MTC project solves robotic accuracy problem

Metrology and a real-time controller enables robot to follow complex paths with an extreme degree of accuracy

Researchers at the Manufacturing Technology Centre have used metrology for the first time to deliver ultra-accurate robotic automation.

The Metrology Assisted Robotic Automation (MARA) project at the Coventry-based MTC has solved a longstanding manufacturing problem with robotic accuracy, and will result in major improvements in the precision and consistency of robotic operations, according to the researchers.

The MTC project combined a high-speed robot, ultra-accurate laser tracker which can make real time corrections to the robot’s path during a process – something which has never been achieved before. The result is accuracy of better than 0.2mm for a robot working at a speed of 5mm a second.

MTC project leader Richard Kingston said: “By combining the robot, the laser metrology device and a real-time controller we were able to ensure that the robot could follow complex paths with an extreme degree of accuracy not previously achievable.

"The project has proved that it is possible to correct a robot’s path in real time, which is another first. We are now continuing our work to improve accuracy and reliability still further, but this is a fantastic result.”

The MTC project used a Kuka KR240 robot with a Kuka robot controller, integrated with a Leica AT901 laser tracker as a metrology feedback device, and a National Instruments real-time controller.

The MTC aims to provide a competitive environment to bridge the gap between university-based research and the development of innovative manufacturing solutions. The MTC is part of the High Value Manufacturing Catapult, supported by Innovate UK.