EVALUATION OF SURFACE PLATE CHARACTERISTICS USING LASER SYSTEM AT MEASUREMENT STANDARDS LABORATORY |
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| Faheem Mohammad, Syed Fazil, Luai M. Al-Hadhrami |
- Abstract:
- Surface plate characteristics influence the calibration of artifacts, instruments, working gauges and, by extension, the quality of manufactured parts. Industrial surface plates are calibrated periodically. Moody or Union Jack Method is applied to calibrate the surface plate alongside the application of latest laser equipment. This procedure necessitates sophisticated tooling and the pertinent calibration sequence to obtain the reliable results. In this method, the residual height at each position on the surface is expressed in terms of measurement parameters. A statement of uncertainty for the surface plate calibration is needed for conformance testing and for estimating uncertainty in calibrations that rely on the surface plate. The maximum uncertainty is at the center of the surface as per the Moody Method and the calculated bounds compare well with values of closure from actual measurements. The uncertainty of height values is proportional to the measurement positions. Measurement Standards Laboratory (MSL) operates under the Total Quality Management Scheme and in conformity with ISO/IEC-17025: General requirements for the competence of testing and calibration laboratories guidelines. The paper discusses the novel approach towards determining the flatness characteristics of the surface plate measurement uncertainty of flatness measurement applying the universally most reliable Moody Method. Furthermore, the impact of grid parameters such as alignment side, measurement sequence and number of measurement steps on measurement results is evaluated. The reproducibility of the obtained results is ascertained using the laser optics. Subsequently, the measured data points are fed into a stand-alone computer program which displays numeric as well as isometric data plots for the surface plate in measurement.
- Keywords:
- flatness, laser optics, laser alignment, surface plate calibration, uncertainty analysis
- Download:
- IMEKO-TC14-2014-17.pdf
- DOI:
- -
- Event details
- IMEKO TC:
- TC14
- Event name:
- TC14 LMPMI Symposium 2014
- Title:
11th Symposium on Laser Metrology for Precision Measurement and Inspection in Industry
- Place:
- Tsukuba, JAPAN
- Time:
- 03 September 2014 - 05 September 2014