What is the purpose of the wheel grade in a grinding wheel?

The purpose of the wheel grade in a grinding wheel is primarily to indicate the bond strength of the wheel. The grade specifies how tightly the abrasive particles are held in the bond. A higher grade means that the bond is stronger, which allows less of the abrasive to break away during operation, making the wheel more suitable for tougher materials where more durability is required. Conversely, a lower grade indicates a weaker bond, enabling the wheel to shed some of its abrasives more readily, which can enhance cutting efficiency for softer materials. Understanding the grade is crucial for selecting the appropriate grinding wheel for a specific application, ensuring optimal performance and longevity based on the material being worked on.