Fiducial-aided on-machine positioning method for precision manufacturing of optical freeform surfaces

Shixiang Wang, Chifai Cheung (Corresponding Author), Mingjun Ren, Mingyu Liu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

11 Citations (Scopus)


There are still significant challenges in accurate positioning of optical freeform surfaces on the machine tool and the measurement instrument, due to the high accuracy requirement and their complex shapes. This paper proposes a fiducial-aided on-machine positioning method (FAOPM) that combines the on-machine measurement and off-machine measurement to precisely position optical freeform surfaces during the precision manufacturing cycle including rough machining, fine machining, measurement, and error compensation. The FAOPM makes use of fiducials, which are firstly measured in coordinate measuring machine with nanometric accuracy to generate a fiducial-aided computer aided design (FA-CAD) of the designed optical surface, then the developed on-machine measuring device obtains the accurate positions of the fiducials after remounting in the machining coordinate system. Finally, the relative position of the workpiece is identified so that the associated cutting paths and compensation tool path can be easily generated. Several optical freeform surfaces were experimentally machined to prove the capability of the proposed method. The results indicate that the positions of the workpiece during the precision manufacturing and measurement cycle were precisely achieved and the form accuracy of the optical freeform surfaces was remarkable improved based on the FAOPM.

Original languageEnglish
Pages (from-to)18928-18943
Number of pages16
JournalOptics Express
Issue number15
Publication statusPublished - 23 Jul 2018

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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