Fig. 1. Measurement principle of ZC worm tooth profile

Fig. 2. Coordinate system for grinding worm with grinding wheels

Fig. 3. Tooth profile measuring error

Fig. 4. Measurement error curves of tooth profile shape

Fig. 5. Influence of number of worm threads

Fig. 6. Influence of worm module

Fig. 7. Influence of pitch circle diameter

Fig. 8. Measured worm

Fig. 9. Profile deviation curves before correction

Fig. 10. Comparison of tooth profile deviation curves before and after correction

Fig. 11. Comparison of tooth profile deviation results