The origin of the World Frame is typically designated as the intersection of the center of the robot base with a plane level to the joint 2 motor.

• A. False
• B. True
• C. Not enough information
• D. Only during initial setup

Answer: (B)

World frames provide a fixed reference in space for all robot moves, so choosing a stable origin is essential. In FANUC practice, the origin is commonly set at the intersection of the robot base’s center with a plane that is level with the axis of the second joint. This ties the world frame to a physically stable point on the robot and aligns its horizontal plane with the arm’s primary motion plane. As a result, world coordinates map to joint movements in a predictable, intuitive way, and calibration or matching to real space stays consistent as the arm moves. If the origin were placed somewhere else, you’d introduce more complex transformations to relate world coordinates to the arm’s joints, making programming and alignment less straightforward. The world frame is not something that only exists during initial setup; it remains a fixed reference during operation, which is why this description matches the typical convention.