A new concept of modular kinematics to design ultra-high precision flexure-based robots
Conference: ISR/ROBOTIK 2010 - ISR 2010 (41st International Symposium on Robotics) and ROBOTIK 2010 (6th German Conference on Robotics)
06/07/2010 - 06/09/2010 at Munich, Germany
Proceedings: ISR/ROBOTIK 2010
Pages: 8Language: englishTyp: PDFPersonal VDE Members are entitled to a 10% discount on this title
Richard, Murielle; Clavel, Reymond (LSRO, Swiss Federal Institute of Technology Lausanne (EPFL), Lausanne, Switzerland)
This work deals with the kinematic conception and the mechanical design of ultra-high precision robots, which are at present costly to develop, both in time and money. The aim of this paper is thus to introduce a new modular concept of kinematics which allows to significantly reduce the time-to-market and a new double-stage flexure-based pivot. Regarding the modular concept of kinematics, this 'robotic Lego' consists in a finite number of building bricks allowing to rapidly design a high precision machine and to easily modify its mobility. The realised mock-up of a 4-DOF (Degrees of Freedom) robot, transformable into a 5-DOF one, validates this concept and the mechanical design of its bricks. Flexure hinges are used to achieve the aimed sub-µm precision; however, existing flexure-based rotary joints are not able to fulfil the requirements of some applications, as they present a too low angular stroke and a parasitic motion of their centre of rotation. Thus, this paper also introduces a new double-stage pivot based on blades working in torsion; experiments performed on a prototype allow to validate its principle and the simulation model used for its development.