Payload and inertia are both important factors when designing End of Arm Tooling and selecting a robot. The differences between the two and how they affect choosing a robot is explained in this article. Payload is the weight the robot can lift. Payload includes the weight of the End of Arm Tooling (EOAT) and the weight of the product being picked. The payload is easier to measure and easier to calculate. Inertia is a property of matter where the object resists changes in velocity (speed and/or direction). Inertia is calculated using the mass of the End of Arm Tooling and product, the center of gravity of those items, and the distance from the robot face plate to the center of gravity. The inertia requires multiple measurements, calculations, and is unintuitive. As a result of the influence of inertia, just selecting a robot with a payload rating higher than your End of Arm Tooling and products’ weight is not enough for a successful system. It is possible for a robot to have an acceptable payload but the inertia of the End of Arm Tooling and product is too high. This can slow the robot, affecting cycle times or cause the robot to be unable to run. Imagine holding a rod with a wei...