How to install a grinding disc on an angle grinder

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

When rotating at idle speed, it is difficult to encounter such a problem. Particularly when working with lightweight wheels and tools with soft-start function. However, after increasing the RPM and making contact with the surface to be cut, the following occurs:

  • If there is resistance from the material, the wheel’s rotational angular velocity is drastically reduced and the wheel is braked.
  • The motor continues to run for some moments at the same speed, dragging the gearbox and the spindle along with it.
  • The retainer nut by inertia tightens harder on the threads of the spindle head, thereby pressing the cutting disc in.

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

  • Large wheel size.
  • High tool power.
  • Massive rotor.
  • A sharp increase in cutting depth, t.е. Increase of resistance.

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

How to take precautions

If the problem of excessive self-tightening of the nut has already occurred, there are three ways to prevent it from happening again, with varying degrees of effectiveness:

It is also possible to apply several of these at the same time.

Owners of low-power (up to 1800 watts) and light angle grinders do not have to worry. They are not affected by this problem.

Types of discs for angle grinders

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

Selection of discs for angle grinder requires knowledge and consideration of not only the machined workpieces, but also the capabilities of the tool itself.

Cut-off wheels

The most used discs for angle grinders, also called abrasive. They are classified in different ways. There are discs for working with metal, stone, wood. There is also a diamond disc, which is used to work with the toughest and hardest materials (reinforced concrete, ceramic granite, tile, marble, granite and other natural and artificial stones).

Let’s give brief characteristic for each type.

General feature for all cutting discs is classification by outside diameter and thickness. There is an outer diameter:

  • 115 mm for small domestic grinders;
  • 125 and 150 mm for medium power and weight angle grinder;
  • 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 larger diameters have larger thicknesses, medium and small diameter discs have any thickness. The choice of disc thickness is influenced by:

Cutting (abrasive) discs for metal

These wheels are used to work with sheet body steel (disk thickness from 1 to 1.6 mm) and long steel products: rebar, round bar, channel, angle and other types (disk thickness from 2.5 to 3.6 mm). There are special bits for working with stainless steel, aluminum, cast iron and other metals.

This is identified by markings on the disc surface and a colored band. Abrasive discs are several layers of fiberglass mesh on which bakelite abrasive material (silicon carbide, corundum, electrocorundum) is pressed on both sides under great pressure. The reinforced discs are then heat treated in the furnace to obtain their strength. Set heating temperature to 200 degrees. There, the mass is sintered and becomes hard and resistant to shattering.

Abrasive discs for stone

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

For wood

They are made of high-strength steel and have sharp teeth on the outside diameter. These attachments work on the principle of a circular saw and are quite dangerous in operation. It is recommended to fix the angle grinder permanently with a special device.

Diamond

They are used to cut high-strength materials made of natural and artificial 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 a diamond disc is not used for metal work. It is difficult to understand the purpose of diamond discs by their appearance. Your best bet is to speak to a sales consultant before buying or to study the enclosed package carefully.

install, grinding, disc, angle, grinder

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

  • Green. for granite;
  • Yellow. for plaster and tile;
  • The blue one is for marble and concrete;
  • gray. for granite tiles and tiles;
  • orange. for brick.

Diamond disc with a segmented cutting blade is used for dry-cutting of stones. Wheels with a solid cutting edge require water cooling. Turbodiscs with slots in the wheel body operate at higher rotational speeds than discs with segmented blades.

Grinding and Roughing

Grinding wheels are divided into four types:

    petal (abrasive) discs remove old paint, primer or varnish, sand wood.

  • Special wire wheels remove rust and persistent dirt.
  • Diamond modifications in the form of a bowl polish stone products.
  • Discs of plastic or rubber are used to polish metal surfaces. It is possible to mount interchangeable discs with sandpaper, felt, sponge, cloth on plates.
install, grinding, disc, angle, grinder

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

How to choose a wheel for an angle grinder

When choosing the right attachment for the angle grinder, you need to pay attention to the following points:

  • Choose the required disc diameter (it must not exceed the maximum allowable size of the nozzle of a specific angle grinder model, which is limited by the size of the protective hood) and the area of its use. The area of use is indicated by the name of the blade: cutting, grinding, sharpening, etc. The type of blade can tell you what kind of material it is used for. But often manufacturers designate the type of material with visible stripes of a certain color: green. concrete; blue. metal, etc. Sometimes there is a clear symbol on the disk for the type of material the bit is designed to work on.
  • Study the marking on the disc itself. It is made up of numbers and letters of the Latin alphabet. A. corundum; AS. electric corundum; S. silicon carbide. Next are the numbers indicating the grit of the abrasive inclusions. This indicates the thickness of the material to be removed. Larger (coarser to the touch) grit sizes are used for non-ferrous metals. They work on soft surfaces with good performance. The fine-grained discs are used for cutting, snagging, grinding of workpieces made of various steel grades. At the end there are letters that indicate the hardness of the bonding material. The hardness increases as the number of the letter increases. Important rule: the softer the bonding material, the harder the material, the harder the bit can work with. And vice versa, the harder the disc bond. the softer the workpiece material should be. The final part of the inscription is made up of numbers indicating the maximum speed. Its value is given in revolutions/minute or metres/second.

Be sure to study the marking on the disk: all the information you need is indicated here

Read more:  Do Not Unscrew Nut On Angle Grinder

How to remove a jammed disc from an angle grinder

Using new nuts solves the disc removal problem, but what to do with an already bitten disc? It is not always possible to remove the disc even when it is installed correctly. Practice tells us different ways to solve the problem. It is possible to clamp the locking device and hit it through the nut holes in the direction of unscrewing. This is only possible if the ratchet is undamaged. But the clamp may not be able to withstand this kind of solution and break.

The second method makes more sense. Under the jam nut and bottom support washer there is a gearbox shaft with chamfered chamfers. The bottom support washer is put on them. You can’t fit a standard wrench in there. it’s very narrow. But it is possible to take an ordinary open-ended wrench for “17” and grind it on both sides.

The sharpened wrench will enter the gap, fit over the chamfers of the shaft, and lock it in place. Now any wrench will unscrew any nut, and the disk or its remnants are removed from the angle grinder.

Which side is suitable for insertion

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

  • You can pay attention to the label. If the angle grinder works on its own, namely, to rotate away from the control, in this case, the disk must be installed with the label inside. If it rotates in the opposite direction, then the label must be installed on the outside.
  • Can be put in without paying attention to the label. But then you can expect the most unpredictable results, such as the usual disc and angle grinder breakage. In this case, experts say that such negligence can lead to the fact that the angle grinder simply jams and there is no need to talk about safety in this case.

In order to determine in what direction the angle grinder should spin, it is necessary to refer to the information on safety. Concrete in particular has to cut into itself.

In this case, the sparks will fly from the side, namely from the operator. In general, cutting materials in the direction away from yourself is not safe, because in the case of jamming, the angle grinder with a disc will fly exactly to the one who operates it. This must be taken into account.

Which side to put the disc on the angle grinder, what to do if the disc 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 a variety of materials, which include stone, reinforced concrete, concrete, marble, and many others. In beginners at first a number of questions may arise, among which the most frequent: 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 rotate the disk on the angle grinder. Let’s try now to give a short answer to all these questions.

  • Install a gasket made of newspaper 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 installed disc, and the nut is screwed on top.

This piece of paper was a stumbling block, so the Safety Inspectorate kept talking about the harmfulness of such a decision.

In the same way the representatives of the bodies of safety technology and the installation of gaskets from all the other in:

But there is a solution, which does not contradict all the safety rules and allows you to mount and dismount the disk normally.

It is a special nut which consists of 2 parts. nut and pressing washer. Using such a nut does not require any pads, so that the disk does not jam with it.

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

So you can replace the jammed disc, but this is an extremely awkward operation for the one person.

There is also a suggestion to clamp the disk by hand and unscrew it in this way. Maybe, but it is unlikely to change the broken discs this way. 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 keep the disc firmly in place on the shaft of the tool and are quick and easy to remove for disc changes.

Diamond tools: tips for choosing

The diameters of discs for angle grinder are from one hundred and fifteen to four hundred mm.

If the need arises, even glass can be cut with an angle grinder.

Diamond discs are available for special applications. When buying a product, carefully read the information on the packaging. Traditionally, manufacturers indicate for what mi work this disc is designed. It is better to use diamond disc in correspondence with manufacturer’s recommendations. it will prolong its lifetime.

High-density hard discs have a softer-alloy body. When wiped, they release a fresh batch of diamonds to replace the worn-out ones. Products for the soft have a hard alloy body, as the diamond part is worn slower, and the wear process of the body and the diamond part must go evenly.

If diamond tool became badly cutting. don’t hurry to change it.

The characteristics of the product can be returned by making cuts of homogeneous abrasive (most often yuzuetsya brick).

When choosing a diamond disc for your angle grinder, do not forget about dimensions.

The range of cross sections varies 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 there are also the best among the good ones: professional diamond products are of much higher quality than grinding discs for home use. With proper care and proper use in the home an ordinary diamond disc will last quite a long time. Taking into account that a professional disc for angle grinder is five times more expensive, is it worth paying more??

Do not neglect the manufacturer’s advice and with regard to the type of cutting. dry or wet. Depending on the. diameter of the seat hole to be cut, choose the appropriate type. It is easier to cut granite or concrete with the wet method.

Water, by cooling the disk, will give more time to work, reduce the amount of dust emitted when cutting. Natural stone, marble and ceramics allow using a combined disc, because both types of cutting are suitable for them.

Features installation of grinding wheels on the machine and angle grinder

First of all, when installing a grinding wheel on any device, it is important to consider its characteristics. In particular, the installed circle should not differ radically in:

  • size. otherwise it simply will not fit in the protective casing;
  • diameter of the planting hole. In the case of mounting a wheel with a larger or smaller diameter, it is necessary to achieve full compliance. In particular, if the planting hole is smaller than required, then boring and grinding is performed. If the seating hole is larger than necessary, use a special strip of paper, which is wrapped around the seating of the mandrel until the exact match;
  • It is not allowed to use the grinding wheel, designed for a smaller number of turns on a more powerful tool, as this will in any case lead to the appearance of cracks and other damages.

Grinding wheel installation on angle grinder is performed on a spindle, it is important that the grooves of the spindle coincide with the flange flats. Fix the wheel can only use spacers. one of them is placed on the bottom flange, the other is placed on top of the disk before securing it. The main function of the spacers on angle grinders and grinders is to make it possible to unscrew the flange if the disc gets seriously damaged, for example, jammed or broken.

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

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

  • on the spindle or mandrel by means of flanges;
  • on the screw and on the spindle or arbor with the screw;
  • on the adapter flanges with screws or adhesive.

In any case, special attention is paid to the reliability of the attachment of the grinding wheel to prevent it from slipping off and in the process.

What is required to mount the wheel?

Installing the disc on an angle grinder is usually a fairly simple process, in which you need to follow a few rules. In order to make it, you must 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 happened that the disc is jammed in the angle grinder, to remove it will have to crush it and remove the remains from the gap between the supporting flange and nut with a flat screwdriver or chisel.

Which way you put the cutting disc may depend on several factors. Firstly, if the disk is not flat, you can put it in only one way, and the question disappears by itself. Secondly, if the circle is still flat, you can be guided by the label. if the angle grinder turns from itself, it is installed with the label inside, if on itself, 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 which way the disc on the angle grinder rotates, this is primarily a safety issue. It is believed that concrete should be cut in the direction of the disc rotation or towards yourself. The ideal position would be for the sparks to fly to the side to the left of the person working with the tool. If this cannot be done, another position can be used where the shear of sparks is directed downwards. In any case, sparks must not be allowed to fly away from the user, because if the disc jams suddenly, the angle grinder will be pointed in his or her 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 is working. By the way, if there are additional questions about how to install the drive 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 discs, just leave an application on the website or call the contact number listed, and our experts will prompt you how to act correctly. Our entire product range of diamond discs can be found under diamond discs.

Features of grinding circles installation on the machine and angle grinder

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

  • size. otherwise it simply will not fit in the protective cover;
  • diameter of the mounting hole. In the case of mounting a circle of larger or smaller diameter, it is necessary to achieve full compliance. In particular, if the fitting hole is smaller than the required one, then boring and grinding is performed. If the planting hole is larger than necessary, use a special tape made of paper, which is wrapped around the planting place of the mandrel until the exact match;
  • It is not allowed to use a grinding wheel, designed for a smaller number of revolutions on a more powerful tool, as this will in any case lead to the appearance of cracks and other damage.

the grinding wheel is installed on the angle grinder on the spindle, in which case it is important that the grooves on the spindle match the flange flats. To fix the wheel, you can only use spacers. one of them is placed on the bottom flange, the other is placed on top of the disk before fixing. The main function of the spacers on bolt-grinders and grinders is to make it possible to unscrew the flange if the disc gets seriously damaged, for example, jammed or broken.

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

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

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

In either case, special attention is paid to the reliability of the grinding wheel fastening to prevent it from slipping off and in the process.

What you need to install the disk?

Installing the disk on the angle grinder, as a rule, is a fairly simple process in which you need to follow a few rules. In order to make it, you must be armed with the appropriate tool. a wrench, which will be needed to unscrew the nut. The next step after unscrewing it, will be the replacement of the disk angle grinder or its primary installation. If it happens that the disc is jammed in the angle grinder, to remove it you have to crush it and extract the remnants from the gap between the supporting flange and the nut with a flat screwdriver or chisel.

Which way you put the cutting disc may depend on several factors. First, if the disk is not flat, there is only one way to put it and the question disappears by itself. Secondly, if the circle all the same flat can be guided by the label. if the angle grinder turns away from himself, he set 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 of the disk.

As for the direction in which the disk rotates on the angle grinder, it is first of all a safety issue. It is believed that concrete should be cut in the direction of rotation of the disk or on itself. Ideally, the sparks should fly to the side to the left of the person working with the tool. If this is not possible, then 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, 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 further 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.

Read more:  Metal facing machine from the angle grinder with their own hands

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 phone number and our experts will tell you how to act correctly. Our entire range of diamond discs can be found in the diamond discs section.

Fixing the circle correctly

First of all it is advisable to ask the “advisors” not to call the flange a washer. Further: if you have this item “with bumps” it is worth throwing it away and buying a normal one without bumps.

If placed with the inner metal ring against the gearbox, the clamping flange will press on the part that is not protected by the metal. If excessive force is applied, the abrasive may burst in the center during clamping, which goes unnoticed. The wheel may break in the process. Consequences? With a high probability. a serious injury.

It happens that the wheel is jammed, it is very difficult to unscrew it. If it was originally placed with the ring and the pattern outward, it will be a little easier to do. The explanation is: the flange slides on the nut, thus reducing the friction.

Petal circles are a separate topic. This product is cup-shaped. The center and the edges are not in the same plane. If even technically this type of circle is “shoved” with the pattern outside and the petals are not in contact with the protective casing of the device, it remains unclear how to work with such a unit. over, the metal ring on this type of wheel is usually present on both sides. Conclusion: it is not necessary to be guided by this parameter.

The advantages of mounting a disc with a ring on the angle grinder

There is no exact direction, which must be adhered to when installing the wheel on the grinder. But, as already described above, if you put the cutter “face” outward, the removal process will be easier, because the abrasive side is more difficult to catch on the surface.

In addition, there are several other advantages, which will be useful to know about.

Guarantees straight installation on the shaft

The metal ring placed on the disc increases the support area, and therefore the pressure during tightening becomes uniform. This way, the disc will sit on the desired surface as evenly as possible. The possibility of misalignment will be eliminated. This directly affects not only the smoothness of the cut, but also the safety of the user. the abrasive will not fly to pieces if the angle grinder does not catch.

Ease of installation

Another advantage of installing the disk face outward. the user will always be able to see which attachment is installed on the angle grinder. To work with stone or metal, you need to use different discs, and if you make a mistake, you can get serious injuries due to the breakage of the cutting part.

For example, if you use a disk on metal to cut concrete, the abrasive simply can not withstand the load and will fly in pieces in different directions. Therefore, the installation variant under consideration provides not only convenience, but also safety.

Instructions manual

On some models of grinders, for example, Metabo, it is indicated that the metal flange of the abrasive should be adjacent to the supported flange of the angle grinder. It is not a coincidence that manufacturers recommend mounting the drive in this way, because they expect safety when operating the tool.

Important! Improper assembly is life-threatening.

Tips

If you had to use a gas wrench, you must remember about the very powerful arm of such a wrench and the force applied to parts of the “angle grinder”. If you are not careful, you can break the spindle lock or damage the gearbox.

All manipulations with the angle grinder disc should be performed with the power supply completely disconnected (the plug must be removed from the socket). Any unintentional activation of the start button causes the electric motor to start and the spindle speed is very high. Injury cannot be avoided.

Work with the “angle grinder” involves a lot of waste in the form of metal or wood chips and dust. Before you start working, you need to wear special safety glasses: they will protect your eyes from the splinters of the cutting wheel itself in case it jams and destroys.

Goggles are not only necessary as a safety element. If your eyes are protected, you can pay more attention to the actual work of the angle grinder, to ensure the right cut or to choose the right mode of operation. It enables more efficient use of consumables (cutting-off wheels), minimizes emergence of abnormal situations with disc jamming or its destruction.

A mask that completely covers your face will substitute for glasses; it is especially important for a visually impaired craftsman who wears dioptric glasses that are not suitable for protective glasses.

The blade on the angle grinder can be mounted “on” or “off” depending on the direction of rotation and, therefore, the chip flow. In work it has no basic difference. However, an “angle grinder” with the wheel “on itself” tends to jump out of the cut forward when the disc is jammed, not on the one who is using it. This is especially important when working with powerful tools, but even a small angle grinder can be a serious hazard.

A specially installed extension cord with socket, preferably without grounding, can help you quickly stop a machine that has been ripped out of hand.

“Angle grinder”. a tool of rough treatment and seek 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 by other means.

To work without clamps and jamming it is better not to cut long metal pieces to the end, leaving 1-2 mm of metal in the cut: they can be easily broken off afterwards, it will practically have no effect on the quality of the workpiece.

It is better to place small workpieces in a vise or clamp them to a workbench or other reliable horizontal surface. The quality of the cut and safety depends on the tightness of the hold.

On how to properly put the disk on the “angle grinder”, you can see in the following video.

What to do if the angle grinder is jammed (bogged) disk?

Everyone who has experience in intensive work with angle grinder at least once must have faced such a situation.

Usually, it happens if the disc is jammed between the parts, it stops or breaks, and the motor of the angle grinder continues to rotate and thus irreversibly tightens the nut.

So what can you do if the disc on the angle grinder is jammed??

Every craftsman has his own secrets.Especially for you, we have learned a few of them, and now we will share the most common ways out of the situation.

remove the disk from the angle grinder

First, find out in which direction the nut should be unscrewed.

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

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

install, grinding, disc, angle, grinder

Here’s what to do: Destroy the remains of the disk, use one wrench to fix the washer behind the disk, the other to unscrew the flange.

Remove the disk from an angle grinder

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

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

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

remove the disk from the angle grinder

This method is used in extreme cases.

When no other methods help, you can try to saw the flange with a tool like a hacksaw for metal, and then buy a new one in a specialized store.