In this study, parallelism errors between the spindle axis and the linear axis of machine tools were measured using a double ball-bar. Specifically, two circular tests were performed to measure the parallelism errors using tool balls with different tool lengths and a workpiece ball fixed to a workpiece table. Parallelism errors were calculated by analyzing, simultaneously, the measured double ball-bar (DBB) data from the circular tests. The proposed method provides accurate measurements due to a large offset between the circular tests within the working space of machine tools. Additionally, the approach only requires a DBB and adjustment/extension fixtures; thus, it simplifies measurements and is cost-effective.
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Lee, K., Shin, D. & Yang, S. Parallelism error measurement for the spindle axis of machine tools by two circular tests with different tool lengths. Int J Adv Manuf Technol 88, 2883–2887 (2017). https://doi.org/10.1007/s00170-016-8999-0
- Circular test
- Double ball-bar
- Machine tools
- Parallelism errors
- Spindle axis