Stewart platform
Our robots with 6 degrees of freedom
High-precision parallel positioning system
A Stewart platform is a parallel kinematic structure consisting of a moving platform connected to a fixed platform by 6 synchronously acting linear actuators.
This design enables an object placed on the moving platform to be moved with 6 DDL (degrees of freedom). In other words, the hexapod can move an object in 3 translations (Tx, Ty, Tz) and 3 rotations (Rx, Ry, Rz); any combination is possible.
This technology, derived from mechatronics, is particularly well suited to applications requiring fine, complex positioning along several axes positioned in any reference frame. In this way, an object placed on the moving table can be positioned, adjusted and assembled simply and easily.
they chose Stewart Symmetry Platforms
Why choose a Stewart platform?
A compact 6-axis solution
The parallel structure allows simultaneous translation (Tx, Ty and Tz) and rotation (roll, pitch and yaw) movements, with highly stable behaviour and excellent synergy between the actuators.
The six actuators act together on the platform, increasing rigidity and resolution.
Superior stiffness and precision
Thanks to parallel kinematics, loads are distributed across six actuators instead of being stacked. This limits deformation, improves bandwidth and ensures better repeatability.
Ideal for applications requiring micrometric or even nanometric stability.
A solution adaptable to the application
Each Stewart platform can be designed with different platform sizes, strokes, load capacities, and speeds. The HEXA_Sym simulation software makes it easy to test these parameters.
Complete customisation to meet any specific requirements.
Main components of Stewart platforms
Fixed and mobile platform
Designed with high flatness and rigidity to prevent any mechanical phenomena that could affect results and machine performance.
Linear actuators
Electric, providing high repeatability and resolution for precision platforms and high acceleration for dynamic platforms.
Joints
Cardan joints, spherical; decisive choice for the level of rigidity and angular precision.
Sensors
IMU, linear encoders, gauges depending on the application.
Stewart platform VS serial robot
| Critère | Plateforme de Stewart | Robot sériel |
| Degrés de liberté | 6 DDL simultanés (Tx, Ty, Tz, Rx, Ry, Rz) | Axes empilés indépendants |
| Rigidité | Très élevée (structure fermée) | Plus faible (axes superposés) |
| Encombrement | Compact et intégré (axes superposés) | Plus volumineux (axes empilés) |
| Précision | Excellente répétabilité | Cumul d'erreurs des axes |
| Cinématique | Parallèle | Sérielle |
Discover our range of precision positioning hexapods for loads ranging from a few grams to several tonnes.
Our hexapods are used as dynamic testing devices, generating trajectories with speeds of 1 m/s and accelerations of 1 g.
From feasibility studies to maintenance, Symétrie leverages its expertise in dynamics and positioning to offer you the best solutions.
Contact an expert:
Submit a form and receive a prompt response by e-mail or telephone from one of our sales engineers.
