| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a retention mechanism of measurement ball for enabling measurement with high accuracy in short time upon measuring a geometrical error of a machine tool using a ball bar for evaluating geometrical errors. <P>SOLUTION: A centering bar 21 includes a spherical part 23 provided at a proximal end of a shaft part 22 and inserted into a hole 10. A centering bar holding member 11 is inserted through a distal end of a tool holder 5. In this state, a lid member 12 is engaged with the distal end of the tool holder 5 such that the centering bar 21 is held in the hole 10 to maintain a center of the spherical part 23 at a certain position. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
