Artifact Calibration of Coordinate Measuring Machine (3rd Report)

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  • 座標測定機のアーティファクト校正 (第3報)
  • ザヒョウ ソクテイキ ノ アーティファクト コウセイ ダイ3ポウ コウセイ ゴ ノ ソクテイ ノ フ タシカ サ ノ スイテイ
  • —Estimation of Uncertainty of Measurements After Calibration—
  • ―校正後の測定の不確かさの推定―

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Abstract

Calibration methods for 3D mechanisms are necessary to use the mechanisms as coordinate measuring machines. The calibration method of the coordinate measuring machine using artifacts, artifact calibration method, has been formulated in taking account of traceability of the mechanism. In this article, estimation methods of uncertainties using the calibrated coordinate measuring machine are formulated. Firstly, a variance and covariance matrix on measuring points is calculated from a variance and covariance matrix of the kinematic parameters of the calibrated measuring machine. Secondly, uncertainties of a size measurement or a point measurement in a workpiece coordinate system are estimated using the error propagation method. Therefore, the estimation methods of uncertainties on the specified measuring tasks are formulated in the artifact calibration.

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