Fig. 1. Schematic of crystal axis angle

Fig. 2. Schematic of diamond cutting principle

Fig. 3. Program block diagram of crystal axis angle error adjustment

Fig. 4. Principle of in-situ measuring of crystal axis angle error

Fig. 5. Data processing

Fig. 6. In-situ drift

Fig. 7. Sucker angle adjustment tool. (a) Physical photograph; (b) operating interface; (c) error of different adjustment values; (d) home error

Fig. 8. Crystal axis correction procedure

Fig. 9. In-situ testing results of crystal surface of sample 1#. (a) Before cutting; (b) after cutting

Fig. 10. Angle between two surfaces of sample 1# after correction

Fig. 11. Test result of sample 1#

Fig. 12. Relationship between calibration error and element aperture