder. It is a high-risk appliance, which makes the requirements for its use stricter.

Features and functionality of the angle grinder

Angle grinder has a simple design. It consists of a drive motor, which rotates the drive shaft with its various accessories via an angle gearbox. Thanks to its many interchangeable accessories, the tool can be used for a wide variety of applications. There are different attachments for each type of process. Angle grinder differ in performance, which is responsible for the functionality, and there are:

In addition, these devices differ in power: large, medium, as well as small. Carrying out metal cutting with a powerful angle grinder provides for the use of three-phase 380 V industrial network. Low-power household copies are connected to conventional single-phase 220 V mains.

Angle grinder cuts hard and also soft objects of stone, plastic, concrete, as well as wood, metal and other materials. The high speed of the angle grinder, fixed permanently, provides an opportunity to perform sharpening of a variety of cutting tools, including knives, cuts, drills. The angle grinder is an indispensable tool in machine shops, various construction work, rescue work, utilities and other areas.

Working techniques with angle grinders

The use of angle grinders requires compliance with basic safety practices. Cutting metal with the angle grinder requires secure anchoring of the part, the cut part must be in a free condition and not clamped by the disk during processing. Replace or install a new bit when locking the gearbox with the button. Some parts must be installed in strict rotation direction. The mounted special wheel is clamped with a nut, and it is sufficient to tighten it only slightly.

The rotating cutting disc is smoothly brought to the mark and a depth of about 1-2 mm is made. After that pressure on the tool can be increased and the cutting process can be accelerated. Grinding and polishing is accomplished without great effort, using only the weight of the machine. Machining is performed at the required angle with movement in a circle or in one direction. Grinding as well as deburring is done with special discs, which are marked accordingly. To understand how to work with an angle grinder on metal, we recommend studying the video with the process.

possible, concrete, disk, metal

How to cut with an angle grinder

Cutting a variety of materials with the angle grinder is performed by special discs. Their intended use must be strictly observed, so that not only the work is done properly, but also in a safe manner.

Before you cut metal with the angle grinder, you should learn the basic rules. The wheel is only subjected to forces in a radial direction. When changing the plane, the tool can break and create a dangerous situation.Cutting is performed by the lower part of the disc (the nearer part). After every five minutes of work take a break for up to half an hour. Slight watering of the cutting area cools the wheels and prolongs their service life. When cutting thick aluminum, kerosene is dripped onto the machining area.

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segmented, sintered diamond grinding wheels are used for cutting small concrete blocks. Sprayed water on the groove greatly reduces dust when sawing. Water cooling of the discs extends their service life. If water cannot be used, the wheel must be cooled with air.

Cutting-off wheels for stone materials are segmented with a diamond coating. Continuous use time should not exceed one minute. Always take the disc out of the furrow and make a short pause. After three to five minutes of constant cutting, the diamond coating will be completely destroyed.

Tile, tile cutting is performed by an abrasive disc that has a diamond spraying for dry or wet cutting. The first variation is used to create a small cut, and the second is designed for a long process.

possible, concrete, disk, metal

How to work correctly with an angle grinder

To understand how to cut with an angle grinder you must follow basic rules. During cutting you should constantly monitor the level of wear of the working disc. Its size determines the depth of cut at the base of the product. This removable consumable requires periodic replacement.

The wheel axis heats up to high temperatures at high rpm. To increase the efficiency of processing, it is watered for cooling with plain water. This greatly increases the productivity of the process. It is not recommended to use the maximum permissible power, as this will accelerate the wear and tear of the working element, and increase the likelihood of breakage. Speed values should be within one-third to half of the maximum rpm specified by the manufacturer.

possible, concrete, disk, metal

Cutting thick metal

Cutting metal parts requires the right technique as well as some precautions. In order to understand how to work properly with any angle grinder, you must clearly follow the main rules. No pressure should be applied to the working tool during cutting. It is fraught with rapid overheating, jamming or wheel breakage. Correct sawing is only done in a straight line. Getting a product with a complex configuration is made by making several straight cuts, followed by removal of unnecessary parts.

Cutting profiled sheeting and metal tiles

Cutting of steel sheet materials, as well as trapezoidal sheet, metal tiles is made by special discs, which are designed for different thicknesses of products. Before you cut these items, you need to familiarize yourself with how to properly cut metal of this type with an angle grinder. Thin metal sheets are cut with circles, which are equipped with small-sized teeth and are marked accordingly. It is taken into account that the edges of the cut can melt, which can lead to increased corrosion processes.

Metal cutting wheels: What to cut metal with

Abrasive cutting discs for angle grinder in considerable quantity are available at any construction market or store. How to find the right one?

At

Expiration date

In the “quarter/year” format. The expiration date is usually given in the form of a code such as “V04/2014”, which is stamped on the metal ring around the seating hole. The code is easy to read: V04 is the quarter number of the first month. That is, a disc with this marking is valid until the second quarter of 2014, since the first month of the second quarter is April (the fourth month of the year). Other possible markings are V01 (January), V07 (July) or V10 (October). The year is indicated with a fraction. Expired goods should be discarded. Also, plan ahead when buying: so that the metal cutting discs you buy will not lie idle for months.

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Thickness

The thinner the blade, the easier it is to cut. A thicker disc puts more resistance on the material and thus more effort is needed to cut. Finer wheels cut much more easily, faster and cleaner. They heat the material less but wear out more. They are ideal for smaller angle grinders or cordless models that use less power per cut. The standard thickness for a 125 mm disc is 2.3 to 2.5 mm. The thinner version for the same disc diameter is 1-1.2 mm.Thin discs are no more dangerous than thicker discs. There is a perception that the thin metal cutting discs easily break on the move, so many are afraid to buy them. There is in fact nothing to be afraid of, because regardless of the thickness, there is a reinforcing mesh inside the wheel. Well, and if a breakup does happen, the splinters will be relatively light.

Specification

In the form of a four-digit code. It encodes the parameters of cutting grains and bonding. the main elements that make up an abrasive wheel. Its specification depends on these parameters.How to read the code. e.g. “A 30 S BF”?

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Selection recommendations

The main criterion is the compatibility of the diamond wheel with the tool and the cutting technology selected. It is important to understand the principle: the diameter and speed of the discs may not be greater than the allowable for the available gouge cutter or angle grinder, wet cutting products are not used in the absence of water supply, the reverse situation is allowed. The diameters and methods with regard to the type of construction tool are given in the table.

Type of equipment Diameter, mm Optimal concrete cutting method
External Planting
Hand torch 300-400 25,4 Both methods
Cutting machine 500 60 With continuous water supply
angle grinder or chisel gun 115-230 22,23 Dry cutting

The specified values are average and recommended values, to avoid errors when selecting diamond blades, they are consistently taken into account:

Concrete density and abrasiveness. Freshly hardened mortars erode the discs faster and require thicker cutting tools, especially in the presence of coarse-grained quartz sand, granite or basalt. When working reinforced and high-density materials it is worth choosing diamond discs for reinforced concrete with silver brazing. The minimum recommended product thickness is 2 mm.

Intensity of use. For one-off jobs, you buy affordable products with medium durability, and for professional applications, you buy products with a long service life, high quality and percentage of diamond grit.

Type of operating equipment and availability of water cooling system. Blades for hand-held power tools are segmented or turbine-driven and are mainly used for dry cutting; continuous water supply is available for professional machines.

The required depth of cut, this factor is influenced by the diameter of the wheel. A high value (above 350 mm) is required when working with large structures and wall blocks, when processing slopes, apertures or window lintels. in the range of 150-230, when carrying out internal repairs (piercing for wiring, laying small channels). 115-120. The upper limit depends on the parameters of the working tool, the diameter of the diamond wheel for stroblitzers (remember, there are two) ranges from 110 to 365 mm, the angle grinder. 230 mm.

Seating hole dimensions. In concrete, the recommended minimum is 20 mm.

Disc quality, manufacturer reliability. Good professional discs for concrete offer Bosch, Keos, Hilti, Distar, to the acceptable include products Zubr, Metabo, Norton, Matrix and many others. Attention is paid to thickness and method of diamond layer dusting; durable discs have sprinkles distributed on the whole volume of the cutting part.

Maximum allowable rpm of the disk. This parameter must not be lower than that of the work tool.

All this information is always printed on the packaging; the marking on the diamond disc itself shows the basic dimensions and material. Bowls for grinding are chosen according to their purpose (roughing or polishing).

Name, manufacturer Type, purpose Cutting method Maximum rpm Thickness, mm Seat diameter, mm Wheel diameter, mm Price, rubles
Spetsz, China Diamond cutting segmented disc dry 6600 2,4 22,23 230 825
Hilti DC-D 12250 2 125 630
Jet Norton Granit, Poland Continuous with corrugated touring edge, permits cutting of reinforced concrete 13300 2,2 115 430
Metabo, Germany Diamond disc, solid, with welded diamond edge wet 12200 2,15 125 425
Keos Professional, South Korea Segmented, high frequency toothed Both ways 3,2 25,4 230 9560
Enkor Expert, Russia Turbi-style, for cutting reinforced concrete dry 12900 2,2 22,23 125 710
Iterscolar Era, China With turbo edge with diamond concentration of more than 30% 6600 2,5 230 1140
Bosch Best for Concrete, Germany Diamond wheel for grinding thick layers of concrete 4,5 125 11200

Reviews of usage

When choosing and buying diamond discs, you must determine the type of work to be performed, as well as the conditions of use. When buying cheap discs, you should take several pieces, as their quality will be very mediocre.

When working in ordinary rooms with not particularly thick walls will do and the usual 12-13 cm variant, but when cutting concrete lintels it is better to take discs from 20 to 25 cm.