Grinding Machine Operator Procedure: A grinder operator sets the piece of metal between two centers, called head and tail stocks. He or she operates the machine; the cylinder rotates in one direction. Then, the grinding wheel moves in the opposite direction at a different speed to start grinding. A grinder chooses the appropriate cutting wheel to achieve the necessary cuts needed according to the design schematics and instructions provided by the engineer. It is vital that a candidate understands how to use Landis grinding equipment properly to perform duties safely and quickly.