Angle Grinder Safety: Cutting, Grinding, and Polishing Safely

An angle grinder is one of the most versatile power tools you can borrow from a tool library. It cuts metal, grinds welds, removes rust, polishes surfaces, and even cuts tile and concrete with the right disc. It is also one of the most dangerous handheld tools in existence. The combination of an exposed spinning disc operating at 8,000 to 12,000 RPM, aggressive material removal, and a shower of sparks and debris creates a tool that demands absolute respect and proper technique. Unlike a circular saw that has a retractable blade guard and a fixed cutting plane, an angle grinder puts a spinning abrasive disc inches from your hands and face with relatively minimal guarding. Injuries from angle grinders include deep lacerations, amputations, eye injuries from flying debris, and burns from sparks igniting clothing or surroundings. Nearly all of these injuries are preventable with proper equipment selection, correct technique, and consistent safety habits. This guide covers everything you need to know to operate an angle grinder safely and effectively, whether you are cutting rebar, grinding down a weld, or polishing a metal surface.