Sheet Metal Trade and SMWIA 1st Year Practice Test

The safety idea here is isolating the grinder from power during maintenance and protecting your eyes from flying debris. Unplugging the grinder before changing disks stops any chance of the machine starting up while you’re handling or installing a new wheel, which prevents a serious injury. Always wearing a face shield plus safety glasses gives solid eye and face protection from sparks, chips, and wheel fragments that can fly off during grinding. Keeping the guard in place is a key safety feature, so removing it would increase risk rather than reduce it. So the safest approach combines unplugging for changes with proper eye protection.