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  • Basic Auto Repair Safety

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  • Brake and Clutch Repair Safety

  • Chemicals and Fluids Safety

  • Fire Safety

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  • Grinder Safety

  • Hand Tool Safety

  • Inspection Pit Safety

  • Ladder Safety

  • Physical Lifting Safety

  • Power Tool Safety

  • Spray Painting Safety

  • Steering and Suspension Repair Safety

  • Tire Removal and Replacement Safety

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  • OSHA Requirements for Auto Repair Shops

Grinder Safety

Jon Vorisek
Lawrence Valerio

Written by Jon Vorisek | Reviewed for accuracy by Lawrence Valerio on January 11, 2026

Auto mechanic using a grinder tool on a vehicle

Grinders transform energy into a powerful rotational force applied to a disk. Used for grinding, cutting, or polishing, they present significant hazards if the user loses control or handles the tool in an irresponsible manner.

Inspect the grinding wheel

Never use a damaged grinding wheel. Always inspect grinding wheels before using them:

  • Visually check for for cracks, chips, and grooves.
  • Tap the wheel gently with a screwdriver or similar tool and look for cracks and damage that aren't immediately visible.
  • Listen when tapping the wheel to perform the ring test. According to Simmons, if it gives off a dull sound, the wheel might be damaged and shouldn't be used.
  • Confirm that the wheel is securely attached to the tool and doesn't wobble.
  • Never use a grinding wheel if the labeled RPM speed is lower than the rated speed of the grinder tool.
A cutting wheel in good condition for use on a grinder.
Check that the wheel/disc is in good shape before using it.

Bench vs portable grinders

Some grinders are "bench grinders" meant to be secured to a workbench, while others are designed to be portable. Never use a vise to clamp a portable grinder to a workbench. Similarly, never use a bench grinder that isn't properly secured to a workbench according to the manufacturer's instructions.

A bench grinder properly secured to a workbench.
A bench grinder must be properly secured to a workbench.
Jon Vorisek
Written by Jon Vorisek

Jon Vorisek is the Founder and CEO of Repair Surge, which provides OEM-based repair information to DIY mechanics and professional service technicians. He has a passion for creating software that helps people fix cars safely and effectively.

Lawrence Valerio
Reviewed for accuracy by Lawrence Valerio

Lawrence Valerio is an ASE Master Automobile Technician and an experienced shop manager. He started working on cars at seven years old while learning from his father. He enjoys spending time under the hood and training others in the skills needed to work on today's vehicles.