11. The system failed because of gear train breakage, causing a fatal accident in 2001. 12. Planetary gear trains provide high power density in comparison to standard parallel axis gear trains. 13. A differential gear train can be used to allow a difference between two input axles. 14. A planetary gear train establishes the mechanical gear ratios. 15. Planetary gear trains provide high power density in comparison to standard parallel axis gear trains . 16. This forms a planetary gear train with a fixed carrier train ratio " R =-1 ". 17. Of course, the gear trains were made accordingly. 18. Another advantage of the digital computer over the gear train is that it is more evolvable. 19. The escapement drives the pendulum, usually from a gear train , and is the part that ticks. 20. And certainly not spring-driven gear trains that could be used to build things like mechanical clocks.
