How to make a cutter grinder correctly. All about the work of a corner grinder

Metal cutting technology corner grind

Corner grinding machine (angular grinder), or angular grinding grinder, as it is commonly called, an indispensable and universal tool in construction, is designed for cutting and processing solid materials. But this is one of the most dangerous types of equipment, therefore, cutting metal with corner grinding and other types of material requires all safety rules.

For proper and clear work, it is necessary to purchase a tool suitable for power and diameter of the cutting abrasive circle and functionality. You need to decide for which work the tool is needed.

For home repairs, the masters can do with a low.power corner grinder, and for professional construction you will need serious multifunctional equipment.

Low.power units are connected to a 220 V household outlet, powerful ones are connected to an industrial three.phase network, with a capacity of 380 V. In low.power Bulgarians, the disk often jams, when cutting thick metals, this is dangerous because the device can break out of the hands, injure, or break the disk.

Advice to beginners to buy a corner grinder for a 125 mm disk with a capacity of 0.8–1 thousand. W and the number of spindle revolutions 10 thousand. about./min. This power is enough to cut iron.

Used for cutting metal, stone, glass, as well as with this apparatus, they make a peel, grinding and cleaning. Having fixed it stationary, it is easy to drag incisors, jail knives, etc. D.

When choosing a corner grinder, it is necessary to pay attention to that it lay comfortably in the hand. The quality and safety of work also depends on this. If possible, you should choose a model with rubber handles.

Choice of a disk

For each type of robot, a certain disk is assumed, with the desired diameter and thickness. Small diameter. 125 mm, and large or often used. 250 mm. The thickness of the cut and its depth depends on the diameter of the disk.

For cutting metal, it is necessary to purchase a cutting disk with a thickness of 1 to 1.2 mm, for professional up to 2.5 mm. If it is supposed to make a figured thread on thin metal, then you will need a disk with a small diameter or worked out.

Regardless of the size of the disk, a protective coating is placed. a casing, it is used in metal cutting. During the cutting of the metal, the scattering of small particles is involved in order to avoid damage by small metal scraps, a shield is installed.

All about cutting tiles with an angle grinding machine

To begin with, the tile cutter is designed to cut the tile. For each of its varieties: thick or thin, more or less strong, you can find a suitable tool model. The main advantage of the tile cutter. it gives an even cut without chips. There is no large amount of dust in the process, the risk of ruining the plate minimum. With an angle grinding machine, everything is wrong.

Corner grinder Makita GA5030

You can cut ceramics with it, the result can be very good. But for this you have to try. It is desirable that there is a skill of working with a grinder, otherwise there is a great risk of spoiling the material. The tool will cut any cladding if you choose the right cutting disk. One must be prepared for the fact that in the process the saw will be very noisy, a lot of dust will rise into the air. a fishing line for a trim of a cut can be chopped.

Nevertheless, home masters choose exactly a corner grinder. The reason is simple: a tile, especially if it is a high.quality and a model that is well.core with work, is expensive. Buying it for the sake of decorating one room is unprofitable. It’s cheaper to trim the angle.grinding tool. You just need to learn how to handle it correctly.

What disk to cut tiles

The tool for the tool is selected for a specific material. Several varieties of discs are suitable for cutting tiles.

How to Grind Inside Corners. Welding & Furniture Making

Circles made of stone

Cutting element of significant thickness. Due to this, the cut is wide, the amount of dust during work increases. The main disadvantage is the rapid wear of the consumable. over, if chips or other defects appear on it during work, the circle is immediately changed. Otherwise, it can collapse by damaging the processed part and causing harm to a person working with him. Stone discs are the cheapest.

Steel circles

Thin equipment with different processing. For solid materials, select steel with diamond spraying. Such a cutting device easily copes with the task, for a long time does not grind. For cutting, three varieties of steel disks are used.

Safety precautions when working with corner grind

Flying sparks and heated metal sawdust can be a fire hazard, so there should not be flammable things around.

The subtleties of the corner grinder on wood

Different nozzles are used to grind surfaces. Most often, a circle is used, on which a round sheet of sandpaper is attached to a “Velcro”. The petal disk with sandpaper fixed on it is also used. It is more convenient, but the option with Velcro “reusable (with skillful handling), which is much more profitable with a large volume of production (a sheet of the skin is an order of magnitude cheaper than a petal nozzle). For grinding painted and covered with rust surfaces, brush and peeling discs are used, and to sharpen the cutting edges of the tools, respectively, sharpening.

make, cutter, grinder, correctly

Corner grinder Makita GA5030

The angle grinding machine is great for rough processing of wooden surfaces. The round nozzle grinds the surface very quickly. several times faster than the usual grinding machine. This is due to the high speed of spindle rotation (10,000-12,000 about./min). But the high speed of rotation has the minuses. This is, first of all, a large amount of noise and dust during the operation of the device. So take care of good dust. When working in the room, it is extremely desirable to connect a construction vacuum cleaner to the CGM. And if the conditions allow, it is better to grind wooden surfaces on the street.

Another disadvantage of the angular grinder is the impossibility of properly adjusting the speed of rotation (this function is in vibration grinding machines, but usually absent in the Bulgarians). Only an angular grinder with an option to adjust the number of revolutions, a variety of polishing discs on high.speed angular grinding machines cannot be set for polishing.

In general, the thin work is done by corner grinding at high speeds is much more difficult. Especially when processing the transverse cut of wood fibers. it is easy to overdo it and burn the wood (and at the same time spoil the circle of sandpaper). Do not press the tool very much to the wood, do not hold it for a long time in one place so that there are no subfalines due to overheating. And try to keep the tool tightly when working. A rotating circle with a skin (or petal disk) must be kept strictly parallel to the treated plane. The bias is fraught with damage to consumables and the processed surface.

With large.scale activities, let the instrument rest and cool. Especially if it is a household tool. Such models are not designed for operation in continuous 24/7 mode, usually a maximum of 8-10 minutes of continuous operation.

Features of the grip of corner grinder during operation

Experts using corner grinding mash were divided in opinion on how to use a corner grinder properly. Some cut in the direction of themselves, others from themselves. The choice depends on personal preferences, and is also a right.handed worker or left.handed.


Cutting technique “from yourself” involves rotation of the disk clockwise. This method is considered safer, since in the case of biting a circle, the tool jerk is made in the opposite side of the employee. The disadvantages of the method include the fact that the sheaf of sparks, as well as dust, fly to the employee.

Important! When working with metal, a sheaf of sparks has such an intensity that it can lead to a fire of clothing. Therefore, the use of refractory protection is required.

To yourself

In the case of rotation of the circle against the clock, the cut is considered correct to itself. This method is more traumatic, since when biting, the jerk occurs towards the cutter. If the corner grinder is not kept, then cuts or bruises are possible.

From the advantages, the orientation of sparks or dust is distinguished. They are brought from an employee. This reduces the likelihood of eye injury or clothing fire.

Safety precautions

The use of cutting power tools is a dangerous type of work and requires compliance with safety precautions.

Personal protective equipment can avoid injuries when working with corner grind

Individual protection means

Personal protective equipment is necessary to protect the eyes, respiratory organs and skin from damage.

Fastening parts for processing

All details before processing are reliably fixed in the vice. Also, during work, it is necessary to take into account and release the place where the part may fall.

If a large.sized part is subject to processing, then the processed area is fixed. The material itself should be stable and after cutting or grinding do not fall on the operator.

Features of the workplace

The working area of ​​the operator must comply with a number of requirements for arrangement and illumination.

make, cutter, grinder, correctly
  • For work, set a workbench or table made of non.combustible material in which the equipment is stored.
  • The working surface of the workbench should not be less than the processed part.
  • For fastening products, a vice is used.
  • The floor surface around the workbench is aligned. It should not glide or have potholes.

Important! For work do not use boxes, barrels and other objects unsuitable items.

Rules for working with tools

Before starting work, make sure that the disk is installed correctly, and the device is working. There should be no chips on the nozzle.

When working with corner grinding, it is important to perform the correct start, stop and take breaks.

  • Start. Before turning on, a cutting disk is installed on the corner grinder. It is clamped with a puck. The equipment is included in the network and launched idle for 1-2 minutes.
  • Stop. Before stopping, the tool is given to work idle and press the shutdown button.
  • Break. Breaks are performed in case of disk overheating, noise or vibration.

Rust removal

If you are faced with work such as processing steel pipes or metal products covered with corrosion, use wire brushes.

Processing in this case is carried out at relatively low speed, approximately 3,000 rpm. The principle of operation is quite simple-the brush in the same way as in other cases is kept under a small inclination, moving the reciprocating movements, without pressing the tool.


To carry out polishing work, you will need a circle with a soft cover stretched on it, which can be made of wool, felt or other similar materials.

Recommendations when polishing with a corner grinder:

  • Polishing is performed at low speeds.
  • Paste is applied to the processed surface manually.
  • The tool must be moved on the surface in circular motions.

How to cut it correctly

First of all, you need to take the tool correctly in your hands. Helpers hold a corner grinder with your right hand behind the body. In this case, the circle is located on the left, and the gearbox on the right side of the machine. With the left hand you need to hold the tool for the handle injected into the body. Right position of the handle. up. The protective casing should close the disk and hands, casting sparks from the employee. For the left, the hilt is screwed on the other side of the case, the protective casing is turning and fixed in the right position.

Tool manufacturers give three main advice on working with a corner grinder: hold hard with your hands, do not be on the cutting line, stop and not run the machine if the disk is jammed.

How and in which direction to cut everyone decides for himself, given the fact that when biting, the corner grinder throws in different directions.

Cut from yourself

This is a very good way, but it is important to observe one condition. cut from yourself, sparks under the feet. In this case, when biting the disk, the angular grinder throws off, so it is not able to harm health. In this case, a drawn fishing line for a cutting trimmer is clearly visible, moreover, the probability of doing something wrong is very small. The disadvantage of this method. sparks fly into trousers and under the feet.

Cut on yourself

There are many supporters of this method. It is only important not to forget that when conducting a corner grinder, sparkles must fly in the other direction. This minimizes the risk of biting disk. Although he always remains. Therefore, when moving the tool, you must definitely leave the cutting line.

My Fantasy Knife

Safety precautions when working with a corner grinder

The use of grinding and cutting power tools belongs to dangerous activities. Therefore, when working with a corner grinder, you need to take into account the possibility of direct or indirect action of hazardous factors:

  • cold or heat;
  • poor illumination of the workplace;
  • Strong noise, vibration from the machine;
  • Large physical activity;
  • rotating parts of the equipment;
  • falling objects (processed materials);
  • flying sparks and solid particles of parts;
  • work at height, depth or in a closed, inaccessible place;
  • The danger of electric trauma.

Minimize the effect of dangerous factors, and as a result, preserve life and your own health, you can observe the safety rules when operating devices with open rotating parts. To do this, you need to use personal protective equipment (abbreviated PPE), well fix the processed parts, choose a safe place, start and finish the work correctly.

Individual protection means

Under the name PPE, or personal protective equipment, means personal use products that are used to protect against pollution, prevent or reduce the action of harmful and dangerous factors. For most employees, this is workwear that corresponds to the profession. It usually includes trousers, jacket, headdress, closed shoes. Since the corner grinder is an instrument of increased danger, the clothes are complemented by other means of protection:

  • glasses or shields;
  • anti.noise headphones or bers (traffic jams);
  • vibration.insulating mittens;
  • respirator, especially during cutting stone, tiles, concrete or slate.

Glasses will protect from sparks, small crumbs or a sipped disk. The use of headphones or traffic jams helps to get rid of noise, which avoids difficulties after work with hearing. Mittens will protect from abrasive and vibration. And a respirator from a large amount of dust formed.

Fixing the processed parts

All details of small and medium sizes must be reliably fixed in a vice or using a clamp. When mounting, it is necessary to provide a safe place for a possible drop in cut off parts.

Sometimes it becomes necessary to process the corner grinding of large parts or structures that cannot be fixed in a vice. It can be:

In such cases, you need to make sure that the processed surface is securely fixed (stable or lies), after processing it will not lose stability, and the cut part will not fall on the employee or others. At the slightest doubt, it should be supported by stops, jacks, or confused and securely fix the slings to the surrounding metal or reinforced concrete structures.

Safety of the workplace

Regardless of where the workplace is. in the garage, in the country or free site, it must be well lit, meet the elementary safety requirements.

Requirements for the equipment of the workplace:

  • A workbench, a table, a rack, a cabinet or a nightstand for storage, as well as the placement of devices, tools for productive safe operation should be installed.
  • All real estate equipment is securely placed (attached) on the floor.
  • The surface of the workbench and the rack must be no less than the processed parts and the tools used.
  • The surface of the workbench is made of sheet steel, aluminum, and other non.combustible materials.
  • The vice must reliably clamp the processed parts. On the surfaces of the vice sponge there should be a cross notch with a depth of 0.5. 1 mm for each 2. 3 mm.
  • The vise is attached so that the processed parts are at the level of the elbow level.
  • On a closed grip, the gap between the lips should not be more than 0.1 mm. Handle and sponge. without potholes and burrs.
  • The mobile part of the vice should not fall when completely twisted and move smoothly, without jerks.
  • The floor is around the workbench, as well as all the place of work should be dry and even.
  • Rosettes for power tools have above the level of the work surface of the workbench.

When working at a height (more than 1.5 m), you need to use forests (underlines) with railing 1 m, below lined with a height of 150 mm or higher.

It is not recommended to use standings, barrels, boxes randomly fallen by the arm. You can not overload the forests (grades). In any case, working with a corner grinder, you need to have an even, strong surface under your feet.

Proper start, stop and breaks

Before turning on the device, you should carefully inspect and carefully check the disk. You can not use nozzles with chips, strata, cracks or any other damage.

Before including the corner grinder on the network, you need to install a cut.out (grinding) circle with a pattern upward, then clamp it with a special nut. Size, as well as permissible turnovers are indicated in the technical documentation for the tool.

The mismatch of the characteristics leads at least to marriage in work, premature wear of the disk, in the worst case. to injuries.

When examining the tool, you need to check that:

  • there are no damage or cracks on the case;
  • serviceability of the cable (cord), protective tubes and forks;
  • The handle is well screwed;
  • the circle is fenced, and the casing is securely fixed.

After that, the work of the tool is verified. To do this, you need to connect the fork to the outlet, turn on the power button and the latch. Observe a minute at the work of a corner grinder. Make sure that it works without extraneous sounds, excessive vibration, and the disk does not hurt the protective casing. When disconnecting, the malfunction or performance of the power button and the latch will become clear. If everything is fine, you can start work.


For some, my advice and recommendations will seem not too useful and obvious. But you will be surprised that only half of the owners of the Bulgarians understand how to work with this tool. And those who adhere to safety precautions even less.

The choice of corner grinder and disk

Before giving an answer to the question “How to cut a corner grinding”, you need to deal with the angular grinder itself. Her choice and purchase should be based not only on the fame of the brand and the quality of the assembly. The initial parameter is its size. In my opinion, there should be two corner grinders. One small disk under 120 mm, and the second is large, under 230 mm. It does not make sense to buy corner grinder of medium size, since you cannot put a large disk, and it is inconvenient to work in small products with such a power tool.

I advise you to get acquainted with a very interesting article by my colleague, in which he talks in detail about how to choose a corner grinder and what nuances should be taken into account at the same time. You can read it by this link.

Not only the rate of metal grat can depend on the quality of the disk, but also the safety. I advise you not to save on such consumables and purchase goods from trusted manufacturers. I recommend using discs with 1 thickness.2 to 1.8 mm. Take thick discs in 2.5 mm can be, but, cut it much longer. For homework, a product is perfect in 1.6 mm. The variety of disks for corner grinders and their approximate cost can be found at this link

On yourself or from yourself

The most common question that torments many owners of a corner grinding of a grinding is “how to cut a corner grinder correctly so that the disk spins from itself or on itself?””. There are many opinions, and everyone proves their own point of view. But the correct answer is one: “You can cut both from yourself and yourself”. Obvious evidence of this is the presence of holes under the handle on both sides of the device. In general, it all depends on individual preferences, to whom it is convenient, he cuts so. However, each method has certain nuances, they should be taken into account.


Many owners of corner grinder do not like and can not even cut from themselves. The bottom line is that this method rarely forgives errors. Any inaccuracy or cutting curve leads to a clip of disk and its rupture. I want to say that I have a friend who is used to cutting on myself, and taking my corner grinding in his hands ditched two discs and gone shouting. This is a person who has been working with a corner grinder for about 10 years. There is also a myth that when you cut it from yourself, when the disk is jammed, the corner grinder will fly away into the stomach. I want to say that if it is normally not holding it in my hands, then it can even fly out of the workshop. The advantage of metal cutting from yourself is that sparks fly from corner grinding and may be better to see the product. In addition, with a disk rupture, it will fly away from you.

To myself

Metal cutting at a speed of disk allows you to work with a corner grinder, sorry for the expression, with a slight negligence. But you pay for such convenience sparks flying into the eyes and on your feet. If the protective casing is set incorrectly, then the risk of burning pants increases exponentially. In addition, the product is visible much worse, and when a rupture, the disk can fly under your feet. When cutting metal in this way, I recommend holding the angular grinder so that in the case of jamming and rupture of the disk, the latter cannot get in the leg or other part of the body.

If you want to learn more about the tools for working on wood and about crafts performed with their help, be sure to read the material on this link.

What is an angular grinder intended for and what is intended: General information

The name itself says that it is designed to grind the corners. However, the work performed by the corner grinder will depend on the selected and installed disk. For example, it can be a detachment, a grinder or a special metal brush that allows you to quickly rip off the rust from the metal surface. But brushes are used extremely rare. The most common use of an angular grinding machine can be called a cutting of various metal. pipes, sheets, corners or channels.

It is cutting that is considered the most dangerous work using corner grinder. In order for this work to be performed faster, easier and safer, you should choose the right type of tool.

make, cutter, grinder, correctly

What corner grinder can be found on the shelves

The corner grinder differs from each other not only in size and weight, but also the speed of rotation of the disk. Heavier angular grinders of medium sizes accelerate the disk to 6000-7000 rpm. For this kind of device, the speed is small, but at the same time the power allows you to “dissolve” a rather thick.walled metal.

Good to know! The smaller the number of revolutions per minute, the greater the diameter of the disk can be used to work.

Small corner grinder have a very high disk rotation speed

For household needs, corner grinding machines are often used, which have a very small weight that allows you to hold it with one hand, and reduced dimensions. Such corner grinder develops up to 16,000 rpm., And the discs used for work are very small.

There are very large corner grinders that can only work with a special stand, but they are used only for industrial needs and, in general, they can already be attributed to the category of a end saw. Such equipment will not be considered today.

The corner grinder of medium.sized power is higher, but the number of disk revolutions per minute

Electric saber’s saw: what is needed for, types and main characteristics, canvases for a saber’s saw; differences in models on drywall, wood, metal and aerated concrete; overview of electrical manufacturers; rating of battery, household and professional saws, equipment repair. in our publication.

How to cut a corner grinder metal properly

Next, we will tell you how to properly cut the corner grinding with leaf metal and the blanks of other shapes. There are several basic recommendations.

  • Follow the wear of the cutting part. It depends on the diameter of the disk how deep it will enter the workpiece. When stuck in the circle, on time, replace the replacement.
  • Since the axis of rotation is significantly heated at high speeds, periodically moisten it with water. After cooling, the cutting tool acquires greater performance.
  • At what revolutions to cut the metal with a corner grinder depends on the declared productivity of the tool. Do not disperse it to the maximum, as this leads to rapid wear. The optimal parameter is about a third of the maximum values.
  • Keep an angular grinder when cutting a metal is necessary so that the disk is walked perpendicularly processed part. Do not press on the case. the movements should be soft.

Recommendations of specialists for some types of work

Next, we will tell you how to work with an angle grinding machine with various metal products.

Sharpening of the chain of the chainsaw

Photo 2: Sharpening the chain of the chain of a corner grinder

The chain is pulled on the arrow of the chainsaw. For work, use a sharpening disk 2.5 mm thick. It should be noted the first tooth that you will process. With competent actions, you can update the chain 4–7 times before it finally fails.

Cutting pipes

Start cutting thick metal with a corner grinder is better from the edges. If you start from the middle part, the disk can jam and bend. In the process of processing, make an effort on the lower part of the cutting tool, which ensures the efficiency of the saw.

Cutting moldings

Photo 4: cutting corners of corner grind

For the sawing of the metal corners, you can use wovered wheels or a small.diameter tool. It is important to remember that the work is phased: at first they cut one part of the molding, then the second.

Sharpening of a circle of circular saw

Photo 5: sharpening a circle of circular saw with corner grinders

Start by fixing the angle grinding machine with clamps, leaving access to the rotating part of the tool. Then bring the saw disk to the sharpened circle without applying much effort. The circle should go through the product on the tangent. When working, follow the observance of the sharpening plane.

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