Abstract: The cube-mirror is used as process reference for the spacecraft products manufacturing. To analyzing calibration precision for cube-mirror based on CMM, tests with different sampling strategies were done, the repeatability data of the measurement for cube-mirror angle is obtained.Besides, two theoretical analysis methods of analytical and Monte Carlo method are used to calculate the measuring uncertainty for the angle between the adjacent surfaces of the cube-mirror respectively. Data show that, the results of experiment and theoretical analysis are consistent, the measurement uncertainty of the angle between the adjacent surfaces of the cube-mirror obtained by the two theoretical analysis methods is almost the same, the measurement uncertainty of the angle decreases with the increase of the number of sampling points, the minimum value is close to 0.0020°.The method of theoretical analysis can be used to evaluate the calibration precision and planning sampling of cube-mirror for measuring task.

Key words: Cube-mirror, Calibration precision, CMM, Measurement uncertainty