A Study on the Ball-Bar Artifact for the Volumetric Error Calibration of Machine Tools

Machine Tools 공간오차 분석을 위한 Bal1-bar Artifact 연구

  • 이응석 (충북대학교 대학원 기계공학부) ;
  • 구상서 (충북대학교 대학원 기계공학) ;
  • 박달근 (충북대학교 기계공학부)
  • Published : 2004.07.01


For volumetric error measurement and calibration for machine tools, manufacturing machine or coordinate measuring machine (CMM), are studied using a Ball-bar artifact. A design of the Ball-bar is suggested manufactured by Invar, which is a low thermal expansion material, and precision steel balls. The uncertainty for the artifact method is discussed. A method of the Ball-bar artifact for obtaining 3-D position errors in CMM is proposed. The method of error vector measurement is shown using the Ball-bar artifact. Finally, the volumetric error is calculated from the error vectors and it can be used for Pitch error compensation in conventional NC machine and 3-D position Error map for calibration of NC machine tools.


Volumetric Error;CMM;Artifact;Ball-Bar;Machine Tool


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