SPC techniques for the M-48 Coordinate Measurement Machine applied to uncertainty analysis and monitoring

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The Moore M-48 Coordinate Measuring Machine (CMM) is used to calibrate step gages, ball bars and hole plates. The expanded uncertainty (2 sigma) of the M-48 CMM was determined to be {+-}0.3 + 0.4 L microns (L is length in meters), using the decomposition method. The problem statement becomes, how does one monitor and control the calibration process to ensure that one maintains this level of reliability? Traditional methods of statistical process control, such as X-bar and R charts assume large lot production and are designed to detect changes in the process being monitored. Since calibrations are performed one at ... continued below

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6 p.

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Escher, R.N. Jr. April 14, 1998.

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  • Oak Ridge Y-12 Plant
    Publisher Info: Oak Ridge Y-12 Plant, TN (United States)
    Place of Publication: Tennessee

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The Moore M-48 Coordinate Measuring Machine (CMM) is used to calibrate step gages, ball bars and hole plates. The expanded uncertainty (2 sigma) of the M-48 CMM was determined to be {+-}0.3 + 0.4 L microns (L is length in meters), using the decomposition method. The problem statement becomes, how does one monitor and control the calibration process to ensure that one maintains this level of reliability? Traditional methods of statistical process control, such as X-bar and R charts assume large lot production and are designed to detect changes in the process being monitored. Since calibrations are performed one at a time, with sometimes years between calibrations, standard control charting methodology falls a bit short of what is needed to maintain process capability. Upon examination of the process uncertainty for the M-48 CMM the author finds the following parameters play an important roll in process capability. Since the M-48 uses laser scales, the Edlen equation is used to convert pressure, temperature and humidity to wavelength correction. The largest source of uncertainty comes from temperature effects based on gradients, accuracy of the thermistors and the actual coefficient of thermal expansion of the artifact. The probe calibration, which is performed for each calibration, is another important variable. Since the M-48 CMM`s movement is very slow, drift is also an important parameter to monitor. The paper describes the selection of check standards and measurement protocol made.

Physical Description

6 p.

Notes

OSTI as DE98057575

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  • National conference of standards laboratories (NCSL) 1998 workshop and symposium, Albuquerque, NM (United States), 19-23 Jul 1998

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  • Other: DE98057575
  • Report No.: Y/AMT--0541
  • Report No.: CONF-980721--
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 290903
  • Archival Resource Key: ark:/67531/metadc674575

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  • April 14, 1998

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • April 8, 2016, 5:53 p.m.

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Escher, R.N. Jr. SPC techniques for the M-48 Coordinate Measurement Machine applied to uncertainty analysis and monitoring, article, April 14, 1998; Tennessee. (digital.library.unt.edu/ark:/67531/metadc674575/: accessed October 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.