1. Mesh Kinematics of a Spur Gear Pair
Spur gear mesh action
Peripheral velocity ratio V1 / V2
Line of action v2 vr
vt2 v1
vt1
Pitch line vs vn

2. Planetary Gears Normal Operation Relative to Carrier With Carrier
The motion of any PGT is analyzed in two steps
carrier
sun
planet
ring
Relative to carrier
With carrier
Absolute velocity of gears

3. Ordinary Gear Trains Parallel Axis Gears Spur Gear Helical Gear
Internal Gear
Cross Axis Gears
Bevel Gear
Worm Gear
Face-Gears

4. Bearing types Cylindrical Roller Tapered Roller Ball bearing
Spherical bearing
Thrust Bearing