ZOLIX RAK Series High-Precision Motorized Rotary Stage

Overview

The ZOLIX RAK Series High-Precision Motorized Rotary Stage is an engineered optical positioning solution designed for demanding applications in photonics research, laser material processing, interferometric metrology, and multi-axis scanning systems. Based on a precision-machined aluminum alloy monocoque structure and a high-rigidity kinematic axis assembly, the stage employs a dual-stage mechanical architecture combining a hardened worm gear train with a low-backlash, preloaded worm wheel — delivering sub-arcsecond angular stability and long-term repeatability. Its operational principle relies on open-loop stepper motor actuation augmented by optional high-resolution rotary encoders (up to 17-bit resolution) for true closed-loop position verification. The stage operates under deterministic kinematic constraints, minimizing thermal drift and elastic deformation across its full 360° rotation range. Designed for integration into ISO-standard optical tables and vacuum-compatible environments (with optional sealing), the RAK series meets foundational mechanical and electromagnetic compatibility requirements aligned with IEC 61000-6-2/6-4 and CE directives.

Key Features

• High-stiffness, low-runout rotational axis using imported precision-ground bearings and preloaded angular contact configurations — axial and radial runout maintained below 20 arcseconds across all models.
• Optimized worm gear transmission with hardened, nitrided worm wheels and PTFE-impregnated bronze worm gears — enabling >10⁶ cycle service life under rated load without measurable backlash accumulation.
• Integrated mechanical zero-reference mark and engraved angular scale (1° divisions, 0.1° interpolation) on the top plate for rapid manual alignment and system-level calibration traceability.
• Standardized 4-pin LEMO and 15-pin D-sub connectors supporting TTL-level step/direction signals, limit switch inputs, and encoder quadrature outputs — fully compliant with NI Motion, Thorlabs Kinesis, and ZOLIX MC-Series controller ecosystems.
• Modular encoder interface supporting both incremental rotary encoders (e.g., Renishaw RESOLUTE™) and absolute circular gratings (e.g., Heidenhain ECN 113) — enabling bidirectional error mapping and real-time position correction per ISO 230-2 Annex B protocols.
• Thermally stable aluminum alloy housing with Type II anodization (hardness ≥350 HV) — minimizing coefficient-of-thermal-expansion-induced angular deviation (<0.02″/°C typical).

Sample Compatibility & Compliance

The RAK series accommodates standard optical components including mirror mounts (e.g., KM100, Ø25.4 mm lens tubes), fiber collimator assemblies, and multi-element interferometer arms. Mounting interfaces conform to M4 and M6 tapped patterns per ISO 2768-mK general tolerances. All electrical subsystems comply with RoHS 2011/65/EU and REACH SVHC regulations. Mechanical design adheres to ISO 9283:1998 for manipulator performance testing and supports GLP-aligned documentation packages (including factory calibration certificates traceable to NIM, Beijing). Optional vacuum-rated variants (10⁻⁵ mbar) are available with stainless steel shafts and fluorosilicone seals.

Software & Data Management

Native control is enabled via ZOLIX’s MC-Series motion controller firmware (v4.2+), supporting command-line ASCII protocol (SCPI-compliant syntax) and dynamic library APIs (C/C++, Python, LabVIEW). Real-time position logging at up to 1 kHz sampling rate is supported with timestamped CSV export. Firmware implements non-volatile memory storage for user-defined home offsets, velocity profiles, and error compensation maps. Audit trails for all motion commands — including timestamps, operator ID (via network authentication), and execution status — satisfy FDA 21 CFR Part 11 requirements when deployed with ZOLIX’s validated MC-Server application suite.

Applications

• Laser beam steering and polarization control in ultrafast optics setups requiring <5 µrad pointing stability.
• Rotational calibration of angle-sensitive detectors (e.g., quadrant photodiodes, position-sensitive detectors) per ISO 10110-12.
• Multi-angle reflectometry and ellipsometry stages for thin-film characterization in semiconductor metrology labs.
• Integration into automated optical inspection (AOI) platforms for PCB and wafer-level defect mapping.
• Alignment stages for free-space quantum optics experiments involving entangled photon source orientation.
• 3D structured light scanning systems where angular accuracy directly determines depth resolution (sub-10 µm at 1 m working distance).

FAQ

What encoder resolutions are supported for closed-loop operation?

The RAK stage accepts industry-standard incremental encoders with line counts from 1,000 to 20,000 lines/rev, as well as absolute encoders with 13–17-bit single-turn resolution. Custom interpolation firmware enables effective resolution down to 0.0001°.
Is vacuum compatibility available as a standard option?

Vacuum-rated configurations (10⁻⁵ mbar, non-outgassing materials, CF-35 flange mounting) are available under model suffix “-VAC” and require lead-time extension.
Can the RAK stage be synchronized with other motion axes in a multi-axis system?

Yes — via hardware trigger lines (TTL-sync) and software-coordinated trajectory planning using ZOLIX MC-Server’s distributed motion engine, supporting coordinated motion with linear stages (e.g., ZOLIX LTS series) under shared timebase.
What maintenance schedule is recommended for continuous industrial use?

Lubrication-free operation is guaranteed for 20,000 hours under ≤70% rated load. Annual verification of runout and repeatability using autocollimator-based metrology is advised for GMP-critical installations.
Are CAD models and API documentation provided?

STEP and IGES native CAD files, along with comprehensive SDK documentation (including Python examples and DLL function reference), are delivered with every unit and accessible via ZOLIX’s secure customer portal.