What is a necessary safety precaution when using a bench grinder?

Maintaining the tool rest within 1/8 inch of the grinding wheel is essential for safety while using a bench grinder. This close proximity helps minimize the risk of the workpiece getting caught between the tool rest and the grinding wheel, which can lead to kickback or uncontrolled movement of the material. If the tool rest is too far away, it increases the chances of the workpiece slipping or jamming, which can cause serious injury or damage.

Additionally, this small gap ensures that the workpiece has adequate support throughout the grinding process, allowing for more precise and controlled operation. Keeping the tool rest adjusted properly is a vital practice in using a bench grinder safely, contributing to effective grinding while reducing the likelihood of accidents.