On the development of CMM inspection technology for parts without regular features

Jiing Yih Lai, Kuo Jen Chen

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Many industrial parts are designed with freeform features only. Some may have regular features, but their shape may deform during the manufacturing process, resulting in no feature to act as the datum for inspection. The objective of this study is to propose an integrated approach for three-dimensional inspection of such products. The proposed approach mainly includes three phases, iterative part localization, measurement path planning and error comparison. A rough positioning stage and a fine positioning stage are combined to establish the part coordinate, which is as close to the model coordinate as possible. A path planning system is then developed to plan the measurement path based on the CAD model. The error comparison includes: point-to-point comparison, point-to-CAD comparison without alignment and with alignment. A standard sphere and a gauge block are used for the verification of the proposed part localization. A golf head example is presented also to demonstrate the integrated process of the proposed approach.

Original languageEnglish
Pages (from-to)385-396
Number of pages12
JournalJournal of the Chinese Society of Mechanical Engineers, Transactions of the Chinese Institute of Engineers, Series C/Chung-Kuo Chi Hsueh Kung Ch'eng Hsuebo Pao
Issue number4
StatePublished - Aug 2007


  • CMM inspection
  • Error comparison
  • Localization


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