If you are a man with hands and you have an angle grinder, consider yourself lucky.
With its help, you can accomplish many things, improve your life, and save a lot of money.
However, for successful work you will need not only the grinder itself, but also the discs for it.
There are different types of discs for grinders - for woodworking, metalworking, for removing rust and many other things.
The official name of the grinder is an angle grinder, or angle grinder.
It is called that because it was originally used to work with hard-to-reach internal large-sized parts in production.
Later they began to use it for other work, mainly cutting metal and stone materials.
Most types of grinder blades are also designed for cutting.
Bulgarians are different. Their disks have different sizes - the smallest is 115 mm in diameter, the largest is 230.
Most often, tools with 230 and 125 mm discs are used. They are easiest to find on sale. There are reasons for this - the smallest discs with a diameter of 115 mm wear out very quickly, they have little working power, and a significant part of the diameter is eaten up by the dimensions of the tool and the mounting hole.
Therefore, where it is necessary to perform precise work, holding the grinder with one hand, use a tool for the 125th disc. And if you need to cut a lot, for a long time, and thick material, you need a powerful tool with high performance. This is exactly what an angle grinder with 230 wheels is like.
All disk sizes:
- 230 mm
- 180 mm
- 150 mm
- 125 mm
- 115 mm
During operation, the disk is ground down and its diameter changes. This can happen until the disk breaks or until its diameter becomes smaller than the diameter of the angle grinder body.
A disk of a smaller diameter can always be placed on a grinder of a larger standard size. This happens because all grinders have the same diameter of the mounting hole - 22.2 mm. And the thread of the stud for fixing is the same - M14.
There are discs with larger diameters. However, they are not intended for grinders. A more powerful tool can be hand-held, but more often it is used for machine tools, concrete cutters, and other machines not intended to be held in.
Large discs have a higher cutting speed and longer service life, but they are more likely to break, which is why they are not intended for hand tools- too dangerous.
There are other manual ones that, in principle, can use types of discs for grinders and grinding surfaces.
These are the so-called grinding machines on concrete.
They can use discs with a diameter of 230 mm. However, their main goal is to work not with the radial surface, that is, with the edge of the circle, but with its plane. The main consumable for them is cup grinding wheels.
Combination discs have grooves along the edges of a curved shape. They remove dust from the cutting area. They can be used for all types of cutting, they are more productive than others, but they have more wear per meter of cut.
Wood discs and safety precautions
You can find many other grinder discs on sale - for example, numerous types of grinder discs, for cleaning concrete seams, for polishing, etc.
The discs themselves are not dangerous for the worker, but they can damage the tool - if the grinder is used with a load not radial, but along the axis of the disc, its bearings fail. Repairs won't be cheap.
There are some other types of discs, the use of which is not harmful for an angle grinder. These are discs with a sandpaper, located radially, and discs with sandpaper petals, also located. However, they can be used if their width is small. In principle, any discs can be used with concrete grinders, but this is no longer an angle grinder.
The video provides an overview of grinder wheels:
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Among construction tools, the grinder stands out for its versatility. Changed the nozzle - and cutting tool turned into a grinder. Can handle any type of work that requires rotational motion. Let's look at the range and purpose of one category of attachments - grinding wheels.
Types of nozzles
Nozzles for grinders differ in shape, thickness, diameter, material of manufacture and are divided into four groups:
- cutting;
- polishing and grinding;
- for sharpening;
- stripping attachments.
The most extensive and widely used group are cutting discs. Most often, consumables for working on wood, stone, metal, and diamond wheels are purchased. The diameter of the tool can be from 115 to 230 mm, thickness 1 - 3.2 mm, the larger the diameter, the thicker the disc. Special abrasives are applied to the cutting surface of the stone tool. It is advisable to use discs for wood and metal together with a device for permanent installation of an angle grinder, otherwise the work may cost several fingers. It is preferable to work with fine-toothed discs.
Diamond cutters cut any materials; they are usually used when laying porcelain tiles, tiles, and reinforced concrete. The edge of a diamond wheel can be torn or solid, and the size of the diamond particles can be larger or smaller.
Grinding and polishing wheels
Grinding perform the following types of work:
- grinding;
- cleaning;
- stripping;
- removing rust;
- polishing
This is the most numerous group of attachments, which can be:
- with replaceable emery wheels;
- with a spongy surface;
- felt;
- fabric.
Most often, to work on such a paste or liquid with small abrasive particles. Primary grinding of metal is carried out on wheels with a low-abrasive surface, finishing - on felt and fabric wheels. The various surfaces of grinding wheels allow you to bring the material being processed to any degree of smoothness, be it metal or wood. They are so convenient that they are used in car repair shops to polish car bodies.
- cup;
- petal;
- fiber;
- brush cord.
Flap attachments are designed for wood processing, for example, peeling off old coating.
Cup wheels are used when working on concrete and stone, less often on metal. A low-power angle grinder will not cope with such a tool and will quickly burn out. Therefore, they are installed only on powerful angle grinders. In addition, the curved shape allows you to get to hard-to-reach areas. Grinding is done more carefully, since the fixing nut does not stick out.
Sharpening discs and roughening attachments
- sharpening abrasive discs;
- twisted cones;
- roughing diamond.
Abrasive grinders are used for sharpening tools and cleaning welding areas. They are quite thick (from 5 mm), there is a recess on the inner surface. An example is fiber discs, which clean welding areas from scale and remove traces of oxidation well. Diamond grinding attachments only work on stone or concrete.
Twisted rollers, also known as metal cord brushes or wire brushes, differ in size, shape, and maximum rotation speed. Most often they are used to remove traces of metal oxidation and brush wood.
Selecting a grinding wheel
When choosing a circle for an angle grinder, the following points are important:
- The diameter of the disk must correspond to the maximum allowable for a particular tool. Otherwise, the consumable may be destroyed due to exceeding the maximum permissible rotation speed. The power of the tool may not be enough to rotate a large circle. Using large diameter it is necessary to remove the protective casing, and this is dangerous to the worker’s health;
- material to be processed: it is advisable to prefer specialized discs to universal ones, for example, for wood;
- maximum permitted linear speed: information about it is printed on the packaging or side surface of the consumable. The grinder's operating mode is selected depending on this indicator.
Review and testing of the sanding disc, making a felt disc with your own hands:
Despite the fact that the real name of the “grinder” is an angle grinder (angle grinder), the main purpose of this popular tool is cutting materials. Everyone imagines how much effort it took to cut a metal corner or water pipe using a hacksaw for metal. A cutting disc mounted on an angle grinder will cope with such work in a few seconds.
The grinder is a universal tool that allows you to perform the following main types of work:
- Cutting metal, stone and others hard materials;
- Sanding in all its forms, from sanding to mirror polishing;
- Stripping materials of paint, glue and corrosion.
For these works, various attachments (discs) are used.
Various attachments for grinders
The most popular are cutting discs. With their help, you can cut, shape or cut almost any material with a grinder. There are types of work that cannot be completed without application. For example, cut a square hole for ventilation in metal gates garage. Of course, in addition to the specifications for different types processed surfaces, the discs have mechanical parameters.
Description technical characteristics cutting wheel
The main indicator is the disk size. It determines the basic capabilities, especially the depth of cut. But a large diameter is not always a good thing.
Firstly, to use it you need a larger angle grinder. Moreover, a more powerful grinder is needed not only to ensure the landing diameter of the disk. To spin a cutter with a diameter of 230 mm, a motor power of 0.75 - 1 kW will not be enough.
Secondly, large sizes need space. Agree, it is much easier to cut off a rusted exhaust manifold stud under the bottom of your car using a compact grinder with a small disc diameter. Many home craftsmen do not throw away half-ground discs just for such “jewelry” work.
Another example of using a small diameter is cutting out reinforcement from a reinforced concrete wall when installing a switch or circuit breaker block for an electric meter. But cutting a corner of an “eighty” for the construction of a fence or a canopy in the yard can only be done using a disc of 150 mm or more.
Typical cutting disc sizes:
Discs "Foreman" example different sizes
| Thickness (mm) | ∅ 115 mm | ∅ 125 mm | ∅ 150 mm | ∅ 180 mm | ∅ 230 mm | ∅ 356 mm |
| 1,0 | X | X | ||||
| 1,2 | X | X | ||||
| 1,6 | X | X | X | X | ||
| 1,8 | X | |||||
| 2,0 | X | X | X | X | X | |
| 2,5 | X | X | X | X | X | |
| 3,2 | X | X | X |
With a grinder.
This article will orient you in the world of abrasive wheels and will help you accurately and quickly decipher symbols applied by the manufacturer.
Marking - symbols
Abrasive wheels have special markings in the form of inscriptions and/or colored marks and contain:
1. Circle type
In theory, there should be a digital designation:
1- straight profile,
41 - cutting discs,
42 - discs with a recessed center.
But in practice it will be an inscription in Russian and/or English languages: "cut-off wheel" - cutting wheel, grinding wheel - grinding wheel, flap wheel.
2. Circle dimensions
On the manufacturer’s website (see table below) it is stated as follows:
D - outer diameter,
T - height,
H - hole diameter.
However, in practice, the format will usually be: outer diameter x thickness x inner diameter.
Or even something like this:
3. The material for which the disc is intended to be processed
Indicated by an inscription on a circle (“metal” or “steel” - for metal processing, “concrete” - for working with concrete), a colored mark (blue - steel, green - concrete).
Also, sometimes an additional graphic image of the material is applied, which saves us from having to read the inscriptions once again.
On the circle shown in the picture above there is the inscription metal and an image sheet metal, metal pipe, roofing metal sheet and channels clearly demonstrate the material that can be processed.
4. The abrasive material from which the wheel is made
Symbols are available in the table below.
5. Graininess. Abrasive particle sizes
This parameter is indicated on the wheel in conventional units and indicates the abrasive fraction based on international standards markings.
There are also possible variations from one edition of GOST to another.
6.Hardness
See table below.
7. Bundle type
Bakelite, ceramics or synthetic rubber is used as a binding component.
7.1. Ceramic bond
V (K - old designation). In the case of a ceramic base, the instrument has high fire-resistant, water-resistant and chemical characteristics, which qualitatively preserve the working edge. However, such a grinder disc is sensitive to mechanical shocks and bending loads. Ceramic bonded wheels are used for almost all types of grinding except roughing.
7.2. Bakelite bond
B (B is the old designation). Considering the bakelite base, I would like to note that such grinder wheels have higher rates of elasticity and resilience than their ceramic counterparts. The disadvantage of such a binder is its low resistance to alkaline components included in cooling fluids.
In addition, wheels based on bakelite are weaker than ceramic analogues in adhesion to abrasive grains and, therefore, can mainly be used for flat type grinding. Discs for angle grinders on a bakelite bond are used for manual work on rough abrasions or on suspended wall surfaces.
At the same time, bakelite wheels have a polishing effect. For the purpose of cutting steel products, a soft bond and a thin abrasive are used. In turn, for non-ferrous metals it is advisable to use a hard bond with a coarse abrasive.
7.3. Vulcanite bond
This is a vulcanized synthetic rubber. The abrasive wheel is marked with the letter (R). The old designation is (B). This option is exotic and extremely rare.
8. Max. number of revolutions at which the disk can be used
The range varies from 6,600 to 13,300 rpm. Important parameter! If you neglect it, the circle may break into separate fragments during operation.
9. Accuracy class
AA, A and B. AA - high accuracy of geometric parameters A - Intermediate option. B - for less critical operations.
10. Manufacturer
I think no explanation is needed here.
11. Expiration date
The expiration date is applied by the manufacturer to the metal part of the mounting hole on the outside. The expiration date is the date of manufacture plus 3 years. The quarter is indicated by the letter V. The number indicates the month.
Important! Pay attention to the expiration date.
12. Safety pictograms
I guess that no one cares about them, but besides the banal “put on headphones,” something really worthwhile may be applied. For example, do not use for face grinding.
An example of decoding from the website of AbrazivKhimSbyt OJSC
Cutting wheel size 125mm, thickness 2mm, mounting hole 22.23mm, made using normal alumina alumina grinding grain, grit P36. On a bakelite bond with the presence of reinforcing elements.
Pivot table
| 4. ABRASIVE MATERIAL | ||
|
ELECTROCORUNDUM NORMAL |
||
|
ELECTROCORUNDUM WHITE |
||
|
ELECTROCORUNDUM ZIRCONIUM |
||
|
SILICON CARBIDE BLACK |
||
|
SILICON CARBIDE GREEN |
||
| 5. GRAIN | |||
| GRAIN | |||
| 6. HARDNESS | |||
| 7. LINK | |||
|
CERAMIC |
|||
|
BAKELITE |
|||
|
BAKELITE WITH AVAILABILITY |
|||
|
BAKELITE WITH GRAPHITE |
|||
| 8. OPERATING SPEED | |||
|
20; 25; 32; 35; 40; 50; 63; 80; 100 , m/s |
|||
|
6,600 to 13,300 rpm |
| 9. ACCURACY CLASS | |||
It is not necessary to remember all of the above. Bookmark this page and view it immediately before purchasing, for example from your phone.
