Fig. 1. On-machine measurement system with ultra-precision lathe as platform

Fig. 2. Probe calibration by standard ball of ultra-precision lathe

Fig. 3. Probe calibration by standard ball of GPI 1240 contourgraph

Fig. 4. Sampling principle of data screening method based on equal chord height

Fig. 5. Schematic diagram of structural dimension of on-machine measurement system

Fig. 6. Surface error comparison of dome with high gradient before and after compensation machining

Fig. 7. Measurement site of coaxiality

Fig. 8. Measurement results of coaxiality

Fig. 9. Centrometer confirmatory measurement

Fig. 10. Measurement results of thin-walled dome with high gradient