Abstract
To clarify the point to note in measuring geometrical deviation of five axis MC by simultaneously three axis movement using the double ball bar, we carry out following evaluation. 1. Reproducibility of measurement. 2. Reproducibility of alignment accuracy between the center of ball on the spindle side and center of C axis. 3. The influence of C-axis rotation to the alignment accuracy. 4. The influence of range of measurement angle on the calculated value of track center. As a result the notes to be considered in measuring are made clear. The factor of influence to the measurement precision is shown, and the note to high accuracy measurement is examined.
