How far must the tool rest be set away from the grinding wheel when using a bench grinder?

The tool rest must be set 3 mm away from the grinding wheel when using a bench grinder. This distance is important for safety and optimal performance. Keeping the tool rest at this distance helps to ensure that there is a minimal gap between the tool rest and the wheel, allowing for better support of the workpiece while avoiding the risk of it getting pinched or caught in the wheel.

If the distance were too small, it could lead to potential hazards such as jamming or binding of the tool against the grinding wheel. On the other hand, if the rest is set too far away, it would not provide adequate support for the item being ground, leading to decreased precision and control during operation. Thus, maintaining a 3 mm gap is the standard practice that balances safety and functionality when using a bench grinder.