Angle Grinders & Abrasive Wheels Safety

What is the 'Ring Test' used for prior to mounting a vitrified abrasive wheel onto a grinder?

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 Correct IncorrectTapping a sound wheel lightly with a wooden screwdriver handle produces a clear metallic ring. A dull thud or clunk indicates an invisible internal hairline crack that could cause wheel failure.

What is the 'Ring Test' used for prior to mounting a vitrified abrasive wheel onto a grinder?

• Tapping gently with a non-metallic tool to detect internal hairline cracks by sound
• Checking if the steel center ring is magnetized
• Measuring the decibel noise level during operation
• Checking if the arbor hole fits onto the spindle