Which side to put the cutting wheel on the grinder

How to put the cut-off wheel on the grinder correctly

which, side, cutting, wheel, grinder

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

It is used quite widely, for example, for processing stone, concrete, marble and even reinforced concrete. In some cases, the 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 a 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 the grinder, namely which side to put the disc on.

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 “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 “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 of the “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 on a “grinder” of smaller dimensions they put a worn-out disc from a large unit. 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 “grinder” must be disconnected from the network. this is the main 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 “grinder” always includes a certain number 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.

Angle Grinder Safety Chapter 2: Mounting Wheels

Further, the nut is manually tightened up to the stop and tightened with a special wrench. Everything, the “Bulgarian” is ready to work.

How to change a disk if it is jammed?

What to do if the circle on the 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 of the “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 a 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.

What to use to install the disc?

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

In particular, the installation may require:

  • 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.

Advice

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

All manipulations with the disc of the angle grinder must be 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 a grinder involves a large amount of waste in the form of metal or wood shavings and dust. Before starting work, you must wear special safety glasses: they will protect your eyes from fragments of the cutting wheel itself in 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 “grinder”, to ensure the correct cut or the choice of the correct operating mode. 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 “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 “grinder” with a circle “on 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 a small angle grinder can pose a serious danger.

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.

“Bulgarian” is a rough processing 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.

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Today, after another dispute. which side to put the disc on the “grinder”. I decided to speak on this topic in writing, even so, in my opinion, this question is quite interesting.
And besides, in the future, rather than once again breeding demagoguery, it is better to just throw a link to this entry.
I work in a workshop (mainly a power tool) and I see that grinders with “jammed” discs are quite often worn. Sometimes it jams so much that you have to disassemble the gearbox and, holding the driven gear in a vice, unscrew the nut with a healthy gas wrench.
It is interesting that the nuts stick only on typewriters with the disk installed on the right, that is, “sparkled” from the typewriter. If we take into account that under NORMAL load the moment on the spindle is small, then such a bad self-tightening should not occur, but it happens, why? Due to shock loads, which are generally common when the disc is installed on the right.
Why this happens is easier to explain with this example (too lazy to draw). we start the motorcycle, and, holding it behind the steering wheel, we try to make the drive (rear) wheel slip. So the most complete analogy with a sharp angle grinder with a disc “away from you” will be if we hold the steering wheel while standing in front of the motorcycle. Try it, you will definitely like it. If you like to cut “from yourself” you will definitely like it.
There is an important caveat. the higher the support and the shorter the base, the more interesting the effect.
And yet, the center of mass of the angle grinder and the hands that hold it is above the cutting plane (more precisely, the force vector), this is what leads to strong jerks, and as a result, often to breakdowns and injuries
In short, it turns out that working with a grinder “from oneself” is something like a dangerous ride with slipping on the verge of “getting up on the goat”.

Now, how will it be if the disk is on the left and “sparks” under the angle grinder:
We take a FRONT-DRIVE motorcycle, start it naturally, turn on the gear and, holding the trunk, admire how wonderfully the front wheel slips. It SLOPES (in the analogy, cuts) and does not “enter” under the fulcrum, increasing grip and trying to raise the steering wheel, as it is with a rear wheel drive.
That is, it turns out that as a system, the “front-wheel drive version” is more stable and predictable, even if we press the steering wheel from above.
Well, something like that. Maybe idiotic, but figuratively.

I somehow cut a rail sticking out from the ceiling a couple of months ago, cut one standing on a stool with a hefty 2.2 kW grinder, besides with the protective casing removed (well, you can’t!).
If only cut “from myself”. I would be killed, nah., and more than once.

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 grinder works from itself, namely, turns away from the manager, 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 breakdown of the disc and grinder. At the same time, experts say that such negligence can lead to the fact that the grinder will simply jam and there is no need to talk about safety in this case.

In order to determine in which direction the grinder should turn, here you need to refer to the safety information. 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, the grinder with the disc will fly towards the one who controls it. This must be taken into account.

The disc of the “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 “grinder” is a consumable material; you will not be able to 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.

What to use to install the disc?

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

In particular, the installation may require:

  • 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 properly install the cutting disc on the grinder

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

It is used quite widely, for example, for processing stone, concrete, marble and even reinforced concrete. In some cases, the 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 a 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 the 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.

How to fit an Angle Grinder blade, label up or label down?

In particular:

  • You can pay attention to the label. If the grinder works on its own, namely turns away from the manager, 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 breakdown of the disc and grinder. At the same time, experts say that such negligence can lead to the fact that the grinder will simply jam and there is no need to talk about safety in this case.

In order to determine in which direction the grinder should turn, here you need to refer to the safety information. 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, the grinder with the disc will fly towards 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 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 strictly in accordance with the manual of the grinder, 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 a 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 cutting wheel on the 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 scrolling, will wipe the groove on the grinder shaft 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.

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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 a 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 disk is attached to the grinder shaft:

    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.

    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 grinders have such a quick-locking nut as 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 instructions for the Metabo WP 850 grinder, in which it is written 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 Metabo grinders, the corresponding figures are given (although only cup circles are shown there):

    Well, the main picture on the covers of all Metabo grinders’ instructions is also kakbe 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.

    The main difference between the two sides of a circle

    On any cutting disc, two surfaces are clearly visible. One of them (back) is plain, formed by abrasive material. The second (front) has a label containing basic information about the characteristics of the disc. But the main distinguishing feature of the two surfaces is the presence of a metal ring on the front side.

    Which side to put the cutting wheel on the grinder

    Angle grinder (angle grinder) or, as it is also called, “grinder” is a widespread tool with which craftsmen saw, cut, grind various surfaces. During work, it is often necessary to replace the working disk. And at this moment, many have a question about which side to put the cutting disc on the grinder.

    The advantages of installing a disc with a ring to a grinder

    The cut-off wheels do not have a programmed direction of rotation. Therefore, it does not matter which side will carry out their installation. But as mentioned above, installing the circle with its front side outward makes it easier to replace it (it is much more difficult to unscrew the nut on the abrasive side). In addition, such an installation provides several more advantages.

    Prescribing instructions

    The instructions for many angle grinders, such as the Metabo WP 850, clearly state that “the metal flange of the abrasive cut-off wheels must be in contact with the support flange”. Manufacturers do not give such recommendations in vain, since they ensure safe operation of the tool, reduce the risk of serious injury to the master.

    Guaranteed even installation on the shaft

    The metal ring increases the footprint. Therefore, when the disc is installed on the shaft and starts to tighten with the nut, the pressure is evenly distributed. This ensures a smooth fit of the cut-off wheel and reduces the likelihood of damage due to skewing.

    Why do you need a metal ring

    The metal washer (ring) is designed to protect the integrity of the disk when it is tightened with a movable flange nut, as well as to increase the bearing surface area. In addition, the metal washer does not allow the cutting disc to “stick” to the nut surface, which greatly facilitates the process of its replacement.

    Ease of disk installation

    Installing the abrasive wheel with the face outward provides another advantage. you will always visually see which nozzle (for metal or stone) is installed at a given moment on the grinder. They are not interchangeable and, if mistaken, there is a high likelihood of serious consequences. For example, when trying to use a cutting disc for metal cutting through concrete, it may be destroyed and traumatized by the resulting pieces of the master. Therefore, installing the abrasive wheel with the label facing out will provide not only convenience, but also safety of work.

    Which side to put the disc on the grinder, what to do if the disc is jammed?

    Most specialists in repair and construction work today are well acquainted with the angle grinder or, as it is popularly called, the grinder. It is used to process a variety of materials, including stone, reinforced concrete, concrete, marble and many others. At first, beginners may have a number of questions, among which the most frequent are: how to properly install the disc on the grinder, how to fix the disc on the grinder, which side to put the disc on the grinder and in which direction the disc should turn on the grinder. Let’s try now to give short answers to all these questions.

    What you need to install the disc?

    Installing a disc on a grinder is usually a fairly simple process in which you must follow several rules. In order to produce it, you need to arm yourself with the appropriate tool. a wrench, which will be needed to unscrew the nut. The next step after it has been untwisted will be the replacement of the grinder disc or its initial installation. If something happens that has clamped the disc in the grinder, to remove it, you will have to crumble it and remove the remnants from the gap between the support flange and the nut using a flat screwdriver or chisel.

    Which side to put the disc on the grinder?

    Which side to put the cutting disc on can depend on several factors. Firstly, if the disk is not flat, then there is only one way to install it and the question disappears by itself. Secondly, if the circle is still flat, you can focus on the label. if the grinder is spinning away from itself, then it is installed with the label inward, if towards itself, then, accordingly, outward. If this principle is not followed, then you can expect undesirable results. breakage of the disc during the sawing process or simply wear it out quickly.

    As for the direction in which the disc rotates on the grinder, this is primarily a safety issue. It is believed that it is necessary to cut concrete in the direction of rotation of the disc or towards oneself. In an ideal position, the sparks should fly to the side to the left of the person operating the tool. If this does not work, then you can use a different position, when the beam of sparks is directed downward. In any case, a situation should not be allowed when sparks fly from the user, since in the event of a sharp jamming of the disc, the grinder will be directed in his direction.

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

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    If you still have questions or need advice on changing and installing disks, just leave a request on the website or call the specified contact phone number, and our specialists will tell you how to proceed correctly. Our entire range of diamond blades is presented in the section diamond blades.

    Which side to put the cutting wheel on the grinder

    I have been using a 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 cutting wheel on the 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 scrolling, will wipe the groove on the grinder shaft 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.

    History of the issue.

    At the very beginning, after buying a 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 disk is attached to the grinder shaft:

    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.

    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 grinders have such a quick-locking nut as 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 instructions for the Metabo WP 850 grinder, in which it is written 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 Metabo grinders, the corresponding figures are given (although only cup circles are shown there):

    Well, the main picture on the covers of all Metabo grinders’ instructions is also kakbe 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 grinder, what to do if the disc is jammed? 08/13/2015 09:47

    Most specialists in repair and construction work today are well acquainted with the angle grinder or, as it is popularly called, the grinder. It is used to process a variety of materials, including stone, reinforced concrete, concrete, marble and many others. At first, beginners may have a number of questions, among which the most frequent are: how to properly install the disc on the grinder, how to fix the disc on the grinder, which side to put the disc on the grinder and in which direction the disc should turn on the grinder. Let’s try now to give short answers to all these questions.

    About diamond tools

    What you need to install the disc?

    Installing a disc on a grinder is usually a fairly simple process in which you must follow several rules. In order to produce it, you need to arm yourself with the appropriate tool. a wrench, which will be needed to unscrew the nut. The next step after it has been untwisted will be the replacement of the grinder disc or its initial installation. If something happens that has clamped the disc in the grinder, to remove it, you will have to crumble it and remove the remnants from the gap between the support flange and the nut using a flat screwdriver or chisel.

    Which side to put the disc on the grinder?

    Which side to put the cutting disc on can depend on several factors. Firstly, if the disk is not flat, then there is only one way to install it and the question disappears by itself. Secondly, if the circle is still flat, you can focus on the label. if the grinder is spinning away from itself, then it is installed with the label inward, if towards itself, then, accordingly, outward. If this principle is not followed, then you can expect undesirable results. breakage of the disc during the sawing process or simply wear it out quickly.

    As for the direction in which the disc rotates on the grinder, this is primarily a safety issue. It is believed that it is necessary to cut concrete in the direction of rotation of the disc or towards oneself. In an ideal position, the sparks should fly to the side to the left of the person operating the tool. If this does not work, then you can use a different position, when the beam of sparks is directed downward. In any case, a situation should not be allowed when sparks fly from the user, since in the event of a sharp jamming of the disc, the grinder will be directed in his direction.

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

    If you still have questions or need advice on changing and installing disks, just leave a request on the website or call the specified contact phone number, and our specialists will tell you how to proceed correctly. Our entire range of diamond blades is presented in the section diamond blades.