Support vector regression for determining the minimum zone sphericity

Poornima Balakrishna, Shivakumar Raman*, Theodore B. Trafalis, Budi Santosa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


Several methods have been investigated to determine the deviation of manufactured spherical parts from ideal geometry. One of the most popular is the least squares technique, which is still widely employed in coordinate measuring machines used by industries. The least squares algorithm is optimal under the assumption that the data set is very large and has the inherent disadvantage of overestimating the minimum tolerance zone, resulting sometimes in the rejection of good parts. In addition, it requires that the data be distributed normally. The support vector regression approach alleviates the necessity for these assumptions. While most fitting algorithms in practice today require that the sampled data accurately represent the surface being inspected, support vector regression provides a generalization over the surface. We describe how the concepts of support vector regression can be applied to the determination of tolerance zones of nonlinear surfaces; to demonstrate the unique potential of support vector machine algorithms in the area of coordinate metrology. In specific, we address part quality inspection of spherical geometries.

Original languageEnglish
Pages (from-to)916-923
Number of pages8
JournalInternational Journal of Advanced Manufacturing Technology
Issue number9-10
Publication statusPublished - Jan 2008
Externally publishedYes


  • Coordinate metrology
  • Minimum zone spherical tolerance
  • Radial basis kernel function
  • Support vector regression


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