Deceiving the V-Block Method for Assessment of Departure From Roundness

Christopher Sangwin

Research output: Contribution to journalArticlepeer-review


The purpose of this paper is to construct non-circular shapes via pure geometry which are indistinguishable from a perfect circle according to the results of applying so-called V-block tests. We mean that the geometry of the curve is such that the test will, from a purely theoretical point of view, apparently show no departure from roundness whatsoever. In doing so, we call into question the theoretical basis for these practical V-block tests.
Original languageEnglish
Pages (from-to)521-532
JournalInternational Journal of Computational Geometry & Applications
Issue number6
Publication statusPublished - 1 Jan 2009


  • V-block methods
  • Assessment of roundness
  • computational metrology


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