Which Side To Put The Circle On The Angle Grinder

Today, after another argument. which side to put the disk on "Angle Grinder". I decided to speak on this subject in writing, even so in my opinion this question is quite interesting.
And also in the future, than once again to breed demagoguery, it is better to just throw a link to this entry.
I work in a workshop (mainly a power tool) and I see that quite often they wear an angle grinder with "jammed" disks. It sometimes gets stuck so much that you have to disassemble the gearbox and hold the pinion gear in a vice to unscrew the nut with a healthy gas wrench.
It is interesting that the nuts are stuck only on machines with a disc mounted to the right, i.e. "sparked" from the typewriter. If we take into account that under the NORMAL load the moment on the spindle is small, then such a bad self-tightening should not happen, and it happens, why? Due to shock loads, which when installing the disc on the right is generally common.
Why this happens is easier to explain with such an example (too lazy to draw). we start the motorcycle, and, holding it behind the wheel, we try to arrange the slipping of the driving (rear) wheel.

Now how will it be if the disk is on the left and "sparks" under the grinder:
We take the front-wheel drive motorcycle, start it naturally, switch on the gear and, holding the trunk, we admire how the front wheel is wonderfully skidding. It is TOWING (in the analogy it cuts) and not "drives in" under the fulcrum, increasing traction and trying to raise the steering wheel, as with rear-wheel drive.
That is, it turns out that as a system "front wheel drive option" more stable and predictable, even if we press the steering wheel from above.
Well, something like that. Maybe idiotic, but figuratively.

I cut a couple of months ago, a rail sticking out under the ceiling, cut one, standing on a stool, a hefty 2.2 kW angle grinder, and also with the protective cover removed (with it, well, nothing at all!).
If only I cut "push". I’d kill myself. and more than once.

For several years now I have been using an angle grinder in a summer house, and all this time I have not answered two questions: which side to put the cutting wheel in and in which direction it should rotate. “Shoveled the entire Internet”, but did not find a definite answer to these questions. Opinions were divided equally. Both sides provide convincing arguments, and at least some authoritative official documents on this subject are silent. The manufacturers are also silent. Today I want to speculate a little on this topic with the goal of deciding, first of all, with the first question.

So, which side to put the cutting wheel on the angle grinder?

Essence of the question. In the center of the circle (cutting or grinding) there is a galvanized steel ring with four punched holes around the circumference, usually with dents dented down to prevent this ring from turning relative to the abrasive. The inner edge of the ring is wrapped inside the circle, in its central hole, and ends flush with the opposite surface of the circle, without leaving it.

As the manufacturers say, this ring is made to protect the shaft rotating the grinding wheel. “With a high degree of probability”, this is its main function, otherwise the abrasive tool will rub the angle grinder on the shaft over time and will not be able to center it.

The ring is usually located on the side of the circle label. However, there are circles in which the ring extends on both sides of the circle, and on some circles with a recessed middle, it is located only on the side opposite the label and is located on the recessed side. That is, manufacturers mold rings in different ways. Although, I must admit, most cup circles still have rings on the convex side, which is “kakbe hint”, which is preferable to still place the discs with the ring down.

At the very beginning, after buying an angle grinder, I intuitively put the circle with the label out. On that circle, a metal ring in the center was also pressed from the side of the picture. And sawed, and did not experience problems. But then I got a cup-shaped circle (with a recessed center), and in it the picture and the ring were on the convex side. I put it with a picture outside, and it turned out that the circle scratches along the protective casing. I had to turn the circle. And then I had this question for the first time.

The other day, while watching videos about tools on YouTube, I came across a discussion of this issue, and decided to find out for myself, how is it right to circle? As I mentioned above, opinions on the Internet on this issue are equally divided. Then I began to develop my own point of view.

So what we have.

Rings on circles, including cup ones, are molded from different sides, although more often they are on the convex side of the label.

The direction of rotation is not indicated on the circles.

These points tell us that “with a high degree of probability” circles can be put on either side.

Next, I carefully looked at the washer and nut, between which the disk is mounted on the shaft with an angle grinder:

which side to put the circle on the angle grinder

On the left is the washer that is worn on the shaft. It has a ribbed surface and a rubber ring at the inner edge. On the right, the nut, although not polished, has a rather smooth surface, which lies up in the photo. The circle should be clamped between them. At first I thought that the ribbed surface of the washer seemed to be designed to engage the abrasive, and that a smooth nut should slide well along the ring so that it can be easily tightened. But the rubber ring, which was clearly made in order to cling to a smooth surface, was a little embarrassing, and would probably deteriorate if you often had to press the edge of the hole, sharp with burrs, on the side of the abrasive.

I tried to insert the disk between the washer and the nut, and twist the parts with my hands in order to understand in which case which part clings to the disk better. So, in any case, a washer with ribs and an elastic band catches the disk better, even for the ring, but the nut glides even over the abrasive. I also noticed that the circle on the washer is easier to wear with a ring, since there are burrs on the side of the abrasive that impede the free fitting of the hole on the neck of the washer. So the results of these experiments clearly indicate in favor of installing the circle with the ring down on the puck. That is, the label is down.

I noticed one more nuance. The clamping surface of the quick-release nut has a significant play with respect to its thread, which allows it to press the circles, even if there are irregularities on the surface of the abrasive. In this case, such a disk will be pressed evenly. If you turn it over, then it will lie abrasive on the puck at a certain angle, and he will have a transverse runout. This is another argument in favor of installing the circle with the ring down to the puck.

All that I listed above follows only from design features. Now a few words about practical convenience.

Not all angle grinders have a quick-tightening nut like mine. If this is a simple nut with turnkey holes, then it is easier to tighten not with a wrench, but with the circle itself. This will be easier if the abrasive clings to this nut. That is, in this case, you should also establish a circle with a ring to the washer. They also say that if a nut is adjacent to a metal ring, and when it is bitten, it is clamped, unscrewing it becomes much more difficult than if it was adjacent to an abrasive that is crumbling in nature.

In general, after much deliberation, I came to the conclusion that you should put the flat circle with the ring down to the washer, and if the disk is cup, then you can put it in only one position, regardless of which side it will have ring.

el_pir sent me instructions to the Metabo WP 850 angle grinder, which says in black and white:

In this case, there is no clarification, this refers to cup circles, or flat. Just to the cut-offs. Therefore, to all cutting-off. This fully confirms my point. Also in all instructions for Metabo grinders the corresponding figures are given (although only cup circles are shown there):

Well, the main picture on the covers of all the instructions of the Metabo grinders is also kakbe hint (although the circles there are also cup):Metabo deserves all respect for the quality of its tool, and I think that the instructions in their instructions can be trusted (if the Russian translation coincides with English and German, of course, because there are still translation errors, see the end of paragraph 6). So I consider this question closed for myself.

About the diamond tool

Most specialists in repair and construction work today are well acquainted with the angle grinder or, as it is also popularly called, the angle grinder. It is used to process a variety of materials, including stone, reinforced concrete, concrete, marble and many others. For beginners, for the first time, a number of questions may arise, among which the most common: how to install the disk on the angle grinder, how to fix the disk on the angle grinder, which side to put the disk on the angle grinder and in which direction the disk should rotate on the angle grinder. Let us now try to briefly answer all these questions.

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What will be required to install a disk?

Installing a disc on an angle grinder is usually a fairly simple process in which several rules must be followed. In order to produce it, you need to arm yourself with the appropriate tool. the key, which will be necessary to unscrew the nut. The next step, after having untwisted it, will be the replacement of the disc with an angle grinder or its initial installation. If it happened that the disk was clamped in an angle grinder, to remove it, you would have to crumble it and remove the remains from the gap between the support flange and the nut with a flat screwdriver or chisel.

Which side to put the disc on the angle grinder?

Which side to put the cutting disc on may depend on several factors. Firstly, if the disk is not flat, then you can put it in only one way and the question disappears by itself. Secondly, if the circle is still flat, you can focus on the label. if the angle grinder spins from itself, then it is installed with the label inward, if on itself, then outward. If this principle is not followed, then you can expect undesirable results. breakdown of the disk during sawing or just its quick wear.

As for the direction the disk is turning to the angle grinder, this is primarily a security issue. It is believed that it is necessary to cut concrete in the direction of rotation of the disk or on itself. In an ideal position, sparks should fly to the side to the left of the person working with the tool. If this does not work out, then you can use a different position when the sheaf of sparks goes down. In any case, it is impossible to prevent situations where sparks fly away from the user, since in the case of a sharp jamming of the disk, the angle grinder will be directed in his direction.

In other words, it is extremely unsafe to cut materials against the direction of rotation of the disk or from oneself, since in the case of a wedge, a sharp release of the angle grinder occurs in the direction of the one who works. By the way, if you have additional questions regarding how to install a disk on an angle grinder, you can also watch training videos, which are more than enough on the Internet today.

If you still have questions or need advice on changing and installing disks, just leave a request on the website or call the specified contact phone number, and our experts will tell you how to proceed. Our entire range of diamond blade products is presented in the diamond blade section.

Remove the disk from the angle grinder, how to change and correctly place a circle on the angle grinder

How to remove a disk from an angle grinder. an angle grinder (hereinafter referred to as angle grinder), popularly referred to as an angle grinder, is probably the most demanded inventory that is present in the arsenal of almost every master regardless of his qualifications.

This tool is actively used in abrasive processing: cutting, grinding, cleaning of workpieces made of stone, metal and many others. It is widely used in areas such as: construction, woodworking and other similar types of work. Like any other tool, an angle grinder is also not divided into several classes.

The following are meant: household, semi-professional and professional class tools. This classification is determined by the power resource of the tool, its productivity, the presence of certain additional options, material and build quality, etc.

In addition to various types of cleaning brushes, consumables for angle grinders are cutting wheels and a variety of grinding discs. Types of accessories for angle grinder: how to make the right choice?

Disks for an angle grinder differ among themselves according to the following main signs:

For the best understanding, let’s look at the main types of disks for an angle grinder and give a definition of their application:

  1. Cutting wheels. These are the most widely used consumables for angle grinder. Their main purpose is to work with metal, stone and wood. A variety of cutting wheels for an angle grinder are diamond blades. This is a heavy-duty tool for processing materials of increased strength, such as reinforced concrete, tile, porcelain tile, marble.
  2. Grinding and grinding wheels. As the name implies, this type of disc is used for grinding various materials, for example, polishing products made of stone, or for removing (peeling) the top layer, for example, eliminating a layer of rust or old paint coating.

Cutting wheel 115 x 1.6 x 22.23 Titanium Abrasive

Cutting wheels for an angle grinder, in turn, have their subspecies, such as:

  • Cutting wheels for metal work;
  • Abrasive wheels for working with stone;
  • Circles for woodwork;
  • Diamond blades (mentioned above).

The purpose of each type of drive usually corresponds to its name.

Among the grinding disks, there are four main subtypes. lobed, wire, diamond and grinding disks on a bakelite basis (straight lines, T41 profile and disk-shaped, T27 profile).

Grinding wheel 150 x 6.0 x 22.23 Sprut-A

  1. The petal disc is made of sandpaper. Its main purpose is to eliminate an existing coating, such as old paint, a primer or a coat of paint. Also, disks of this type are polished wooden products.
  2. Wire discs are used by craftsmen to remove rust. They can also remove other types of persistent pollution.
  3. Diamond blades are used for stone polishing.
  4. Plate discs are made of plastic or rubber and used to polish metal surfaces.

Please note: in the process of work with most discs, a special paste or grease is used, which contains finely ground abrasives. They are mainly used when grinding surfaces, such as, for example, car body parts.

The main question: How to choose the right disk for an angle grinder?

When choosing equipment for angle grinders, first of all, you should decide on the type of proposed work. The choice of the type of disk will depend on this. We also want to mention that when choosing a consumable, be sure to consider the power characteristics of each specific model. Read the labeling. Often, it is applied to the disc itself and includes a set of characters by which you can determine the relevance of a given consumption to carry out the intended work.

Also, focus your attention on such a parameter as the diameter of the disk. In no case should it exceed the size of the protective cover on a specific model of the tool. The size range of discs is usually represented by the following diameters: 115, 125, 150, 180 and 230 mm. The most common diameters are 125 mm. and 230 mm. They are optimal for most types of work and the capabilities of the tool itself.

Among the Bakelite-based grinding discs, the most popular are 6.00 mm thick discs. This parameter depends on the total disk diameter. The dependence is as follows: the larger the diameter of the disk, the greater its thickness and vice versa.

How to put the disc on the angle grinder?

To correctly place the disk on the angle grinder, it is first worth noting that the disk is mounted on the spindle of the angle grinder using a special clamping flange with M14 thread. Let’s take a closer look at how to remove a disc from an angle grinder. In order to unscrew the disk from the angle grinder, you first need to dismantle the flange. Especially for such purposes, manufacturers complete the angle grinder with a special open-end wrench. It has a specific shape. The pins located on the horns of this key are inserted into specially provided holes on the flange.

Video: Which Side To Put The Circle On The Angle Grinder


To unscrew the flange, we fix the spindle. To do this, we clamp the latch, which is usually a button on the top of the case. When pressed, the cotter pin is placed in the hole of the driven disk of the gearbox, and this, in turn, prevents its rotation. Next, insert the key pins into the specially provided holes on the flange, pressing the latch must be simultaneously turned counterclockwise and move the flange in place. If the manipulations were successful and the flange succumbed, you can unscrew it by hand and put it aside.

Now dismantle the disk. Often, in the process of intensive work with the tool on the inner side of the protective casing, a certain coating forms from small particles of metal and abrasive material. For optimal, stable and durable operation, an angle grinder, remove the bottom of the flange and clean the casing with a steel brush.

To install a new disk, after cleaning the casing, you must perform the following actions:

  1. Install the lower flange in its place;
  2. We put a special gasket on top of it (in case the gaskets are not provided, they can be cut independently. Cardboard or tin will be the optimal material).
  3. Install the disk;
  4. We put the second gasket;
  5. We install the upper flange from above;
  6. We wrap the upper flange by hand in the opposite direction from the rotation of the circle, an angle grinder, while holding the disc itself;
  7. Next, again press the lock button and scroll the flange by hand until you feel resistance;
  8. At the final stage, we finish fixing using the same open-end wrench. To do this, insert the key into the holes and scroll a little more. Remember that you need to tighten it by no more than a quarter of a turn, since in case of excessive fixation of the flange, the disk will become unusable.
  9. Before starting work, be sure to spin the disk idle for at least 30 seconds.

After all the actions performed, you can safely continue to do the work.

One of the most frequently asked questions about mounting / dismounting the angle grinder equipment is: “Which side should the disc be placed on the angle grinder?”.

Usually, inexperienced masters ask this question. Which side to put the disc on the angle grinder depends on a number of factors. Firstly, if the disk is not flat, but, for example, petal, then you will not be able to install it incorrectly, if the petals are not located correctly, simply twist the casing and handle onto the angle grinder. That is, the question disappears by itself.

If the circle is still flat, then you should focus on its label, the so-called “shirt”.

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If the angle grinder rotates on itself, the disk should be installed with a “jacket” outward, if the disk is spinning away from itself, then, accordingly, it must be installed with a “shirt” inward.

If you do not adhere to this algorithm, there is a high probability that the disk will very quickly fail or immediately become deformed.

What to do if the angle grinder has jammed (bitten) a disk?

Everyone who has experience working intensively with an angle grinder must have come across such a situation at least once.

Usually, this happens if the disk clamps between the parts, it stops or breaks, and the engine, the angle grinder continues to rotate and thus tightens the nut irrevocably.

So what can you do if you bit a disk onto an angle grinder?

Each master has his own secrets. Especially for you, we learned a few of them and now we will share the most common ways to get out of the situation.

Method number 1 to remove the disk from the angle grinder

First, figure out which direction to unscrew the nut.

The flange must always be folded in the direction in which the disk rotates.

For this kind of work, you will need either two gas keys or two clamps.

Here’s what you need to do: we destroy the remnants of the disk, with one key we fix the washer located behind the disk, with the second we unscrew the flange.

Method number 2 to remove the disk from the angle grinder

This method involves the use of the famous lubricant VD-40.

It is probably like electrical tape, applicable in all cases of life.

You need to sprinkle the flange, wait about 5 minutes and try to unscrew it with a wrench.

Method number 3 to remove the disk from the angle grinder

This method is used in extreme cases.

Method number 4 to remove the disk from the angle grinder

How to exchange a disk for an angle grinder to avoid disassembling the tool and intensive impact on it? To do this, cut the disk as far as possible, dismantle the protective casing of the angle grinder and remove the rest of the circle with a hacksaw.

When carrying out all the above manipulations, do not forget about safety measures.

Take care of yourself and the safety of your instrument.

Make it a rule that the replacement of cutting and grinding wheels with an angle grinder is carried out in working gloves, and the work itself must be carried out with special safety glasses.

We work the angle grinder correctly. how not to endanger oneself?

Angle grinder is a useful device, which should be in the arsenal of any master. It allows you to perform a range of complex and important tasks, but use it with caution so as not to get injured. The rules for using an angle grinder will be described in this article.

An angle grinder can work properly without endangering oneself, it is possible only to be extremely assembled and attentive. The device should not even be picked up, being unhealthy, tired and intoxicated. Inattention can cost you a lot when using a grinder. In some cases, negligence leads to very serious injuries, and sometimes to the death of a negligent master.

The main condition for correct work with the tool is the use of glasses and a protective casing. The work of an angle grinder necessarily leads to the scattering of sparks, metal fragments, scale and abrasive particles. If you do not protect your face and eyes, there is a high chance of injury. It is best to use a mask or goggles. The fragments and sparks from the angle grinder fly along complex paths, so they can fly under the glasses if in some part they are not tight enough to the body. The mask is best used with a safety net, since during operation there is a possibility of separation from the circle of fragments that fly at high speed and can penetrate unarmoured protective equipment.

Now all new angle grinders come with a casing, which is required for use

The first barrier between the grinder operator and the spinning wheel is the protective cover. In practice, circles are often destroyed during operation, which usually occurs due to jamming of the circle in the slot. The casing is fixed on the tool so that it protects the person from sparks and possible fragments in case of their appearance. The casing must be fixed on the machine as reliably and firmly as possible in order to completely eliminate the likelihood of its spontaneous rotation. Of course, working with the casing is more difficult and less convenient than without it, but when removing this protective screen, you expose yourself to unnecessary danger.

To work with an angle grinder, you need not only a casing and a protective mask, but also hand protection. mittens or gloves. Your hands will be very close to the spinning circle, therefore they should be protected from sparks and all kinds of fragments. We recommend using thick leather gloves or gloves to protect your hands; cotton products cannot protect you reliably.

When processing concrete and stone materials, it is also necessary to use a special respirator. it will protect the respiratory tract from dust. All your clothes should be wide and well tucked, any dangling part of the clothes can be tightened in a circle rotating at high speed, and cause injury.

The angle grinder allows you to perform different types of work, process various materials, and for each of them should use an abrasive tool specially designed for this. Using the wrong circle, you increase the likelihood of a split and endanger yourself. Never place disks larger than those designed for this model on the device.

Small angle grinders are distinguished from larger ones by a higher rotational speed of the disk. Circles of large diameters can simply not withstand too high rotational speeds and collapse. This applies to both new circles, and used, and because of this, decreased in size. Another reason to abandon large circles is that to use such a disk you have to remove the casing that protects the operator, and this is completely unacceptable. over, large circles create a large load on the tool nodes. it wears out faster and can soon fail.

You can put the disk on the angle grinder if it matches the device used and does not have any damage. Cracks, potholes, chips and other violations of circularity or plane significantly increase the likelihood of a back strike and the resolution of the circle during operation.

Diamond blades for angle grinder should be chosen at least medium in price and quality

For safety reasons, it is completely forbidden to install saw blades for wood on angle grinders. Very often, such actions lead to tragic consequences, so do not repeat the mistakes of others if your life is important to you. Sawing wood with an angle grinder should not be for several reasons. Firstly, a tree is a heterogeneous material in which there are knots, and sometimes foreign bodies, such as nails, because of which the circle can break at high speeds. Secondly, such work is simply not practical. because of the high revolutions, the wood discs will quickly become dull.

In order to use the angle grinder safely, after installing the disk, it is necessary to check the operation of the device at idle at maximum speed for 60 seconds. During testing, the circle should spin freely, with minimal vibration, without touching the protective cover.

It is equally important to qualitatively fix the workpieces before work. The dead weight can rarely guarantee complete immobility of the object, therefore it is best to fix the materials in a vice or clamps on heavy structures. Do not attempt to handle objects held in your hands. This will violate two safety requirements immediately, which state:

  1. 1. The angle grinder must be held with both hands.
  2. 2. The workpiece to be machined must be fixed.

Holding the workpiece by hand, you increase the likelihood of displacement of the part and jamming of the circle. You should completely eliminate the bending of the workpiece in the area of ​​the cut, especially if it can narrow the cut. This will almost inevitably cause a disk clamp and a kickback.

Despite the danger, the angle grinder can be used safely if safety precautions are taken and no errors are made. To do this, hold the tool with only two hands. With a reliable hold of the device, even a back strike will not lead to a strong displacement and loss of it from the hands. It is also necessary to ensure that the position of the whole body is as stable as possible, without the risk of losing balance.

Work with the device so that the power cord is always away from the rotating circle. If the cord is near, you can cut it, in addition, it can be pulled to the disk, which will create a danger of short circuit or a sudden stop of rotation with displacement of the tool.

The machine must not be allowed to go until the movement of the disc has completely stopped. If you do not fulfill this requirement, you can catch on a rotating disk for any objects or surfaces. You can only switch from one work area to another place with the machine turned off, otherwise the circle can grab your clothes. In case of interruptions in the power supply network, the angle grinder must be turned off from the outlet, otherwise it can turn on uncontrolled when electricity is restored.

Do not forget that during operation the discs can become very warm, they should not be touched until they have completely cooled down. Make sure that all unauthorized persons are at a safe distance from the instrument, because abrasive particles can harm not only you but also others.

The angle grinder can start work. it is possible to make contact of the rotating disk with the material or the workpiece only when the spindle reaches full revolutions, otherwise the disk may jam. Manufacturers of devices recommend cutting so that the tool always moves in the same direction in which the mounted disk rotates. So you protect yourself from the sudden exit of the circle from the slot made.

Think seven times. cut one!

Many users do not comply with this recommendation, since with such a tool, a stream of sparks from under the circle hides the markings applied to the workpiece. If you lead the device in the opposite direction, you can easily control the accuracy of cutting, but because of this, the violation of safety precautions does not cease to be such. And when choosing between convenience and security, it is better to give preference to the second.

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It is extremely important to ensure the correct position of the tool throughout the entire process of its use. The fishing line should not rest against the operator, it should pass by, away from you. In case of jamming, jamming of the circle, the jet movement of the apparatus will continue away from the person. When cutting, you do not need to press the tool hard, give the angle grinder the ability to perform cutting yourself. A heavy load on the device can lead to distortion and even jamming of the circle. Your task is to direct and adjust the tool, you need to click on it only sometimes and not very much. Never turn on the tool if the circle is located in the cut, cutting metal and other materials in this case with a high probability will end with a back strike.

It is imperative to comply with safety regulations during grinding work. You do not need to use very thin circles for grinding, as well as cutting wheels that are not designed to perform such work. they can break. Grinding should be done with the edge of the disc at an angle of 15-40 degrees to the surface. The tool should be moved with moderate pressure forward and backward. After installing a new, unused disk, it is better to work with it in one direction first. forward. If you take it back, it can crash into the work surface. After rounding the disc, they can work in both directions.

For cutting tiles, stone and concrete substrates, use special circles. When working with these materials there is a lot of dust hazardous to health. It is best to organize an automatic dust extraction using a construction vacuum cleaner connected to a protective casing. Otherwise, be sure to use a respirator. To reduce the amount of dust, it is necessary to ventilate the room during operation, as well as to suppress dust with a stream of water, which is sent to the cut. For this you need an assistant.

angle grinder can be used for various works, including for chipping. When cutting walls, in which there may be reinforcement, as well as elements of utilities, you must be especially careful and careful. If the disc comes into contact with such elements, a short circuit or reverse shock may occur. Therefore, before carrying out work in unfamiliar places, one should definitely study the presence of communications in the walls.

No combustible materials or flammable liquids should be inside or near the working area. Keep away from the angle grinder the product and any objects that could be damaged by sparks and abrasive fragments. If such things cannot be removed, it is best to cover them with a wet rag. In humid rooms, for use, an angle grinder should be connected through an RCD. Only in this way can you guarantee the prevention of electric shock.

Never trust outsiders to work with angle grinders if you are not sure of their qualifications and ability to follow safety procedures.

The kickback is a sharp, sudden rejection of the angle grinder due to jamming of the rotating circle. It represents the greatest danger to the operator, as it is usually accompanied by the destruction of the disk. When the disk is jammed, the reactive displacement of the tool is carried out in the opposite direction to the rotation of the disk. Most often, a back strike occurs due to erroneous actions by the operator or a direct violation of safety precautions by him.

Our recommendations will help to avoid such a problem as a back strike or, if it occurs, to avoid serious consequences. Always use standard handles to hold the tool and do not hold it with just one hand. Stand firmly on the ground so that you don’t lose control of the tool if you drop it. Always stay away from where the tool will move in the event of a reverse impact. When moving the angle grinder in the direction away from you, it can bounce right at you.

Special care should be taken when processing edges and corners. A back strike often occurs when the cut is completed, when the last jumper connecting the two parts of the same object is cut. In such a situation, in order to avoid problems, it is recommended not to finish the cut to the very end, it is better to remove the circle from the opening and cut the jumper from the back. If the device is stuck, it should be turned off and carefully removed from the cut.

Despite all the difficulties and dangers, you are quite able to independently operate an angle grinder. Just follow our recommendations, they will help you perform cutting and grinding without any problems.

How to correctly and safely remove (install) a disk from an angle grinder?

Angle grinder (popular name. "angle grinder"), the most common tool of home craftsmen after an electric drill.

Despite the ease of use, “amateurs” often have questions about tool maintenance, especially in the event of emergency situations. As a rule, breakdowns occur due to improper use of the tool.

Main applications of angle grinder

  1. Cleaning surfaces, peeling old paint. It is carried out by brushes with steel bars or petals of sandpaper. No difficulties in work, except that the sandpaper brushes require compliance with the direction of rotation.
  2. Sanding with sandpaper. A concentric nozzle with Velcro is screwed onto the angle grinder, on which the abrasive is in turn attached. Before use, the direction of the threaded fastening and the rotation of the tool shaft are checked.
  3. Grinding with abrasive wheels. These nozzles require careful handling, since under high load, the abrasive may break. It is impossible to cut off material with such disks; shock loads are unacceptable.
  4. Cutting of metals, stone, gating concrete. Performed by cutting discs.

It is with such nozzles that emergency situations most often occur.

At the cutting wheels dwell more

The question of which side to put the disc on the angle grinder does not have the correct answer. Abrasive wheels do not have a programmed rotation direction, so it doesn’t matter how you install it. The direction, rotation (away from yourself or towards yourself), is determined by the position of the protective casing. The choice depends on the position of the tool convenient for the operator. In addition, the direction of flow of sparks (or stone dust) depends on the position of the casing.

It is advisable to place the disc face up (marked) up. In this case, you will not forget which nozzle is installed: on stone or metal. They are not interchangeable.

For mounting the disc on the shaft, a collapsible flange is included. The lower part is rigidly fixed with chamfers, the upper part is a regular self-tightening nut. It is she who determines which way the disk should rotate to the angle grinder. During operation, the threaded connection is tightened, preventing the nozzle from coming off.

Sometimes washers are included in the kit for damping transverse vibrations. They can be made independently from a dense electrocardboard or paronite.

To fix the flange, a special open-end wrench is attached to the tool. The shaft is secured by a clamping button to create the necessary force when tightening.

Ignorance of a simple question: how to properly install the disk, for inexperienced users can lead to damage to equipment or personal injury. First of all, when changing the disc, it is necessary to clean the shaft and the inner surface of the protective casing with a steel brush.

A layer of metal particles is riveted onto these elements (when cutting the material). Thickness can reach several millimeters, as a result of which the disc loses its alignment or jam.

Large nozzles do not just overload the electric motor. Installation requires removal of the protective cover. If the angle grinder disintegrates and the guard is not installed, fragments can seriously injure the operator.

Another debatable question is whether it is possible to put a disk on a tree on an angle grinder. If you hold the tool with your hands, an unequivocal answer is impossible. The circular can easily jam in the fibrous structure of the tree. An instrument escaped from the hands will cause many troubles, including fatal injuries.

What to do if you have lost the open-end wrench?

precisely, how to unscrew the disk on the angle grinder without a key? There are three ways:

  1. Make a bracket from a rod of suitable diameter (a nail will do). With this device, the flange can be loosened by hand. If the tightening is too strong, insert the lever into the bracket.
  2. Use the gas key. Grasping the outer radius of the threaded flange, it is enough to drop the nut, and then it will unscrew by hand.
  3. Touch the thread with exact tangent strokes. To do this, you can take a core or punch, install it in the hole for an open-end wrench, and with light hammer blows, turn the flange.

All manipulations to change the nozzle are carried out after disconnecting the power cord.

Remove a split disk

There are times when the cutting wheel is jammed during operation. Not only have you lost the nozzle, in such a situation the flange (its threaded part) is clamped with repeated force. How to remove a disk from an angle grinder in such a situation?

First of all, the tool should be securely fastened. Use clamps and a solid workbench. Then you need to lock the shaft lock key. If the hand effort is insufficient, extend the handle of the open-end wrench: for example, with a piece of steel pipe.

There are times when the flange is jammed “tightly”. Then there is a chance of damage to the lock key. To save the tool, you should disassemble the gearbox, and clamp the output shaft in a vice.

After that, we continue disassembling the above methods: reinforced horn or gas key. The disadvantage of this method is that you can damage the shaft, notches will remain on it.

If the shaft is completely removed from the gearbox, it is possible to fix the chamfers of the lower part of the flange using a traditional key. Then the risk of damage is minimal. With any method, it is recommended to use penetrating lubricant: WD-40 or ordinary kerosene. After several minutes after application, you will significantly reduce the effort.

Bottom line: Any problem is easier to prevent than deal with the consequences. Observing the rules of operation and the tool, you minimize the possibility of emergency situations.

How to correctly and safely remove (install) a disk from an angle grinder? Link to the main publication