How to Install the Cut-off Wheel on an Angle Grinder Correctly

Heating nut

The nut can be heated with a gas torch, hot air gun or blowtorch. The heated flange can usually be unscrewed with a standard wrench for an angle grinder.

Purpose of discs and attachments

Discs for an angle grinder differ in purpose for:

  • detachable;
  • stripping
  • grinding;
  • sharpening.

Choosing and Replacing Discs for Angle Grinder

Angle grinder (angle grinder), in common people called “angle grinder”, is widely used in construction and in everyday life during repairs. It can be used to carry out many different technological processes. In order to choose the right tool for performing a certain type of work, you need to familiarize yourself with what kind of discs and attachments for an angle grinder are. The tool for this device is selected by size and purpose.


To sharpen the tool, grinding machines (sharpeners) are usually used. But if you do not have the latter, but you have an angle grinder, then you can purchase a sharpening (grinding) wheel for it, with which you can easily sharpen almost any cutting tool.

install, cut-off, wheel, angle, grinder

The main difference between sharpening wheels and cut-off wheels is their thickness (at least 5 mm).

Using a puncher

Some owners of an angle grinder, in a situation where the clamping nut is jammed, install a “chisel” or “jackhammer” nozzle into the hammer drill, insert it into the hole of the flange at an angle and turn on the hammer mode without rotation. Accordingly, the stop button must be pressed. Just a couple of gentle clicks with a perforator are enough (so as not to break the shaft retainer), and the nut will begin to turn.

With a gas wrench

This method is considered not entirely safe, since the stopper can be broken, although in most cases, it is possible to unscrew the nut. To avoid breaking the spindle lock, do not apply too much force to the gas wrench. Retainer is designed to withstand the force of a standard wrench.

An overly tightened flange can be unscrewed using 2 gas wrenches. To do this, break off the protruding ends of the abrasive wheel with pliers so that you can reach the bottom flange with the first gas wrench. Next, tighten both flanges with wrenches and turn them in opposite directions (taking into account which thread on the spindle is right or left).


If it is necessary to remove a layer of paint or other application, as well as rust from any surface, use a brush. They are disc-shaped or in the form of a bowl with built-in metal wire.

The wire in these attachments can be twisted or loose. Its thickness can also be different. The thicker the wire, the coarser the roughing is used for the roughing disc or bowl, and vice versa.

How to properly change a disc to an angle grinder

Since wheels for an angle grinder are consumable, sooner or later they have to be changed. They are attached to the spindle of the angle grinder using a clamping flange (nut) with an M14 thread. To unscrew it, a special open-end wrench with pins on one side must be included with the angle grinder.

So, to replace your tool with an angle grinder, follow these steps.

  • De-energize the device by unplugging the power plug.
  • Lock the spindle of the angle grinder using the button located on the front of the housing. When the button is pressed, the stopper enters the hole of the disk installed in the gearbox, which fixes the spindle in a stationary position.
  • Insert the pins of the key into the holes on the pressure flange.
  • While holding the latch with one hand, turn the wrench to the left (counterclockwise) with the other hand until the nut comes loose. Then it can be unscrewed without a key and removed from the shaft. In this case, the spindle of the angle grinder rotates clockwise. But in which direction to unscrew the nut if your apparatus rotates the shaft counterclockwise? Remember: the clamping flange should always be unscrewed in the direction opposite to the rotation of the shaft.
  • Now you can change the tool after removing the old one. If you notice that dirt has accumulated inside the casing, then you should remove the lower flange and use a steel brush to remove dirt from all surfaces.
  • Screw the flange onto the shaft by hand. Tighten the nut until you can no longer turn it without a key. After that, holding the stopper, tighten this nut with a wrench, but no more than a quarter of a turn, otherwise the disc will begin to deform.
  • After carrying out the above actions, the replacement of the tool is considered complete.

    Do not put a wood disc on an angle grinder

    If you do not have a jigsaw, circular saw or chain saw, and you need to work with wood, then you can completely do without an angle grinder, as many summer residents think. Cutting planks and stocking firewood with an angle grinder. very dangerous, especially with the protection removed.

    And since there are lovers of such a thing, then I am writing a warning note. But words. this is one thing. other. So I wasted my time and sawed wood with the scariest config. angle grinder with increased speed for the disc and removed protection.

    Angle Grinder. a rough and powerful tool, capable of sawing both a thick board and a log into a light one. Only the diameter of the disc matters. The larger it is, the thicker the workpiece can be cut.

    I set up an experiment on the most common and most popular angle grinder with a 125th disc.
    To begin with, I recommend running your eyes through this article to understand what risks you are taking. However, the case described there is not associated with sawing wood (a disc hits metal even more than wood), but with non-observance of safety precautions. However, nothing will save you from breaking the disc due to the overestimation of the load in relation to its ultimate strength.

    Unfortunately, on the “interskolovskaya” angle grinder, the manufacturers have supplied unregulated protection with a minimum gap, so your hands itch to remove it.

    If you are a risky person and you know what you are going for, then you need:

    • set the disc in such a way that the direction of rotation of the spindle corresponds to the arrow drawn on the disc, the revolutions of the angle grinder must be significantly lower than those indicated on the disc
    • hold the angle grinder by the handle and as far away from the blade as possible
    • tighten the retaining disc nut on the spindle tighter
    • put on overalls and a protective helmet (transparent with a visor, like a firefighter), since all the sawdust will fly strictly in the face and by the collar, the torso must be protected under the clothes with a sheet of metal (yes, a bulletproof vest)
    • checking all wood pieces for metal objects such as nails and staples
    • watch your legs, arms and body so that you do not injure yourself with the tool in case of an unexpected jerk
    • do not hold the angle grinder on or in front of you, your body must be away from the tool
    • take constant breaks from work: sawed-off, sawed-off, so as not to let the disc warm up

    You cannot take a large disc (like 150) on a small angle grinder with the protection removed. there is simply nothing to hold on to with the right hand.

    And I will repeat myself. unless absolutely necessary, do not use saw blades on an angle grinder, only grinders for metal and stone. Money spent on a circular (circular) or chain saw is not comparable to the loss of your limbs.

    And one more simple trick, spied on by the Moldovan brothers. tape the key from the nut to the power cord of the tool with electrical tape around the base, so you will not lose it anywhere and never forget at home.

    How to change a disk if it is jammed?

    What to do if the wheel on the “angle grinder” is stuck? This can happen, for example, when, as a result of work, pieces of the workpiece being cut sharply clamp the rotating disc. This often leads to its destruction.

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

    • One of these methods would be to use two gas keys at once. In this case, the remains of the disc must be broken with pliers. With one key, you need to clamp the part of the stem located under the disc, and with the other, unscrew the flange.
    • Sometimes, to gain access to the gas wrench to the rod “angle grinder”, you have to disassemble the gearbox.
    • A simple device saves from the problem of a jammed nut. cardboard or tin washers. They are often sold with an “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.

    In extreme cases, the flange can be sawn with a hacksaw for metal and then replaced with a new one.

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    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?
    • Advice

    The disc “angle grinder” (angle grinder) is one of its main working parts. It is the disc that determines the use 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 milling cutters and circular saws. for woodworking, with diamond dusting. for stone and tiles, all kinds of brushes, brushes and emery wheels. for polishing various surfaces.

    The disc “angle grinder” is a consumable material, you cannot save on it in the process of work. The disc will gradually wear out (burn out) and must be replaced. When planning work, you need to be prepared for this and it is better to stock up on several removable disks in advance.

    How to remove it?

    Discs, especially those designed for cutting, burn out quickly and must be replaced.

    It will be useful to remind once again about the need to disconnect the “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 pins are 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 of the gearbox, thus fixing it. Having pressed the button with your right hand, at the same time with your left hand you need to unscrew the fastening nut with a wrench. If the nut has moved from its place, unscrew it by hand. That’s it, now the disc can be removed.
    • There are times when the key, for some reason, was not at hand. What to do? The easiest way out is to stop working. But, as they say, this is not our method. It is also possible to unscrew the clamping nut of the “angle grinder” without a key. 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” with a button, move it from its place. Then it can be unscrewed by hand.
    • The nut has holes for fixing it with pins on the horns of the key, you can unscrew it by tapping with a hammer on a chisel or a bar that is pressed into the hole.
    • It is sometimes possible to push the nut off 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, for example, a hammer or other nail, into the arc formed by a bent nail.

    How to install correctly?

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

    First of all, you need to install the disc in the correct direction. This is especially important if it is detachable. Usually 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.

    On the side on which the label is glued, a wide pressure washer is placed, 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 become 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 breaks down (jamming).

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

    With circular saws or other products that have teeth or a significant difference in two sides, there is usually no problem how to set. For example, a grinding disc cannot be fixed 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 taking into account where the rod will rotate.

    It is also important to consider the size of the disk when installing. In no case should you neglect safety and remove the protective cover. it is better to choose a disc of the appropriate diameter. Sometimes a worn-out disc from a large unit is placed on a smaller “angle grinder”. However, a worn disc, as a rule, cuts worse, the working surface is limited to about half the radius of the disc, the structure is slightly different. The disc burns faster and does less work. This operation can be justified if the diameter of the stem is the same. But you won’t be able to change it back.

    Debris must not get under the disk when installing. Of course, the clamping nut may well squeeze small objects, something will press into the surface of the circle. But an imperceptible skew will cause a displacement of the plane of rotation and, as a result, a strong vibration of the entire mechanism, it can cause the destruction of the disc and, of course, you should not hope for an accurate cut in this case.

    Before installing the disc, the “angle grinder” must be disconnected from the mains. this is a basic safety requirement, since a sudden turn on at this time is fraught with serious injuries.

    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 released stem, with the front side out, and you need to make sure that it is installed exactly in the seat.

    The kit for the new “angle grinder” always includes a certain amount of cardboard spacers. when installing the disc, they must be laid so that they are between the disc and the clamping elements. These gaskets will help unscrew a broken or jammed disc.

    Further, the nut is manually tightened up to the stop and tightened with a special wrench. That’s it, the “angle grinder” is ready to work.


    If you had to use a gas wrench, you must remember about the very powerful shoulder of such a wrench and about the force that is applied to the “angle grinder” parts. 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 carried out with the power supply completely disconnected (the plug must be removed from the socket). Any inadvertent pressing of the start button will cause the electric motor to turn on, and the rod rotation speed is very high. In this case, injuries cannot be avoided.

    Working with an “angle grinder” involves a lot 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 the event of its jamming and destruction.

    Glasses are needed not only as a safety element. If the eyes are protected, more attention can be paid directly to the work of the “angle grinder“, to ensure the correct cut or the choice of the correct mode of operation. This will allow the most efficient use of consumables (cutting wheels), minimizes the occurrence of abnormal situations with a biting disc or its destruction.

    A protective mask that completely covers the face will perfectly replace glasses. this is especially important for a visually impaired master who wears diopter glasses, on which safety glasses cannot be worn.

    The disc on the “angle grinder” can be installed both “away from you” and “towards you”, depending on the direction of rotation and, accordingly, the flow of chips. This does not make a fundamental difference in work. However, the “angle grinder” with a circle “towards itself” when biting the disc tends to jump out of the cut forward, and not on the one who uses it. This is especially important when working with powerful tools, but even a small angle grinder can be 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” is a rough tool and it is not worth striving to obtain an ideal surface as a result of its work, 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, it is better not to cut long metal workpieces 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 press them with a clamp to a workbench or other reliable horizontal surface. The quality of the cut and safety depend on the density of pressing.

    How to put the disc on the “angle grinder” can be seen in the following video.

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    What to use to install the disc?

    In fact, the process of installing a disc into an angle grinder is not that difficult. However, in order to do such work, it is necessary to take into account certain rules and use certain tools.

    • The key with which the nut is loosened.
    • Next, you need the disk itself.
    • A hole or chisel may be needed. These tools must be used in the case when the disc is jammed and it will have to be removed by opening, which means that the residues in the gap can be eliminated with a chisel. You may not need these tools, but keep them close at hand.

    How to Install the Cut-off Wheel on an Angle Grinder Correctly

    Most builders know for sure that they cannot do without using a grinder in their work. At the same time, the popularity of the tool is so great that among the people it received a rather simple name. an angle grinder.

    It is used quite widely, for example, for processing stone, concrete, marble and even reinforced concrete. In some cases, an angle grinder is also used to cut materials that are completely unsuitable for it. However, it should be understood that in this case, many questions also arise regarding safety and the installation of accessories.

    In order to use an angle grinder, you need to know certain nuances of use, so often beginners have a large number of questions.

    One of the many questions is the study of information on how to properly install the disc on an angle grinder, namely which side to put the disc on.

    Which side is suitable for installation

    In order to determine which side to install the disc, several main factors must be taken into account.

    In particular:

    • You can pay attention to the label.If the angle grinder works from itself, namely, turns away from the operator, then in this case the disc must be installed with the label inward. It turns in the opposite direction, which means that the label must be installed outward.
    • Can be placed without paying attention to the label. But then you can expect the most unpredictable results, for example, the usual breakage of the disc and the angle grinder. At the same time, experts say that such negligence can lead to the fact that the angle grinder will simply jam and there is no need to talk about safety in this case.

    Angle Grinder Safety Chapter 2: Mounting Wheels

    In order to determine which direction the angle grinder should turn, refer to the safety information here. In particular, the concrete must be cut on itself.

    In this case, sparks will fly from the side, namely from the manager. In general, it is not safe to cut materials in the direction away from you, since in case of jamming, an angle grinder with a disc will fly exactly at the one who controls it. This must be taken into account.

    I think the author is most likely interested in the question, “which side to put the disc on the angle grinder (angle grinder)?” which interests many.

    As for the algorithm for replacing the disk, questions rarely arise, here everything is called in plain sight. a special key or a gas key and off you go. It is also difficult to miss the size of the disc, here the size of the casing is just the criterion. An important parameter is the number of revolutions indicated on the disc, here you need to choose an angle grinder strictly in accordance with the manual, the disc of which revolutions can be used on it (the revolutions indicated on the disc must be either equal to or greater than the spindle revolutions, but in no case not less!)

    I will not speak about bowl-shaped discs. you cannot put them in another way. Diamond discs and discs for cutting stone from carbide, have an indicator of the direction of rotation, or a pronounced profile of the tooth, in addition, they have a metal base. and it is metal on both sides.

    But in which direction to put the label of the cutting disc during installation, not everyone knows. outward or to the gearbox with a piece of paper.

    Some are simply convinced that there is no difference. But this is not the case. The disc is always placed with the label facing out. Yes, someone will say that the direction of rotation of the disc is not regulated by a strictly drawn arrow, almost always this arrow is not present, at least on abrasive discs (cutting) and will also be right.

    Here the point is different, the arrow is not needed, at least according to several of the following logical conclusions.

    A wide metal washer is installed on the side of the label. This is exactly what should be facing the movable flange nut, that is, outward (even if the disc is without a label). If the disc is jammed and broken, it will be easier to unscrew the movable nut if it slides over the metal washer. If you put the disc on the contrary (with the washer to the gearbox), then the movable outer nut will be very difficult to unscrew along the abrasive part.

    In connection with this seemingly obvious thing, the structure of some cutting discs is performed. They are less susceptible to breakage (and wear), if installed correctly. with the label outward (respectively, and with a wide washer to the clamped nut and not towards the gearbox)

    I have been using an angle grinder in my dacha for several years, and all this time I have no answer to two questions: which side to put the cutting wheel, and in which direction it should rotate. “I shoveled all over the Internet,” but I could not find an unambiguous answer to these questions. The opinions were divided equally. Both sides provide convincing arguments, but at least some authoritative official documents on this topic are silent. Manufacturers are also silent. Today I want to speculate a little on this topic in order to still decide, for a start, with the first question.

    So which side to put the cut-off wheel on the angle grinder?

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

    According to manufacturers, this ring is made to protect the shaft that rotates the grinding wheel. “With a high degree of probability,” this is its main function, otherwise the abrasive, when the disc is rotating, will wipe the groove on the shaft of the angle grinder over time, and it will be impossible to center it. Note that in the production of circles, the ring is riveted during the pressing of the disc from above, after the whole cake of mesh and abrasive has been formed. So, it does not carry any technological function, as it slipped somewhere in the comments from an “authoritative” source. I looked at a number of different rollers for the production of wheels, and everywhere the technological process was approximately the same. the ring was pressed into the disk from above already during the compression of the formed disk by the press.

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

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

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

    So what do we have.

  • Rings on circles, including cup rings, are molded from different sides, although more often they are on the convex side from the side of the label.
  • The circles do not indicate the direction of rotation.
  • These points tell us that “with a high degree of probability” circles can be placed by either side.

    Next, I carefully looked at the washer and nut, between which the disc is attached to the shaft of the angle grinder:

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

    I tried this and that, and so, insert the disc between the washer and the nut, and twist the parts with my hands in order to understand in which case which part clings to the disc better. So, a washer with ribs and an elastic band in any case clings to the disc better, even by the ring, but the nut slides even on the abrasive. I also noticed that it is easier to put the circle on the washer with a ring, since there are burrs on the side of the abrasive that prevent the hole from being loosely put on the neck of the washer. So the results of these experiments clearly support the ring-down setting of the circle on the puck. That is, label down.

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    I noticed one more nuance. The pressing surface of the quick-clamping nut has a significant backlash relative to its thread, which allows it to press the wheels, even if there are abrasive irregularities on their surface. In this case, such a disk will be pressed flat. If you turn it over, then it will lie on the washer with an abrasive at a certain angle, and it will have a lateral runout. This is another argument in favor of setting the circle with the ring down, towards the washer.

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

    Not all angle grinders have a quick-locking nut like mine. If this is a simple nut with wrench holes, then it is easier to tighten it not with a wrench, but with the circle itself. It will be easier if the abrasive clings to this nut. That is, in this case, the circle should also be installed with the ring to the washer. They also say that if the nut adheres to the metal ring, and when biting the circle it clamps it, then it becomes much more difficult to unscrew it than if it adhered to an abrasive that is crumbling by nature.

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

    el_pir sent me a manual for the Metabo WP 850 angle grinder, which says in black and white:

    At the same time, there is no clarification whether this refers to cup circles, or flat. Just detachable. Therefore, to all cut-off. This fully confirms my point of view. Also in all instructions for the Metabo angle grinder you will find the corresponding illustrations. (although only cup circles are shown there):

    Well, the main picture on the covers of all the instructions for the Metabo angle grinder is also a hint. (although the circles there are also cup): Metabo deserves every respect for the quality of its tools, and I think that what is stated in their instructions can be trusted (in case of coincidence of the Russian translation with the English and German ones, of course, because there are still translation errors, see the end of clause 6). So I consider this question closed for myself.

    Which side to put the disc on the angle grinder

    In most cases, the angle grinder abrasive is installed in only one direction, but in a situation when working with stone or concrete, the process changes. Therefore, you need to consider these cases separately.

    Place the disc differently depending on the situation.

    The main difference between the two sides of a circle

    On any angle grinder disc, you can easily notice differences in the two sides of the wheel. One side is plain, it is covered with abrasive materials (for working with different types of metals). The front side has a special label on which they write information about the characteristics of the cutter.

    But the main difference between the two sides of the circle 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.

    Prescribing instructions

    On some models of angle grinder, for example Metabo, it is specified that the metal flange of the abrasive must be adjacent to the supported flange of the angle grinder. It is not for nothing that manufacturers recommend installing the disc in this way, since they rely on safety when working with the tool.

    Important! Improper installation is life-threatening.

    Guaranteed even installation on the shaft

    A metal ring mounted on the disc increases the bearing area, so the tightening pressure becomes even. Thus, the disc will sit as smoothly as possible on the desired surface. The possibility of skewing will be excluded. This directly affects not only the evenness of the cut, but also the safety of the user. the abrasive will not fly into pieces if it does not cling to the angle grinder.

    Why do you need a metal ring

    A washer or simply a metal ring is necessary to protect the abrasive from excessive tightening, since many users tend to tighten the stopper tighter, fearing that the circle will fly off while working with the tool.

    Also, the ring is mounted on an angle grinder disc to significantly increase the bearing surface area. In addition, the washer is designed so that the abrasive does not “stick” to the nut, which simplifies the removal process.

    Ring on disk

    Advantages of ring mounting disc to angle grinder

    There is no exact direction to follow when setting the wheel to the sander. But, as already described above, if you put the cutter “face” out, then the removal process will be simplified, since it is more difficult to catch on the surface from the abrasive side.

    In addition, there are a few more benefits that will be useful to know about.

    For metal

    How to properly place a wheel on an angle grinder is influenced by two factors:

    • Any abrasive has a special label that shows the side to which it needs to be attached to the angle grinder. If the angle grinder is running away from the operator, as it should be in most cases, then the disc must be installed with the label inward. When the angle grinder runs in the opposite direction, the label is on the outside.
    • Of course, you can put the abrasive on either side without paying attention to the label. But in this case, you need to expect unpredictable results, for example, disk breakage.

    Important! Experts assure that if you do not follow the requirements for installing the disc, then the angle grinder will jam one day, the disc can fly apart, damaging the operator working with the tool.

    So how should you install the disc on an angle grinder: pattern outward or inward?

    At first glance, there is not any fundamental difference in which direction the drawing should look at the angle grinder, put it either outward or inward. But if you take a closer look at the instrument, the difference becomes noticeable, and quite significant.

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    How To Convert An Angle Grinder for Cut Off Wheels

    In this post, we will be discussing metal cutting or grinding discs. By the way, at the end of the publication there will be a very interesting video related to discs from an angle grinder, which may be useful to you.

    And so, it would seem that if both the pattern inward and the pattern outward are equally successful in grinding and cutting, then what the hell is the difference in how to install it. But let’s take a closer look at the disk, I hasten to give you a close-up of the outer side of the disk:

    Well, the inner side of the same disk, again large:

    cutting disc safety basics-How to properly use an angle grinder with cutting disc

    Did you notice the difference? That’s right, on one side of the disc for an angle grinder there is a metal ring.

    On my angle grinder, the side pressed against the disc is smooth, but quite often you can find models of an angle grinder on which the washer has a reflection on one of the sides.

    Let’s think about why the manufacturer made an extra body movement and applied the corrugation to the washer. Maybe just so that when installing the metal ring of the disc on the corrugation, the nut presses the disc with the ring to the corrugated washer and then the disc will definitely not slip during operation.

    But you will say that in this case the manufacturer would simply have applied the drawing from the other side. No, and now I will try to explain why.

    There are discs with a “boat”. these are very thick discs, where in the place where the nut enters, there is a recess, something like what we will now see in the photo below:

    So, this disk can only be installed with a pattern inward, even with a strong desire to install it with a pattern outward, it will not work.

    As you can see, this disc was conceived by the manufacturer with the drawing inward and not otherwise. And why? During the same sanding process, the outer side of the disc will be erased and the markings will be erased accordingly. And by marking mo we can learn a lot of interesting things about the disc, for example, what materials it is intended for or what maximum revolutions a given disc can withstand.

    Suppose we worked with a disk, grinded it down to the middle, then replaced it with another, and then we need to reinstall the desired one from the heap of used disks. If you worked with the pattern outward, then the marking has simply been erased, and it is already difficult to establish what this disc is for, for soft metals or for steel. And in the case of a drawing inside, the marking will not suffer.

    By the way, I have always installed the disc on an angle grinder with the pattern outward, but from today.

    Well, and the video that I promised at the beginning of the publication (do not forget to subscribe to my YouTube channel):