Center of gravity testing in robotics requires precision load cells

As the use of robots increases across all industries and the types of robot movements become more complex, advanced testing with quality measurement solutions is essential. Touch impulse and rough measurements of indicators are not sufficient for sophisticated robotics. There Robots and cobots have to perform fluid and sluggish movements, control and feedback require maximum feedback and resolution.

Determining the center of gravity for robot actions and applications is a crucial factor in the analysis of inertia, load transfer, and interaction. The center of gravity of a robot system is a critical factor for its stability and performance.

The CoG is the point at which the entire weight of the system is evenly distributed. If the CoG is not placed correctly, the system may be unstable and at risk of tipping, which could result in damage to the robot.

In any robot application that utilizes advanced mobility features, the center of gravity can influence how the system moves. It can also affect the accuracy of the movements. Therefore, it is important to use high-precision measurement solutions. See: Advances in robotics and cobots with interface sensors.

Why robotics engineers care about CoG testing

• Stability: The CoG is an important factor in determining the stability of a robot. If the CoG is not placed correctly, the robot may be unstable and at risk of tipping. This can pose a safety risk and can also damage the robot. Not checking stability before proceeding with construction is a costly mistake.
• Performance: The CoG can also influence a robot's performance. If the CoG is too high, the robot may be less maneuverable. If the CoG is set too low, the robot may be less stable. By optimizing the CoG, robot engineers can improve the robot's performance and use it for actions where precise movements are important.
• Security: In some industries, e.g. B. in the manufacturing industry, medical technology and aerospace, there are safety regulations that require robots to have a certain CoG value. In the automotive industry, for example, robots used to weld cars must have a CoG value that is below a certain value. By testing the CoG of their robots, robotics engineers can ensure they are compliant with safety regulations.

There are various methods for determining the CoG of a robotic system. A common method is to use strain gauge load cells. Not all load cells are designed for precision measurements. Interface specializes in precision. Testing the center of gravity requires accurate measurement. For example, Interface's compression load cells are often used for gravity testing in robotics because they are very accurate and can measure remarkably small forces.

Load cells at the interface measure force and can be used to determine the weight of a system at various points. By measuring the weight of a system at different points, it is possible to calculate the location of the CoG.

Load cells used for gravity testing typically fall into our miniature load cell range due to the size of the installation and testing environment. Miniature load cells are easy to incorporate into robotics and can be used for continuous monitoring.

Haptic force and CoG in surgical robots

Robots used in surgery often use haptic force feedback to ensure that the surgeon does not use too much force, causing harm or increased stress to the patient. Haptics is the use of force, vibration, or other tactile stimuli to create the sensation of touch. In the context of invasive procedures, haptic force feedback is used by robots to provide the surgeon with feedback about the forces he is exerting on the patient's tissue. CoG testing can help prevent the robotic arm from tipping over during surgery.

CoG testing is important for haptic force feedback in invasive surgery because it ensures that the robotic arm is stable and does not tip over during surgery. The CoG is the point where the entire weight of the robot arm is evenly distributed. If the CoG is not positioned correctly, the robot arm may be unstable and tip over. This can pose a safety risk for the surgeon and the patient.

CoG testing is also used to optimize the design of the robotic arm for haptic force feedback. CoG testing with precision load cells can verify the performance of the robot arm in haptic force feedback applications. After the robotic arm is designed and optimized, CoG can ensure that the robotic arm gives the surgeon the feedback they need to perform a safe and accurate operation.

Robot focus in the production line

A company is developing a new robotic arm designed to simulate human behavior on a production line. The robotic arm is used to pick and place products, and it is important that the arm is stable and does not tip over. To ensure the stability of the robot arm, the company needs to determine the CoG of the arm. The load cell is attached to the arm and the arm is moved through a series of movements. The load cell data is used to calculate the arm's CoG.

CoG testing and multi-axis sensors

Multi-axis load cells are increasingly used for robot testing to provide data across 2, 3 or 6 axes at a given time. These highly functional sensors are ideal for robotic testing that simulates human behavior. You can find more information on this in Using Multi-Axis Sensors to Bring Robotics to Life.

To perform CoG (cognitive center of gravity) testing with precision load cells, a robotic system can be placed on a platform supported by the load cells. We call these load plates. The load cells measure the weight of the system at various points, and the data is then used to calculate the CoG position. For more information about load plates and multi-axis sensors, see our application note on the 6-axis load plate robot arm.