Gears are machine elements used to transmit rotary motion between two shafts, usually with a constant speed ratio.
0:00 Pinion and Gear
0:11 Pitch circle
0:45 Pitch Point
0:53 Base circle and Involute
1:06 Line of Action
1:42 Pressure Angle
1:58 Circular Pitch
2:28 Base Pitch
2:47 Center Distance
3:05 Addendum and Dedendum
3:21 Clearance
3:32 Whole Depth
3:38 Module
3:54 Face & Flank
