This document discusses common grinding errors, their causes, and remedies. It describes errors such as grinding with comma signs caused by abrasive grains in coolant, grinding with dull wheels caused by fine grinding wheels or dull dressing tools, and grinding with burning marks caused by overheating during processing. Remedies include better filtering coolants, dressing tools more frequently, increasing coolant flow, and reducing material removal rates. The document also covers geometrical errors like dimensional errors from wheel wear, tapered workpieces from coolant pressure or wheel pressure, and roundness errors from non-circular workpiece centers.