How to dress correctly a disk on an angle grinder

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I have been using an angle grinder for several years, and all this time I have not had an answer to two questions: which side to put the cutting wheel on, and in which direction it should rotate. “I searched the whole Internet, but did not find a definite answer to these questions. Opinions are equally divided. Both sides give convincing arguments but any authoritative official documents are silent on the subject. Producers are also silent. Today I want to reflect on this subject with the purpose to define, all the same, with the first question.

So, what side to put a cutting wheel on the angle grinder?

The essence of the question. In the center of the wheel (cutting or grinding) is a ring of galvanized steel, which has four punched holes around the circumference, usually with indented edges, to prevent the rotation of the ring relative to the abrasive. The inner edge of the ring wraps inside the wheel, into its center hole, and ends flush with the opposite surface of the wheel, not protruding into it.

As the manufacturers say, this ring is made to protect the shaft that rotates the grinding wheel. “In all likelihood”, this is its primary function, otherwise the abrasive will eventually rub through the groove on the angle grinder shaft when the disc is cranked, and it will be impossible to center it. Note that in the manufacture of wheels, the ring is riveted on top when the disk is pressed, after the entire pie of mesh and abrasive is formed. So, it does not have any technological function, as it was leaked somewhere in the Комментарии и мнения владельцев from an “authoritative” source. I have watched a number of different videos on wheel production, and everywhere the process was about the same. the ring was pressed into the disc from above while the formed disc was being compressed by the press.

The ring is usually on the label side of the wheel. However, there are circles where the ring comes out on both sides of the circle, and on some circles with a recessed center, it is only on the side opposite the label and is on the recessed side. So, manufacturers mold the rings differently. Although, I must admit, most cup circles have rings on the convex side, which “kind of hints” that it is preferable to put discs with the ring down.

In the beginning, after buying an angle grinder, I intuitively set the wheel with the label facing outward. On that wheel, the metal ring in the center was also pressed on the picture side. I sawed that way and had no problem. But then I got a cup shape circle (with a recessed center) and the picture and the ring were on the convex side. I put it with the picture facing out, and it turns out that the wheel is scraping on the protective casing. I had to turn it upside down. 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 about this issue, and I decided to find out for myself how to set the circle correctly after all? As I mentioned above, the opinions on the Internet on this issue are divided evenly. Then I began to work out my own point of view.

  • Rings on circles, including cup circles, are molded on different sides, although more often they are on the convex side of the label.
  • The direction of rotation is not indicated on the circles.

dress, disk, angle, grinder

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

The washer on the left, which is put on the shaft. It has a ribbed surface and a rubber ring at the inner edge. The nut on the right, although not polished, has a fairly smooth surface, which in the photo lies up. The wheel must be clamped between them. At first I thought that the ribbed surface of the washer was as if designed to grip the abrasive and the smooth nut should slide well over the ring so that you can easily tighten it. But a little embarrassed by the rubber ring, which was clearly made to cling to a smooth surface, and would surely deteriorate if it often had to be pressed against the sharp with burrs edge of the hole on the side of the abrasive.

I’ve tried it both ways, inserting the disk between the washer and the nut and turning the parts by hand to see which part better clings to the disk. So, a washer with ribs and a rubber band clings better to a disk in any case, even to a ring, but a nut slides even on an abrasive. I also noticed that it is easier to put a wheel on a washer with a ring as there are burrs on the abrasive side that prevent free putting the hole on the washer’s neck. So, the results of these experiments are clearly in favor of placing the disk with the ring down on the washer. That is, with the label facing down.

Another thing I noticed. The clamping surface of the quick-clamp nut has a significant play in relation to its threads, allowing it to clamp the wheels even if there are some irregularities on their surface with the abrasive. In this case, such a disk will be pressed flat. If you turn it upside down, it will lie on the washer with abrasive at a certain angle, and it has a transverse run-out. This is another argument in favor of mounting the wheel with the ring down to the washer.

Everything I listed above stems only from the design features. Now a few words about practical convenience.

Not all angle grinders have a quick clamping nut like mine. If it is a simple nut with holes for a wrench, it is easier to tighten it with the wheel itself, not with a wrench. It will be easier if the abrasive clings to this nut. So, in this case, too, you should install the wheel with the ring against the washer. They also say that if the nut is adjacent to a metal ring, and the wheel jams it, it becomes much harder to unscrew than if it is adjacent to an inherently crumbly abrasive.

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In general, after much deliberation, I came to the conclusion that the flat circle should be placed with the ring down to the washer, and if the disk cup, then you can put it in only one position, no matter what side it will have a ring.

What will be needed to install the disk?

Installing the disc on the angle grinder is usually a fairly simple process in which you need to follow a few rules. In order to perform it, it is necessary to equip 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 disc angle grinder or its primary installation. If it happens that the disc is jammed in the angle grinder, to remove it will have to crush and remove the remains from the gap between the supporting flange and the nut with a flat screwdriver or chisel.

Which side to put the cutting disc may depend on several factors. First, if the disc is not flat, there is only one way to put it, and the question disappears by itself. Secondly, if the wheel is still flat, you can be guided by the label. if the angle grinder is turned from itself, it is set with the label inside, if on itself, then, respectively, outward. If this principle is not followed, you can expect undesirable results. disk breakage during sawing or simply its rapid wear and tear.

As for which way the disc on the angle grinder rotates, it is primarily a matter of safety. It is generally assumed that concrete should be cut in the direction of the blade rotation or towards yourself. Ideally, the sparks should fly to the side to the left of the person operating the tool. If this is not possible, an alternative position with the shear of sparks pointing downwards can be used. In any case, you can not allow a situation where sparks fly away from the user, because in the case of a sharp jamming of the disc, the angle grinder will be directed in its direction.

In other words, it is extremely unsafe to cut materials against the direction of disc rotation or away from yourself, because in the case of a wedge, there is a sharp ejection of the angle grinder in the direction of the person working. By the way, if you have any further questions on how to mount the disc on the angle grinder you can also watch the training videos, which are more than enough on the Internet today.

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

Which side is suitable for insertion

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

  • You can pay attention to the label.If the angle grinder works on its own, namely rotating away from the driver, in which case the disc must be installed with the label inside. In the opposite direction it rotates, so the label should be placed outward.
  • You can put it in without looking at the label. But then you can expect the most unpredictable results, such as the usual failure of the disc and angle grinder. 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. The concrete, in particular, must cut against itself.

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

How to use a Cutting Disc with an Angle Grinder

I think the author is most likely interested in the question “what side to put the disk on the angle grinder (angle grinder)?” which many people are interested in.

As for the action algorithm for disk changing, questions rarely arise, everything is in sight. use special key or gas wrench and go. With the size of the disk is also difficult to miss, here the criterion is the size of the casing. Not unimportant parameter is the number of revolutions specified on the drive, here you need to choose in strict accordance with the manual angle grinder, disk what speed can be operated on it (speed specified on the disk should be either equal or greater than the spindle speed, but in no case less than!)

I will not speak on cup-shaped disks. you cannot put them in any other way. Diamond discs and discs for cutting hard alloy stone, have an indication of the direction of rotation, or pronounced tooth profile, in addition, they have a metal base. and it is metal on both sides.

But not everyone knows in which direction to put the label of the cutting disk when installing it. outward or towards the gearbox.

Some people are just convinced that there is no difference. But it doesn’t. The disc is always placed with the label facing outwards. Yes, someone will say that the direction of disc rotation is not strictly regulated by the drawn arrow, this arrow is almost always absent, at least on the abrasive discs (cut-off) and also be right.

Here the matter is different, and the arrow is not necessary, at least for some of the following logical conclusions.

There is a wide metal washer on the side of the label. That’s exactly what it should be facing the moving flange nut, i.e. outwards (even if the disc is unlabeled). In the event of a disc jamming and breakage, the sliding nut will be easier to unscrew if it slides on a metal washer. If you put the disc the other way around (with the washer facing the gearbox) it will be very difficult to unscrew the moving outer nut on the abrasive part.

In connection with this seemingly obvious thing, the structure of some cutting discs is done. They are less subject to cracking (and wear) if they are installed correctly. with the label facing outward (respectively, and a wide washer to the nut to be clamped and not to the gearbox side)

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I have been using an angle grinder in a cottage industry for several years, and during that time I have not got an answer to two questions: which side to put a cutting wheel, and in what direction it should rotate. “I searched all over the Internet, but could not find any unambiguous answer to these questions. Opinions are equally divided. Both sides give convincing arguments, but any authoritative official documents on the subject are silent. Producers are also silent. Today I want to speculate a little on this subject with the purpose to define, to begin with, the first question.

So, which side should I put the cutting wheel on the angle grinder?

Bottom line. In the center of the wheel (either cutting or grinding) is a ring of galvanized steel, which has four punched holes around the circumference, usually with indented edges, to prevent the rotation of the ring relative to the abrasive. The inner edge of the ring wraps inside the wheel, in its center hole, and ends flush with the opposite surface of the wheel, without going over it.

As the manufacturers say, this ring is made to protect the shaft that rotates the grinding wheel. “In all likelihood”, this is its primary function, otherwise the abrasive will eventually rub through the groove on the angle grinder‘s shaft when you spin the disc, and it will be impossible to center it. Note that in the manufacture of circles, the ring is riveted during the pressing of the disk on top, after the entire pie of mesh and abrasive is formed. So, it does not have any technological function, as it was leaked somewhere in the Комментарии и мнения владельцев from an “authoritative” source. I watched a few different commercials for making circles and the process was about the same everywhere. the ring was pressed into the disk from above while the formed disk was being compressed by the press.

The ring is usually on the label side of the circle. However, there are circles in which the ring goes on 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. So, the manufacturers mold the rings differently. Although, I must admit, most cup circles do have the ring on the convex side, which “kind of hints” that it is still preferable to put the discs with the ring down.

In the very beginning, after buying an angle grinder, I intuitively put the wheel with the label facing outward. On that circle, the metal ring in the center was also pressed on the picture side. I saw it that way and had no problem. But then I got a cup shape circle (with a recessed center) and it had the picture and the ring on the convex side. I put it with the picture facing out, and it turned out that the disc was scraping against the guard. I had to turn the wheel upside down. That’s when I had this question for the first time.

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

Putting it to the test

For safety, a helmet with a clear face shield and gloves must be worn.

At first we try to remove thin dry branches, gradually moving on to larger ones, and finish testing by sawing off dry and semi-dry tree trunks 7-8 cm in diameter.

We made sure that the diamond disc grass trimmer works quite effectively, reliably and safely. The cuts, both crosswise and oblique, are very smooth. They do not show any crumpled or torn wood fibers.

Mowing grass with the diamond disc is also quite comfortable, efficient and productive, regardless of its height, density and degree of dryness. So, a grass trimmer with a circular saw blade not only perfectly performs its direct function (mowing the grass), but also expands the field of application (removing knots and branches from trees, and sawing thick trunks).Attention! You should not be keen on installing discs of large diameter and thickness on the grass trimmer, as this will cause an increased load on the gearbox and engine, and possible premature breakdown. It will also reduce the safety of working with such a tool, which should not be allowed under any circumstances.

The main difference between the two sides of the disk

Two surfaces are clearly distinguishable on any cutting disc. One of them (back) is single-colored, formed by the abrasive material. The second (front) side has a label with basic information about the characteristics of the disk. But the main difference between the two surfaces, is the presence on the front side of the metal ring.

The metal washer (ring) is designed to protect the integrity of the disc when it is tightened by the moving flange nut, as well as to increase the area of the bearing surface. In addition, the metal washer prevents the cutting wheel from “sticking” to the surface of the nut, which makes it much easier to replace it.

Unusual disk for “angle grinder” on the size 100/115

Came across (in the mailing) curious disc for angle grinder, I bought it to see what it is 🙂 Why need it, I will not even say. I was just curious what they can do, bought the unusual appearance 🙂 In addition, when I bought it, it cost almost two times cheaper. quite a good price for an experiment and report here 😉

By the way, pay attention to the picture in the header. looked at it long, long. nothing confusing? :)))) I did not notice it at once, so I had trouble photographing it as well. I must try it 😉

Brain explosion.

Took quite a long time and without tracking. Got this blister. I noticed the chain sticking out wrong at once, I thought it was defective and I’d have to “fight” with the store. At the top of the blister are examples of the use of this “gimmick” to the angle grinder, what have the Chinese thought of using it for 😉

As I understand it, for the most part, to make sculptures out of wood, ice, rubber and other soft materials. On the package there is an indication of the maximum rotation speed of 10000-13000, on the disk itself. 14000 🙂

The back side of the blister, with a warning that work with this disc “Danger to life” 🙂

Unpacked the disk, with some unpleasant premonition. the appearance was somehow “not so”.

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It turned out to be a mistake. The device was demountable 🙂 It consists of three parts: two plates and a short chain. They are not fixed between themselves in any way, they are held by clamping with a nut of an angle grinder. The blue part is an “extra” part ;), it was used to connect all parts into one piece during transportation.

Dimensions declared by the store The plate chain is sharp in principle, but the sharpening is kind of crooked. If you want you can sharpen it yourself, it is of course not unimportant.

It’s pretty easy to put everything together. On the bottom plate spread chain (plates, by the way, identical) On top lay the second plate, adjusting the chain, that it would be evenly distributed in a circle. It is worth noting that the inner bore of the plates is smaller than the standard one used on the cutting discs. Therefore, the bottom washer rests on the centering lap on the bottom washer “as it happens” Centering takes place with the inverted nut tightening the disk. The sandwich is not completely tightened, because the thickness of the sandwich.к. The thickness of the sandwich is considerable. It may make sense to increase the size on the bottom washer to “standard” on your own The depth of cut depends on the design of your angle grinder, I suppose there may be a difference on different “grinders” To work with the obtained device I strongly recommend putting on whatever is protection. Revolutions of the angle grinder is very decent, and if the chain will break (caught on a nail), the consequences do not puzzle. I would have worn a helmet if I had one on hand before I turned it on for the first time :)))) You have to tighten the nut well, otherwise, if the chain is loose, when you stop/re-start it can be displaced from the plates by centrifugal force. I did that the very first time, when tightening probably did not quite correctly (evenly) laid the chain in a circle. When properly laid, the top plate fails by a couple of mm and holds the chain pretty tight. In principle, nothing bad happened, but the feeling was still unpleasant 🙂

In the process of testing, I got bolder and did all the work on the weight. it’s actually quite comfortable to work.

And the results of testing. what I could think of “on the fly”. Since I’m not “ever” a sculptor at all, I limited myself to a few different cuts.

Simple sawing goes “like clockwork”.

it is possible to make a groove for a spike or a through hole

cutting depth

it is possible to make a sampling, but it turns out not too convenient and productive

If you make the side kerf for tenoning, it is possible to connect the boards with tenons in the manner of floorboards or battens

And another “domestic” use. making stakes from vampires (aspen was not handy 🙂 If seriously, the sawing of not very thick twigs and branches, after pruning the trees is quite comfortable. I use similar “wood” from peaches and other fruit trees in the barbecue.

Probably very handy device for all sorts of wood and ice sculptors, thanks to small weight of the tool. As an option in the manufacture of wooden bathtubs ( the tale of the goldfish) 🙂 For domestic use had to be exactly make up uses. Yes, you can cut branches. It is probably possible to spike boards, but for this you need to rigidly mount the angle grinder to get relatively even. I did everything in the examples by weight. Somewhat intimidating to look at. thinking about the possible consequences of a chain breaking or a nut unscrewing. However, while working relaxed and not really thought about it, the work is quite comfortable. So you can draw your own conclusions! Can not recommend for purchase, I can not see a particularly interesting application, and injury hazard comes to mind immediately!

At the time of publication there is no availability at BAnguda, but there are options at Ali. for example this link (cheaper is not found)

How the cutting process works?

For a good cut it is necessary that the edges of the blade rotate at a proper speed. It will not cut well if the speed is too low. All disks are designed for certain speeds, if they are exceeded, then there is a danger, which is increased vibration. The grinding wheel can fly apart.

The RPM of the grinders with different diameters is also different. Smaller diameter lathes will rotate at higher speeds.

Please refer to the table for the rotation speed depending on wheel diameter

item no Disc diameter RPM
1 Smaller diameter. 115 or 125 mm. 10000-11000
2 Average diameter. 150 or 180 mm. 8500
3 Large diameter. 230 mm. up to 6650

This frequency is not randomly chosen. Laboratory studies show that the linear speed of the edge of the wheel should be less than 80 m/s. Otherwise, the disc could break into pieces and cause serious consequences. The speed of the angle grinder and the disc mounted on it must be watched very carefully.

But since the rotational speeds of 115 and 125 are the same, a smaller 115-diameter disc can be mounted on an angle grinder with a 125 seat diameter. A grinding machine with a 180 mm diameter can be fitted with a 150 mm wheel.

Based on the above, you can not put on a small angle grinder worn circles from a large angle grinder, although the cover will not be removed, but since the rotation frequency of the big wheel is less, and the angle grinder itself is more, then the destruction of the disk.

To sum up, we would like to remind everyone to be responsible about how to protect their health. Be aware of the following when using angle grinders:

  • carefully read the operating instructions;
  • Use only those circles that do not exceed the specified speed on the angle grinder;
  • do not remove the blade guard under any circumstances;
  • do not put larger diameter circles on the angle grinder with smaller diameters;
  • Keep your tool in good working order and do not operate it if it is out of order.

You have your own way, how to cut easily, quickly, qualitatively, and most importantly not injure. Write about this in the Комментарии и мнения владельцев.

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