Before mounting abrasive wheels, which actions are required?

• A. Closely inspected
• B. Use ring test
• C. Both closely inspected and ring test
• D. Neither

Answer: (C)

Ensuring wheel integrity is the key idea here. Before mounting an abrasive wheel, you must verify it is sound through two checks. First, closely inspect the wheel for any cracks, chips, or other damage that could weaken it during operation. Even small flaws can propagate under load and lead to wheel failure. Second, perform a ring test by lightly tapping the wheel around the rim with a wooden or plastic tool and listening for a clear, resonant ring. A dull sound or missing ring can indicate internal cracks or defects not visible to the eye. If either check reveals damage, the wheel must not be mounted. Using both checks together is essential because some cracks aren’t visible, and mounting a compromised wheel can result in catastrophic failure, posing serious injury risks. After confirming integrity, proceed with proper mounting per manufacturer instructions, ensuring compatibility of speed, flanges, and guards, and perform a safe test run.