What is the maximum allowable distance for the tool rest from the grinding wheel for safety?

The maximum allowable distance for the tool rest from the grinding wheel is 3 mm for safety reasons, as this minimizes the risk of the workpiece snagging or being pinched between the tool rest and the grinding wheel. Keeping this gap small ensures that there is sufficient support for the workpiece while also preventing excessive wear on the wheel and reducing the chances of injury from sudden movements or disruptions during the grinding process. This standard is essential for maintaining both the effectiveness of the grinding operation and the safety of the operator, as it facilitates more precise control over the grinding activity and helps prevent accidents that can arise from larger gaps.