Original scientific paper

https://doi.org/10.21278/TOF.463039722

Calibration of a 5-Axis CNC Machine for Making Orthoses by Means of a Vision System

Josip Nižetić orcid.org/0000-0002-3999-7165 ; Cognitus d.o.o, Zagreb, Croatia
Pero Raos orcid.org/0000-0001-9263-1325 ; University of Slavonski Brod, Mechanical Engineering Faculty, Slavonski Brod, Croatia
Goran Šimunović orcid.org/0000-0002-7159-2627 ; University of Slavonski Brod, Mechanical Engineering Faculty, Slavonski Brod, Croatia
Miho Klaić orcid.org/0000-0002-8315-4835 ; University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, Croatia
Alan Mutka ; Rochester Institute of Technology Croatia, Zagreb, Croatia

Abstract

Orthoses are aids that compensate for the loss of function of a particular part of the locomotor system, while prostheses are devices that compensate for the loss of a part of the body. Digital technologies have enabled the measurement and the production of such aids. The production technology is a CNC or robotics arm-based system comprising several modules that are relatively positioned with a submillimetre precision. In practice, the implementation and calibration of such systems are challenging, especially in cases of adapting already used hardware or when the control unit is undocumented or closed to outside interventions. Our approach responds to several challenges, resulting in a unique visual solution for fast and affordable calibration. This approach enables reading the machine positions from an external computer without a physical connection to the control unit, tracking the movement of the machine in near real-time, and finally calculating calibration parameters of the observed system.

Keywords

computer vision; CNC; parallel kinematic; calibration; orthoses

Hrčak ID:

284558

URI

https://hrcak.srce.hr/284558

Publication date:

20.10.2022.

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