偶尔出现的表面问题，例如图案和振痕，尤其是在使用旋转修整工具时，迫使我们对原因进行更仔细的调查。根据旋转修整工具、砂轮和工件之间的速度比，可以改善或恶化表面几何形状。修整工具本身起着至关重要的作用。根据汽车行业的实例和上述试验，解释了质量缺陷的原因和消除这些缺陷的措施。

SURFACE PROBLEMS THAT OCCUR SPORADICALLY SUCH AS PATTERN AND CHATTER MARKS, PARTICULARLY WHEN USING ROTATING DRESSING TOOLS, FORCED US TO MAKE A CLOSER INVESTIGATION OF THE CAUSES. DEPENDING ON THE SPEED RATIO BETWEEN THE ROTATING DRESSING TOOL, GRINDING WHEEL AND WORKPIECE, THE SURFACE GEOMETRY CAN BE IMPROVED OR WORSENED. THE DRESSING TOOL ITSELF PLAYS A CRUCIAL ROLE. ON THE BASIS OF PRACTICAL EXAMPLES FROM THE AUTOMOTIVE INDUSTRY AND THE TESTS AS STATED, THE CAUSES FOR QUALITY DEFECTS AND MEASURES TO ELIMINATE THESE ARE EXPLAINED.