How to choose a cutting disc for an angle grinder. Marking of abrasive wheels for angle grinders

Among construction tools, the grinder stands out for its versatility. I changed the attachment and the cutting tool turned into a grinding tool. Can handle any type of work that requires rotational motion. Let's look at the range and purpose of one category of attachments - grinding wheels.

Types of nozzles

Nozzles for grinders differ in shape, thickness, diameter, material of manufacture and are divided into four groups:

cutting;
polishing and grinding;
for sharpening;
stripping attachments.

The most extensive and widely used group are cutting discs. The most common items purchased are consumables for working on wood, stone, metal, and diamond wheels. The diameter of the tool can be from 115 to 230 mm, thickness 1 - 3.2 mm, the larger the diameter, the thicker the disc. Special abrasives are applied to the cutting surface of the stone tool. It is advisable to use discs for wood and metal together with a device for stationary installation of an angle grinder, otherwise the work may cost several fingers. It is preferable to work with fine-toothed discs.

Diamond cutters cut any materials; they are usually used when laying porcelain tiles, tiles, and reinforced concrete. The edge of a diamond wheel can be torn or solid, and the size of the diamond particles can be larger or smaller.

Grinding and polishing wheels

Grinding perform the following types of work:

grinding;
cleaning;
stripping;
removing rust;
polishing

This is the most numerous group of attachments, which can be:

with replaceable emery wheels;
with a spongy surface;
felt;
fabric.

Most often, to work on such a paste or liquid with small abrasive particles. Primary grinding of metal is carried out on wheels with a low-abrasive surface, finishing - on felt and fabric wheels. The various surfaces of grinding wheels allow you to bring the material being processed to any degree of smoothness, be it metal or wood. They are so convenient that they are used in car repair shops to polish car bodies.

cup;
petal;
fiber;
brush cord.

Flap attachments are designed for wood processing, for example, peeling off old coating.

Cup wheels are used when working on concrete and stone, less often on metal. A low-power angle grinder will not cope with such a tool and will quickly burn out. Therefore, they are installed only on powerful angle grinders. In addition, the curved shape allows you to get to hard-to-reach areas. Grinding is done more carefully, since the fixing nut does not stick out.

Sharpening discs and roughening attachments

sharpening abrasive discs;
twisted cones;
roughing diamond.

Abrasive grinders are used for sharpening tools and cleaning welding areas. They are quite thick (from 5 mm), on inner surface there is a recess. An example is fiber discs, which clean welding areas from scale and remove traces of oxidation well. Diamond grinding attachments only work on stone or concrete.

Twisted rollers, also known as metal cord brushes or wire brushes, differ in size, shape, and maximum rotation speed. Most often they are used to remove traces of metal oxidation and brush wood.

Selecting a grinding wheel

When choosing a circle for an angle grinder, the following points are important:

The diameter of the disk must correspond to the maximum allowable for a particular tool. Otherwise, the consumable may be destroyed due to exceeding the maximum permissible rotation speed. The power of the tool may not be enough to rotate a large circle. When using a large diameter, it is necessary to remove the protective casing, and this is dangerous to the health of the worker;
material to be processed: it is advisable to prefer specialized discs to universal ones, for example, for wood;
maximum permissible linear speed: information about it is printed on the packaging or lateral surface consumables. The grinder's operating mode is selected depending on this indicator.

Review and testing of the sanding disc, making a felt disc with your own hands:

If you are a man with hands and you have an angle grinder, consider yourself lucky.

With its help, you can do a lot of things, improve your life, and save a lot of money.

However, for successful work you will need not only the grinder itself, but also the discs for it.

There are different types of discs for grinders - for working on wood, metal, for removing rust and many other things.

The official name of the grinder is an angle grinder, or angle grinder.

It is called that because it was originally used to work with inaccessible internal large-sized parts in production.

Later they began to use it for other work, mainly cutting metal and stone materials.

Most types of grinder blades are also designed for cutting.

Bulgarians are different. Their disks have different sizes - the smallest is 115 mm in diameter, the largest is 230.

Most often, tools with 230 and 125 mm discs are used. They are easiest to find on sale. There are reasons for this - the smallest discs with a diameter of 115 mm wear out very quickly, they have little working power, and a significant part of the diameter is eaten up by the dimensions of the tool and the mounting hole.

Therefore, where it is necessary to perform precise work, holding the grinder with one hand, use a tool for the 125th disc. And if you need to cut a lot, for a long time, and thick material, you need a powerful tool with high performance. This is exactly what an angle grinder with 230 wheels is like.

All disk sizes:

230 mm
180 mm
150 mm
125 mm
115 mm

During operation, the disk is ground down and its diameter changes. This can happen until the disk breaks or until its diameter becomes smaller than the diameter of the angle grinder body.

A disk of a smaller diameter can always be placed on a grinder of a larger standard size. This happens because all grinders have the same diameter of the mounting hole - 22.2 mm. And the thread of the stud for fixing is the same - M14.

There are disks and larger diameter. However, they are not intended for grinders. A more powerful tool can be hand-held, but more often it is used for machine tools, concrete cutters, and other machines not intended to be held in.

Large discs have a higher cutting speed and longer service life, but they are more likely to break, which is why they are not intended for hand tools- too dangerous.

There are other manual ones that, in principle, can use types of discs for grinders and grinding surfaces.

These are so-called concrete grinders.

They can use discs with a diameter of 230 mm. However, their main goal is to work not with the radial surface, that is, with the edge of the circle, but with its plane. The main consumable for them is cup grinding wheels.

Combination discs have grooves along the edges of a curved shape. They remove dust from the cutting area. They can be used for all types of cutting, they are more productive than others, but they have more wear per meter of cut.

Wood discs and safety precautions

You can find many other grinder discs on sale - for example, numerous types of grinder discs, for cleaning concrete seams, for polishing, etc.

The discs themselves are not dangerous for the worker, but they can damage the tool - if the grinder is used with a load not radial, but along the axis of the disc, its bearings fail. Repairs won't be cheap.

There are some other types of discs, the use of which is not harmful for an angle grinder. These are discs with a brush, located radially, and discs with petals of sandpaper, also located. However, they can be used if their width is small. In principle, any discs can be used with concrete grinders, but this is no longer an angle grinder.

The video provides an overview of grinder wheels:

What are the diameters of discs for grinders?

At the moment, manufacturers of consumables for angle grinders supply the market with circles whose diameter ranges from 115 mm to 230 mm. More precisely, tool owners are offered attachments with diameters of 115 mm, 125 mm, 150 mm, 180 mm and, of course, 230 mm. Such dimensions are optimal for performing amateur or repair work private houses and apartments. Despite the fact that the seat diameter of any grinder disc is usually 22.2 mm, attachments of different sizes are designed for different cars, and this is explained by varying power. It’s easy to guess that 115-125 mm discs are intended for low-power grinders, 150-180 mm for medium-power grinders, and 230 mm for high-power grinders (over 1500 W). It is worth noting that there are circles with a larger diameter, but they are usually used on industrial enterprises, since they are part of stationary machines. It is not recommended to use large discs at relatively small angles grinding machines, as it is unsafe and may have negative health effects.

Dependence of disk thickness on its diameter

Those who are going to carry out work of one kind or another need to know that the diameters of the discs for an angle grinder are also reflected in their thickness. For example, if a thin, neat cut is required, it makes no sense to use an impressively powerful grinder with a disc larger than 230 mm, since its thickness is over 3-4 mm. But if we are talking about cutting railway rails or thick pipes, then, on the contrary, using a disk of medium thickness (about 1.6 mm) is not rational, since it will probably lead to its destruction and the lack of results. In other words, in each individual case it is important to choose a nozzle of the correct diameter and thickness, and also to work with an angle grinder of the appropriate power.

If you are in doubt about choosing a disc for an angle grinder, or have difficulty deciphering the markings, just fill out the form on the website or call the specified contact phone number, and our managers will help you make your choice. Wide range diamond blades presented in the diamond blades section

trio-diamond.ru

Grinder discs: how to choose a grinding wheel, what types there are

Even the most powerful modern instrument useless without additional replacement elements. Therefore, to perform the work professionally, it is important to know what kind of grinder wheels there are. It is these details that make the tool multifunctional.

With the help of a grinder, cutting, grinding, sharpening, polishing, and peeling operations are carried out. However, manufacturers offer such a wide range that it is easy to get confused. Information about their classification will help you figure out how to choose a circle for an angle grinder. It is given in regulatory documents.

Which cutting wheels for metal, stone and wood are better?

A grinder (angle grinder or angle grinder) is most often used for cutting work. To receive good result You should decide which cutting wheels for metal are better. It is necessary to carefully select these parts for cutting brick, wood, and slate. However, these parts of angle grinders are mainly used for cutting metal sheets or pipes and other metal products.

You can choose cutting wheels for a grinder for metal, the sizes of which vary, as follows:

small diameter discs 115 and 125 mm - suitable for grinders small size;
discs with an average diameter of 150 and 180 mm - suitable for grinders standard sizes;
discs with a large diameter of 230 mm - suitable for very powerful, professional grinders (power 1500 kW and above).

The internal diameter of the disc for all the categories listed above is the same and is 22.2 mm. The thickness of the circles also varies and ranges from 1–3.0 mm. Large diameters of discs for an angle grinder imply greater thickness and, accordingly, vice versa. This dependence is determined both by the speed of rotation of the circle and the load on it. Do not cut a thick sheet of metal with a thin disc. As a result, it may simply break during operation.

Various disks are used for various types metal For cutting body steel or aluminum, a thickness of 1–1.6 mm will be quite sufficient. And for thick metal channels you should choose this parameter from 2.5 mm. The average consumption of cutting wheels per ton of metal (diameter 115 mm) is 73–171 pcs.

Diamond blades for grinders are used for cutting stone, as well as slate, concrete, and brick. Ceramic tiles, paving stones, and porcelain stoneware are no problem for them either. They are steel circles with a mounting hole and a special coating on the edge. The basis of the spraying is diamond grains 0.2–0.8 mm in size.

Ordinary stone wheels without diamond coating are significantly cheaper. However, they can no longer cope with cutting concrete or tiles due to the lack of cutting edge. Diamond wheels are divided into the following types:

For dry cutting. The circle along its entire perimeter is divided into small fragments - transverse grooves with teeth. This allows it to cool faster and more significantly. Diamond teeth are made separately and then soldered to the blade of the disc. To do this, laser welding and silver solder are used. It is important to remember that you cannot operate such a disk continuously for more than 2 minutes. It is designed specifically for cutting brick, paving stones, and concrete.
For wet cutting. Its purpose is to cut ceramic tiles and porcelain stoneware. It has a solid structure, and before cutting the material must be moistened with water. Features circle - flattened side edge and additions of cobalt and bronze. Products with an admixture of bronze are well suited for cutting drywall, tiles, and ceramic tiles. But the cobalt additive will help cope with quartzite, granite, and labradorite.
Combined. This circle combines the characteristics of the first two and is considered universal.

The seat size (inner diameter) for all diamond blades is 22 mm. Wet cutting wheels are often installed on tile cutters - power machines with water supply. In this case, the diameter can reach 25.4 mm.

Purchase the one you need diamond blade very simple for an angle grinder. Products are marked depending on which material is best for cutting.

Grinder discs for wood are considered the most dangerous. When working with them, it is better to use wheels with fine teeth. It is also not recommended to remove the protective casing from them under any circumstances. Forceful force during operation can cause serious injury. Therefore, it is better to avoid installing such disks on large angle grinders. The most suitable option is to combine them with a device for stationary mounting of an angle grinder.

If you don’t know how to remove a disc from an angle grinder, read our post.

The sizes of circles for wood coincide with those for metal. When choosing them, it is worth considering the following features:

It is important to determine the disk size as correctly as possible. It depends on the depth of the wood cut and its texture.

Special significance have the characteristics of the disk teeth: their number, shape and frequency of placement. Models with teeth beveled at different angles are “sharpened” for any type of wood. For cutting soft coniferous wood, it is better to purchase wheels with straight teeth. With chipboards medium density Trapezoidal teeth work well.

It is preferable that optimal thickness circle on wood was at least 2 mm.

How to choose a quality grinding wheel?

There are now many grinder wheels on the market designed for grinding and polishing surfaces.

The most popular are sponge, felt, fabric discs and discs with replaceable sandpaper. The grinding and polishing material is fixed to the base using glue or Velcro.

Grinding and polishing wheels have different design and are solid, movable and petal-like. The choice of product is determined by the required degree of surface smoothness. To give ideal evenness to the wood at the end of processing, flap wheels are mainly used. They come in flange and spindle types.

Inexperienced craftsmen are often interested in how to choose grinding wheel in an optimal way. Such discs have varying degrees of grain depending on the specifics abrasive material. The fine-grained material has proven itself well in polishing wood. Medium grit wheels are often used to remove the top layer of wood. Coarse discs are an excellent choice for removal old paint.

The grain size must be indicated on the product. The larger it is, the faster processing will occur. However, it is worth remembering that the cutting or grinding quality of coarse-grained wheels is worse. Manufacturing companies also indicate the hardness of the disc base ligament. When processing soft materials, it is recommended to use a soft bond.

For stripping metal and stone surfaces Special discs for grinders have been developed - twisted cutters. They are made in the form of steel cups, along the perimeter of which wire brushes are fixed. The diameter of the wire varies and is determined by the roughness of the surface treatment.

Dimensions and other parameters of abrasive wheels

Abrasive wheels, the same size as other discs, are quite common. They are created both for cutting material (product thickness does not exceed 3 mm) and for grinding (product thickness from 4 to 10 mm). Reinforcement for cutting wheels is usually carried out in 2 layers, and for grinding wheels - in 3 layers. Also in the first case, the inner seat ring of the disk is made of hard metal. For abrasive grinding wheels, it is quite acceptable to use a softer washer.

Abrasive discs have a flat or curved shape. Dish-shaped models are suitable for processing hard-to-reach areas. They are much easier to use during sanding thanks to the hidden locking nut.

The LLC TVK UKRABRAZIV plant serially produces cutting discs for angle grinders with a diameter of 115 to 230 mm and a thickness of 1 to 3 mm. As well as cutting discs used on stationary grinding machines with a diameter of 300 to 400 mm. and thicknesses from 3 to 4 mm.

The plant’s assortment also includes cutting discs for high-alloy steels with a diameter of 125 to 230 mm and a thickness of 1 to 1.6 mm. And cutting discs for stone with a diameter of 125 to 180 mm and a thickness of 2.5 mm.

Regarding grinding discs, then the plant produces grinding discs on a bakelite base of straight and disc profiles with a diameter of 125 to 230 mm. 6 mm thick. As well as flap grinding discs with a diameter of 125, 150, 180 mm. Using abrasive paper based on normal corundum (STANDART and PREMIUM quality) and zirconium corundum. Corundum grain 36, 40, 60, 80, 100, 120.

The consumable tools TM SPRUT-A and TITANIUM ABRASIVE for grinders produced by the plant, used in everyday life and industry, differ high quality. Therefore, the buyer can only buy a product that is optimally suited for his purposes.

ukrabraziv.com.ua

Disc sizes for grinders

One of the most frequently used and irreplaceable tools on the farm is the grinder, since it is the one that performs a wide range of repair, construction and other types of work.

When working with this tool, it is important to know what disk sizes are needed in each specific situation in order to make the work process faster and better, and also not to harm the grinder itself.

You need to know that grinder discs can vary not only in diameter, but also in thickness - 1-3.2 mm. The diameter can be as follows: 115, 125, 150, 180, 230 mm. These disc variations are designed for different sizes grinders, disc rotation speeds and workloads on it. Here you can buy an angle grinder by receiving quality tool for a reasonable price.

Discs for “small work”

Grinders with a 115 mm cutting disc are best used for simple work that does not require heavy tool loads. For example, a 115 mm disc is perfect for grinding.

For small metal work, you can use a 125 mm disc. This size is considered the most popular, as it is relatively inexpensive and you can find it on sale large selection various kinds nozzles

Uncommon sizes

If we talk about diameters of 150 and 180 mm, then they are called the most unpopular. A 150 grinder, for example, can be used for both cutting and grinding, but for these purposes it is still better to choose discs of other sizes. In turn, the 180 does an excellent job of cutting metal.

Heavy artillery

A 230 mm disc is ideal for cutting metal and brick, which is simply irreplaceable when working with large parts.

In conclusion, I would like to say that there is no such disc for an angle grinder that can serve as a universal tool on a construction site. For each type of work you need to select “your own size”, and then the result will please you.

teplica-parnik.net

What discs can be used on an angle grinder? 1

The main spare part of an angle grinder (angle grinder) is a replaceable cutting tool. An abrasive disc rotating at high speed cuts, grinds or polishes materials. For metal processing, circles are made from abrasive chips; for wood, steel cutters are used; for stone, metal discs coated with diamond are used. Special attachments - brushes, petal sanding wheels additionally expand the capabilities of your grinder. Next, we will find out what types of discs there are, how to properly remove the old one and install a new one, and also consider possible problems problems that arise during the replacement process, and ways to solve them.

Types of discs for grinders: how to choose the right one

The industry produces grinders and wheels for them in standard sizes: 115, 125, 150, 180 and 230 mm. Angle grinders from 180 mm are used for cutting stone. The most common size of machines for home and garden use is 125 mm; they produce the most discs and attachments for them.

Attention! Always select a disc that matches the size of your angle grinder. A disc of a smaller diameter can be installed in an angle grinder. But removing the casing and installing a disk with a larger diameter is extremely dangerous!

We suggest dividing the discs according to their purpose: cutting, grinding, sharpening and roughing. Let's look at each type in detail.

Cut-off

Cutting through metal

Inexpensive steel disc from Luga plant

Cutting materials is the most common task during repairs and construction; a simple abrasive wheel for metal will easily cut through a steel bar, roofing iron or plastic. These wheels are made of corundum (crystalline alumina) or electrocorundum (synthetic corundum).

Sawing stone

The budget stone disc is produced by the Luga plant

To cut stone, we recommend taking a special disc - they use a different abrasive - silicon carbide. He can handle white sand-lime brick and slate. Here's a red brick tiles and especially concrete - they won’t succumb to it - you need to take a diamond disc.

Letting go of the tree

These are also available for grinders

Wood cutting discs look a lot like blades circular saw. Actually, this is a disk for a circular saw, only the mounting diameter of 22.2 mm is suitable for the spindle of an angle grinder.

Diamond

As you know, diamond is a very hard mineral, so diamond discs can easily cope with red brick, porcelain stoneware, and tiles. The main material that is cut with diamond blades is concrete.

Diamonds must be handled with care - the disc cannot be used to cut steel, and it must not be overheated. After just two minutes of sawing concrete, the disc will become very hot - take a break. Slots are made around the circumference of the dry cutting disc for cooling.

They produce discs for wet cutting of ceramic tiles and porcelain stoneware. The water cools the disc and washes away dangerous dust.

How to choose the thickness of cutting discs

Every master knows that the thinner the tool, the better. Less material goes into chips, it’s easier to saw, and the cut comes out cleaner.

Discs for grinders 115 and 125 mm are produced with a thickness of 1.0–2.5 mm. Discs 150 and 200 mm - thickness 1.8–4.0 mm. Pressed corundum powder is reinforced with synthetic mesh.

Attention! The thinnest disk (1.0 mm) “walks” when sawing and breaks easily, its pieces fly at high speed in all directions. Don't forget to protect your eyes and hands.

Grinding

The next most important job that craftsmen entrust to an angle grinder is grinding and polishing. Similar processing is applied to metal, wood, plastic and other materials.

Flap wheel for wood: dozens of sanding flaps quickly cut off chips

The choice of grinding discs is very wide. If you are restoring a sideboard, a flap wheel is suitable for removing layers of shellac. It covers large surfaces and cuts a lot of material in one pass.

The sanding attachment is a plastic circle to which sandpaper is attached with Velcro

Another attachment is screwed onto the grinder spindle. Sandpaper is attached to it with Velcro. For coarse processing - P60 or P80, for finer processing - P120 or P180. As the grain size decreases, grinding smoothly turns into polishing.

Polishing disc made from alpaca wool

Especially for polishing, there are attachments in the form of pads, felt or fabric discs. Before work, polishing paste, for example, GOI, is applied to them.

Grinding wheels

In fact, there are special machines for sharpening tools - sharpeners. Nevertheless, the rotating disc of the grinder is capable of correcting a dull ax or cleaver, knife or scythe. Taking into account the wishes of the craftsmen, the industry produces 115 and 125 mm sharpening discs for grinders.

Sharpening discs turn the grinder into a sharpener

The discs are made of coarse abrasive, compressed into a thick plate (more than 5 mm) with a bulge in the center. If you install such a disk on a spindle, the flange is hidden in the recess and does not protrude above the plane of the disk. Coarse grinding wheels are also used for cleaning welds.

Sanding brushes and discs

Craftsmen renovating mid-century homes are faced with the removal oil paint from the walls. Wire brushes are suitable for this type of work.

Not a single paint can resist such a steel cup.

The brush is a cup with steel or brass strands around its circumference. They differ in the thickness and rigidity of the wire - for coarse and fine stripping. The brush is screwed onto the spindle using an M14 thread.

Stone grinding disc cuts old cement evenly

After removing the oil paint, the curved concrete wall must be sanded. Only a grinder can cope with such a task. The working surface of the diamond grinding disc is perpendicular to the axis of rotation. Synthetic diamonds cut and smooth concrete like sandpapering wood.

How to make a replacement

It’s already inconvenient to cut with such a disk

Grinder discs are a consumable material; when cutting, they wear out quite quickly. A worn out disk must be replaced. Let's see how to do this using our Interskol-115 angle grinder as an example.

Attention! Before work, make sure that the machine is disconnected from the electrical network!

Step by step instructions

The disc is mounted on the spindle of the angle grinder with a clamping flange with an M14 thread. To unscrew the flange, the grinder kit includes an open-end wrench. Its pins cling to the flange holes.

An open-end wrench will unscrew the flange

To unscrew the flange, the spindle must be locked. To do this, a clamp is made on the side of the case opposite to the disk. When you press the button, the cotter pin enters the hole in the driven disk of the gearbox and prevents the spindle from rotating.

The button locks the spindle

Insert the open-end wrench into the flange holes. Right hand press the lock button, at the same time turn the key counterclockwise with your left hand and remove the flange from its place.

An open-end wrench is inserted into the flange holes

Our grinder rotates clockwise. If your direction is different, remember - you need to unscrew in the direction of rotation of the disk.

If the flange gives way, unscrew it by hand, remove it and put it aside.

Top flange removed

Filming old disk. We don't need it anymore, we can throw it away.

Old disk removed

Remove the bottom flange.

Bottom flange removed

During intensive sawing with inside the casing is formed by hardening from burnt particles of metal and abrasive. Let's use a steel brush to clean the casing.

The brush cleans the casing

We install the lower flange on the spindle, making sure that the flats on the flange coincide with the grooves on the spindle. Place a gasket on top.

Bottom flange and gasket installed

If your grinder does not come with gaskets, such a washer can be cut out of cardboard or tin.

We put the disk in place and cover it with the second gasket.

New disk installed

Thanks to the gaskets, if the disc gets stuck in the material and breaks, you can still easily unscrew the flange.

We tighten the upper flange by hand against the direction of rotation of the wheel (in our case, clockwise), holding the abrasive disc. With your right hand, press the lock button and twist it by hand until you feel resistance. Insert the open-end wrench and tighten it a little more, no more than a quarter turn. There is no need to tighten the flange too much; the disc will warp.

The disk has been replaced, the angle grinder is ready for work

At this point, the replacement of the disk is completed, you can continue sawing. Sometimes when changing a disk, obstacles stand in the way of the master. We will consider what to do in such situations further.

Video: how to remove the old and install a new drive

Possible difficulties in the process

What to do if there is no key

The open-end wrench is not attached to the grinder and may well be lost. How to unscrew the flange in this case?

We make an open-end wrench from a nail. Take a weaving nail and bend it in the shape of the letter “P” so that the distance between the vertical posts is equal to the distance between the holes in the flange. Cut off the tip and head with a hacksaw. We stick the resulting “key” into the holes of the flange and unscrew the mount, not forgetting to fix the spindle. If the nut is tightly tightened and your fingers are not strong enough, insert another nail between the vertical sections - the lever will be greater.
We use the gas key. We take a large pipe wrench, it is also called a “gas wrench”. Plumbers use this tool to twist steel pipes. We spread the key so that it covers the entire flange. We try to move the nut from its place, securing the spindle. The gas key has a huge leverage. If you apply force, the spindle lock will break.
Tapping the nut. Take a metal rod or thin chisel. Lock the spindle. Tap the edge of the hole in the flange in the direction of rotation of the disc. This way you can move the nut out of place. This method is not the safest: the tool damages the flange and breaks the key holes.

The disk is broken, the flange is jammed

Let’s imagine that a craftsman is making an anvil from a steel rail and cutting out the tip with a grinder. The disk became distorted in the material and jammed. The motor continues to run and tightens the flange tightly. All work stopped. How to change the disk if now it does not unscrew?

Let's disassemble the gearbox. Unscrew the fastening and remove the gearbox housing. We hold the spindle shaft with a gas wrench or pliers, and twist the flange with a horn or another gas wrench. The disc is not affected by this method; the normal one can also be removed. good disc. The method works even if the spindle lock is broken.
We use two gas keys. The method does not require disassembling the grinder. Carefully break out the remains of the disk to get to the bottom flange. We clamp the upper flange with the first gas wrench, and engage the lower flange with the second key. We twist in opposite directions.
Heat the nut with a torch. We heat the stuck nut with a portable gas burner. The nut will expand as it heats up and can be easily unscrewed.
Cut the flange with a hacksaw. Some craftsmen prefer to cut through a stuck flange with a hacksaw. The method is barbaric - you will have to buy a new nut.
Lubricate the threads with penetrating lubricant. Spray the stuck nut with WD-40. It penetrates into narrow crevices and threaded connections. After a five-minute break, try to move the nut with a wrench.
Cut out the remaining disk with a hacksaw. We break the disk with pliers while it is possible. We remove the protective casing, insert a hacksaw into the gap and cut out the remains of the abrasive wheel. Delicate and reliable method. Does not require disassembling the grinder and harsh influences on the tool. The master must have patience, as the method will take up to an hour. The abrasive quickly wears out hacksaw blades; you will need several of them. The advantage is that the angle grinder maintains the warranty, there is no risk of breakdown.

Video: how to change an angle grinder disc if the key is lost

What are cardboard spacers used for?

It's very simple and very important. To ensure that the flange can always be easily unscrewed, a gasket must be placed between the abrasive disc and the flange. Or two - on each side of the disk.

These circles ensure that the flange does not get stuck

Such discs can come complete with an angle grinder, or you can cut them yourself.

For spindles of angle grinders, factories produce thin and thick abrasive discs, metal cutting wheels, nylon brushes. All these spare parts turn the angle grinder into universal tool and reveal its capabilities from an unexpected side. For example, a grinder turns into a sharpener. Changing the disk is not difficult, but the technician must know about some features of the process so as not to get into a difficult situation.

(angle grinder) – the so-called “ Bulgarian"- is one of the most common and universal tools available in the arsenal of professional and home craftsmen and used in construction, production, and at home. The functionality of the grinder is expanded by sets of consumables - all kinds of disks and attachments for various operations using rotational movements tools: grinding, polishing, roughing, cutting, sharpening, cleaning, etc.

For example, in the case when the surface area being processed cannot be perfectly lined, the problem of cutting ceramic tiles arises. If you have a tile or glass cutter on hand for thinner materials, no questions will arise, but what if it’s just a grinder? We should immediately make a reservation: cutting tiles is not at all a specialized functionality for an angle grinder, but by choosing the right cutting wheel, you can cope with this task.

Construction of abrasive wheels

Cutting wheels for grinders represent a surface round shape with a central hole reinforced with a metal ring for fixing the tool itself on the spindle. The working surface of the disc is made of abrasive particles held together binder composition. The characteristics of the abrasive, primarily its hardness and grain size, affect the quality of the work performed. Abrasive chips can be made:

from zirconium corundum and electrocorundum;
silicon carbide;
aluminum oxide and others.

To ensure additional strength and safety during manufacturing, the disc is laid in several layers synthetic reinforced mesh.

So, various abrasive discs are used for processing metals, finishing natural and artificial stones, brick, concrete and ceramic tiles. To somehow organize all the variety of attachments for an angle grinder, use generally accepted classification and labeling.

Types of cutting wheels

This type of replaceable attachments for an angle grinder is perhaps the most common among others, since various types of cutting work account for two-thirds of the total volume. As a cutting element, cutting discs are used when working:

for metal— the thickness of such a disk, due to high torque and serious load, is proportional to its diameter and can be 1...3.2 mm with a range of external diameters of 115 and 125 (for small angle grinders), 150 and 180 (for medium ones), 230 mm (for grinders with power over 1500 W);

on stone– such circles are used for sawing concrete, brick, slate, paving stones, ceramic tiles and metal granite (one of the types of diamond blades);

woodworking– discs of this type have different sizes of cutting segments and special notches instead of grooves (I would like to note that this type of disc is extremely dangerous in operation, due to the high speed of the grinder);

stand in a separate class diamond discs with application of diamond coating on the outer cutting layer. Diamond wheels are used for dry (segmented blade type) and wet (solid blade type) cutting, as well as combined type cutting. Cutting materials can also vary, from stone and metal to plastic and rubber. Read more about diamond discs.

You should also distinguish between disks for professional work and household use. Suitable for one-time household work on bricks and tiles inexpensive options from "Sparta" or "Tsentroinstrument". Professional circles (for example, Distar or Bosch) are 3-4 times more expensive than household ones, but their durability is approximately the same. Such discs are clearly graded according to the type of material - marble, ceramic tiles and porcelain stoneware, for concrete and reinforced concrete, fire-resistant. It is highly recommended to use professional discs for their intended purpose. Standard diameter sizes from different manufacturers vary from 115 mm to 350 and 400 mm.

Grinding and polishing discs

Depending on the type of material being processed and the required quality of its grinding or polishing, discs with different working surfaces are used:

sponge or fabric– are used, as a rule, in combination with special pastes or liquid means;
felt solid or performed on plastic base with many transverse, densely planted felt petals, also used with polishing pastes;
discs with replaceable sandpaper of different thicknesses and finely abrasive for cleaning and grinding.

For convenient and high-quality processing of large surfaces, rough grinding of logs and rounding of the edges of various products, grinding discs of a special conical shape are used.

Grinding and polishing discs are suitable for cleaning and polishing up to perfect condition various types of surfaces: from steel to metal alloys, they are actively used in car services when processing body coatings.

Safety precautions when working with grinder discs

For anyone construction tools strict adherence to safety rules is required, and the grinder is no exception. Here are some of them:

When working with any type consumables a special shield should be used, protecting the face.
The tool must be held in such a way that the disk or attachment rotates in the direction from the worker person with him.
Should be individual for each material maintain the required rotation speed.
Don't use discs, designed to work with one type of material to process materials of another type.
Do not use the tool itself for work, not provided for by it technical characteristics , specified by the manufacturers in the passport.

If you follow these simple but necessary recommendations, the tool will serve happily for a long time, and the health of the master will not be endangered.

Let's sum it up: when choosing and purchasing discs for an angle grinder, you must first of all take into account the intended operations and types of surfaces to be processed. And following safety rules when working with them will extend the life of the attachments and tools.

The common name for an angle grinder is an angle grinder. It is mainly used for cutting metal. For example, to cut metal corner or water pipe using a hacksaw for metal requires a lot of effort, but if you install a cutting disc on the grinder, the work will be done in a matter of seconds.

Types of work where the grinder is used

This electric device is a universal tool that allows you to cope with the following types of work: cutting various hard materials (metal, stone, wood), which is the most popular area of use of this device; grind (sand, polish) various objects; cleaning the material from paint, glue, rust.

For these purposes special nozzles are used, called disks. The most popular are discs designed for cutting. They are installed on a grinder and cut, shaped or cut to any materials.

There are jobs that cannot be done without an angle grinder. For example, cut a hole in the shape of a square to make ventilation in garage doors made of metal. Of course, in addition to the specifications for different types surfaces that will be processed, there are mechanical characteristics for the discs.

The main one is disk size. With its help, the main capabilities are determined, especially the depth of cut. However, a significant diameter is not always good:

To use it, you need a large grinder. It should be borne in mind that a powerful angle grinder is required not only to ensure the seat diameter of the disc. To spin a cutter with a diameter of 230 ml, a motor with a power of 1 kW will not be enough;
A large grinder needs space. For example, cutting off a rusted exhaust manifold stud under the bottom of a car is easier with a small angle grinder that has a small-diameter disc. Therefore, many specialists leave half-ground disks to do this kind of work.

We can give another example of using a grinder disc for metal that has a small diameter. With its help you can cut reinforcement from a reinforced concrete wall, when you need to install a switch or a block of automatic machines for an electric meter. But cutting 80-inch corners to build a fence or shed in the yard can only be done with a disc whose diameter is at least 150 millimeters.

Cutting attachment device

Inexperienced craftsmen often ask: “For what kind of work are grinder discs used, what kind of wheels are there for this tool?”

The first part of the question has already been answered above. Now there will be an answer to the second part.

There are two types of circles for this tool:

abrasive;
diamond

Most common discs - abrasive. Previously, the abrasive was fragile, which is why it shattered into pieces, injuring the master, if the grinder did not have a protective casing. Now, in order to work safely, cutting abrasive discs are equipped with complex design, having multilayer reinforcement.

Between the layers of the reinforcing mesh there is a bonded abrasive made of carbide, aluminum, various corundum and other materials. The main task of solid particles is scraping away a thin layer of metal during cutting or polishing. During operation, the disk wears down and its size becomes smaller. A disc whose wear does not exceed 35% can be used effectively.

Diamond bit arranged differently. Diamond chips are applied to its outer radius using a very strong binder material. To prevent curvature when heated, expansion grooves are applied to the outer radius, acting as teeth that facilitate cutting.

All cutting attachments are marked according to the type of material:

green color (cutting ceramic, concrete, stone objects);
blue(cutting and processing of metal).

There are also cutting discs to cut non-ferrous metals, including aluminum. You can, of course, cut winged metal with an abrasive wheel, but the cut comes out of poor quality. To avoid this, specialists can lubricate the circle with soap or wax and apply water to the work area.

But it’s better to buy a special wheel for aluminum; it’s not too expensive. The abrasive used for it is silicon carbide. It will allow you to easily cut non-ferrous metal.

Pros and cons of different attachments

The abrasive wheel has affordable price, there is always a wide range and some versatility. But it wears out quickly, which is accompanied by the emission of sparks during use, which can lead to a fire.

During application appears bad smell , which cannot be weathered for a long time. This makes the tool difficult to use indoors.

Discs with diamond chips do not cause sparks, strong odor almost none either. However, such a circle is afraid of overheating, so you have to take breaks during use. If a non-segmented circle is used, liquid cooling is necessary. And its price is also quite high.

Grinding disc for grinder

The second most famous area of use for an angle grinder is metal grinding. If you use attachments comprehensively and consistently, you can get a result no worse than with factory processing on a special machine (which cannot be said about a metal brush or sandpaper).

When the master is experienced, he can process stainless steel or aluminum sheet in such a way that a pattern created by traces of the work of the circle appears on them.

There are two types of grinding wheels:

petal. It acts more gently, grinds relief surfaces well, but does not cope well with removing hard protrusions;
abrasive. Needed to remove hard unevenness (melted welds, large burrs during chopping or cutting metals). It can be used to sharpen tools. If you have the skills, you can polish it flat surface, but there is a high probability of error and it is required large number time to work.

Ensuring safe operation

To everyone electric tool The kit comes with instructions for safe work. But you should remember the main rules:

It must be borne in mind that when cutting, the disk must rotate so that the sparks fly towards the master, so the grinder will not be able to bounce into his head if the disk jams.

Proper cutting of metal for economical use of abrasive. The abrasive will be consumed more slowly if you cut metal according to the following rules:

long workpieces need to be cut at the edge; if work is carried out between the support points, the circle will jam when the cut is compressed;
cutting can begin only when the disk reaches its highest speed;
Pressure adjustment should be carried out by feeling the load on the nozzle. When the speed decreases, you need to weaken the force; when it increases, the force should also become greater;
you need to enter the metal smoothly;
if the material is complex, then you can make reciprocating movements at the point where the nozzle touches the metal;
The corner should be cut in 2 steps, each side in turn. The profile should also be cut;
work breaks are needed (5-10 minutes each).

Should be sure to use water, to water the cut area with it, but you need to make sure that moisture does not get into the body of the electric tool.