This document contains figures and diagrams related to spur gears and helical gears. Spur gears have straight teeth that engage in parallel lines of contact while helical gears have teeth that are cut or formed in a helix on the surface of a cylinder or cone. The document explores the design and operation of these gear types through multiple diagrams and illustrations.

1. UNIT-II
SPUR GEAR AND HELICAL GEARS

2. Fig. 14.1

3. Fig. 14.2

4. Fig. 14.3

5. Fig. 14.4

6. Fig. 14.5

7. Fig. 14.6

8. Fig. 14.7

9. Fig. 14.8

10. Fig. 14.9

11. Fig. 14.10

12. Fig. 14.11

13. Fig. 14.12

14. Fig. 14.13

15. Fig. 14.14

16. Fig. 14.15

17. Fig. 14.16

18. Fig. 14.17

19. Fig. 14.20

20. Fig. 14.21

21. Fig. 14.24

22. Fig. 14.25

23. Fig. 14.26

24. Fig. 14.27

25. Fig. 14.28