When should a tool rest be adjusted before using a grinder?

The tool rest should be adjusted prior to using the grinder to ensure safety and effectiveness during operation. Properly setting the tool rest before grinding helps maintain the appropriate distance between the rest and the grinding wheel. This distance is crucial as it allows for better control and precision when shaping or sharpening materials. It also minimizes the risk of the workpiece becoming snagged or getting caught in the grinding wheel, which can lead to accidents or damage.

Adjusting the tool rest after turning on the grinder or during its operation can introduce unnecessary risks, as it might expose the operator to moving parts and could lead to unforeseen dangers. Furthermore, making adjustments after several uses does not address the need for initial safety checks and can contribute to inefficiencies or unsafe working conditions. Therefore, ensuring the tool rest is correctly set before initiating any grinding task is essential for both safety and optimal performance.