High-end robots require actuators with high torque and high precision. The popular choises are Harmonic Drives (strain wave) or Cycloidal Drives. Both offer compact reduction and low backlash, which makes them more suitable than regular spur gears or planatery gear sets. A newer and less popular option, for now, is the RV reducer. This combines the cycloidal drive with a set of spur gears to adres...