This grinder really looks like a cup. Diamond grit on its surface allows you to process the most durable materials that can be found in everyday life. The nozzle can provide an invaluable service if you need to process a natural stone of any breed, be it marble or granite. It can also be used to grind concrete and brick.
The grinder with which the cup is used must be quite powerful, otherwise it simply will not master the friction when working with concrete. Grinding machines with a power of less than 1500 W will stop at the slightest pressure on the surface to be treated. This is not only unpleasant, but threatens to break the device. So don't even bother sanding a concrete floor if you only have a small hobby grinder. You need a tool with a power of at least 1800 watts.
Varieties
There are different diamond cups (for a grinder) that can be processedconcrete. All inexpensive circles are the same in diameter, which is 125 mm. Bore radius is standard for all discs - 11mm.
The same holes are located around the entire circumference of the nozzle. They perform two functions. Firstly, with their help, the mass of the circle is reduced. Secondly, they act as a heatsink, without which the diamond coating would overheat.
The first difference that separates the diamond grinding cups is that the number and thickness of the segments are different. Without touching on the rare and not very popular models yet, let's focus on the two most commonly used types, suitable for all kinds of home repairs.
Focus on the turbo-segmented cup and nozzle with two rows of segments.
Double row cup
Rough processing of concrete and hard rocks is done with a two-row sharpening part. The nozzle is perfect for grinding a concrete screed, even if you need to remove a rather thick layer from it - 2 cm or more. With its help, the grinder will blast the surface of the concrete as if it were oil, and the task will not seem as difficult as if you were working with any other tool.
Among expensive products of this type, you can pick up parts with a larger diameter, for example, 150 or even 230 mm. These large double-row diamond cups make it a lot easier if you need to work a large surface area, but they are priced to match the pleasure you get. A disc with a diameter of 180 mm costs at least 1300 rubles. Soif the task is to polish a small area of the floor, it may not make sense to buy expensive components, but to get by with the usual one.
Segmented Turbo model
Sharpening cup, the diamond surface of which allows for finer work with concrete and stone, called "Turbo". Segments in a continuous row pass along the circumference of the nozzle. The gaps between them are narrow, they are located close to each other. In construction, a cup of this type is successfully used to create beautiful edges and chamfers on stone and concrete blocks. Wherever you need not rough processing, but thorough and high-quality, it would be advisable to use this tool.
Often, craftsmen use this particular cup when working on stone products, which are characterized by smooth curves of forms. Sculptors and engravers use it among other tools.
Turbo cup is convenient for grinding fine details of granite or marble monuments, blocks, columns and so on. After finishing work with a grinder, the product is polished with a flexible diamond disc.
Producers
If there is a need to grind something even finer, requiring precision and accuracy, then you can buy grinding diamond cups, the diameter of which is smaller than the standard one. Products manufactured by Distar are 100 mm in diameter. They are quite high quality and are considered professional models. They are preferred by other stone craftsmen because the Distar cups are really handy for grinding marble and granite. They are professional tools and are designed for everyday use.work. Therefore, they will not have to be changed after the first attempt to polish something.
Key Features
A diamond cup is of high quality or not, depending on whether all three main characteristics meet the standards. Among the properties by which you can judge the level of this tool, you can highlight the following:
- Link type.
- The quality and graininess of the coating that covers the surface of the working part of the cup.
- Concentration of diamond particles in the diamond coating layer.
If any of these parameters is unsatisfactory, then the product will not last long.
Let's look at the main types that exist.
Organic
This bond is characterized by a slight hardness. The diamond grinding cup for concrete, the coating of which is organic, allows you to process the material quickly and efficiently. It does not get very hot due to its heat resistance. The material does not conduct heat well. A layer of concrete or stone is removed quickly and easily.
Circles with such a bond are used for finishing work, when it is necessary to bring an already processed surface to an ideal state.
They also sharpen tools made from hard steels, and generally process anything made from hard, unyielding material.
Metal
Metal bond also has inherent strength and performance when removing a layer of hardmaterial. However, it heats up more due to the high thermal conductivity of the metal. Because of this, the duration of continuous work with a grinder equipped with this nozzle has to be reduced.
Similar wheels are used to grind parts made of hard metals, cut ceramics and hard-to-cut materials, and perform primary processing of concrete and stone products.
The cup, whose diamond surface is realized using a metal bond, is also well suited for detailing surfaces already machined with a rough disc.
Galvanic
If you need a diamond cup for sharpening metal parts, then a disc with a galvanic bond is not the best option. However, it is the best suited for cutting technical glass, silicon, germanium; for processing stone at the texture level; for the manufacture of diamond heads; for making tools.
Discs with such a bond are relatively inexpensive, cut well, allowing you to create any geometric shapes, conduct heat well. Due to their thermal conductivity, they cannot be worked for a long time, you need to give time to cool the material from which they are made.
Diamond coating on such cups can be applied in one or two layers. Diamond particles are fixed with a layer of nickel. The thickness of the fixing layer depends on the size of the diamond particles.
Grainy
Sanding cups can be coated with fine, coarse or medium grit. The grain size is indicated by two numbers. Fine-grained circles are marked with a value of 100/80. A coarse-grained product is indicated as follows: 200/160.
If you want a good concrete diamond cup for most repairs, feel free to get the 165/100 grit model.
A larger grit is useful for rough work or when you need to remove a thick layer from a metal surface. Fine-grained discs are used for sharpening knives and detailing already processed coatings.
For an example, consider the process of sharpening a knife.
Cup with coarse grain can change the shape of the cutting part of the blade. The medium-grained cup corrects the defects remaining after rough processing. The final finishing is done with a fine grit nozzle.
If the letters AC are indicated in the marking, it means that synthetic diamond crystals are used in the coating of the cup. This is normal, it is from this material that grinding discs are most often sprayed.
Owner Reviews
The grinding cup is a really necessary item in construction. This can be easily verified by reading some of the reviews of people who have been using it for home purposes for a long time.
Often, a cup is purchased for grinding a concrete floor, when you want to remove an impressive layer of screed. At the same time, the work, which seemed like hard labor for several days, takes only a few hours. There is a lot of dust, but, as users note, the tool is not to blame.
Some use itto create figures from stone, as well as to chamfer bricks and blocks.
