What must be indicated on a grinding wheel regarding its operation?

• A. Weight limits
• B. Speed
• C. Material type
• D. Color code

Answer: (B)

The information regarding the operational speed of a grinding wheel is critical for safe and effective use. Each grinding wheel is designed to operate within a specific range of speeds, typically measured in revolutions per minute (RPM). This is essential because exceeding the recommended speed can lead to catastrophic failures, including the possibility of the wheel shattering and causing serious injury to the operator or damage to the equipment.

The speed rating is usually marked clearly on the grinding wheel, often on the label or directly on the wheel itself, to ensure that users can easily check and verify that their grinder's RPM settings are compatible. Understanding and adhering to the correct operational speed maximizes the wheel's performance and helps prevent accidents and equipment failure.

While weight limits, material type, and color codes may provide relevant information, they do not directly influence the operation and safety of the grinding wheel as significantly as the specified speed.