Auniontech HAO-6DOF Precision Hexapod Positioning Stage

Overview

The Auniontech HAO-6DOF Precision Hexapod Positioning Stage is a high-performance, compact parallel kinematic platform engineered for sub-microradian and sub-micrometer motion control in demanding optical, metrological, and microfabrication applications. Based on the Stewart platform architecture, it employs six independently actuated, high-resolution PMSM-driven legs arranged in a symmetric octahedral configuration—each leg featuring precision ball-jointed ends and integrated position feedback via high-stability linear encoders or rotary resolvers. This parallel topology delivers inherent mechanical stiffness, minimized cumulative error propagation, and exceptional dynamic response compared to serial-stage alternatives. Unlike stacked multi-axis systems, the hexapod’s single moving platform eliminates Abbe errors, orthogonality deviations, and sequential backlash accumulation—critical for alignment-critical tasks such as interferometric cavity tuning, fiber coupling, and synchrotron beamline instrumentation. Its design conforms to fundamental principles of rigid-body kinematics, enabling simultaneous, coordinated control across all six degrees of freedom (X, Y, Z, θ_X, θ_Y, θ_Z) with deterministic forward/inverse kinematic mapping.

Key Features

• Sub-micrometer linear repeatability (±0.1 µm in Z, ±0.2 µm in X/Y) and sub-µrad angular repeatability (±2 µrad in θ_X/θ_Y, ±3 µrad in θ_Z) validated under ISO 230-2 conditions
• Integrated permanent magnet synchronous motors (PMSM) with zero-sliding-contact commutation—ensuring wear-free operation, low torque ripple, and extended service life (>20,000 hours MTBF)
• Compact monolithic baseplate and top platform fabricated from passivated stainless steel and anodized aerospace aluminum—optimized for thermal stability and vacuum compatibility (UHV-rated variants available with non-outgassing materials and ceramic bearings)
• Real-time closed-loop control architecture supporting trajectory interpolation at 1 kHz update rate, with programmable jerk-limited motion profiles to suppress mechanical resonance
• Low backlash performance: <0.1 µm axial and <3 µrad angular hysteresis—achieved through preloaded flexure joints and dual-stage encoder feedback
• Modular controller interface supporting EtherCAT, USB 2.0, and RS-422 protocols; compatible with industry-standard motion APIs (e.g., NI Motion, MATLAB Real-Time Toolbox, Python pyMotion)

Sample Compatibility & Compliance

The HAO-6DOF stage supports payloads up to 5 kg (horizontally mounted) and 2.5 kg in arbitrary orientation, maintaining specified accuracy and stability per ISO 10360-8 (coordinate measuring machines) and VDI/VDE 2617 Part 9 (multi-axis positioning systems). It meets RoHS Directive 2011/65/EU and CE marking requirements for electromagnetic compatibility (EN 61326-1) and low-voltage safety (EN 61000-6-2/6-4). Vacuum-compatible configurations comply with ASTM E595-22 outgassing specifications (<1.0% TML, <0.1% CVCM) and are suitable for integration into UHV environments (≤10⁻⁹ mbar) when equipped with metal-sealed feedthroughs and dry-lubricated actuators. All firmware and motion libraries adhere to GLP-relevant audit trail logging standards for traceable calibration records.

Software & Data Management

Auniontech provides the HexaControl Suite—a cross-platform (Windows/Linux/macOS), GUI-based application enabling intuitive point-to-point, path-defined, and script-driven motion sequencing. The software includes built-in kinematic calibration wizards, real-time trajectory visualization, and post-acquisition data export in HDF5 and CSV formats. For regulated environments, optional FDA 21 CFR Part 11-compliant modules deliver electronic signatures, role-based access control, and immutable audit logs. Integration with third-party platforms—including LabVIEW, Python (via PySerial and NumPy), and MATLAB Simulink—is supported through documented C/C++ SDKs and RESTful API endpoints. All motion parameters are stored in non-volatile memory with checksum verification to ensure configuration persistence across power cycles.

Applications

• Optical Alignment & Metrology: Active stabilization of interferometer arms, collimator tip/tilt correction, and adaptive optics wavefront sensor registration
• Microfabrication & Semiconductor Inspection: Wafer-level alignment for maskless lithography, probe station positioning, and electron-beam lithography stage synchronization
• Biophotonics & Microscopy: Multi-angle sample orientation for light-sheet fluorescence microscopy (LSFM), confocal volume scanning, and optical tweezers trap positioning
• Aerospace & Defense Testing: Inertial sensor calibration rigs, gimbal simulation for seeker head testing, and vibration-isolated payload staging
• Quantum Technology: Cold-atom chamber mirror alignment, ion trap electrode positioning, and cavity quantum electrodynamics (cQED) resonator tuning

FAQ

What is the difference between a hexapod and a stacked XYZ-rotation stage?
A hexapod uses parallel kinematics—six coordinated actuators directly control a single rigid platform—eliminating cumulative errors, Abbe offsets, and mechanical crosstalk inherent in serial architectures.
Is vacuum compatibility standard or optional?
Vacuum-rated versions are optional; standard units operate in ambient air. UHV variants require custom quoting and include stainless-steel construction, ceramic bearings, and bakeable cabling.
Can the stage be integrated into a cleanroom environment?
Yes—the non-particulating surface finish, absence of lubricants in the actuator path, and modular cable management meet ISO Class 5 (Class 100) cleanroom requirements.
What level of environmental stability is required for optimal performance?
For sub-micron repeatability, ambient temperature must be stabilized within ±0.5 °C over measurement duration; active thermal compensation algorithms are available as a firmware option.
Does the system support third-party motion controllers?
Yes—EtherCAT slave implementation enables seamless integration with Beckhoff, Siemens, and Delta Tau controllers using standard CiA 402 profile.