What do you base on when choosing the starting grinding discs? Most of my colleagues may choose it according to the height of the notch on the ground. After we inspected the site, we found that the height between the ground blocks is mostly above 3MM. We generally choose the 30-grit grinding discs for notch grinding. If the height between the stone blocks is mostly below 3MM, then we generally choose 50-grit for processing. This is the experience of most of us, but is it really reasonable to do so?

From the perspective of professional specifications, it is not comprehensive. We choose the starting grinding discs, and the high and low notch between the stone blocks is an important basis for our selection, but it is not the only basis. We also need to refer to the physical properties of the stone to determine.

The physical and chemical properties of stone include: bulk density, water absorption, shore hardness, and compressive strength. The shore hardness in these four items is directly related to our choice of grinding discs.

Shore hardness of stone, as its name implies, is a professional data reflecting the hardness of stone, which is the data obtained by the authoritative organization through experimental testing. The higher the data, the higher the hardness of the stone, which is directly reflected in the grinding, which means that it is more difficult to grind. It takes more passes to smooth the notch, and a sharper grinding disc needs to be selected (the smaller the grinding disc grit, the sharper it is). The smaller the Shore hardness data, the lower the hardness of the stone and the easier it is to grind.

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So how do the physical and chemical properties of the stone guide us to choose the grinding discs？

After understanding the physical and chemical properties of the stone, we know that the choice of grinding discs should not only be based on the height of the stone, but also refer to the Shore hardness of the stone. The height of the ground is large, but the hardness of the stone is very low. At first, 30 grit or 50 grit grinding discs are not needed. We can directly choose 150 grit or even 300 grit.

For example, when we encounter white sand beige stone (its Shore hardness is 33), we can start grinding with 300 grit, no matter how high or low the notch is. For the stone like American white hemp, its high and low notches are not big, but we generally choose to start from 30 grit, because its Shore hardness is 109. After understanding these, the following is a comprehensive consideration when selecting the grinding disc according to the unevenness of the ground and the Shore hardness. This not only improves work efficiency, but also reduces material costs.

We should also pay attention to a problem when choosing a notch grinding disc, that is, the disc must be targeted and professional. How can we say it? That is to choose a professional marble grinding disc for marble grinding, and a granite series stone need to choose professional grinding discs for granite. The ground for grinding and polishing tile series should choose special grinding discs for polished tiles.

If you use a marble grinding discs to grind granite, we know that the notch is too slow to smooth, the efficiency is low, and the labor cost will increase.

When using granite grinding discs to grind marble, the speed of notch grinding will increase, but the grinding discs will be worn out quickly, and the material cost will be greatly increased.

However, using a special grinding disc for marble or granite to grind the polished tile floor may not be able to grind it, and the grinding disc will slip, even if it can be ground, the scratches on the grinding disc will not be easy to eliminate, which will bring great problems to our subsequent processes.