When we talk about the grit of diamond grinding discs, we often come across the concept of “diamond grit”. The lower the diamond grit number, the larger the abrasive grains; the higher the diamond grit number, the smaller the abrasive grains. For example, a 30-diamond grit grinding disc has larger abrasive grains and stronger cutting force during processing; while an 800-diamond grit grinding disc has finer abrasive grains and is more suitable for fine grinding operations.
Characteristics of grinding discs with different diamond grit
Coarse-grained grinding disc (30-150 diamond grit)
Coarse-grained grinding discs, such as 30 diamond grit, 50 diamond grit, 100 diamond grit, 150 diamond grit, etc., have larger abrasive grains, which gives them strong grinding capabilities. In the initial stage of stone processing, such as land reclamation, facing rough and uneven stone surfaces with a large number of protrusions and unevenness, coarse-grained grinding discs can quickly cut off a large amount of stone materials, efficiently eliminate the height difference of the stone surface, and make the stone surface initially flat.
In the rough grinding process, for those tasks that require quick removal of stone thickness, change of stone shape or size, coarse-grained grinding discs also perform well. Take a granite slab with an uneven surface as an example. Using a 30-grit coarse-grained grinding disc, the raised parts of the slab surface can be ground flat in a short time, laying the foundation for subsequent processing. However, due to the large abrasive grains, the scratches on the stone surface during the grinding process are deeper and wider, so the surface of the processed stone is relatively rough and has a low finish.
Medium-grained grinding disc(300-500 diamond grit)
The abrasive grains of medium-grained grinding discs are moderate in size, and their grinding action is relatively uniform during the grinding process. After the stone is initially processed by the coarse-grained grinding disc, although the surface is basically flat, there are still deep scratches and unevenness. At this time, the medium-grained grinding disc plays an important transitional role. It can further remove the marks left by the coarse grinding, make more detailed corrections to the stone surface, and significantly improve the flatness and smoothness of the stone surface.
For example, when renovating a marble floor, using a 300-diamond grit medium-grained grinding disc can further refine the scratches on the marble surface after rough grinding, making the floor look smoother and preparing for the subsequent fine grinding and polishing process. The scratches on the stone surface after being processed by the medium-grained grinding disc are significantly lighter and less, and the overall texture and aesthetics have been greatly improved, laying a good foundation for achieving the final high-gloss surface.
Fine-grained grinding disc(1000-3000 diamond grit)
The abrasive grains of the fine-grained grinding disc are extremely small, such as 1000 diamond grit, 2000 diamond grit, 3000 diamond grit, etc. In the fine grinding and polishing stage, the advantages of the fine-grained grinding disc are fully demonstrated. It can grind the stone surface extremely finely, completely eliminate the subtle flaws and marks on the stone surface, and make the stone surface reach high gloss, presenting a smooth mirror-like effect. Taking a piece of granite that has been coarsely and medium-ground as an example, fine grinding with a 2000-diamond grit fine-grained grinding wheel can completely remove tiny scratches on the surface of the stone, greatly improving the glossiness of the stone surface; then polishing with a 3000-diamond grit grinding wheel will eventually make the surface of the granite present a mirror-like luster and feel smooth and delicate, greatly improving the decorativeness and aesthetics of the stone.
