1. Types of Gears
   1. spur gears
   2. crown gears
   3. worm gears
   4. clutch gears
   5. cam gears - for multi-tasking motors
2. Simple Transmission System
   1. idler gears
   2. ratchers
   3. differential gears
3. Concepts
   1. . . .
   2. Input vs. output shaft
   3. Circular vs. linear motions
   4. Friction: pros and cons
   5. weight distribution
   6. Balance
4. Structure
   1. Interlocking
   2. Cross bracing - Triangular vs Rectangular
   3. System vs. Sub-system
   4. End Effector
      1. . . .
      2. Gripper with locking
      3. Gripper without locking
      4. Mobile Sensor mount
   5. Structurally sound chassis (experience level)
   6. Universal adaptor sub-assembly (experience level)
   7. Structurally sound chassis (design level)
   8. Universal adaptor sub-assembly (design level)