Grinding Wheel Inspection and the Ring Test
29 CFR 1926.303 · This talk in Spanish
Why it matters
If a grinding wheel shatters, the pieces fly off the tool hard and fast. Wheels break because they were cracked before mounting, mounted wrong, run over speed, or slammed into the work. OSHA requires every wheel to be inspected and ring tested before mounting, and guards kept in place. Today: how to check a wheel, mount it, and run it so it stays in one piece.
Hazards
- ⚠ Wheel explosion from cracks, wrong mounting, or over-speeding
- ⚠ Fragments and sparks to the face and eyes
- ⚠ Kickback when the wheel binds in the cut
- ⚠ Guards removed or rotated out of position
- ⚠ Wrong wheel for the tool or material: cutting with a grinding wheel and vice versa
- ⚠ Wheels stored loose, damp, or under other material
Controls and safe practices
- ✓ Inspect and ring test every wheel before mounting: tap it gently with a screwdriver handle, and if it sounds dead or cracked, do not use it.
- ✓ Match the wheel RPM rating to the tool: the wheel maximum must meet or beat the tool speed.
- ✓ Mount with the right flanges and blotters, and tighten the nut only enough to hold the wheel.
- ✓ Guard on, positioned between you and the wheel, always.
- ✓ Use the right wheel: type and material for the job, no side grinding on cutoff wheels.
- ✓ Face shield over safety glasses for grinding; sparks find the gap otherwise.
- ✓ Store wheels dry, flat or racked, and never mount one that has been dropped.
Crew discussion questions
- Who actually ring tests wheels here, and can everyone describe the sound difference?
- Are any of our grinders missing guards right now?
- What wheel types are on the truck, and what is each one for?
- Where do dropped or suspect wheels go so nobody mounts them?
Applicable OSHA standards
29 CFR 1926.303
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