Application of Simulation Software to Coordinate Measurement Uncertainty Evaluations (original) (raw)
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Journal of Manufacturing Processes, 2007
The continual use of coordinate measuring machines (CMMs) in high-volume manufacturing has led to several applied standards. With the ever-increasing emphasis on quality, annual certification of conformity by a qualified outside calibration service is no longer adequate. An artifact can be used in an interim testing plan to evaluate machine performance between certifications. The objective of this paper is to evaluate the design of artifacts, evaluate the analytical procedure to estimate certain characteristics of CMM performance, and evaluate the artifacts' repeatability and accuracy measurements. The capability of two traceable artifacts (one 2-D and one 3-D design) and a machine checking gage were assessed. The results indicate that an artifact can be used for interim performance evaluation but not for calibration or certification.
Task specific uncertainty estimation in dimensional metrology
International Journal of Precision Technology, 2011
With the acceptance of ISO standard 14253-1 [1], the requirement for the treaceability and uncertainty in dimensional measurements is extended from the measuring instruments to artefacts or industrial products which are measured with those instruments. For the calibration and uncertainty estimation of length standards and instruments, various methods are available for which usually an uncertainty budget according to the GUM [2] can be set up. However, especially where many measured data are involved, such as in CMM measurements, but also in typical dimensional geometry measurements such as roughness, roundness and flatness measurements, setting up an uncertainty budget according to the GUM for each measurement can be tedious and is a rather impossible demand.
Uncertainty of Measurement for Design Engineers
Procedia CIRP, 2016
Paper presents simple software for evaluation of uncertainty for measurements carried out on CMMs. The input data are coefficients from MPE E formulae for CMM as well as metrological characteristic (type of dimension or geometrical deviation). The evaluated uncertainty enables the designer preliminary judgement if the available measuring equipment enables proper verification of the products (if the assumed tolerances are not too narrow comparing to possibilities in the range of product verification). Attention is brought to the fact that on up-to-date technical drawings, to achieve unambiguous interpretation, more often tolerances of position and tolerance of profile any surface are used. The operation of the EMU-CMMUncertainty TM software is discussed. On a few examples of coordinate measurement models the software principle of work is explained and uncertainty budgets presented.
State of the art in evaluation of uncertainty of coordinate measurements
Quality - Access to Success
Evaluation of uncertainty of coordinate measurements is the subject of a few documents of ISO 15530 series and many publications. One of the ISO documents, the ISO 15530-3:2011, has already the status of a standard. Another ISO document's status is technical specification (ISO/TS 15530-4:2008). There were further two parts of the ISO 15530 series under development: Part 2 Use of multiple measurements strategies in calibration artefacts and Part 5 Use of expert judgement. There is also the VDI/VDE 2617-11guideline concerning the subject. One can find a lot of publications concerning the coordinate measurement uncertainty. The authors are also developers of the software for determination of the uncertainty of coordinate measurements by means of the type B evaluation. The paper presents wide analysis of the state of the art and practical use of the available techniques for uncertainty evaluation.
Task-Specific Uncertainty Evaluation of Coordinate Measurements Using Multiple Calibrated Workpieces
This paper deals with an important source of variation often neglected in the estimates of measurement uncertainty of coordinate measurements: the part-to-part bias variation. The origins of this source of variation are briefly discussed, and an experimental method using multiple calibrated workpieces designed to include it into measurement uncertainty is described. The method was applied on the uncertainty evaluation of roundness measurements by scanning on calibrated workpieces, showing the relevance of the bias variation for the measurement uncertainty of coordinate measurements.
Coordinate measurement uncertainty: Models and standards
Tm-technisches Messen, 2015
The paper presents the measurement models for the evaluation of measurement uncertainty included in ISO 15530-3. Critical remarks to ISO 15530-3:2011 are given. A model for an analytical method developed by the authors is presented. Finally, a numerical example for the simplified version of the method is given.
A case study on testing CMM uncertainty simulation software (VCMM)
Journal of the Brazilian Society of Mechanical Sciences and Engineering
Virtual Coordinate Measuring Machines (VCMMs) are software packages aimed at providing uncertainty estimates for tridimensional measurements. Since they deal with metrology data to derive uncertainty estimates, which are to be used for making decisions related to product quality, they must be evaluated. Although there are international standards to deal with software testing for metrology, the evaluation of VCMMs performance is still in the experimental stage. Here a testing framework was organized focusing on the definition of the test context, the test purpose, the performance criteria and the testing strategy, including the usability of the VCMM interface, which is a common focus in software engineering but not in tests of metrology applications. Experimentation and reference data were also used to check the adequacy of uncertainty estimates against measurement results. The executed tests show that it is possible to provide the necessary evidence of acceptable VCMM performance. I...
Estimating the Reliability and Uncertainty of Coordinate Measuring Machines by Numerical Method
Third International Conference on Advances in Civil, Structural and Mechanical Engineering - ACSM 2015, 2015
This research develops an alternative approach for the prediction of uncertainty of multi axis machines, Coordinate Measuring Machine (CMM), by using geometric error information in each axis or repeatedly measured coordinates. It also introduces a procedure to calculate the probability of accepting a measured position within a specified range. The developed model has resulted in an improvement in the probability of accepting a measured position, compared to previously published models and results.