Large aspheric surface which have the deviation with spherical surface are being used widely in various of optical systems. Research on the method of improving the accuracy of CMM (coordinate measuring machine) testing aspheric surface Data was gathered, analyzed, and simulated from seven machines in seventeen different configurations to create statistical process control run charts for on-the-floor monitoring.« less This off-the-shelf product simulates a large sphere within a CMM’s measurement volume and allows for error estimation. The CMM interimmore » check discussed makes use of Renishaw’s Machine Checking Gauge. In an effort to reduce risk to product quality two solutions were proposed – shorten the calibration cycle which could be costly, or perform an interim check to monitor the machine’s performance between cycles. Unfortunately, several nonconformance reports have been generated to document the discovery of a certified machine found out of tolerance during a calibration closeout. Calibration cycles for CMMs at LANL are predominantly one year in length. ![]() It can help CMM users to conveniently complete the measurement uncertainty evaluation through a single measurement cycle.Ĭoordinate Measuring Machines ( CMM) are widely used in industry, throughout the Nuclear Weapons Complex and at Los Alamos National Laboratory (LANL) to verify part conformance to design definition. The SVCMM method is verified to be feasible and practical. The evaluation example is presented, and the results are evaluated by the traditional method given in GUM and the proposed method, respectively. This method makes full use of the CMM acceptance or reinspection report and the Monte Carlo computer simulation method (MCM). ![]() Taking dimension measurement as an example, this paper puts forward a practical method of uncertainty modeling and evaluation of CMM task oriented measurement (called SVCMM method). Task oriented uncertainty evaluation has become a difficult problem to be solved. Li, Hongli Chen, Xiaohuai Cheng, Yinbao Liu, Houde Wang, Hanbin Cheng, Zhenying Wang, Hongtaoĭue to the variety of measurement tasks and the complexity of the errors of coordinate measuring machine ( CMM), it is very difficult to reasonably evaluate the uncertainty of the measurement results of CMM. ![]() Uncertainty Modeling and Evaluation of CMM Task Oriented Measurement Based on SVCMM This paper discusses some characteristics of the Sheffield machine control and analysis software and my use of H-P Basic language to create automated measurement programs to support the B89 performance evaluation of the CMM. This combinationmore » provides efficient use of the measuring machine with a minimum of keyboard input plus an analysis of the data with respect to the B89 Standard rather than a CMM analysis which would require subsequent interpretation. Although it would be possible to use the interactive measurement system to perform these tasks, a more thorough and efficient job can be done by creating Function Library programs for certain tasks which integrate Hewlett-Packard Basic 5.0 language and calls to proprietary analysis and machine control routines. The performance of the machine was specified to conform to B89 standard which relies heavily upon using the measuring machine in its intended manner to verify its accuracy (rather than parametric tests). The Inspection Shop at Lawrence Livermore Lab recently purchased a Sheffield Apollo RS50 Direct Computer Control Coordinate Measuring Machine. Function library programming to support B89 evaluation of Sheffield Apollo RS50 DCC (Direct Computer Control) CMM (Coordinate Measuring Machine)ĭOE Office of Scientific and Technical Information (OSTI.GOV)
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