[header] How to use a bench grinder [title] Perform a safety check before turning the grinder on. [substeps] Make sure the grinder is tightly secured to the bench. Check that the tool rest is in place on the grinder. 
The tool rest is where the metal item will rest as you grind it. The rest should be secured in place so there is a 1/8 inch (3 mm) space between it and the grinding wheel.