Ø  Involute unwinding a string on circle

§   http://demonstrations.wolfram.com/CircleInvolute/

§   https://www.bing.com/videos/search?q=involute+generation&&view=detail&mid=CC9FA625E7AFB6247F08CC9FA625E7AFB6247F08&&FORM=VRDGAR

Ø  SPUR Gear with Rack (Straight line contact)

§   http://demonstrations.wolfram.com/MechanicalInvoluteGears/

Ø  SPUR Gear with SPUR Gear (Straight line contact parallel to axis)

Ø  Worm and Worm Wheel (Hobbing)

§   https://www.bing.com/videos/search?q=worm+and+worm+wheel&&view=detail&mid=26228C61490E3FFC921526228C61490E3FFC9215&rvsmid=64C93A0A17AA7B32AC1264C93A0A17AA7B32AC12&FORM=VDQVAP

Ø  Helical Gear with SPUR Gear (Gear tooth Sliding! Shaving!)

§   https://www.bing.com/images/search?view=detailV2&ccid=9Nokc6CF&id=EBB5DD32320358E538E3F9E27DE2364059970420&thid=OIP.9Nokc6CFumqdJQgW_rm_rgHaFO&mediaurl=http%3a%2f%2fraclgeartech.com%2fimages%2fshaving-section2.jpg&exph=210&expw=298&q=Gear+Shaving+Machines&simid=608054937993940055&selectedIndex=6&ajaxhist=0

Ø  Helical Gear with Helical Gear Non-parallel axes (Sliding! Shaving!)

§   https://www.youtube.com/watch?v=kQnkWYZs1II

Ø  Helical Gear with Helical Gear Parallel axis (no sliding, straight line contact or a curved line!)

§   https://www.youtube.com/watch?v=sZeXJFd-G2M

Ø  Straight Bevel Gear with a flat circular rack (Heidenreich method of generation)

§   https://www.geartechnology.com/issues/0615/images/bgt86.jpg
https://www.bing.com/videos/search?q=bevel+grear&&view=detail&mid=563084B6B34CD50C6398563084B6B34CD50C6398&&FORM=VRDGAR

Ø  Straight Bevel Gear with conical worm! (Have you seen?)How it would look
Feeder Screw or varying pitch hob

Ø  Hyperboloid generation

§   http://demonstrations.wolfram.com/HyperboloidAsARuledSurface/

Ø  Hyperboloid with Hyperboloid (is there tooth sliding?)

§   http://otvinta.com/

§   http://modellsammlung.uni-goettingen.de/index.php?lang=en&r=1&sr=5&m=61

Ø  Hyperboloids cut into half (Are they skew bevel gears?)

§   http://www.pan-ol.lublin.pl/wydawnictwa/TMot9/Gribanov.pdf

Ø  Spiral Bevel gear with Straight bevel gear!

Ø  Spiral Bevel Gear with Conical Worm (Klingelnberg hob!)

Ø  Skew Bevel gears and worms

Ø  How Generate involute of circular arc crown teeth (offset-skew bevel gears) and pinion

https://www.geartechnology.com/issues/0615/images/bgt87.jpg
https://www.geartechnology.com/articles/0615/The_Basics_of_Gear_Theory/

§  https://www.bing.com/videos/search?q=bevel+grear&&view=detail&mid=7838069DD590179CC3DE7838069DD590179CC3DE&&FORM=VDRVRV

Some interesting and impossible geometrical videos