It's hard not to think of a robot as a person-a fast, accurate, tireless person. Nonetheless, equating the abilities of robots and human beings is risky. What's easy for a human assembler can be difficult or impossible for a robot. To ensure success with robotic assembly, engineers must adapt their parts, products and processes to the unique requirements of the robot.
For example, unlike human assemblers, robots cannot hold a part in one hand and a tool in the other. Rather, SCARA and Cartesian robots are "one-handed" and can only move along three or four axes. As a result, products should be designed so they can be assembled in layers from the bottom up.