The measuring accuracy of coordinate measuring machines (CMMs) depends on different factors such as the errors associated to the CMM axis movement, the working table and other CMM elements. In order to estimate the measuring errors that can be present during the dimensional evaluation of mechanical components, the nature and relevance of the distinct factors involved in the inspection process should be properly identified, such as the position errors, straightness errors, part errors and other geometrical and dynamic deviations. The knowledge about the influence of the main errors related to the elements integrated in the CMM, can serve to estimate the expected accuracy during the geometrical evaluation of manufactured products or machinery components. In this work, the effect of position errors will be evaluated by separate in order to deduce the contribution of this factor to the resultant measuring accuracy. This study is oriented to the analysis of three-axis coordinate measuring machines, and distinct types of CMM axis errors will be discussed. The results shown in this work are focused on CMMs type FXYZ, although similar studies could be developed for other structural configurations.

坐标测量机（CMM）的测量精度取决于不同的因素，例如与CMM轴运动，工作台和其他CMM元素相关的误差。为了估计在机械零件尺寸评估中可能出现的测量误差，应正确识别检查过程中涉及的不同因素的性质和相关性，例如位置误差，直线度误差，零件误差等几何和动态偏差。有关与CMM中集成的元素有关的主要误差影响的知识，可用于估计制造产品或机械零件的几何评估过程中的预期精度。在这项工作中 位置误差的影响将通过单独评估，以推断该因素对最终测量精度的影响。本研究主要针对三轴坐标测量机的分析，并将讨论不同类型的CMM轴误差。尽管可以针对其他结构配置进行类似的研究，但这项工作中显示的结果集中于FXYZ型CMM。