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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

Abstract

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.

Keywords

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

References

  1. Zhang, G. 1985, 'Error Compensation of Coordinate Measuring Machines,' Annals of the CIRP, Vol. 34/1
  2. Si Tae Won, 2001, 'The Effects of the Annealing Heat Treatments on the Mechanical Properties of the 1nvar Materials,' KSPE. Vol. 18, No.1, pp. 129-138
  3. British Standard, 1989, BS 6808 Part 3 : Coordinate Measuring Machines
  4. E.S.Lee, 1993, Computer Aided Volumetric Error Calibration of CNC-Machines and Coordinate Measuring Machines by the Artifact Method, Ph.D thesis, UMIST
  5. E.S.Lee and M. Burdekin, 2001, 'A Hole Plate Artifact Design for the Volumetric Error Calibration of CMM,' Int. J. Adv. Manuf Technol. (U.K), Spring-Verlag, Vol. 17, No.7, pp. 508-515 https://doi.org/10.1007/s001700170151