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SESK: Stuff Everyone Should Know · sesk.info/weld-grinding-wheel-ring-test

What is the 'ring test' done on a grinding wheel before mounting it?

Tapping it and listening for a clear ring to detect cracks.

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  1. Measuring the arbor hole with a gauge
  2. Spinning it to read its speed
  3. Tapping it and listening for cracks ✔

Why: A sound wheel rings clearly. A dull thud means a hidden crack, and a cracked wheel can fly apart at speed, so it must not be used.

Huh, didn't know that: OSHA says to tap light wheels with a screwdriver handle and heavier wheels with a wooden mallet, and the wheel must be dry.

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References

Answer: Tapping it and listening for cracks. A sound wheel rings clearly. A dull thud means a hidden crack, and a cracked wheel can fly apart at speed, so it must not be used.

  1. OSHA 29 CFR 1910.215 Abrasive wheel machinery www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.215
    Immediately before mounting, all wheels shall be closely inspected and sounded by the user (ring test).
    Checked 2026-10-10.

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