Low-cost precision rotary index calibration

T. W. Ng, T. S. Lim

Research output: Contribution to journalConference articleOther

3 Citations (Scopus)


The traditional method for calibrating angular indexing repeatability of rotary axes on machine tools and measuring equipment is with a precision polygon (usually 12 sided) and an autocollimator or angular interferometer. Such a setup is typically expensive. Here, we propose a far more cost-effective approach that uses just a laser, diffractive optical element, and CCD camera. We show that significantly high accuracies can be achieved for angular index calibration.

Original languageEnglish
Article number58790C
Pages (from-to)1-8
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 29 Dec 2005
Externally publishedYes
EventRecent Developments in Traceable Dimensional Measurements III - San Diego, United States of America
Duration: 31 Jul 20051 Aug 2005


  • Angular rotation
  • Machine tools
  • Precision measurements
  • Rotary indexers

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