Nabtesco & KEBA in precision cooperation

That gear effects can strongly influence robot path accuracy is well-known; Nabtesco and KEBA have been researching this phenomenon for many years – so far independently of one another. While Nabtesco steadily increases the precision of gears, KEBA continuously improves the software models compensating robot inaccuracies. Identifying the relevant parameters, however, is a painstaking process, due to lack of transparency. This has now resulted in the two international technology experts working together on the vision of creating the world’s most precise robot. The goal is the purposeful integration of gearbox-specific data and characteristics – directly from the manufacturer – into the robot controller.

Software instead of sensors

The software-based solution is reported to offer numerous advantages over smart sensors, including lower costs, reduced system complexity, and improved data quality. Another aspect is that not all data can be detected by means of external sensors. This applies for example to rigidity – and of course to empirical values from development. That is why Nabtesco conducts numerous tests before introducing a gearbox on the market, to learn exactly how the gearbox will behave as a result of wear or exposure to the effects of temperature and lubricants. All of these parameters are included in the development of the KEBA control system.

Upgrade for the robot controller

By bundling their know-how and combining gear technology with digital services, Nabtesco and KEBA are able to create a unique solution that is unequalled in the history of robotics. Two stages are planned: a Nabtesco add-on with generalised data of a particular gearbox model, and an additional upgrade for even higher precision with the specific data of the gearboxes ultimately to be installed. Currently the project is in the test phase. A first pioneer application will be implemented in cooperation with autonox Robotics GmbH.

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