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Displaying records 11 to 20 of 33 records.
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11. Metrological Challenges Introduced by New Tolerancing Standards
Published: 7/5/2013
Authors: Edward P Morse, Yue Peng, Vijay Srinivasan, Craig M Shakarji
Abstract: The recent release of ISO 14405-1 has provided designers with a richer set of specification tools for the size of part features, so that various functional requirements can be captured with greater fidelity. However, these tools also bring new challe ...

12. Fitting Weighted Total Least-Squares Planes and Parallel Planes to Support Tolerancing Standards
Published: 10/19/2012
Authors: Craig M Shakarji, Vijay Srinivasan
Abstract: We present elegant algorithms for fitting a plane, two parallel planes (corresponding to a slot or a slab) or many parallel planes in a total (orthogonal) least-squares sense to coordinate data that is weighted. Each of these problems is reduced to a ...

13. Performing three dimensional measurements on micro-scale features using a flexible CMM fiber probe with ellipsoidal tip
Published: 1/5/2012
Authors: Balasubramanian Muralikrishnan, Jack A Stone Jr., Craig M Shakarji, John Richard Stoup
Abstract: The tip of a traditional CMM probe used for measurements of macro-scale artifacts is generally a sphere of excellent geometry. Its known diameter (from a prior calibration) and form along with the known approach direction (which is normal to the surf ...

14. Application Software
Published: 7/22/2011
Author: Craig M Shakarji

15. The NIST 66 m Ball Range A One Dimensional Artifact to test Three Dimensional Imaging Systems
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7725
Published: 11/3/2010
Authors: Bruce R. Borchardt, Craig M Shakarji
Abstract: NIST (the National Institute of Standards and Technology) has instituted a 66 m long range for testing of distance-measuring systems. The range consists of titanium balls mounted along a line on stands at unequal intervals. This paper describes thi ...

16. Choosing test positions for laser tracker evaluation and future Standards development
Published: 7/15/2010
Authors: Balasubramanian Muralikrishnan, Daniel S Sawyer, Christopher J Blackburn, Steven David Phillips, Craig M Shakarji, Ed Morse, Robert Bridges
Abstract: A working group within the ISO TC 213 committee is developing a draft document [11] for evaluating the performance of laser trackers. The ASME B89.4.19 Standard [1] and the draft VDI/VDE 2617 part 10 [2] describe some useful tests that are incorporat ...

17. RECIST vs. Volume Measurement in Medical CT Using Ellipsoids of Known Size
Published: 4/12/2010
Authors: Zachary H Levine, Bruce R. Borchardt, Nolan J Brandenburg, Charles W Clark, Balasubramanian Muralikrishnan, Craig M Shakarji, Joseph J. Chen, Eliot L. Siegel
Abstract: (a) Purpose: We wanted to test the extent to which two common methods of determining the sizes of tumors would perform when compared to a statistically significant number of well-characterized reference objects. The size of the objects was chosen to ...

18. Dimensional Metrology Issues of Army Body Armor Testing
Series: OTHER
Published: 2/18/2010
Authors: Kirk D Rice, Michael A Riley, Amanda Lattam Forster, Steven David Phillips, Craig M Shakarji, Daniel S Sawyer, Christopher J Blackburn, Bruce R. Borchardt, James J Filliben

19. Dimensional measurement traceability of 3D imaging data
Published: 1/19/2009
Authors: Steven David Phillips, Craig M Shakarji, Michael Krystek, K Summerhays
Abstract: This paper discusses the concept of metrological traceability to the SI unit of length, the meter. We describe how metrological traceability is realized, give a recent example of the standardization of laser trackers, and discuss progress and challe ...

20. Calibration of a Computer Assisted Orthopedic Hip Surgery Phantom
Published: 11/4/2008
Authors: Daniel S Sawyer, Nicholas G Dagalakis, Craig M Shakarji, Yong Sik Kim
Abstract: Orthopedic surgeons have identified a need for calibration artifacts (phantoms) to establish the traceability (to the SI unit of length) of measurements performed with Computer Assisted Orthopedic Surgery (CAOS) systems. These phantoms must be light ...

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