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<p>When using a ballbar to measure the geometric errors of the rotary axis in a CNC machine tool, the distribution of the ball center positions of the magnetic ball socket significantly influences the identification accuracy during the testing process. To investigate this phenomenon, taking a five-axis machining center as an example, a mathematical model correlating the six geometric errors of the rotary axis and the deviation of the ball center of the magnetic ball socket was established using homogeneous transformation matrices. The effect of the distribution of the ball center positions of the ball socket on the A-axis, and the sensitivity of measurement errors associated with the ball center coordinates on the identification accuracy of the six geometric errors, are systematically investigated during the error identification process. Subsequently, the optimal distribution scheme for the ball center positions is proposed improve the identification accuracy for the geometric errors of the rotary axis. This study provides an important theoretical basis for properly installing the ball center of the magnetic ball socket when measuring the geometric errors of the rotary axis in CNC machine tool.</p>

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Influence of the center position distribution of ballbar on identification accuracy of geometric errors for the rotary axis of CNC machine tool

  • 期刊论文

  • 发表日期：

    2026年7月31日

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  • Shuwen Lin,
  • Zhe Lu,
  • Jianxiong Chen,
  • Zhiwei Huang,
  • Tianqi Gu,
  • Yu Xie

摘要

When using a ballbar to measure the geometric errors of the rotary axis in a CNC machine tool, the distribution of the ball center positions of the magnetic ball socket significantly influences the identification accuracy during the testing process. To investigate this phenomenon, taking a five-axis machining center as an example, a mathematical model correlating the six geometric errors of the rotary axis and the deviation of the ball center of the magnetic ball socket was established using homogeneous transformation matrices. The effect of the distribution of the ball center positions of the ball socket on the A-axis, and the sensitivity of measurement errors associated with the ball center coordinates on the identification accuracy of the six geometric errors, are systematically investigated during the error identification process. Subsequently, the optimal distribution scheme for the ball center positions is proposed improve the identification accuracy for the geometric errors of the rotary axis. This study provides an important theoretical basis for properly installing the ball center of the magnetic ball socket when measuring the geometric errors of the rotary axis in CNC machine tool.