Real-time variable feedrate parametric interpolator for CNC machining

Chung-Wei Cheng, Mi Ching Tsai, Ming Yang Cheng

Research output: Contribution to journalConference article

4 Scopus citations


This study explores the feasibility of variable feedrate parametric interpolators for real-time motion command generation using a digital signal processor (DSP). Most of the existing parametric interpolators are developed for a constant federate due to the computational complexity. However in certain applications, in order reduce the deterioration in accuracy of machining, feedrate commands should be performed in advance to overcome excessive acceleration/deceleration of CNC machines. The aim of this study is to develop a real-time parametric interpolator with variable federate where acceleration/deceleration planning on the feedrate command is performed before the interpolation takes place. This approach that would provide new capabilities for advanced CAD/CAM systems, can compensate for the path command error caused by the acceleration/deceleration after interpolation. To justify the performance of the real-time control interpolator, an X-Y table driven by two servomotors is controlled to track a parametric curve represented in non-uniform rational B-Spline (NURBS) form.

Original languageEnglish
Pages (from-to)109-114
Number of pages6
JournalIFAC Proceedings Volumes (IFAC-PapersOnline)
Issue number1
StatePublished - 1 Jan 2002
Event15th World Congress of the International Federation of Automatic Control, 2002 - Barcelona, Spain
Duration: 21 Jul 200226 Jul 2002


  • Digital signal processor
  • Parametric interpolator

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