The video references are many, they will all appear at the end of Part 2.
But to save those without digital editions the trouble of typing them all in here they are.
Hope that’s useful,
Neil
video 1: power transmission between two shafts: http://www.youtube.com/watch?v=3aUxtC8InGI
video 2: the bad gear set: http://www.youtube.com/watch?v=7iarf0dAkhc
video 3: involute generation from pulleys and belt: http://www.youtube.com/watch?v=lWuKl4rG2HA
video 4: multi teeth gear set: http://www.youtube.com/watch?v=SeyQXIB7XRc
video 5: involute and rack: http://www.youtube.com/watch?v=bjefeKF7Rxs
video 6: involute curve mechanical behavior: http://www.youtube.com/watch?v=nlgNmnHB30s
If you want to see others of my videos, go to my video chain: https://www.youtube.com/user/jacquesmaurel/videos
An interesting website on the subject:
https://www.tec-science.com/category/mechanical-power-transmission/involute-gear/