Discs for angle grinder: types and features
Angle grinder (“angle grinder”, or angle grinder) is a multifunctional tool. With it you can cut metal, concrete, brick, tiles, plastic and wood; grind, scrape, polish, remove paint and rust; use as a sharpener. Different tools are needed for different jobs. In order to choose the right tool for a particular type of work, it is necessary to get acquainted with what discs and attachments for the angle grinder there are. The tool for this device is chosen by size and purpose.
cutting disc safety basics-How to properly use an angle grinder with cutting disc
When selecting a disc for your angle grinder, make sure that the outside diameter of the tool does not exceed the maximum allowable values allowed for your angle grinder. For example, if the angle grinder is designed to use the wheel with a maximum diameter of 125 mm, you can not install it on the wheel at 230 mm. And there are several explanations for this:
- the linear speed of the cutting edge will be exceeded, which is fraught with the destruction of the abrasive wheel and injury to the user;
- A small angle grinder does not have enough power to work with a large tool;
- installation nozzle, exceeding the allowable dimensions, requires the removal of the protective cover, and this is a violation of safety rules.
Discs for angle grinder have standard sizes: 115, 125, 150, 180 and 230 mm. In modern angle grinders planting diameter (diameter of the shaft on which the tool is installed) is almost the same and is equal to 22.2 mm. If you “happened to have” an angle grinder of an old model, you will need to use adapters. rings of different diameters. There are two more standard sizes: 280 mm and 400 mm. However, they are seldom used.
All abrasive wheels in all sizes are marked with a code that indicates the following information: blade diameter and thickness, seating diameter, maximum rotation speed and the material to be machined.
Choice of saw blade
The disc includes three rings with the same outside diameter (30 mm) but different inside diameters, i.e. they have different widths. These rings are designed to compensate for the difference between the saw blade seating hole and the counter element on the larger diameter clamping washer.
The advantages of circular grinding wheels for angle grinders
Cutting discs do not have a programmed direction of rotation. That is why it does not matter which way you mount them. But as mentioned above, installing the wheel face outward makes it easier to replace it (it is much harder to unscrew the nut on the abrasive side). In addition, this installation provides several other advantages.
Ensuring smooth mounting on the shaft
The metal ring increases the support area. So when a disc is mounted on a shaft and the nut is tightened, pressure is evenly distributed. It guarantees a straight fit of the cutting wheel and reduces the chance of damage due to misalignment.
Convenient mounting of the blade
Mounting the wheel with the cutting wheel facing outwards has yet another advantage. you can always see exactly which metal or stone cutting head is mounted on the angle grinder at any given moment. They are not interchangeable and a mistake can have serious consequences. For example, if you try to use a metal cutting disc to cut through concrete, it can break and injure the craftsman with its resulting chunks. So mounting the abrasive wheel with the label facing outwards is not only convenient, but also safe to use.
A wrench that can be used to unscrew the nut
The instructions for many angle grinders, such as the Metabo WP 850, clearly state that “the metal flange of the wheels for abrasive cutting must be adjacent to the supporting flange”. Manufacturers do not give such recommendations for nothing, as they ensure safe work with the tool, reducing the risk of serious injury to the master.
What you need to use to install the disc?
In fact, the process of installing a disc in an angle grinder is not that complicated. However, in order to perform such work, it is necessary to take into account certain rules and use certain tools.
Specifically, you may need to:
- A wrench that is used to loosen the nut.
- Next, the disk itself is needed.
- You may need a hole or a chisel. These tools should be used when the disk is jammed and you have to take it out by unscrewing it, which means that you can remove the remains in the gap with a chisel. These tools may not be necessary, but it is better to have them on hand.
What will be needed to install the disk??
Installing the disc on an angle grinder is usually a fairly simple process, in which you need to follow a few rules. To install the nut, 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 the replacement of the disk angle grinder or its initial installation. If it happens that the disc is jammed in the angle grinder, to remove it, you will have to crush it and extract 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 install 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 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 just rapid wear and tear.
As for the direction of rotation of the disc on the angle grinder, this is primarily a safety issue. It is believed that concrete should be cut in the direction of rotation of the disc or towards yourself. Ideally the sparks should fly to the side to the left of the person operating the tool. If this cannot be done, another position can be used where the shear of sparks is directed downwards. In any case, you must not allow a situation where sparks are flying away from the user, because if the disc jams, 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 additional questions about 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 just leave an application online or call us on the listed contact phone number and our experts will tell you the right way. Our entire product range of diamond discs can be found under diamond discs.
Which way to put the disc on the angle grinder
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I have been using an angle grinder in the cottage industry for several years, and all this time I have not had 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 definite answer to these questions. Opinions are equally divided. Both sides make convincing arguments, but no authoritative official documents speak for themselves. The manufacturers are also silent. Today I want to speculate a little on this subject, in order to determine, first of all, the first question.
So, which side to put the cutting wheel on the angle grinder?
The essence of the question. In the center of a cutting or grinding wheel is a ring of galvanized steel, which has four punched holes around its circumference, usually with indented edges, to prevent the rotation of the ring relative to the abrasive. The inner edge of the ring turns inside the wheel, into its central hole, and ends flush with the opposite surface of the wheel, not protruding into it.
As manufacturers say, this ring is made to protect the shaft that rotates the grinding wheel. “In all likelihood”, this is its main function, otherwise the abrasive will eventually rub a groove on the angle grinder shaft when you spin the disc, and it will be impossible to center it. Let me note that in the manufacture of circles the ring is riveted on top during the pressing of the disk, after the entire pie of mesh and abrasive is formed. So, it does not have any technological function, as it was mentioned somewhere in the Комментарии и мнения владельцев of an “authoritative” source. I watched a number of different videos on the production of circles, and everywhere the technological process was about the same. the ring was pressed into the disk from the top already during the compression of the formed disk in the press.
The ring is usually on the label side of the circle. However, there are circles in which the ring comes out on both sides of the circle, and on some circles with a recessed middle, it is located only on the side opposite to the label and is on the recessed side. That is, manufacturers mold the rings differently. Although, admittedly, most cup wheels still have rings on the convex side, which “sort of hints” that it is still preferable to put the discs with the ring down.
In the beginning, after buying an angle grinder, I intuitively put the circle with the label outward. On that wheel, the metal ring in the center was also pressed on the picture side. That’s how I was sawing and had no problems. But then I got a cup shaped circle (with a recessed center), and it had the picture and ring on the convex side. I put it with the picture facing outward and found that the wheel was scraping against the guard. I had to turn the circle upside down. That’s when I had this question for the first time.
The other day, while watching a YouTube video about tools, I came across a discussion about this issue and decided to find out for myself how to make a circle? As I mentioned above, opinions on the Internet were equally divided on this issue. Then I began to develop my own point of view.
- The rings on the circles, including cup circles, are molded on different sides, although they are more often on the convex side on the label side.
- The direction of rotation is not indicated on the wheel.
Next, I looked closely at the washer and nut, between which the disk is attached to the shaft of the angle grinder:
On the left is the washer that goes on the shaft. It has a ribbed surface and a rubber ring at the inner edge. The nut on the right, though not polished, has a fairly smooth surface, which is up in the photo. The circle must be clamped between them. At first I thought that the ribbed surface of the washer was as if designed to catch the abrasive, while the smooth nut should slide well over the ring so that you can tighten it easily. But it was a little disconcerting to see the rubber ring, which was clearly made to cling to a smooth surface, and would surely deteriorate if the sharp, burr-ridden edge of the hole on the abrasive side often had to be pressed against it.
I’ve tried it both ways, putting the disk between the washer and 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 in any case clings to the disk better, even to the ring, but the nut slides even over the abrasive. I also noticed that it is easier to put a wheel on a washer by the ring, because on the abrasive side there are burrs that prevent free putting a hole on the washer neck. So the results of these experiments are clearly in favor of mounting the circle with the ring down on the washer. That is, with the label facing down.
I noticed another nuance. 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 there are irregularities on their surface with abrasive. In this case, such a disk will be pressed flat. If you turn it upside down, it will lie with the abrasive on the washer at a certain angle, and it will have a transverse run-out. This is another argument in favor of putting the wheel with the ring down against the washer.
Everything that I have listed above follows 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 key holes, 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. That is, in this case, too, you should install the circle with the ring to the washer. They say that if the nut is tightened against a metal ring and the wheel jams it, it is much harder to unscrew than if it is against an inherently crumbly abrasive.
In general, after much deliberation, I came to the conclusion that the flat disc should be set with the ring down to the washer, and if the disk cup, then you can put it in one position only, no matter what side it will have a ring.
What’s the difference between the sides of the disc
The first side does not have any labels, markings or pictures. The other side of the disc bears the tool manufacturer’s brand name. You may also see its specifications and a metal crimp ring.
The presence of a crimping ring helps to increase the support area and the crimping nut. This not only distributes the load evenly on the drive, but also ensures the integrity of the drive when tightening the clamping nut. It is also important that the retaining ring protects the clamping nut and the abrasive surface from boiling.
Which type of mounting system to choose?
What kind of nut do you need to mount the disk of an angle grinder? There is no definite answer. It all depends on the specifics of your work and tool model. Experience will tell you which is better. For example, for all the indisputable advantages of superlatives and quick-clamping elements, they have their detractors. They are not recognized by craftsmen who are used to working with a cutting wheel up to the stop. In this case, a nut with a larger diameter than the standard nut does not allow the maximum use of the entire surface of the disc. There can also be problems fixing some lobe stripper wheels. Users who work with diamond discs do not install such a fastener because it is heavier than a standard one. this affects the balance when precision cutting stone.
Many believe that the key and the rotating washer nut are a thing of the past. But this is not the case. Affordable items are less likely to be broken, lost, or given to the crew to work on. And those who want to buy a professional tool for themselves, of course, do not spare money for such a little thing as a quick-clamping nut for fixing the disc of angle grinder. In our catalog you can find the right one by type, price and purpose. come in and choose!