Generation method of cutting tool paths for high-speed and high-quality machining of free-form surfaces

Yuki Takanashi, Hideki Aoyama, Song Cheol Won

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


In general, NC programs for machining free-form surfaces using a computer numerical control (CNC) machine tool are generated using a computer-aided manufacturing (CAM) system. The tool paths (CL data) generated by a CAM system are approximated straight-line segments based on tolerance (allowable error). As a result, the tolerance affects the machining accuracy and time. If the tolerance is set to a small value, the lengths of the segments are shortened, and the machining accuracy is improved. The process in which a CNC machine tool reads and analyzes an NC program and controls the motors requires a mini-mum processing time of an NC program block (block-processing time). Therefore, if the lengths of the approximated straight-line segments are too small, it will be impossible to reach the indicated feed speed, and the machining time will be longer. In this study, by identifying the block-processing time of a CNC con-troller and deriving the appropriate length of the approximated straight-line segment based on the block-processing time, a CL data creation method that is ca-pable of high-speed and high-accuracy free-form surface machining is proposed. In addition, experimental verification tests of the method are conducted.

Original languageEnglish
Pages (from-to)521-528
Number of pages8
JournalInternational Journal of Automation Technology
Issue number4
Publication statusPublished - 2021 Jul 1


  • Accelera-tion/deceleration
  • CAM system
  • CNC machine tool
  • Free form surface
  • High speed and high accuracy machining

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering


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