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CYLINDRICAL DATUM EVALUATION METHODS UNDER MAXIMUM AND LEAST MATERIAL CONDITION SPECIFICATION

TUREK, STEVEN

Abstract Details

2006, MS, University of Cincinnati, Engineering : Mechanical Engineering.
Modern design and manufacturing requires that a manufactured component be compared to the design specifications through adequate dimensions and tolerances. Often the validation process is electronic, requiring that discretely sampled data be geometrically evaluated; nowhere is this more critical then when assessing a datum. Datums serve as a reference for all measurements, and the establishment of datums directly influences the likelihood of part validation. When a cylindrical datum feature is specified at maximum material condition (MMC) or least material condition (LMC) a unique circumstance arises: a virtual condition (VC) cylindrical boundary must be defined based on the sampled data [1]. The geometric relationship between the cylindrical data cluster obtained from inspection equipment and a VC cylinder has not been specifically addressed in previous research. This research focuses on datum evaluation of cylindrical features specified at LMC or MMC. Three novel approaches to this geometric analysis are presented, analyzed, and validated in this study. Two of the proposed methods are new interpretations of established methods applied to this unique geometric circumstance: least squares and maximum inscribing cylinder or minimum circumscribing cylinder. The third method utilizes computational geometry to reconstruct the sampled surface for analysis. Each of the proposed methods utilizes a different amount of sampled data, leading to differing levels of sensitivity to sample size and error. The three methods were applied to different cylindrical forms, utilizing various sampling techniques and sample sizes. Trends across sample size were analyzed to assess the variation in axial orientation when compared to the true form, comprised of ten thousand data points. Two relevant case studies explore the applicability of the methods in real world application, and this study concludes with recommendations for applications and possible avenues of future research.
Dr. Sam Anand (Advisor)
76 p.

Recommended Citations

Citations

  • TUREK, S. (2006). CYLINDRICAL DATUM EVALUATION METHODS UNDER MAXIMUM AND LEAST MATERIAL CONDITION SPECIFICATION [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1163778626

    APA Style (7th edition)

  • TUREK, STEVEN. CYLINDRICAL DATUM EVALUATION METHODS UNDER MAXIMUM AND LEAST MATERIAL CONDITION SPECIFICATION. 2006. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1163778626.

    MLA Style (8th edition)

  • TUREK, STEVEN. "CYLINDRICAL DATUM EVALUATION METHODS UNDER MAXIMUM AND LEAST MATERIAL CONDITION SPECIFICATION." Master's thesis, University of Cincinnati, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1163778626

    Chicago Manual of Style (17th edition)