What wheel to cut metal with an angle grinder. Classification of discs for angle grinders

Technical data of metal cutting wheels

Cutting or abrasive wheel is used in conjunction with an angle grinder. It is a consumable through which the useful work takes place. Often the purchase of consumables for power tools raises a lot of questions. The answers to these questions can be found in the material, which details all the technical characteristics of cutting-off wheels for angle grinder.

Disc for angle grinder is also called a disc because of its similarity to the grinding wheel. These tools are called cutting-off wheels because they consist of multiple layers of reinforcing steel. Why metal cutting discs are made of abrasive materials and not steel? The contact between the two steels would cause them to overheat quickly and reduce productivity. Abrasive wheels are composed of fine grit of aluminium oxide and carbide, which are stronger than metals. When cutting metal structures with electrocorundum discs, the fine particles burn off and thus produce a cutting result.

What is a disc for metal angle grinder

Disk or cutting-off wheel is a special attachment for grinder, which is used to cut metal products of different thickness.

Structurally, this part is a rounded billet of small dimensions with a through hole in the central part. In the course of long-term use, even the highest quality nozzle begins to wear out and because of this it has to be replaced. But before you change the old disc, you need to choose a new one.

When choosing a cutting disc, people face certain difficulties. The fact that such products differ from each other in the size of the outer part, the diameter of the hole and the thickness. That’s why many do not know how to choose the right disc.

How to cut a pipe with an angle grinder

For cutting pipes with angle grinder, it is recommended to use discs no thicker than 1 mm, otherwise it is harder to cut, too many sparks and flaming particles will fly out.

wheel, metal, angle, grinder
  • clamp the pipe in a vice or fix it in another way. At the same time, the part to be cut off must be hanging down. It is not allowed to put the workpiece between two supports and make the cut in the middle, because. к. there will be a jamming of the cutting blade (because of the sagging of the pipe).
  • Using a strip of paper and painter’s tape, a marking is applied. The ends of the belt should fit together as closely as possible. Homemakers recommend lowering the pipe into the liquid at the desired angle, and then mark the line for the trimmer cut on the border of dry and wet.
  • The cut should be made from the top of the pipe, gradually lowering the angle grinder below. The cutting disk should run right along the edge of the pasted strip.

A pipe with a large diameter must be cut in a slightly different way because the working area of the disc does not allow for it to be done in one go. The wall is cut by sector, and the pipe is rotated by the desired side.

Grinding and polishing models

A huge variety of consumables are available for the angle grinder, allowing you to grind and polish different surfaces.

According to the type of coating used, discs are divided into:

In addition to its own abrasive coating, in conjunction with many interchangeable materials require the use of fine abrasive pastes.

Rough grinding of the surface, using fine abrasive grinding wheels. Final polishing is done with a cloth or felt nozzle.

Types of ceramic cutting

In contrast to the flat grinder angle grinder allows you to perform different types of cutting. But each case has its own peculiarities, which you should pay attention to.

Straight cut or straight cut

This is the standard way to cut ceramic tiles. It involves cutting the material in straight lines.

  • Initially, it is necessary to mark the line for the cut trimmer. Use a ruler and marker for this.
  • Position the workpiece on a straight surface and remove any excess.
  • Clamp the tile in a vice.
  • Make the first cut to a depth of 1-5 mm, depending on the thickness of the material. When entering the tile, reduce the speed, and then increase the speed.
  • angle grinder must be led from itself, with the same speed, evenly.
  • When leaving the material, you must also reduce the speed in order to avoid chipping.
  • Break the workpiece along the cut line.
  • Deburr the edges with a tool.

Important! When cutting, it is necessary to adhere to the chosen trajectory as much as possible.

Make a curved cut or a curved cut

This type of work is the most difficult. Therefore, requires a certain skill for quality performance.

  • Before cutting a ceramic tile with an angle grinder, make a marking with a marker.
  • Place the tile on a flat surface, fix it.
  • Then make small vertical notches, cutting off excess material.
  • When finished, there will be irregularities, which must be treated with an abrasive wheel.

Cutting rectangular holes in tiles

In this case, you need to prepare a drill to make holes along the edge.

  • Use a marker pen to indicate the contours of the hole.
  • Fix the tile on an even surface.
  • Drill holes in the corners of the intended rectangle.
  • Using an angle grinder, go around the contours of the marked rectangle.
  • Remove the inner part.
  • Finish off the edges with an abrasive.

Cut circles (circular holes)

Before you cut the tiles with an angle grinder, you must drill a center hole. For this you must use a carbide drill bit with a diameter of 3-4 mm.

  • Mark the center point of the circle on the tile with a marker.
  • Use a compass to trace the outline.
  • Drill a hole in the center point with a drill.
  • Use an angle grinder to make vertical notches from the center to the outer edge of the circle, crosswise.
  • Cut off excess material, trim the edges with an abrasive stone.

Cut at a 45° angle

To do a quality job in this case, you need to use a metal disc with a diamond coating.

  • Draw a marker line for the trimmer cut at an angle of 45 degrees.
  • If possible, fix the material face downwards.
  • Make the first cut with an angle grinder.
  • Repeat if necessary to improve the result.

Important! When cutting the tiles at an angle of 45 degrees you need not reach the glaze 1,5-2 mm, that is, cut only the clay.

Can I use the angle grinder for cutting metal tiles and corrugated board?

At a time when they just started using metal tile and decking, the instructions stated that the use of angle grinder for cutting these roofing materials is strictly prohibited. This is explained by the fact that on both sides they are protected with zinc and polymer coatings and painted.

The abrasive disk heats up and melts the material. The cuts are jagged. Flying sparks also damage the paint. All this causes corrosion of the material and reduces the service life.

Nevertheless, in recent years, builders began to apply for this work angle grinder. This greatly facilitates the work, it can be done directly on the roof. After cutting, the edges should be treated with corrosion protection agents, primed and painted.

Correctly cut metal with an angle grinder is not very difficult. Everything can be learned. The main thing. to observe safety rules and follow the recommendations.


Sanding and polishing

  • cord brushes. roughing treatment for leveling or cleaning the surface;
  • Abrasive end bits. specially designed for sanding the ends of parts;
  • petals. special discs in the form of abrasive blades of different grit, its degree determines the quality of grinding;
  • felt (cloth) wheels. ideal for mirror polishing, including the use of a special liquid or fine abrasive paste;
  • Fibre nozzles. a good option for processing metal surfaces;
  • chain saws and solid wood chisels should be used exclusively with bolsters, complete with additional handles, allow for rough treatment of logs, timber, and other types of wood.

Cutting discs for angle grinders: the right choice for safe work

Almost all construction electric tools are multifunctional, and they owe this to special attachments, each of which has its own properties, technical characteristics, purpose. For example, numerous drills, peorators, as well as different types of cutting discs for angle grinder (angle grinder) or “angle grinder”, as it is also called by users.

This name appeared in the seventies, when the first samples of such tools were produced in Bulgaria. Equipped with a powerful motor, such a machine, of course, does not only perform the grinding function, it cuts and processes hard materials. metal and stone.

Among my readers, there are probably people who are preparing to buy an angle grinder, as well as those who have already purchased the tool and are trying to figure out the attachments. I want to help everybody at once, simplify the task and tell you about numerous cutting-off wheels as the most popular attachments of this machine, which, quite possibly, you will have to buy additionally.

To do this, you need to find out exactly what kind of work is performed with an angle grinder, and the types of attachments used for them. Cutting work accounts for over 70% of all work with the angle grinder. It cuts almost any material: from metal to wood, but when choosing be sure to read the instructions, because there are models of tools and cutting discs that do not perform certain functions, such as cutting stone.

Cutting discs are divided into abrasive and diamond. Abrasive cutting wheels are most commonly used for metal and stone. How to find the right one for you?

Getting your hands on the cutting wheel, you will find on its front side quite extensive information. First, you will see the specific specialization of circles, because they are designed not only for steel, but also other materials, including non-ferrous metals, as well as cast iron, stone, porcelain. There are also universal versions.

Also here you will see data on the maximum operating RPM, the useful life of the cutting wheel, dimensions, and more specifications.

The label of the wheel shows the outside diameter and the inside diameter (fit), which is often 22.2 millimeters. The outer diameter should be chosen according to the class of angle grinder, e.g: 115, 125, 150, 180 or 230 mm. Never fit a cutting wheel larger than the specified diameter on an angle grinder, it is fraught with danger.

The disc thickness has a big influence on the selection, because it determines how it can be used for the specific application. Standard thickness 2.3 to 2.5 mm at 125 mm diameter. Work with thin discs (1-1,2 mm) quickly and easily enough, the material heats up less. Thin discs do however wear down severely. To minimize abrasion, select the thickness of the blade according to the thickness of the metal to be cut, so that the work is more productive and lasts longer.

(Meadow’s thin metal disc)

When working with thin discs, be especially careful to follow the rules. Although the abrasive material of the metal cutting wheel is reinforced with reinforced mesh with special technology, never remove the protective cover from the angle grinder, wear special clothing, do not force the wheel. Observing all standards, you can safely cut thin circles sheet metal, pipes, profiles of different configurations, angles, rebar.

How to determine the shelf life of a cutting wheel?

Let’s break down what this inscription on the label means: V 04/ 2016. It is usually embossed on a ring of metal around the seating hole. This designation indicates the quarter and year until which the disc can be used. With the year everything is clear, but the quarter of the denoted by its first month: V 01 (January). 1 quarter, V 04 (April). 2 quarter, and so on. Do not buy an expired product for safety reasons, do not leave discs lying around the house idly, buy them by the time of work.

Marking of cutting wheels

There is a lot to say about specifications and marking of cutting wheels, but some manufacturers have tried to describe everything in detail on their websites, giving information on specific types of wheels. So we will take a look at one example to decipher the four-digit code on the label.

The four-digit code “A 30 S BF” means: A for aluminum oxide (grain material). if there is a designation AS, it is white electrocorundum that is free from chlorine, sulfur and iron, which is important for cutting stainless steel. C stands for silicon carbide. grit for stone cutting circles. The number 30 (sometimes 24) is coarse grit for cutting steel, for non-ferrous metals it is 40 or 60.

The following symbol, in this case S, indicates the hardness of the bond. The harder the number in the alphabet, the higher the number in the alphabet. Here is the important point: you need to find the ideal ratio between the hardness of the bond and the toughness of the metal being cut, because they are inversely related.

angle grinder thin disc cutting speed and wear comparison makita flexovit pferd

During cutting, grains that have blunted should fall away, crumbling, giving way to whole cutting particles of abrasive. But if the bond is too hard, the cutting disc, as experts call it, “gets greasy” and starts to cut badly, overheats the workpiece. If the bond is too soft, the disc will quickly wear down.

And the last code designation. BF. is bakelite, the grit bond material.

With such a task as cutting and processing of concrete, ceramic granite, stone, asphalt cope cutting diamond and abrasive discs for angle grinder. It is well known that on the hardness scale diamond leads, so the ends of steel cutting discs for dense materials are covered with diamond crumbs mixed with metal particles.

Diamond discs for different hardness of materials can be sectional. for slate, brick, tile, marble, as well as non-sectional. for granite, concrete, stone. When choosing them, decide what kind of material you are going to work with. Thickness of diamond discs 1,3. 2,2 mm.

Abrasive cutting-off wheels are universal, they cut not only metal, but also stone. They are made by pressing several layers of fiberglass mesh in an abrasive compound and then baking in an oven. Cutting-off wheels are also available without reinforcement, but are not used for hand-held angle grinders. It is the mesh that reduces the risk of a disc rupture at high rotational speeds.

wheel, metal, angle, grinder

Tips for Beginners

For beginners, before using an angle grinder, it is advisable to study the instructions, as well as remember a few lessons from the experts.

  • Cut thick-walled parts and workpieces in a straight line.
  • When machining long workpieces, the cut starts at the hanging edge.
  • After you finished cutting metal with the angle grinder, the edges are treated with rust preventive compound.
  • Concrete, granite and ceramic can be cut with stone discs.
  • Cutting of gas cylinders is performed only after removal of gas and condensate.

angle grinder. a tool widely used in professional and domestic spheres. It enables you to solve a wide range of tasks. A safe and orderly operating environment, clean disc selection and preparation of the site enables highquality cuts.

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