How to replace the disk on the angle grinder

Angle grinder. what is it, application, choice, safety precautions

An angle grinder, or angle grinder, or angle grinder is a hand-held power tool for cutting, grinding, and other procedures for working metal, stone, and plastic. The device has a small cylindrical body, on one side of which there is a device for installing nozzles on the spindle, on the other side there is a handle for holding the device during operation. Inside there is an electric drive, powered from 220 V household network.

angle grinder differ in size, power, and the corresponding scope of application into 3 main types:

  • Large-sized. Dimensions 500×150 mm, power up to 3000 watts. Used for production. Capable of working continuously for a long time. Have a long service life.
  • Medium. Case dimensions. 350 by 130 mm, power up to 1.5 thousand. W. Used for professional work. Can be operated for several hours a day.
  • Small. Dimensions no more than 270 x 110 mm and the power of 1.2 kW. Designed for the home. Allowed to work for a limited period of time with pauses.

Sometimes those who are just starting to use an angle grinder reduce the basic rule of operation to deciding in which direction the nut is unscrewed to change the nozzle. In reality, this is just the technical side of maintaining the device. to use it successfully, you must first of all choose the right model for its purpose, convenience and power.

For example, the most comfortable operation will contribute to the correct selection of the device on such a number of parameters as:

  • The number of handles, their location, the presence of anti-vibration pads.
  • Motor power. The characteristic must match the work, as well as the types of nozzles used. Thus, the smaller the disk, the higher its rotation speed. However, the use of a wheel that does not comply with the manufacturer’s recommendations, can lead to a breakdown of the equipment and violations of safety rules.
  • High quality. Both the device itself and replacement tools must be of good quality. Since the work involves rotating mechanical parts, the destruction of which can lead to catastrophic consequences.

One of the main conditions for effective work with the angle grinder is compliance with safety regulations. First of all these include:

Before starting work with the angle grinder, it is necessary to prepare a place in accordance with the following set of requirements:

  • Select an even and sufficiently large free area.
  • For maximum reliability and safety of use of the angle grinder the workpieces to be processed are fixed to the bolted connection with the required side, and if necessary, unscrewed and reinstalled in accordance with the work plan.
  • If necessary, remove nearby objects that could be damaged by sparks, smoke or other operating factors.
  • Eliminate all flammable elements from the work area. solvents, fuel, rags and so on.
  • When working at the construction site with building material, prepare primary fire extinguishing equipment. sand, fire extinguisher, water supply.

The angle grinder must be operated in dry weather outdoors and indoors with normal humidity.

Using an angle grinder at home involves a risk of injury. Therefore, to keep yourself safe, the user should use the following means of protection while working:

  • Wear safety glasses or face shields to prevent entry of sparks or fragments of material and disk.
  • Use earplugs or building earphones to muffle sound.
  • Protect your hands with gloves or thick cloth gloves. In doing so, their material must not be old, worn, with dangling threads, and the products themselves must be accurate in size.
  • Use a respirator to prevent dust from entering the respiratory system.
  • Wear thick leather boots with metal toe pads to protect feet from sparks and falling objects.

In addition, the entire body must be securely covered with protective clothing made of thick fabric. The uniforms must not have loose parts which could become caught up in the rotating elements of the device.

To operate the angle grinder successfully, each user must know which way to unscrew the disc and how to change it at all. However, in addition to this basic requirement, before starting work, the device should be checked for serviceability on the following points:

  • Power cord and plug must be in good condition, without kinks or other defects.
  • The blade guard must be fitted firmly and in such a way that no sparks can fall on your clothing or face.
  • Gear knob must be in one piece, without cracks and tightly screwed in.
  • The drive disc must be positioned straight, without the slightest twist.

In addition, any user should know how to properly apply the angle grinder, which direction of disc rotation in relation to the material to be processed to choose.

Use of a torque wrench

To remove the clamping nut on the angle grinder, you can use an ordinary gas wrench. To do this, gently wrap the disc around the flange surface and carefully start unscrewing it. At the same time, it should be noted that when using this hand tool, you should not apply great force during the dismantling and unscrewing of the flange. Otherwise, when applying excessive force, there is a great risk of damaging the rotation lock of the angle grinder, as well as breaking the integrity of the nut itself.

How to Change the Wheel on an Angle Grinder with a Key

The grinding wheel (angle grinder) is one of its main working parts. The drive itself determines the use of the tool. This machine can be used for cutting, grinding or sanding various materials. Depending on the purpose of the discs are different: from abrasive shavings. for metal, steel machines and circular saws. For woodworking, with diamond pointing. for stone and tile, various brushes, brushes and sanding discs. for polishing various surfaces ,

The “sanding” disc is expendable; you can’t save money in the process. The disk is gradually erased (burned out) and needs to be replaced. When planning your work you need to be prepared for this and it is better to stock up on several removable discs in advance.

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How to install?

The installation of a disc on an angle grinder is not that complicated. You can change it by simply following the instructions, although there are some nuances.

First of all, you need to mount the disc on the right side. This is especially important if it is a cutoff. Usually, the side of the disc marked and therefore the application area is slightly different from the opposite side. It may not be immediately noticeable, but with prolonged intensive work the difference will not only be noticeable, but also obvious.

The wide clamping washer is located on the side where the label is applied, and the moving nut acts on it when tightening (inserting the disk). The nut slides on the polished surface of the washer; without this, it will be harder to tighten or unscrew as the abrasive will hold the nut firmly and require more force. This is especially important if you need to change a disc quickly or if it is broken (jammed).

There is always the possibility of the disc breaking, but when properly installed, it only breaks at high loads, the structure of the disc takes into account the difference of loads on both sides.

With circular saws or other products that have teeth or a significant difference between the two sides, the problem of how to mount them usually does not arise. For example, it is not possible to lock the grinding disk in reverse: it simply will not work.

Discs on the stone, including diamond discs, have a special rotation indicator in the form of an arrow: when installed, they must be set with regard to where the workpiece will rotate.

Disc size is also important to consider when installing. Safety should never be neglected and the protective cover removed. it is better to choose a disc with the right diameter. Sometimes smaller mills put a used disc in a larger unit. However, the working disc usually cuts worse, the working surface is limited to about half the radius of the disc, the structure is slightly different. The disk burns faster, but works less. This operation can be justified if the core diameter is the same. But it will be impossible to put it back.

No debris should fall on the disk during installation. Of course, the clamping nut may well squeeze small objects, something will press against the surface of the wheel. But an imperceptible distortion of the eye will lead to a displacement of the rotation plane and, as a consequence, a strong vibration of the entire mechanism can lead to a breakage of the disc, and, of course, in this case, you should not expect a precise cut.

The sander must be unplugged before installing the disc, which is a basic safety requirement, as a sudden start-up at this time is fraught with serious injury.

Changing disc. How to change replace disc blade in makita angle grinder

The jam nut must be unscrewed with the wrench that comes with the tool. To prevent movement of the rolling stock, it must be blocked by pressing a special button. Remove the nut by holding down the button.

After torquing the nuts, the disc is put on the freed rod pointing outward, and it must be ensured that it is seated.

A set of new grinders always includes a certain number of cardboard pads. when installing the disc, they should be placed so that they are between the disc and the clamping elements. Such spacers will help unscrew a broken or jammed disk.

Then the nut is tightened completely by hand and tightened with a special wrench. That’s it, the angle grinder is ready to go.

How to remove it?

Discs specifically designed for cutting burn out quickly and need to be replaced.

It is useful to mention once again the need to unplug the grinder. The work must be done with rapidly rotating parts and it is better to protect yourself.

If you need to replace a used disc, you need to follow a number of simple steps.

  • The disc is mounted on the spindle spindle with a threaded nut. Any angle grinder has a special wrench that has fixed pins on its horns that engage in the flange holes.
  • The spindle is locked with a special button, the pin when pushed into the hole in the gearbox, thereby locking it. Press the button with the right hand and at the same time with the left hand, unscrew the fastening nut with the wrench. If the nut has moved, it can be unscrewed manually. That’s it, now you can remove the disk.
  • There are times when, for some reason, the wrench was not on hand. What do I do? The easiest way. is to go out. But, as they say, this is not our method. You can also unscrew the clamping nut of the grinder without a wrench. 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 gear of the “grinder” with the button, move it out of place. Then you can unscrew it manually.
  • There are holes in the nut to secure it with studs on the wrench horns, and you can unscrew it by tapping with a hammer on a toothpick or a pin pointing into the hole.
  • Sometimes you can touch a nut just by tapping the edge of it with a hammer in the direction of rotation. In this case, however, the flange, especially the pin holes, may be damaged; it may not be possible to apply a wrench to such a nut later.
  • A very good result is obtained by using a nail to make a wrench. It is better to choose a large nail, from 100 mm. Use a hammer and pliers to attach the nail to the U-shape. Use a hacksaw or chisel to cut off the point and head of the nail. With this handy wrench you can try to remove the nut. You can bend the ends of such a wrench, then it becomes something like a wrench, but it takes a lot of work. You can also insert a collar, such as a hammer or other nail, into the arc formed by the bent nail.

How to change a disk if it gets stuck?

What to do if the bolsters are stuck in the circle? This can occur, for example, when chunks of cut workpieces clamp the rotating disc sharply. Often this will cause it to break.

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It can be very difficult to unscrew a nut tightened by spinning if the wheel bites.

  • One method would be to use two gas wrenches at the same time. The remaining discs will need to be broken apart with pliers. One wrench should be used to clamp the part of the rod that is under the disc, and the other. Unscrew the flange.
  • Sometimes you will need to disassemble the gearbox to gain access to the shredder rod wrench.
replace, disk, angle, grinder
  • Simple device. Cardboard or tin washers. gets rid of the jammed nut. They are often sold with a grinder. But over time, they can get lost or become unusable. Making homemade washers is not difficult at all. However, it is better to ignore them.

As a last resort, the flange can be sprayed with a metal hacksaw and then replaced with a new one.

Types of discs for angle grinder

The angle grinder is widely used in construction and repair operations. Discs for angle grinder differ from each other:

The choice of discs for the angle grinder involves knowledge and consideration of not only the workpieces to be processed, but also the capabilities of the tool itself.

Cutting discs

The most commonly used angle grinder wheels are also called abrasive. They are classified according to different features. There are discs for working with metal, stone, wood, etc. There is also a diamond disc, which serves to work with the most durable and hard materials (reinforced concrete, ceramic granite, tile, marble, granite and other natural and artificial stones).

Let’s give a brief description of each species.

The common feature for all severing discs is classification by outside diameter and thickness. The outer diameter comes in:

  • 115 mm for small domestic grinders;
  • 125 and 150 mm for medium power and weight angle grinders;
  • 180 and 230 mm for powerful professional tools.

disc thickness varies from 1 to 3,2 mm. This depends on the size of the bit: discs with a large diameter have a greater thickness; medium and small discs have any thickness. The choice of disc thickness is influenced by:

Metal cutting (abrasive) discs

These discs are suitable for sheet steel (disc thickness from 1 to 1.6 mm) and long steel products such as rebar, round bars, channels, angles and others (disc thickness from 2.5 to 3.6 mm). There are special bits for working with stainless steel, aluminum, cast iron and other metals.

How to Change a Grinder Wheel | 4 Different Ways

This is indicated on the surface of the disc by a marking and a colored stripe. Abrasive discs consist of several layers of fiberglass mesh, on which a bakelite abrasive material (silicon carbide, corundum, electrocorundum) is pressed under high pressure from both sides. Then the reinforced abrasive discs are placed in a heat treating oven to gain strength. Set temperature of heating. 200 degrees. There the mass sintered and becomes strong and resistant to splintering.

Abrasive stone discs

They are absolutely identical to discs for metal and differ only in the abrasives used.

For wood

They are made of high strength steel and have sharp teeth on the outer diameter. These tools work on the principle of a circular saw and are quite dangerous in operation. It is recommended that the angle grinder should be permanently fixed with a special attachment.


They are used for cutting high-strength materials in natural and synthetic stone.

There are different kinds of diamond discs for concrete, reinforced concrete and stone. They differ from each other by the fractionality of the diamond coating and the type of cutting edge. solid, with large or small cuts, notches. It is important to know that diamond discs are not used for metal work. It is difficult to understand the function of a diamond disc by its appearance. The best solution is to consult a salesperson or carefully study the appendix to the package before buying.

Some manufacturers of diamond discs color the front side with paint depending on the material for which they are designed:

  • green. for granite;
  • The yellow one is for plaster and tile;
  • Blue. for marble and concrete
  • gray. for granite and tile;
  • orange. for brick.

Diamond disc with segmented cutting edge used for dry cutting of stones. Blades with a solid cutting edge require water cooling. Turbo wheels with slots in the wheel body operate at a higher RPM than segmented blade wheels.

Grinding and Roughing

Grinding discs are divided into four types:

  • Special wire wheels are used to remove rust and stubborn dirt.
  • Diamond bowl versions are used to polish stone workpieces.
  • Disc discs of plastic or rubber are used to polish metal surfaces. On plates can be attached replacement discs with sandpaper, felt, sponge, cloth.

Most grinding discs work with special pastes or liquids that include the finest abrasives. These attachments grind surfaces of any material, including automobile body parts in car repair shops.

How to determine which side of the disk on the angle grinder

Angle grinders today are available in almost every home workshop. This is justified by the fact that with its help you can solve many problems for construction and repair work. Consider what side to put drive on the angle grinder to use tools could be long and safe. Let’s get acquainted with the ways of tools removal with a special key and alternative devices if the nozzle is undamaged or damaged and in case of jamming of the mechanism.

How to remove the disk from an angle grinder without a key correctly?

The best ways to remove a disc from an angle grinder without a wrench

The angle grinder is a universal tool in every sense, with which you can cut wood, steel profiles, work on stones and concrete, perform roughing and sanding work, as well as sharpening hacksaws for other tools.

Each of these operations requires a specific wheel.

For example it is not possible to grind a surface with a thin cutting wheel for angle grinder, because the nozzle will get out of order very quickly. How to correctly remove the disk from the angle grinder and put back in when grinding or shelving the circle?

How to remove a disc from an angle grinder with a wrench?

If the special key, which is attached to the angle grinder, is not lost, then it will be easier to cope with the task. Those who are interested in how to remove the disk from the angle grinder, experts advise to first fix the spindle. This is where the disk sits and is pressed with the flange. Use an open-jaw wrench to remove it. To make this technically possible, the flanges are provided with special holes into which the pins of the wrench can be inserted.

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To secure the spindle, the button on the housing on the opposite side of the disc must be pressed. Do not release the safety catch with the crescent wrench during operation, otherwise the spindle will continue to turn. If the disc in the angle grinder is turned clockwise, the wheel wrench must be turned counterclockwise, and vice versa. It is important that the flange gives way and moves out of the way. It can now be unscrewed completely and set aside. Then remove the old disc and replace it with a new one.

Jammed disk nut. how to unscrew it?

Remove the disk from the angle grinder, if for some reason bitten, it is not so simple, especially not to damage the cutting element or directly to the power tool. In addition, we suggest considering several ways to solve the problem.

Replacing the disk by reversing the movement

This method has several advantages. you can do all the work without using a wrench and even with a broken spindle lock. Beginners when working with an angle grinder very often mistakenly believe that if the stopper is broken, it will be almost impossible to unscrew the nut. But this is really not the case and you don’t even need a wrench. The idea is that the abrasive wheel should begin to rotate in different directions. Also wear tight gloves, and repeatedly hit the cutting edge of the wheel. This is how you can provide variable motion in different directions. As a rule, a few sharp blows are usually enough to easily unscrew a jammed nut.

With socket head and open-end wrench

In this case, it is necessary to slightly modify the standard tools that are available. a socket wrench at 1.7 and a socket head, which has the size of 2.4 centimeters. The thickness of the spanner will be ground to 0.4 cm. There are four protrusions on the head that fit into the holes in the retainer nut. After the preparatory work, the wrench should be placed in the free space under the cutting wheel, and the head should be put on the flange of the angle grinder and turn it in the opposite direction from the direction. Then you can easily remove it and put a new one in.

This is one of the easiest ways to remove the disc from the angle grinder without using a wrench. The nut that locks will be heated with an industrial hair dryer or even a gas torch. After that you can unscrew the flange and it’s much easier to do. But there is still a risk of damaging the plastic part at the gearbox or angle grinder.

The best way to do this is to use a nail with a length of 10 cm. It should be bent into a U-shape so that the ends fit freely into the holes of the clamping flange. Remove the flat bar and point, and then insert a nail into the hole and unscrew the retainer. If your hands are not strong enough, you should add a screwdriver or a nail as a lever.

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With a gas wrench

Use of this tool is justified by the increase in applied torque thanks to the extended arm. It is much easier to loosen a jammed connection with a gas wrench, but when removing the jam, remember that with excessive force there is a great risk of damaging the spindle lock or even the jam nut.

With impact wrench/drill

To unscrew the disc on the angle grinder without using a wrench, you can use a peorator or even a drill, but first switch it to the chipping hammer mode. As a working tool, use a drill of a suitable size, usually 0.6 cm. The drill should be set against the edge of the hole of the clamping nut, lock the spindle movements, and by briefly turning it off, move everything out of the way. This method allows you to unscrew even very complicated jams.

This method is very similar to the one described above, but here you can use a suitable metal bar or even a chisel. Having secured the head of the spindle, knock on the edges of the clamping hole in the direction of the movement of the wheel. Slightly move the retainer out of the way, and then you can unscrew it by hand. But this method is not the most harmless for the electric tool, because the mounting holes for a standard spanner will be damaged.

Destruction of the cutting disc

You can unscrew the jammed nut by completely destroying the cutting wheel. If it is already damaged, you can break it down by hand, but more often than not. The surest option is to take a metal blade or hacksaw and saw everything off. This will leave you with a center ring and hard-to-reach pieces. When you find a suitable plate, then clamp it in a vise, grind the rest of the grit (abrasive) against it so that only a metal ring remains. After that it will be easily unscrewed with the simplest wrench.

There is also a more radical way to unscrew a jammed clamping nut, namely sawing it. It can be resorted to in the most extreme cases, and of course you can find a new part, but it will need to spend your time and money. Very often replacement clamping elements are included with the angle grinder.

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

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

Among grinding discs, there are four basic subtypes. petal, wire, diamond and sanding discs on a bakelite base (straight, profile T41 and dished, profile T27).

How to change the disc on an angle grinder?

  • Petal discs are made of sandpaper. Its main purpose is to remove existing coatings, such as old paint, primer or a layer of paint coat. Also, discs of this type are used for sanding wooden products.
  • Wire discs are used by craftsmen to remove rust. They can also remove other types of stubborn dirt.
  • Diamond discs are used for stone polishing.
  • Discs of discs are made of plastic or rubber and are used for polishing metal surfaces.
replace, disk, angle, grinder

Please note: most discs are coated with a special paste or lubricant that contains the finest grit. They are mainly used in the grinding of surfaces, such as car body parts.

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