The grinding wheel must be carefully inspected and identified before installation. The steps to check the authentication are:
1. Check if the grade of the grinding wheel is correct and whether it meets the performance, shape and size of all selected grinding wheels.
2. Check and identify the appearance of the grinding wheel. Use your eyes to see if the wheel is damaged (or has cracks). A grinding wheel with a damaged appearance (or a crack) cannot be used. In addition, there is a requirement that both ends of the grinding wheel be flat and there must be no obvious skew. 3. Inspect and identify the internal crack of the grinding wheel. With a hand-held grinding wheel, tap the grinding wheel with a wooden hammer to hear the sound. The cracked wheel gives a crisp sound, and the cracked grinding wheel is hoarse, which cannot be used.
