This grinder grinding head really looks like a cup. Diamond chips on its surface allows you to process the most durable materials from those that can be found in everyday life. The nozzle can provide invaluable service if you need to process natural stone of any breed, whether 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. Grinders with a power of less than 1,500 W will stop at the slightest pressure on the surface to be treated. This is not just unpleasant, but threatens to break the device. Therefore, do not even grind on a concrete floor if you have only a small amateur grinder. We need a tool whose power is not less than 1800 watts.
Varieties
There are different diamond cups (for grinders) that can be used to process concrete. All inexpensive circles are the same in diameter, which is 125 mm. The radius of the inner hole is standard for all discs - 11 mm.
Along the entire circumference of the nozzle are the same holes. They perform two functions. Firstly, with their help the mass of a circle decreases. Secondly, they play the role of a radiator, without this, diamond spraying would overheat.
The first difference separating grinding diamond cups is that the number and thickness of the segments are different. Without touching on rare and not very popular models, we will focus on the two most commonly used types, suitable for various kinds of home repair work.
The focus is on a cup with turbo segmentation and a nozzle with two rows of segments.
Double row cup
Rough processing of concrete and hard stone is performed by a two-row grinding part. The nozzle is perfect for grinding concrete screeds, even if you need to remove a rather thick layer from it - 2 cm or more. With its help, the grinder will blow up 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 the expensive products of this type, you can pick up parts of a larger diameter, for example, 150 or even 230 mm. These large double-row diamond cups greatly facilitate the task if you need to process a large surface area, but their price corresponds to the pleasure you receive. A disk with a diameter of 180 mm costs at least 1300 rubles. Therefore, if the task is to grind a small area of the floor, maybe it makes no sense to buy expensive components, but to do the usual.
Segmented Turbo Model
A sharpening cup, the diamond surface of which allows for finer work with concrete and stone, is called "Turbo". The solid segments run around the nozzle circumference. The gaps between them are narrow, they are located tightly 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 will be advisable to use this tool.
Often, craftsmen use this particular cup when working on stone products, which are characterized by smooth bends of shapes. Sculptors and engravers use it among other tools.
It is convenient to grind small details of granite or marble monuments, blocks, columns and so on with a “turbo” cup. After finishing work with the grinder, the product is ground with a flexible diamond disk.
Manufacturers
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. Distar products are 100 mm in diameter. They are quite high quality and are considered professional models. They are preferred by other masters working with stone, because Distar cups are really convenient to grind marble and granite. They are professional tools and are designed for daily work. Therefore, they will not have to be changed after the first attempt to polish something.
Main characteristics
A diamond cup is of high quality or not so much depending on whether all three main characteristics comply with the standards. Among the properties by which one can judge the level of this tool, one can distinguish the following:
- Type of ligament.
- The quality and granularity of the spraying that covers the surface of the working part of the cup.
- The concentration of diamond particles in the layer of diamond spraying.
If any of these parameters is unsatisfactory, then the product will not last long.
Let's look at the main of the existing types.
Organic
Such a bundle is characterized by low hardness. A diamond grinding cup for concrete, the coating bond of which is organic, allows you to process the material quickly and efficiently. It does not heat up very much due to its heat resistance. 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 grades of steel, and generally process everything that is made of solid, unyielding material.
Metal
The metal bond is also inherent in strength and performance when removing a layer of solid material. However, it heats up more strongly due to the high thermal conductivity of the metal. Because of this, the duration of continuous operation of the grinder equipped with this nozzle has to be reduced.
Parts made of hard metals are ground in such circles, ceramics and hard-to-cut materials are cut, and primary processing of concrete and stone products is carried out.
A cup, the diamond surface of which is realized using a metal bond, is also well suited for detailing surfaces that have already been treated with a rough disk.
Galvanic
If you need a diamond cup for sharpening metal parts, then a disk with a galvanic bond is not the most suitable option. However, it is the best suited for cutting technical glass, silicon, germanium; for processing stone at the invoice level; for the manufacture of diamond heads; for making tools.
Disks with such a bunch are relatively inexpensive, cut well, allowing you to create any geometric shapes, conduct heat well. Due to thermal conductivity, they can’t work for a long time, you need to give time to cool the material from which they are made.
The diamond coating on such cups can be applied in one or two layers. The particles of diamond are fixed with a layer of nickel. The thickness of the fixing layer depends on the size of the diamond particles.
Grain
The coating of the grinding cups can be fine, coarse or medium grained. Grain size is indicated by two digits. Fine-grained circles are marked with a value of 100/80. A coarse-grained product is designated as: 200/160.
If you need a good diamond cup for concrete, suitable for most repairs, feel free to purchase a model with a grain size of 165/100.
Larger grain is useful for roughing work or in cases where 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 example, consider the process of sharpening a knife.
A cup with a large grain can change the shape of the cutting part of the blade. With a medium-grained cup, the defects remaining after rough processing are corrected. The final fine-tuning is done with a small grain nozzle.
If the letters AC are indicated in the marking, it means that crystals of synthetic diamonds are used in the coating of the cup. This is normal, it is from such a material that the grinding disks are most often sprayed.
Owner reviews
A grinding cup is really a building item. This can be easily verified by reading some reviews of people who use it for domestic purposes for a long time.
Often a cup is acquired for grinding a concrete floor when it is required to remove an impressive layer of a coupler. At the same time, 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 it to create figures from stone, as well as to chamfer bricks and blocks.