How to put a cutting wheel on an angle grinder correctly

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I have been using an angle grinder in my country house for years, and during this time I have not got an answer to two questions: which side to put the cutting wheel and in which direction it should rotate. “I searched all over the Internet, but did not find a unambiguous answer to these questions. Opinions are equally divided. Both sides make convincing arguments, but no authoritative official documents are available on the subject. Also the manufacturers are silent. Today I would like to speculate a little on this topic, but first of all I would like to settle on the first question.

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

The essence of the question. In the center of the wheel (for cutting or grinding) there is a ring of galvanized steel, which has four punched holes around the circumference, usually with indented edges, to prevent rotation of the ring relative to the abrasive. The inner edge of the ring is wrapped 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. “Highly likely”, this is its main function, otherwise the abrasive will eventually rub through the groove on the angle grinder shaft when you spin the disk, and it will be impossible to center it. Note that in the production of grinding wheels, the ring is riveted on top of the disk during pressing, 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 number of different videos of wheel making and the process was about the same everywhere. the ring was pressed into the wheel from above while the formed wheel was being compressed by the press.

The ring is usually on the label side of the circle. 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 in different ways. 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 discs with the ring down.

In the beginning, after I bought my angle grinder, I intuitively put the ring with the label facing outward. On that wheel, the metal ring in the center was also pressed on the picture side. I’ve been sawing that way and haven’t had any problems. But then I got 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 wheel was scraping against the guard. I had to turn the circle upside down. That’s when I first had this question.

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

  • Rings on circles, including cups, are molded on different sides, although more often they are on the convex side of the label.
  • There is no indication of the direction of rotation on the discs.
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cutting, disc, angle, grinder, correctly

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

On the left is the washer that 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 circle must be clamped between them. At first I thought the ribbed surface of the washer looked like it was designed to grip the abrasive, while the smooth nut should slide well over the ring so you can tighten it easily. But it was a little embarrassing to have a rubber ring, which was obviously made to cling to a smooth surface, and would probably deteriorate if it often had to be pressed against the sharp with burrs edge of the hole on the abrasive side.

I’ve tried it this way and that, put the disk between the washer and nut and twist the parts by hand to see which part better clings to the disk. So, a washer with ribs and a rubber band clings better anyway, even to the ring, but the nut slides even on the abrasive. I also noticed that it’s easier to put a circle on the washer with the ring, because there are burrs on the abrasive side that prevent the hole from sliding freely onto the neck of the washer. So the results of these experiments clearly show in favor of placing the wheel with the ring down on the washer. That is, with the label facing down.

There’s another thing I noticed. The clamping surface of a quick-clamp nut has a significant backlash relative to its thread, which allows it to clamp the wheels, even if their surface has irregularities in the abrasive. In this case, such a disc would be pressed flat. If you turn it upside down, it will lie with its abrasive on the washer at a certain angle and it will have a transverse run-out. This is another argument in favor of mounting the wheel with the ring down to the washer.

Everything I’ve listed above stems only from the design features. Now a word 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 will cling to this nut. That is, in this case, too, you should set the wheel with the ring to the washer. It is also said that if the nut is adjacent to the metal ring, and when the grinding wheel jams it, then unscrewing it becomes much more difficult than if it adhered to the crumbling nature of the abrasive.

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

How to cut with an angle grinder

When it comes to the angle grinder, many are interested in the origin of such a curious name of this power tool. The fact that the angle grinder to us began to be imported from Bulgaria. And since the tool turned out to be extremely popular and at the same time had no convenient name in our language, it was nicknamed by the country of manufacture.

Despite the popularity of grinders, the average user can not say with complete certainty how to properly put the circles. Some people put their grinding wheels with their picture inside, and some. with their picture outside. There are those who don’t see the difference here at all.

How to mount the disk correctly on an angle grinder

Before you put the disk on the angle grinder need to determine what side it should be located to the tool. This point is particularly relevant when it comes to the cutting wheel. Let’s take a closer look at whether there is a difference between the position of the marking head pointing outward or toward the machine.

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Accessories for angle grinder today presented in a large variety. On some of them the manufacturer indicates the direction of rotation with arrows, so you do not make a mistake, how to properly install the disk on the angle grinder. This includes discs for cutting stone or wood. Also included in the list are many diamond-coated nozzles.

There is a tooling that is easy to identify by its performance. Here, the underside is made in a single plane, and the front side is a working. The most striking sample is considered to be the variants that have an abrasive coating. Grinding in such a case can only be done with one side of the nozzle.

The easiest reference point for proper installation of the disc on the angle grinder is the condition of the surface. The outside part can be marked, labeled, and roughened. The last point is especially important. The fixing nut against the smooth part of the tooling slides, and the abrasive creates the necessary resistance for reliability.

There is one more point of reference. After installing the wheel, you need to pay attention to the tightness of the connection unit. There must be no empty space between the nut and the nozzle to prevent debris from entering the rotating mechanism. Also, hard particles in the gap can cause skewing of the wheel, followed by increased vibration of the power tool. Increased risk of tool breakage, poorer cutting quality, and decreased safety during installation work.

Crimping ring

The crimping ring is an important element and a reference point for determining how to correctly place the disk on the angle grinder, which side. The main purpose of the part is to increase the support area in the clamping nut area. This distributes the load on the bit more evenly and reduces the risk of it breaking during clamping or operation. Additionally, the ring protects the clamping nut from overheating and so-called “boiling over” with the abrasive surface of the wheel.

Often in order to ensure safety, especially novice craftsmen try to tighten the clamping nut as tight as possible. A metal ring then prevents the bit from kinking or breaking. Damage to the abrasive coating is also prevented.

What you need for installing the disc?

Installing a disc on an angle grinder is usually a fairly simple process, in which you need to follow a few rules. In order to make it, you need to arm yourself with the appropriate tool. a wrench, which will be needed to unscrew the nut. The next step after unscrewing it, will be to replace the disc angle grinder or its primary installation. If it happened that the disk is jammed in the angle grinder, you will have to crush it and extract the remains from the gap between the support flange and the nut with a flat screwdriver or chisel to remove it.

Which way you place 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 circle is still flat, you can be guided by the label. if the angle grinder turns from itself, it is installed with the label inside, if on itself, then, respectively, outward. If this principle is not followed, you can expect undesirable results. disk breakage during sawing or simply its rapid wear.

As for which way the disc on the angle grinder rotates, it is primarily a question of safety. It is believed that concrete should be cut in the direction of disc rotation or towards yourself. Ideally, the sparks should fly to the side to the left of the person working with the tool. If this does not work, you can use another position, where the shear of sparks is directed downward. In any case, a situation where sparks fly away from the user should not be allowed, because in the case of a sharp wedging of the disc, the angle grinder will be directed in his direction.

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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 further questions arise as to how to install the disk on the angle grinder, you can also view training videos, which today on the Internet more than enough.

If you still have questions or need advice on changing and installing the discs, it is enough to leave an application on the website or call the contact phone number, and our experts will prompt you how to act correctly. See our diamond discs for our complete range of products.

Warming up

The pressure nut should be heated with a hot air gun or gas torch to make the metal more compliant. Then unscrew it with a box spanner or with your hands. But the risk with this method is that you can damage the plastic parts and gearbox components.

The shoulder when using a gas wrench increases, consequently, the torque of the force also increases. This tool makes it easier to loosen jammed joints. But if you try too hard you risk crushing the flange or breaking the spindle lock.

The main difference between the two sides of the disk

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

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

Sanding discs

Grinding discs are used for polishing concrete, metal and wooden surfaces for painting or priming. Grinding wheel tips can be made of sandpaper, felt or even felt. In turn, grinding wheels by design can be lobed and flat (worn on the wheel).

Every grinding disc has its own grit number. It is selected according to the job to be done. The following table shows the grit selection table for each type of grinding wheel:

Types of grinding Recommended grit number
Flat 16. 36
Circular deburring tool 24. 36
Circular finish 60. 100
Finishing of multi-blade tools 170. 220
Finishing 180. 320
Thread Grinding 100. 280

To sum up, it is necessary to recall that each person must act responsibly in protecting his or her health. Remember the following when using angle grinders:

  • Read the operating instructions carefully;
  • Only use grinding wheels which do not exceed the specified speed on the angle grinder;
  • Never remove the blade guard;
  • Do not put larger diameter wheels on the angle grinder with smaller diameters;
  • Ensure that the tool is in good condition and does not work with defective tools.

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

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