How To Unscrew A Disc On An Angle Grinder With A Wrench

With a gas wrench

The shoulder when using the gas wrench increases, therefore, the moment of force also increases. It is easier to unscrew stuck joints with such a tool. But if you try too hard, you risk crushing the flange or breaking the spindle rotation lock.

With open-end wrench and socket

The working surface of the 17 key grinds off up to 4 mm in thickness. On the surface of the 24 mm socket, grind 4 projections so that they fall into the holes of the flange.

The open-end wrench must be placed under the disc. Put the socket head on the nut of the angle grinder and return it with a ratchet in the direction of rotation of the wheel.

Warming up

The clamping nut must be heated with a hot air gun or gas burner to make the metal more pliable. Then unscrew it with a universal wrench or by hand. But the risk of this method is that you can spoil plastic parts and gear elements.

A jammed nut: how to unscrew a disc on an angle grinder?

Angle grinder. A multifunctional, but capricious tool, which does NOT tolerate haste and negligence. Breakdown and failure. The consequence of careless handling or safety violations. And the most common problem when working with an angle grinder. The abrasive tool is jammed between the support flange and the clamping nut. How to unscrew a disc on an angle grinder without damaging parts and the tool itself?

With a hammer drill in jackhammer mode

The hammer drill must be switched to the chiseling mode without rotation. A 6 mm drill must be placed on the end of the flange or rest against the edge of the hole. A task. Unscrew the nut, push it out. After that, unscrew it with your hands or with a key. During work, you need to block the rotation of the spindle.

Disk destruction

Before unscrewing the nut on the angle grinder, you will have to completely crumble the disc. If he is already destroyed, you can use his hands below. Solid circles can be sprayed with a hacksaw or a blade on metal. Here is the abrasive wheel The inner metal ring and pieces should remain, and not amenable to mechanical stress. Then you need to clamp a metal profile or any unnecessary plate in a vice, the thickness of which is less than or equal to the thickness of the disk (but not more). Then turn on the angle grinder and grind off the remaining abrasive to the seat sleeve. Then the flange can be easily unscrewed with the universal angle grinder wrench.

You can take care in advance that the tool is NOT clamped in the angle grinder:

• Cut washers out of cardboard or plastic and place one under the disc and the other. Between disc and flange. Even if the circle is jammed, the plastic washer will melt when heated;
• The face of the abrasive tool, to which the marking label is affixed, must be in contact with the support flange and not with the clamping nut. With this installation, the metal ring of the circle acts as a washer and protects it from jamming;
• Weld a standard hex nut onto the flange and unscrew it with a regular wrench;
• If possible, use the angle grinder wrench only to loosen the clamping nut. When installing a new tool, it is better to tighten it by hand or at least control the tightening torque.

Preventive measures

Cardboard club will allow you to unscrew the nut after any emergency situations

This method is simple and convenient, but still it is more convenient NOT to break anything, but simply Unscrew. In addition, there are times when the discs are simply clamped hard. It takes a long time to break a detachable abrasive with a thickness of 5 mm, and then grind it under the nut, because there is a method to avoid the situation when it will be impossible to unscrew the nut.

To do this, you only need to make a spacer from cardboard.

We remove the cutting disc in a non-standard way

Angle Grinder. The most dangerous power tool

Discs on an angle grinder are fixed with a nut, which is screwed in the same direction in which the spindle of the power tool rotates. And when the rotation stops abruptly, self-tightening of the fixing nut occurs.

In order to unscrew it later, you need an effort that significantly exceeds that that arose with the wedge, and this is done relatives or a gas wrench is simply impossible.

There is NOT enough strength to unscrew the nut, and the key will come off

You need to do otherwise, namely, remove the cutting disc from under the nut, and then unscrewing the last nothing will interfere.

Why bites the nut on the angle grinder that holds the disc

I will say, perhaps, a well-known truth. Bites nuts more often on angle grinders with a disc size of a significant size, say 150-180 mm or more. The thing is that the resulting torque, in the case of a disk impact at the time of the beginning of cutting, is much greater than for a disk, say 125 mm. As a result, the nut is tightened by inertia so much that it is very difficult to break it in the usual and usual ways. Now about the special ways.

How to unscrew the disc nut of an angle grinder (angle grinder) if it is bitten

So, if there is no way with the key, even if you insert it and hit it slightly with a hammer, then we start using something more serious.

The first thing to try, but again without fanaticism, is to take a rod, insert it into the holes on the Nut and, using a hammer, move the nut in the direction of its untwisting. The main thing here is not to break the button and NOT to rip holes, as here

The second thing that many advise is to warm up the nut. We warm up the nut. In total, it is a little, but physically it is still obliged to expand. Resizing may or may not help.

The third method is the most effective, and, oddly enough, one of the safest for the angle grinder itself. We take and break off the edges of the disk along the nut.

Next, we use a thin metal plate or another disc (thinner), and maybe a second angle grinder with a disc. In this case, a broken disc must be turned either with a plate or a disc. We try to sharpen the disc so as not to damage the nuts holding this disc, because they will still be useful to us. So we sharpen the whole broken circle, until we grind the Ego and the nut does NOT unscrew.

This business is 4-5 minutes, no more.

If you will be using a second disc or metal plate, it is best to insert them in a vise to hold them. Since it is dangerous to hold such objects with your hands. This method is the most effective.!

How to unscrew a disc (nut) on an angle grinder, if bitten, jammed, and not unscrewed # 128249;

The angle grinder, or as it is called more popularly and in the popular way, the angle grinder, is nowadays an irreplaceable and very useful tool. Without him, neither here nor there! And if it suddenly fails, then you have to dodge all sorts of things, look for alternatives and think about restoring the instrument. At the same time, it is impossible to use an angle grinder for its intended purpose because of a kind of simple lining when the disc is NOT unscrewed. Rather, the nut that holds this disk is NOT unscrewed. Here you can break the wood, namely, the key is bent or broken, the lock button is damaged, the body is broken, but still DO NOT unscrew the very unfortunate nut. So, we will immediately warn you, if it’s not too late. If you do not unscrew the nut holding the disc with a wrench a second time, then you need to change tactics. And it is precisely the cardinal method of unscrewing that our article will be devoted.

How to avoid biting the disc nut on an angle grinder

And a few words about preventing such unpleasant precedents again. You can use small cardboard spacers, insert them between the disc and the nut. In an extreme case, we use a disc of a smaller diameter, unless, of course, the nut is tightened from above. In total, it will be possible to unscrew such a nut without any problems. It will NOT be clamped, for a bite on the thread.

And a little more on the topic, in a problem that I studied on my own experience.

How to Unscrew and Place a Disc on an Angle Grinder

This simple operation sometimes baffles even experienced locksmiths or users of an angle grinder. The reason is that the disc is fixed with a special nut. There are 2 or 4 holes on the Nut, into which a special key is inserted. This key was always included with the purchase of an angle grinder. Perhaps he is now included in the kits.

According to the instructions for the angle grinder, you must press the lock, which is located on the back of the gearbox. When the shaft is fixed, use a special wrench to unscrew the nut and change the disc. But it is difficult to unscrew the nut if it is NOT clamped. And it clamps it with such a nut almost always. An attempt to unscrew the disc leads to breakage of the retainer along the gearbox.

How to remove a hardened disc from an angle grinder

Applying new nuts solves the problem of removing the disc, but what to do with an already eaten disc? Even if the disc was installed correctly, it is not always possible to remove it. Practice suggests different ways to solve the problem. You can clamp the retainer and hit through the extension on the nut holes in the direction of untwisting. This option is possible only if the retainer is in good condition. But the retainer may NOT withstand such a solution to the problem and break.

The second method is more logical. Under the clamping nut and the lower support washer there is a gearbox shaft with turned chamfers. They put on the lower support washer. The standard wrench cannot be installed there. Very narrow. But you can take an ordinary open-end wrench for 17 and grind it on both sides.

The turned key will enter the gap, fit on the shaft chamfers and fix it. Now any nut will be unscrewed with any key, and the disc or its remains will be removed from the angle grinder.

What is the solution to the problem offered by experts and amateurs

• Install a newspaper gasket under the nut;
• Install a gasket from a plastic bottle under the nut;
• Replace the nut with a nut of a different design.

What is a newspaper strip. This is a paper club in the size of a nut. It is put on the Installed disk, and a nut is screwed on top. This piece of paper was a sticking point, because the safety inspectorate has always announced that such a decision was harmful.

Representatives of safety authorities treat the installation of gaskets made of any other materials in the same way:

• Cardboard;
• Paronite;
• Gaskets from various plastics;
• Rubber gaskets of various thicknesses.

But there is a solution that does not contradict the safety requirements, and allows you to install and remove the disk normally. This is a special nut that has two parts. Nuts and washer. The use of such a nut does not require any shims, because the disc does NOT jam with it.

If there is no special key at hand, then the craftsmen offer to do without the key. This does not mean that you can do without a key at all, but use gas wrench or the second device. To do this, tighten the retainer, tighten the nut with a gas wrench and unscrew it. This way you can replace a jammed disc, but this is a very inconvenient operation for one person.

There are also suggestions to clamp the disc with your hand and unscrew it. Perhaps, but it is unlikely that it will be possible to replace broken disks. It is better to use the keys, which are designed to remove and install disks.

Some foreign companies, manufacturers of power tools, such as Bosh, produce an angle grinder with easily removable nuts. They securely fix the disc on the tool shaft, easily and quickly removed for disc replacement.

How to properly place a disc on an angle grinder

Grinding discs have different diameters, different thicknesses and different uses. Some are made for metal processing, the second is for ceramics, and the third is for wood.

An angle grinder must be fitted with a disc of this size, which does not exceed the size of the protective cover. The size of the disc to be installed is indicated in the instructions and on the marking table of the angle grinder.

The thickness of the disc is selected according to the technological parameters of the material being processed. All discs (grinding wheels) have their own classification. Disc shape, material abrasiveness, grain size, hardness, accuracy class and unbalance class are classified. It is the last value that is responsible for the fact that some discs begin to beat during operation.

The grinding wheel has a front and a back. The front side is the one on which the manufacturer’s markings and corporate drawing are applied. Face upwards when installed on an angle grinder.

Installs the disc in this way. So that during operation, sparks with particles of the material being processed fly towards the worker. This is related to a safety issue. If the angle grinder breaks free from the hands, it will NOT fly towards the worker.

Therefore, it is imperative to wear protective clothing or a heavy apron when working with an angle grinder. Eyes and open parts of the face must be protected with a mask or at least goggles.

The first way

Then you need to take a metal plate, the thickness of which is less than that of the disc. With the help of this plate, its remains will be grinded. To do this, turn on the angle grinder, and clamp the metal piece securely with pliers. After performing THESE actions, the nut can be unscrewed even by hand.

What else can you do?

Nut jammed. How to unscrew?

It is not so easy to remove the disc on an angle grinder if it is bitten, especially without damaging the cutting element or tool. Also consider several options for action.

Finally

Despite the fact that there are many ways to solve the problem with a jammed nut of inventions, it is best to prevent breakage. Many craftsmen independently equip an angle grinder with washers. For the manufacture of such gaskets, cardboard or tin is suitable.

Disk Angle Grinder (angle grinder). One of its main working parts.

Disk Angle Grinder. This is a consumable material; you will NOT be able to save on it in the process. The disc will gradually wear out (burn out) and need to be replaced. When planning work, you need to be prepared for this and it is better to stock up in advance Several removable disks.

Tapping nuts

This method is similar to the previous one, only you can use a suitable metal rod or chisel. After fixing the spindle head, tap on the edges of the clamping holes in the direction of the wheel movement. By slightly sliding the latch off the dead center, you can unscrew it by hand. However, the method is not the most harmless to the instrument. Standard key bore holes are damaged.

How to remove it?

Discs especially designed for cutting quickly burn out and they have to be changed.

It would be useful to remind once again about the need to disable Angle Grinder from the network. Work to be done with fast rotating parts and better protect yourself.

If you need to replace a worn disk, you need to perform a number of simple operations.

• There are times when for some reason the key was not at hand. What to do? The easiest way out. Stop working. But, as they say, this is not our method. Unscrew the clamping nut without a key Angle Grinder is also possible. Often a pipe (gas) wrench is used for this. On such a key there is a device that spreads it. It is necessary to tighten the nut and, fixing the gearbox Angle Grinder button, move it from its place. Then it can be unscrewed by hand.

• There are holes in the grove for fixing it with pins on the horns of the key, you can unscrew it, tap with a hammer on a chisel or a bar that is pressed into the hole.
• Sometimes it is possible to push the nut by simply tapping its edge with a hammer in the direction of twisting. However, in this case, damage to the flange may occur, especially the holes for the pins of the key; in the future, it may be impossible to apply the key to such a Nut.
• A very good result is obtained when using a nail to make a key. It is better to choose a large nail, from 100 mm. Using a hammer and pliers, the nail is U-shaped. A hacksaw or chisel is used to cut off the tip and head of the nail. With such an improvised key, you can try to knock off the nut. You can bend the ends of such a key, then it will turn into a kind of open-end key, but this will require a lot of labor. You can also insert a gate, such as a hammer or other nail, into the arc formed by a bent nail.

How to change disc with and without an angle grinder wrench?

Angle grinder. Universal power tool. It can be used to cut steel profiles and wood, handle concrete and stones, perform grinding and roughing work, sharpen hacksaws. And for each operation a certain circle is provided. For example, a thin cut-off wheel for an angle grinder cannot be cut off the surface. It will break quickly. How to place a disc on an angle grinder correctly when grinding and breaking a wheel or switching to another type of work?

According to the operating manual, replacing the disc with an angle grinder should be done as follows.

• Unplug the power tool cord from the socket.
• Press the spindle rotation lock button.
• While holding the lock button on the angle grinder, using an open-end wrench, Unscrew the flange nut. Turn the wrench for an angle grinder in the direction of rotation of the disc. If it is difficult to press the button with one hand and use the key with the other, ask someone close to you to help you.
• Remove the old disc from the spindle shaft.
• Install a new disk.
• Fix it with a nut by hand or using the same universal wrench. At this moment, you need to hold the stopper with the other hand. Do not overtighten the nut.
• Plug in the angle grinder for 30 seconds at maximum speed. If the disc rotates freely, without beating, and without touching the protective casing, you can start working.

The angle grinder must be supplied with an open-end wrench. Cheap angle grinders often go with poor quality wrenches. It can quickly break (however, this happens with tools from leading manufacturers). In the end, the key can simply be lost. How to properly install the disc on an angle grinder in this case, WITHOUT having the right tool at hand?

How to change a disc to an angle grinder without a key?

Method 1. Use a gas wrench. Using an adjustable pipe wrench, grasp the nut and carefully unscrew it, and not apply great force. Disadvantage: you can crush the nut, break the rotation lock.

Method 2. Make a homemade wrench for an angle grinder. To do this, you need a long nail (at least 100 mm). It is necessary to cut off the cap, sharp and give the Nail a U-shape. It should be bent in such a way that the racks instrument hit the flange holes. If the nut is tightened tightly, insert any metal bar between the posts of the nail and, grasping it with both hands, rotate the structure in the direction of the circle’s movement. At this time, you need to press and hold the spindle lock button. The method is safe, but it takes time and additional tools. Hacksaw, vise, hammer.

Method 3. Tapping with a chisel. Before changing the disc, you can treat the spindle shaft with WD-40 fluid and wait at least 15 minutes. Then put sharp thin chisels at an angle to the flange nut hole and gently tap on the entire surface of the hole with a metal hammer. Sooner or later, thanks to gentle tapping, the nut will break off, and it will be possible to unscrew it manually. The disadvantage of this method is that you can damage the holes and spoil the flange.

Method 4. Heat the nut. If it is difficult to unscrew the nut of the angle grinder by hand, you can heat it up a little with a gas burner or autogenous machine. You need to unscrew the flange with gloves so as not to burn yourself. This is the most risky of the proposed methods. Can overheat bearings and oil in the gearbox of an angle grinder.

Finally, I would like to mention a few fundamental points regarding replacing the disc with an angle grinder.

• The angle grinder must be fitted with a suitable size disc. It is necessary to strictly observe safety precautions and in no case do NOT remove the protective cover in order to install a disc of a larger diameter. When choosing a disc, you need to take into account the model of the power tool, its power, spindle speed.
• The disc that rotates at high speed creates defamation on the protective cover of the angle grinder. Therefore, when changing a disc, remove and clean the casing.
• Some models of grinders are provided with washers so that the disc does NOT get jammed between the flanges. At least the support flange can be fitted with a rubber washer. Instead of factory hardware, you can cut cardboard, rubber or plastic spacers. 2 gaskets need to be used: between the support flange and the disc, between the disc and the nut.
• Do not forget: if the circle rotates clockwise, then the nut is also unscrewed clockwise and tightened counterclockwise.
• If you don’t want to buy a new wrench, fit a Bosch quick-locking nut to your angle grinder. It can be easily unscrewed by hand.

The main thing is that when changing a disc to an angle grinder, without violating safety precautions and performing all manipulations with the tool turned off from the network.

How to install correctly?

Installing a disk on the UMSH. The matter is not so difficult. You can change it simply by following the instructions, although there are some nuances here.

First of all, you must install the disc in the correct direction. This is especially important if it is detachable. Typically, the side of the disc with the label on which the marking is indicated and, accordingly, the scope of its application, is slightly different from the opposite side. It may not appear immediately, but with prolonged intensive work, the difference will not only be noticeable. It will be obvious.

A wide pressure washer is placed on the side on which the label is glued, and the movable nut acts on it when tightening (installing the disc). The nut slides on the polished surface of the washer, without it it will be more difficult to tighten or unscrew, since the abrasive will firmly hold the nut and more effort will be required. This is especially important if a quick replacement of the disc is required or if it is broken (jammed).

With circular saws or other products that have teeth or a significant difference in two sides, the problem usually does not arise. For example, it will NOT work to fix the grinding disc on the contrary: it will simply be impossible for them to work.

Discs for stone, including diamond ones, have a special rotation indicator in the form of an arrow: When installing them, you need to fasten them Considering where the rod will rotate.

It is also important to consider the size of the disk when installing. Under no circumstances should you neglect safety and remove the protective cover. It is better to choose a disc of the appropriate diameter. Sometimes on Angle Grinder smaller dimensions put a worn out disk from a large unit. However, a worn out disc, as a rule, cuts worse, the working surface is limited to about half the radius of the disc, the structure is slightly different. Drive faster is burning, and produces less work. This operation can be justified if the stem diameter is the same. But it will NOT be possible to change back.

When installing under the disc, debris must NOT fall. Of course, the clamping nut can easily live on small objects, something will press into the surface of the circle. But imperceptible to the eye, the skew will cause a displacement of the plane of rotation and, as a result, a strong vibration of the entire mechanism, it can become a prerequisite for the destruction of the disk and, of course, it is not worth hoping for an accurate cut in this case.

The clamping nut must be unscrewed with the wrench supplied with the tool. To prevent the stem from spinning, it must be locked by pressing a special button. It is necessary to unscrew the nut while holding the button down.

After twisting the nut, a disc is put on the free rod, face out, and you need to make sure that it is installed exactly in the seat.

Complete with new Angle Grinder a number of cardboard spacers are always included. When installing the disc, they must be laid so that they are between the disc and the pressure elements. Such gaskets will help unscrew a broken or jammed disc.

Further, the nut is manually tightened to the stop and tightened with a special wrench. All, Angle Grinder ready to go.

How to change a disk if it is jammed?

What if the circle is on Angle Grinder jammed? This can happen, for example, when, as a result of work, pieces of the workpiece being cut sharply clamp the rotating disc. Often this leads to its destruction.

It can be very difficult to unscrew the nut tightened as a result of rotation, if the circle is bitten.

• One of these methods would be to use two gas keys at once. In this case, the rest of the disk is needed below with pliers. It is necessary to clamp the part of the stem located under the disk with one key, and with the second. Unscrew the flange.
• Sometimes, to gain access to the gas key to the stem Angle Grinder, have to disassemble the gearbox.

• A simple device saves the problem of a jammed nut. Washers made of cardboard or tin. They are often sold with Angle Grinder. But over time, they can be lost or become completely unusable. Making homemade washers is not at all difficult. However, it is better not to neglect them.

How to remove it?

Discs especially designed for cutting quickly burn out and they have to be changed.

It would be useful to remind once again about the need to disable Angle Grinder from the network. Work to be done with fast rotating parts and better protect yourself.

If you need to replace a worn disk, you need to perform a number of simple operations.

• The disc is secured to the stem stem with a threaded nut. In the kit of any angle grinder there is a special key, on the arms of which a pin is fixed, which cling to the holes of the flange.
• The spindle is fixed with a special button, the cotter pin of which, when pressed, enters the hole in the gearbox, thus fixing it. I pressed the button with my right hand, at the same time with my left hand I need to Unscrew the fastening nut with a wrench. If the nut has moved out of place, unscrew it by hand. That’s it, now the disc can be removed.

• There are times when for some reason the key was not at hand. What to do? The easiest way out. Stop working. But, as they say, this is not our method. Unscrew the clamping nut without a key Angle Grinder is also possible. Often a pipe (gas) wrench is used for this. On such a key there is a device that spreads it. It is necessary to tighten the nut and, fixing the gearbox Angle Grinder button, move it from its place. Then it can be unscrewed by hand.

• There are holes in the grove for fixing it with pins on the horns of the key, you can unscrew it, tap with a hammer on a chisel or a bar that is pressed into the hole.
• Sometimes it is possible to push the nut by simply tapping its edge with a hammer in the direction of twisting. However, in this case, damage to the flange may occur, especially the holes for the pins of the key; in the future, it may be impossible to apply the key to such a Nut.
• A very good result is obtained when using a nail to make a key. It is better to choose a large nail, from 100 mm. Using a hammer and pliers, the nail is U-shaped. A hacksaw or chisel is used to cut off the tip and head of the nail. With such an improvised key, you can try to knock off the nut. You can bend the ends of such a key, then it will turn into a kind of open-end key, but this will require a lot of labor. You can also insert a gate, such as a hammer or other nail, into the arc formed by a bent nail.

How to Place a Disc on an Angle Grinder Correctly?

• How to install correctly?
• How to remove it?
• How to change a disk if it is jammed?
• Tips

Disk Angle Grinder (angle grinder). One of its main working parts. It is the disc that determines the application of the instrument. With it, this machine can be used to cut, grind or polish various materials. Discs, depending on the purpose, differ from each other: from abrasive chips. For metal, steel cutters and circular saw blades. For woodworking, diamond-coated. For stone and tiles, all kinds of brushes, corbels and emery wheels. For polishing various surfaces.

Disk Angle Grinder. This is a consumable material; you will NOT be able to save on it in the process. The disc will gradually wear out (burn out) and need to be replaced. When planning work, you need to be prepared for this and it is better to stock up in advance Several removable disks.

Tips

If you had to use a gas wrench, you must remember about the very powerful shoulder of such a wrench and about the effort that is applied to the parts Angle Grinder. If you do not act carefully, the spindle lock could be ripped off or the gearbox could be damaged.

All manipulations with the disc of the angle grinder must be performed with the power supply completely disconnected (the plug must be removed from the socket). Any inadvertent pressing of the start button will become a prerequisite for turning on the electric motor, and the speed of rotation of the rod is very high. In this case, injuries cannot be avoided.

Work with the Angle Grinder involves a large amount of waste in the form of metal or wood shavings and dust. Before starting work, you must wear special safety glasses: they will protect your eyes from fragments of the cutting wheel itself in case of jamming and destruction.

Glasses are essential Not only as an element of safety. If the eyes are protected, more attention can be paid directly to the work Angle Grinder, ensure the correct cut or selection of the correct operating mode. This will allow the most effective use of consumables (cutting wheels), minimizes the occurrence of emergency situations with a biting disc or its destruction.

A protective mask that completely covers the face will perfectly replace the glasses. This is especially true for a visually impaired craftsman who wears diopter glasses that cannot be worn with safety glasses.

Drive on Angle Grinder can be set as push, so and to myself depending on the direction of rotation and thus the chip flow. In work, this does not make a fundamental difference. However Angle Grinder with a circle to myself when biting the disc, it tends to jump out of the cut forward, and not at the user. This is especially important when working with powerful tools, but a small angle grinder can pose a serious hazard.

A specially mounted extension cord with a plug socket, preferably without grounding, will help to quickly stop the operation of a machine that has escaped from the hands.

Angle Grinder. The tool for rough processing and striving to obtain an ideal surface as a result of its work is not worth it, the main thing is to make a rough cut, which later, if necessary, can be processed in other ways.

To work without clamps and jamming long metal workpieces It is better not to cut to the end, leaving 1-2 mm of metal in the cut: they will be easy to break off afterwards, this will practically NOT affect the quality of the workpiece.

It is better to place small workpieces in a vice or by pressing it with a clamp to a workbench or other reliable horizontal surface. Here the pressure density depends on the quality of the cut and safety.

How to place the disc correctly on Angle Grinder, can be seen in the following.