How to put a diamond disc on an angle grinder

How to unscrew the disc (nut) on an angle grinder if it is jammed, seized, cannot be unscrewed

Any work, especially with machines, often results in abnormal situations, the solution to which is not provided by the manufacturer. But wit, manual dexterity, ingenuity and knowledge of elementary fundamentals of physics will help to cope with the majority of complicated cases.

Angle grinders like to make surprises in the form of excessive clamping of the cutting disc. Especially diligent in this matter angular grinder with powerful motors (power consumption of which exceeds 2000 watts).

What causes the problem??

It is difficult to encounter such a problem when rotating at idle speed. Especially when working with light circles and tools with soft start function. However, after increasing the RPM and coming into contact with the surface to be cut, the following happens:

  • When material resistance is encountered, the wheel’s angular velocity is drastically reduced, it slows down.
  • Motor coasts for a few moments at the same speed, taking the gearbox and spindle with it.
  • The retaining nut is tightened more by inertia on the threads of the spindle head, thus pressing the cutting disc in.

The tightening process of the locking flange is finished. the abnormal situation is evident. The following factors influence its occurrence:

  • Large wheel size.
  • High tool power.
  • Massiveness of the rotor.
  • Rapidly increasing cutting depth, t.е. Increase in resistance.

In this case, it is very difficult to remove the disc from the angle grinder. Extra precautions must be taken.

What causes the problem??

A similar problem is difficult to overcome when rotating at idle speed. Particularly when working with lightweight wheels and tools with soft-start function. However, after increasing the RPM and coming into contact with the surface to be cut, the following happens:

  • If there is material resistance, the grinding wheel’s rotational angular velocity is severely reduced and the wheel is braked.
  • The motor continues to run at its previous speed for some moments due to inertia, dragging the gearbox and spindle along with it.
  • The retainer nut is tightened more by inertia on the threads of the spindle head, thereby pressing the cutting disc in.

That’s it, the tightening process of the fixing flange is over. the abnormal situation is evident. The following factors influence its occurrence:

  • Large wheel size.
  • High power output of the tool.
  • Massiveness of the rotor.
  • Rapid increase in cutting depth, i.e.е. Increase in resistance.

In this case, it can be very difficult to remove the disc from the angle grinder. Additional measures must be taken.

The problem solution

If the nut cannot be unscrewed with the standard method (special wrench), the following methods can be used:

    Use a pipe wrench instead of a special one like a socket wrench.

If these gentle methods are not successful, you can resort to drastic methods:

    Completely destroy the cutting disc with pliers. Grind the rest of the disk all the way down to the nut. While the machine is in operation, grind away the remains of the cutting disc with a metal plate which has a thickness less than the disc and can freely pass into the gap between the corkscrew nut and the thrust washer. Once the wheel has been ground down to the center ring, the retaining nut is unscrewed with the standard method. Warning! This method requires great care. Also, this method is not suitable for wheels that do not wear off (diamond, grinding, brushing, etc.п.).

As you can see, before you irrevocably cut off the stubborn nut with another angle grinder, you can try to remove the disc with less traumatic ways to the tool.

How to remove a jammed disc from an angle grinder

Using new nuts solves the problem of removing the disk, but what to do with an already jammed disk? Even if the disk has been installed correctly, it is not always possible to remove it. Practice suggests different ways of solving the problem. You can clamp the retainer and hit it through the nut holes in the direction of unscrewing. This is only possible if the retainer is in good condition. But the retainer may not be able to withstand such a solution to the problem and break.

The second method is more logical. Gear unit shaft with chamfers underneath the jam nut and bottom support washer. The lower support washer is put on them. A standard wrench cannot be mounted there, it is very narrow. But it is possible to take an ordinary “17” open-end wrench and grind it on both sides.

The sharpened wrench will enter the gap, set on the chamfers of the shaft and lock it. Now any wrench will unscrew any nut and remove the disk or its remnants from the angle grinder.

Which side is suitable for installation

In order to determine which side to place the disk, several basic factors must be taken into account.

  • You can pay attention to the label. If the angle grinder is working away from itself, i.e. turning away from the operator, it is then necessary to mount the disc with the label facing inwards. If it rotates in the opposite direction, it means that the label must be facing outwards.
  • You can do this without looking at the label. But then you can expect the most unpredictable results, such as the usual breakdown of the disk and angle grinder. At the same time, experts say that such negligence can lead to the fact that the angle grinder simply jams and in this case it is not necessary to talk about safety.

In order to determine in what direction the angle grinder should twist, here it is necessary to refer to the information on safety. Concrete, in particular, must cut against itself.

In this case, the sparks will fly from the side, namely from the control. In general, it is not safe to cut materials away from yourself, because in case of jamming, the angle grinder with a disc will fly exactly to the one who controls it. It is necessary to consider.

What side to put the disk on the angle grinder, what to do if the disk is jammed? 13.08.2015 09:47

Most experts on repair and construction work today are well familiar with the angle grinder or, as it is also called by the people, the angle grinder. It is used for processing a variety of materials, which include stone, reinforced concrete, concrete, marble and many other. In beginners at first a number of questions may arise, the most frequent of which are: how to properly install the disk on the angle grinder, how to mount the disk on the angle grinder, which side to put a disk on the angle grinder and in what direction should the disk turn on the angle grinder. Let us now try to give a short answer to all these questions.

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

What is a gasket made of newspaper? This is a cardboard washer to the size of the nut. It is put on the mounted disc and the nut is screwed on top.

Read more:  Speed regulator for do-it-yourself angle grinder

This was a stumbling block because the Health and Safety Executive continuously advised that it was harmful.

In the same way the representatives of the security authorities and to install the gaskets of all the rest:

But there is a solution that doesn’t contradict the safety requirements, and allows the normal insertion and removal of the disc.

This is a special nut that consists of 2 parts. a nut and a pressure washer. This nut does not need any washers so the disk does not jam with it.

If there is no special wrench in hand, then the craftsmen let do without a wrench. This does not mean that you can do without a wrench, but use a “gas wrench” or other device. To do this, clamp the locking device, squeeze the nut with a pipe wrench and unscrew it.

This way you can replace a jammed disc, but it is an extremely awkward operation for 1 person.

There are also suggestions to clamp the blade with your hand and unscrew it that way. Maybe, but I don’t think that’s a good way to replace a disc that’s broken. It is better to use wrenches that are provided for removing and installing discs.

Some companies overseas power tool manufacturers, such as Bosh, produce angle grinder with easily removable nuts. They firmly clamp the disc to the tool shaft and are quick and easy to remove for disc replacement.

Diamond tools: tips for choosing

Disc diameters for angle grinder come in one hundred and fifteen to four hundred mm.

If necessary, even glass can be cut with an angle grinder.

For highly specialized applications there are their own diamond discs. When buying a product, carefully read the information on the packaging. Traditionally, manufacturers indicate which mies the disc is designed to work with. It is better to use the diamond disc in accordance with the manufacturer’s advice. this will extend its service life.

Disks for cutting hard in the highest density have a body of the softest alloy. When wiped, they release a fresh batch of diamonds to replace the worn ones. Products for softer materials have harder alloy bodies, because the diamond part wears more slowly and the wear process of the body and the diamond part must wear evenly.

If a diamond tool becomes difficult to cut, do not rush to change it.

The characteristics of the product can be restored by making cuts of a homogeneous abrasive (most often brick is used).

Choosing a diamond disc for the angle grinder, do not forget about the size and.

The range of diameters ranges from one hundred and fifteen mm (for small angle grinder home use) to four hundred mm (for industrial angle grinder).

In addition, the tools differ in quality, although, as mentioned above, diamond wheels are better than conventional.

But also among the good ones there are the best: professional diamond products are significantly superior in quality circles for home use. With proper care and proper use in everyday life, the normal diamond disc will serve for quite a long time. Bearing in mind that the professional wheel for angle grinder is five times more expensive, is it worth paying more?

Do not disregard the advice of the producer and the type of cutting. dry or wet. Depending on. which you want to cut, choose the appropriate type. It is easier to cut granite or concrete with the wet method.

Water, by cooling the disk, will give you more time to work, reducing the amount of dust emitted during cutting. Natural stone, marble and ceramics allow the use of combined discs, because both types of cutting are suitable for these materials.

Features of the installation of grinding discs on the machine and angle grinder

First of all, when installing a grinding wheel on any device is important to consider its characteristics. In particular, the installed wheel must not be radically different in

  • size. otherwise it will simply not fit in the protective cover;
  • to the diameter of the mounting hole. If a wheel with a larger or smaller diameter is to be mounted, it is essential to match the. In particular, if the planting hole is less than the required one, boring and grinding is performed. If, on the other hand, the mounting hole is larger than required, a special strip of paper should be used and wrapped around the arbor until it is an exact match;
  • it is not allowed to use a grinding wheel, designed for a smaller number of turns on a more powerful tool, as in any case it will lead to the appearance of cracks and other damages.

Installation of the grinding wheel on the angle grinder is performed on the spindle, it is important that the grooves of the spindle coincide with the flange flats. The wheel can only be fastened using spacers. one is placed on the bottom flange, the other is placed on top of the wheel before it is fastened. The main function of the pads on boltcutters and grinders is to provide an opportunity to unscrew the flange if the disk gets seriously damaged, for example, jams or breaks.

When it is necessary to abrade the surface, a special wheel with sanding surface is used, but it is not always possible to find a suitable one in terms of diameter and required characteristics. In this case, attachment to the grinding wheel can be carried out with a special adhesive, which is applied to a regular wheel. For optimal fixation the sandpaper in this case is used special. with an adhesive inner side. so it will not come off when sanding.

Installation of the grinding wheel on the machine can be carried out in several ways:

  • on the spindle or mandrel by means of flanges;
  • on the screw, as well as on the spindle or mandrel with a screw;
  • on adapter flanges by screwing or gluing.

In all cases, particular attention is paid to ensuring that the grinding wheel is securely fastened so that it does not come off during operation as well.

What you need to install the disc?

The installation of a disc on an angle grinder is usually a fairly straightforward process, in which a few rules must be followed. In order to produce it, it is necessary to arm yourself with the appropriate tool. a wrench, which will be needed to unscrew the nut. The next step after unscrewing it will be to replace the disk angle grinder or its primary installation. If it happens that the disc is jammed in the angle grinder, to remove it you will have to crush it and extract the remains from the gap between the supporting flange and the nut with a flat screwdriver or chisel.

Which side of the cutting disc you place it on may depend on several factors. Firstly, if the disc is not flat, there is only one way to put it, and the question disappears by itself. Secondly, if the circle is still flat can be guided by the label. if the angle grinder turns away from himself, he sets the label inside, if myself, then, respectively, outside. If this principle is not followed, you can expect undesirable results. disk breakage during sawing or just rapid wear and tear.

As for the direction of rotation of the disc on the angle grinder, it is primarily a safety issue. It is believed that concrete should be cut in the direction of disc rotation or towards yourself. Ideally, the sparks should fly to the side to the left of the person operating the tool. If this cannot be done, another position can be used where the shear of sparks is directed downwards. In any case, the sparks should not be allowed to fly away from the user, because if the disc jams suddenly, the angle grinder will be pointed in his direction.

In other words, to cut materials against the direction of rotation of the disc or away from yourself is extremely unsafe, because in the case of a wedge, there is a sharp throw of the angle grinder in the direction of the one who works. By the way, if you have additional questions about how to install the disk on the angle grinder, you can also view training videos, which are on the Internet today more than enough.

If you still have questions or need advice on changing and installing the discs just leave an application online or call us on the listed contact phone number and our specialists will tell you the right way. Our complete range of diamond discs is presented in the diamond discs section.

Read more:  Angle stop for circular saw. How to choose

The main difference between the two sides of the wheel

On any disc for the angle grinder you can easily see the differences in the two sides of the circle. One side is single-colored, it is coated with abrasive materials (for working with different types of metals). The front side has a special label that is written with information about the characteristics of the cutter.

But the main difference between the two sides of the wheel is the presence of a metal ring. This is an important design element that affects the safety of use, and therefore deserves a separate mention.

Discs for angle grinder are distinguished among themselves according to the following main features:

For the best understanding, let’s look at the main types of discs for angle grinder and define their application:

  • Cutting discs. These are the most commonly used consumables for angle grinders. Their main purpose is to work with metal, stone and wood. A variety of cutting discs for angle grinder are diamond discs. This is a heavy-duty tool for processing high-strength materials such as reinforced concrete, tile, porcelain tile, marble.
  • Grinding and skinning discs. As the name implies, this type of disc is used for grinding different materials, e.g. polishing stone, or removing (roughing) the top layer, e.g. to eliminate a layer of rust or old paint coatings.

How to remove and replace the disk of the angle grinder, what kinds of cutting wheels angle grinder video instructions

Angle grinder spare part (angle grinder). a replaceable cutting tool. Abrasive disc, rotating at high speed, cuts, grinds or polishes materials.

Abrasive discs are used for metal work, steel cutters for wood, and diamond-coated metal discs for stone. Special attachments. brushes, petal sanding discs additionally expand the capabilities of your angle grinder.

Below we will learn what kinds of discs there are, how to correctly remove the old and put a new one, as well as consider possible problems that arise in the process of replacement, and ways to solve them.

Types of discs for angle grinder: how to choose the right one

The industry produces angle grinders and their discs of standard sizes: 115, 125, 150, 180 and 230 mm. angle grinder from 180 mm are used for cutting stone. The most common size of machines for home and cottage. 125 mm, for them produce the most discs and nozzles.

Warning! Always match the disc to the size of your angle grinder. Smaller disc diameters are acceptable for the angle grinder. But it is extremely dangerous to remove the cover and put a disk of larger diameter!

We suggest dividing discs by purpose: cutting, grinding, sharpening and peeling. Consider each type in detail.

Grind metal

Inexpensive steel discs of Luzhsky factory

Cutting materials is the most common task of repair and construction work. A simple abrasive disc for metal will easily cut a steel bar, roofing iron or plastic. These discs are made of corundum (crystalline alumina) or electrocorundum (synthetic alumina).

When buying. we recommend to read inscriptions on a disc or on the package attentively. Metal cutting discs are indistinguishable from stone cutting discs.

diamond, disc, angle, grinder

Stone cutting

Budgetary disc for a stone is produced by Luzhsky factory

For cutting stone we recommend to take a special wheel. they use a different abrasive. silicon carbide. It can cope with white sand-lime brick and slate. And here red brick, glazed tile and concrete will not yield to it. it is necessary to take a diamond disk.

For home and cottage work, we recommend the Luzhsky factory’s circular saw blades. They wash and dust quickly, but cost only 15-20 apiece.

Unwinding wood

Blades that cut wood are very similar to the blade of a circular saw. Actually this is a disk for a circular saw, but seating diameter of 22.2 mm is suitable for the spindle of an angle grinder.

Warning! We don’t recommend home craftsmen to saw wood with a manual angle grinder. The tool, thrown back by the recoil, will cause serious injury.


As it is known diamond is a very hard mineral, so diamond discs can easily cope with red brick, porcelain stoneware, tile. The main material that is cut with diamond discs is concrete.

Handle with diamonds with care. the disc does not cut steel, it can not overheat. After only two minutes of concrete sawing, disc will be very hot. take a break. Slots around the circumference of the dry cutting disc for cooling.

There are discs for wet cutting of ceramic and porcelain tiles. Water cools the disc and washes away the hazardous dust.

How to choose the thickness of cutting discs

Every craftsman knows that the thinner the tool, the better. Less material is lost in chips, easier to cut, cleaner cut.

115 mm and 125 mm saw blades are available in thicknesses of 1.0 to 2.5 mm. The discs 150 and 200 mm are 1,8-4,0 mm thick. Pressed corundum powder is reinforced with synthetic mesh.

Warning! The thinnest disc (1.0 mm) when sawing “walks” and breaks easily, its pieces fly in all directions at high speed. Protect your eyes and hands.

Recommended cutting disc thickness 1.6 mm.

Sanding discs

The next most important work that craftsmen entrust to the angle grinder. grinding and polishing. The same treatment is applied to metal, wood, plastic and other materials.

Petal wheel for wood: dozens of sanding blades quickly cut shavings

The range of grinding discs is very wide. If you are restoring a cupboard, the flap wheel is the best tool for removing shellac layers. It grips large surfaces and cuts a lot of material in one pass.

The sanding pad is a plastic disc to which sandpaper is velcroed

The other handpiece is screwed onto the spindle of the angle grinder. Velcro is velcro-ed to it and attaches the sandpaper. For roughing. P60 or P80, for finer work. P120 or P180. With decreasing grit size, sanding smoothly transitions into polishing.

Polishing disc made of alpaca wool

Especially for polishing, there are nozzles in the form of pads, felt or cloth disks. Before use, they should be covered with polishing paste such as GOI.

Sharpening discs

Actually for sharpening tools there are special machines. sharpeners. Nevertheless, the rotating disc of an angle grinder can still sharpen a dull axe or cleaver, knife or scythe. Given the wishes of craftsmen, the industry produces sharpening discs for 115 and 125 mm grinders.

Sharpening discs turn an angle grinder into a sharpener

The discs are made of coarse abrasive compressed into a thick plate (more than 5 mm) with a convexity in the center. If you install such a disc on the spindle, the flange is hidden in the recess and does not protrude above the plane of the disc. Rough sharpening discs are also used for cleaning weld seams.

Scrubbing brushes and discs

Masters repairing houses from the middle of the last century are faced with the removal of oil paint from the walls. For this kind of work wire brushes are suitable.

No paint can resist such a steel cup

A brush is a cup with steel or brass wire strands around the circumference. They differ in wire thickness and hardness. for rough and fine roughing. The brush is screwed onto the spindle with an M14 thread.

A stone grinding disc slices off old cement evenly

After removing oil-based paint, it is necessary to grind a crooked concrete wall. Only an angle grinder can do this. The working surface of a diamond roughing disc is perpendicular to the axis of rotation. Synthetic diamonds cut and smooth concrete like sandpaper wood.

How to replace

Discs for angle grinder are consumables, they wear out rather quickly while cutting. A worn disc needs to be replaced. Let’s see how to do it on the example of our angle grinder “Interskol-115”.

Which side to put the disk on the angle grinder?

Which way you put the cutting wheel may depend on several factors. Firstly, if the disk is not flat, there is only one way of putting it and the question disappears by itself. Secondly, if the wheel is still flat, you can be guided by the label. if the angle grinder is turned away from you, then it is set with the label on the inside, if on yourself, then, respectively, on the outside. If this principle is not followed, you can expect undesirable results. disk breakage in the process of sawing or simply its rapid wear.

Read more:  How to unscrew a tightened nut on an angle grinder

As for which way the disc on the angle grinder rotates, it is primarily a question of safety. It is believed that concrete should be cut in the direction of rotation of the disc or on itself. Ideally, sparks should fly to the side to the left of the person working with the tool. If this is not possible, then you can use another position, when a sheaf of sparks is directed downward. In any case, you can not allow a situation where sparks are flying from the user, because in the case of a sharp jamming of the disc, the angle grinder will be directed in its direction.

In other words, it is extremely unsafe to cut materials against the direction of disc rotation or away from yourself, because in the case of a wedge, there is a sharp ejection of the angle grinder in the direction of the one who works. By the way, if additional questions arise as to how to install the disk on the angle grinder, you can also view training videos, of which there are more than enough on the Internet today.

If you still have questions or need advice on changing and installing the discs, just leave an application on the website or call the contact number listed and our experts will tell you how to act correctly. You can find our entire range of diamond discs in the diamond discs section.

How to Properly Install?

Placing a disc on the CD-ROM is not that complicated. It is possible to change it by simply following the instructions, although there are nuances.

First of all, you need to install the drive in the correct orientation. It is especially important if it is cut. Usually the side with the label showing the label and therefore the application is slightly different from the other side. It may not be revealed immediately, but with prolonged intensive work the difference will not only be noticeable. it will be obvious.

On the side on which the label is glued, put a wide pressure washer, it and the moving nut acting on it when tightening (installing the drive). the nut slides on the polished surface of the washer, without it it will be harder to tighten or unscrew, because the abrasive will firmly hold the nut and more force will be needed. This is especially important if the disc needs to be replaced quickly or if it has broken (jammed).

There is always a chance of disc failure, but installed correctly, it breaks only under heavy loads, the structure of discs takes into account the difference of loads on both sides.

With circular saws or other products that have teeth or a significant difference of two sides, the problem of how to mount, usually does not arise. A grinding disk, for example, cannot be mounted in reverse: it would be impossible to work with it.

Discs for stone, including diamond, have a special indicator of rotation in the form of an arrow: installing them, you must take into account where the rod will rotate.

When mounting, it is also important to consider the size of the disc. Safety should never be neglected and the protective hood must not be removed. it is better to choose a disc with an appropriate diameter. Sometimes a disc from a large machine is mounted on a “angle grinder” of smaller dimensions. However, a worn disc tends to cut worse, the working surface is limited to about half the radius of the disc, the structure is slightly different. The disc burns up faster and does less work. This operation can be justified if the diameter of the rod is the same. But it is not possible to change back.

Hello again Alexander.

Let me forgive me dear readers, for such a trite topic, but after buying a new angle grinder, I could not help but write this opus. By the way, I approach the question of safety with an angle grinder with particular care and tried to study this question in great detail.

Work with the angle grinder (angle grinder)

Therefore, below I will spend a brief excursus on my history with the angle grinder, in common parlance. angle grinder. I will italicize my sayings, so who is not interested, you can just skip this part of the article and continue reading below.

It was in the distant 1995. 1997. During my service in the armed forces of the Russian Federation. In my village in those years no one in our village had ever heard of such a tool as an angle grinder. And in the suburbs, where I served, these devices have already been.

And one day, or for some people not so much, I was helping a warrant officer with the repair of his car, well, maybe not his, not the point. And I had to cut something off. So he takes this shaitan machine in his hands and go ahead. I don’t remember the details of those events, but something went wrong, and bang, bang, barram, half of the disk sticking out of his neck. Blood, bandages, sanitation, and I was in silent terror.

In general, I got the first impression of this machine and I have forbidden ever to take such a machine in my hands.

Further, until about 2008, I carefully avoided such tools. But one day, again, not the most pleasant day, a relative asked him to help with the dismantling of heating in the house (the pipe metal 76th). Said that he borrowed an angle grinder from someone and it took half a day, no more. The experience, by the way, he has with the angle grinder, just like me, t.е. not at all.

I honestly pioneer, immediately suggested that he ask someone more experienced to help us, in terms of working with the angle grinder. However, my pleas were not heard, like, cope themselves.

And so, I support the pipe, so it does not bite, and a relative, with this shaitan machine cuts the pipe.

If I remember correctly, I think he cut through half the diameter of the pipe, again bites the disk and in front of my eyes, his leg is full of shards of disk. I slowly slip down the wall, being fully convinced that this device is specially imported into our country enemies, in order to create our demographic crisis.

That’s it, I thought, this is the second and last time I’m near a working angle grinder, but to take it in my hands. God forbid.

However, another 10 years passed and I still had to break my vow not to take in the hands of the angle grinder. Serious work I did not spend, but somewhere nail cut, somewhere a small tube, so slowly and drag. However, all the time somehow used not my tool. But it’s time to think about buying my angle grinder. And the question of safety work with it, went out to my first place.

And the first question about working with an angle grinder, I had this: So, how to cut with an angle grinder, sparks on themselves, or sparks from himself?

Re-read a bunch of forums, watched dozens of videos on this topic. There is no unequivocal answer. Somebody tells that it is necessary to cut with an angle grinder by sparks from itself, and others, with a foam at the mouth, prove the opposite. Whom to believe, it is not clear.

By the way, since I have several times used the angle grinder, then decided for myself that I, nevertheless, more convenient to work sparks from himself. At the same time, I was aware that if the blade of the angle grinder jams and gets ripped out of my hands, then, according to all the laws, it should kind of go in the opposite direction, i.e.е. at me.