Coordinate-measuring machine capability
Abstract
Three-axis measuring machines have complex geometric and displacement errors. Many machine users are unaware of these systematic errors and think only in terms of the three-scale or displacement errors which may be significantly smaller in magnitude than the geometric errors. A method of estimating the columetric uncertainty of five coordinate measuring machines (CMMs) was established and the measurement uncertainty is reported for a 20 by 18 by 12 in. work zone. The Latin Square Three Dimensional Ball Plate (LS3DBP) and the Space Master Ball Plate (SMBP) were the volumetric standards selected for the evaluation. Data from each ball plate were transformed into new coordinates and compared to previous calibration or reference data. The deviation between measured and referenced values was recorded. These data were used to determine a quantitative estimate of the CMMs measurement capability in X, Y, and Z space by using the Analysis of Variance Technique (AOV).
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- November 1983
- Bibcode:
- 1983STIN...8413544R
- Keywords:
-
- Accuracy;
- Calibrating;
- Data Processing;
- Displacement;
- Machine Tools;
- Temperature Control;
- Coordinates;
- Covariance;
- Data Acquisition;
- Deviation;
- Error Analysis;
- Precision;
- Probability Theory;
- Instrumentation and Photography