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Author: Craig Shakarji

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1. On the Enduring Appeal of Least-squares Fitting in Computational Coordinate Metrology
Published: 9/6/2013
Authors: Vijay Srinivasan, Craig M Shakarji, Edward P Morse
Abstract: The vast majority of points collected with coordinate measuring machines are not used in isolation; rather, collections of these points are associated with geometric features through fitting routines. In manufacturing applications, there are two fund ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907559

2. Theory and Algorithms for Weighted Total Least-Squares Fitting of Lines, Planes, and Parallel Planes to Support Tolerancing Standards
Published: 8/16/2013
Authors: Craig M Shakarji, Vijay Srinivasan
Abstract: We present the theory and algorithms for fitting a line, 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912180

3. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911379

4. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909420

5. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905959

6. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900252

7. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=824707

8. Development of Tools for Measuring the Performance of Computer Assisted Orthopaedic Hip Surgery Systems
Published: 12/28/2007
Authors: Nicholas G Dagalakis, Yong Sik Kim, Daniel S Sawyer, Craig M Shakarji
Abstract: In the late seventies a sensor was invented, which could track the movement of athlete body parts.  In the early eighties an improved version of this sensor was introduced, by a group of NIST researchers, for the calibration and the performance ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=823612

9. NIST Medical Phantom Device to Assist With the Calibration and Performance Testing of CAOS Systems
Published: 11/9/2007
Authors: Nicholas G Dagalakis, James B Stiehl, Yong Sik Kim, Daniel S Sawyer, Craig M Shakarji
Abstract: According to expert othopaedic surgeons there is need for medical phantom devices with dimensional metrology traceable to national standards metrology organizations in order to confirm basic Computer Assisted Orthopaedic Surgery (CAOS) systems perfor ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=823625

10. Design and Fabrication of an Operating Room Computer Assisted Orthopaedic Hip Surgery Artifact
Published: 8/17/2007
Authors: Nicholas G Dagalakis, Yong Sik Kim, Daniel S Sawyer, Craig M Shakarji
Abstract: Hundreds of thousands of joint arthroplasty operations are performed throughout the world every year providing life saving relief from pain and return of mobility to the majority of the individuals who have this treatment. Clinical studies have show ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=823614



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  • SP 250-XX: Calibration Services
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