Encoder Code Disk Fixing Ring for Humanoid Robots: Precision CNC Machining China Solution

The encoder code disk fixing ring is a critical precision component in humanoid robot rotary actuators, specifically designed to securely mount and protect the encoder code disk. Within the robot joint module, this fixing ring engages with the encoder readhead base through an interference fit method, maintaining a constant gap (typically controlled within 0.1-0.3mm range) between the code disk and readhead, preventing displacement deviations caused by vibration or temperature changes. Our fixing rings are manufactured using CNC precision machining technology in China, with strict dimensional tolerance control (typically maintained within ±0.005mm) and dynamic balance testing, ensuring no vibration noise is introduced in high-speed rotation environments (up to 10,000 RPM).

As the core positioning element of the encoder system, the machining quality of the fixing ring directly affects the accuracy of position feedback signals. We use aerospace-grade aluminum alloy material (7075-T6) and special surface hardening treatment processes, enabling the product to achieve both lightweight (density only 2.8g/cm³) and high strength (tensile strength up to 572MPa) characteristics, capable of withstanding impact loads from frequent start-stop operations of robot joints. The product surface undergoes anodizing treatment (black) with laser engraving of "SINBO" identification, ensuring both aesthetics and excellent corrosion resistance.

• Precision Machining with Strict Tolerances: Our encoder code disk fixing rings are manufactured using CNC precision machining technology in China, ensuring dimensional tolerances are strictly controlled within ±0.005mm. This precision machining guarantees the cooperation accuracy between the fixing ring and code disk, avoiding code disk shaking or readhead gap不均匀 caused by dimensional deviations. The fixing ring's roundness error is less than 0.003mm, ensuring excellent dynamic balance performance during high-speed rotation, reducing vibration and noise.
• High Stability and Reliability: The fixing ring employs a thermal expansion coefficient matching design, ensuring consistent expansion rates between the metal ring and glass/metal code disk during temperature changes, preventing cooperation loosening or stress accumulation due to temperature fluctuations. The product undergoes rigorous environmental adaptability testing, including temperature cycling (-40℃ to +85℃), vibration testing (5-2000Hz frequency range), and endurance testing (over 10 million insertion-extraction cycles), ensuring stable performance in various harsh environments.
• Premium Materials and Surface Treatment: We select aerospace-grade aluminum alloy 7075-T6 as the base material, known for its excellent strength-to-weight ratio (tensile strength 572MPa, density only 2.8g/cm³) and good machinability. The surface undergoes hard anodizing treatment (thickness 25±5μm), forming a hard, wear-resistant, insulating oxide layer with surface hardness up to HV400, significantly improving the product's wear and corrosion resistance.
• Design Optimization and Integration Convenience: The fixing ring features a hollow lightweight design, ensuring structural strength while minimizing weight (approximately 60% lighter than traditional stainless steel), helping reduce the rotational inertia of robot joints and improve dynamic response speed. The product design considers installation convenience, providing specialized installation guidance structures and error-proofing designs, making the assembly process more efficient and less prone to code disk damage.
• Strict Quality Control and Testing: Each fixing ring undergoes 100% full inspection, including dimensional measurement, appearance检查, dynamic balance testing, and material verification, ensuring only qualified products are delivered to customers. We establish a complete product traceability system, with each part having a unique batch number identifier that traces the entire quality information process from raw materials to finished products.

• Humanoid Robot Joint Modules: Encoder code disk fixing rings are widely used in various humanoid robot rotary joint actuators, particularly in shoulder, hip, and wrist joints that require precise positioning. In these applications, the fixing ring ensures accurate positioning of joint motor encoders, providing reliable position feedback for the robot's complex movements. Optimus humanoid robots require such precision fixing rings in all 28 degree-of-freedom joints.
• Industrial Robot Precision Reducers: In the industrial robot field, our fixing rings are used in encoder systems of harmonic reducers and precision planetary reducers. These reducers require extremely high positioning accuracy (typically within ±1 arc-second), and the stable performance of fixing rings ensures long-term reliability under high reduction ratios. Particularly in welding, spraying, and precision assembly robots, the performance of fixing rings directly affects final product quality.
• Collaborative Robot Joint Modules: Collaborative robots (Cobots) require smooth movement and precise control of joints due to direct interaction with humans. Our fixing rings are used in collaborative robot joint modules, ensuring accurate reading of torque sensors, enabling adaptive force control and collision detection functions. The KIE series hollow absolute encoders use fixing rings with similar structures.
• Precision Optical Encoder Systems: Beyond robotics, our fixing rings are widely used in various high-precision optical encoder systems, including CNC machine tools, semiconductor equipment, medical instruments, and aerospace control systems. These applications require fixing rings with exceptional temperature stability and vibration resistance, which our products achieve through special design and material selection.
• Servo Motors and Actuators: Modern servo motors and linear actuators commonly use high-resolution encoders as position feedback devices, where our fixing rings play a key role in encoder assembly. Particularly in frameless torque motors, fixing rings need to meet both compact size and high precision requirements, which is exactly where our products excel.

We provide comprehensive customization services to meet different customers' special requirements:

• Size Customization: We can perform custom production according to customer requirements for inner/outer diameter sizes and thickness, supporting various specifications from micro sizes (minimum inner diameter 3mm) to large sizes (maximum outer diameter 50mm). The tolerance grade of custom products can be adjusted according to application needs, with the highest reaching ±0.002mm ultra-precision level.
• Material Selection: In addition to standard aerospace aluminum alloy, we also provide stainless steel series (304, 316, 17-4PH), titanium alloy (TC4), and engineering plastics (PEEK, PVDF) options to meet different application environment needs. For example, we provide non-magnetic stainless steel versions for ultra-high vacuum environments, and recommend 316 stainless steel or PEEK materials for strong corrosion environments.
• Surface Treatment Options: According to different application environments, we provide various surface treatment options, including ordinary anodizing (multiple colors available), Teflon coating (anti-adhesion), electroless nickel plating (wear resistance), and passivation treatment (stainless steel anti-rust). For applications requiring insulation, we can provide anodized insulation treatment with surface resistance up to 10⁹Ω or higher.
• Special Function Design: For customers with special requirements, we can integrate temperature sensing elements, grounding springs, or shielding layers on the fixing ring, achieving multiple functions in one component. We also provide anti-loosening designs, including thread locking, split pin holes, and other solutions to ensure reliability in extreme vibration environments.

We provide customers with comprehensive technical support and service guarantees:

• Technical Consultation and Design Support: Our engineering team provides free technical consultation to help customers select the most suitable fixing ring specifications and materials. For complex application scenarios, we can provide custom design services, participating in customers' encoder system design to ensure optimal matching from the source.
• Sample Provision and Testing Verification: We provide free samples (typically 3-5 pieces) to qualified customers for testing and verification, helping customers evaluate product performance. Meanwhile, we can provide complete test reports, including dimensional inspection, material certification, and environmental test data, facilitating customer quality assessment.
• Mass Production and Delivery: We have a mature supply chain and efficient production system that can guarantee on-time delivery for large-volume orders (typically 4-6 weeks delivery cycle). We implement strict inventory management, maintaining certain safety stocks for commonly used specification products to respond to customer emergency needs.
• Quality Assurance and After-Sales Service: All our products come with a 12-month quality guarantee period, during which any problems caused by material or manufacturing defects can be replaced free of charge. We establish a rapid response mechanism, typically providing initial response and solutions within 24 hours for technical problems reported by customers.