Precision Portfolio Series A

High-Precision Engineered Kinematic Components

Verified manufacturing records: Advanced multi-axis CNC turn-mill, specialized gear-tooth tooling, and hybrid metal-polymer assemblies for mission-critical robotics and aerospace drive systems.

Custom 5-Axis CNC Gearbox Shell
Custom 5-Axis CNC Machined Steel & Aluminum Universal Joint Base and Gearbox Shell
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±0.005mm
Micro-Tolerance Precision
AGMA 10+
Injection Gear Standard
5,000+ t
Annual Manufacturing Capacity
<24 hrs
DFM Engineering Turnaround
Engineering Core

Precision Polymer Tribology: Overcoming Kinematic Creep & Thermal Drift

In high-reliability mechatronic actuators, switching from machined bronze or alloy steel to high-performance thermoplastic gears reduces inertia by up to 75% and suppresses airborne acoustic harmonics by >12 dB. Achieving high volumetric throughput without tooth-geometry degradation requires mastery over viscoelastic deformation, non-isotropic mold shrinkage, and high-temp shear stress.

Polyoxymethylene (POM-C / Acetal) Solutions

The global benchmark for spur, helical, and planetary gear sets requiring high fatigue endurance, dimensional moisture stability, and dry low-friction contact.

  • Low moisture absorption (0.2% max at saturation)
  • Superior flexural fatigue endurance at high cycling
  • In-mold PTFE/MOS2 internal lubrication additives

Polyamide (PA66 / PA46 + Glass / Carbon Fiber)

Engineered for high instantaneous peak load carrying capacity, structural worm gears, and extreme shock-loading applications across powertrain subsystems.

  • High yield tensile strength (up to 195 MPa reinforced)
  • Damped tooth engagement suppressing gear noise
  • Continuous thermal operating stability up to 135°C

Ultra-Performance PEEK & PPA Polymers

The pinnacle of plastic gearing for harsh under-the-hood, sterilization-resistant surgical robotics, and aggressive chemical processing environments.

  • Continuous thermal operating window up to 250°C
  • Resistant to hydrocarbons, acids, and gamma rays
  • Capable of replacing steel in dry-running gearboxes
Kinematic Property / Metric Unfilled POM-C PA66 + 30% Glass Fiber PEEK 450FC30 (Carbon/PTFE) Machined Brass / 6061-T6
Density (g/cm³) 1.41 1.35 1.45 2.70 - 8.50
Yield Tensile Strength (MPa) 65 - 70 175 - 190 210 - 240 290 - 380
Dynamic Coeff. of Friction (Dry vs Steel) 0.22 - 0.28 0.28 - 0.35 0.12 - 0.18 0.35 - 0.50
Max Service Temp (°C continuous) 100°C 130°C 250°C 160°C - 200°C
Acoustic Noise Attenuation Excellent (-8 to -10 dB) High (-6 to -8 dB) Moderate (-4 to -6 dB) Reference (0 dB Baseline)
Macro Deployments

Cross-Sector Engineered Polymer Kinematic Solutions

Turnkey precision gear manufacturing engineered to satisfy strict international standards, including ISO 13485 medical protocols, IATF 16949 automotive quality gates, and industrial automation standards.

Automotive Mechatronics & EV Actuators

Lightweighting without sacrificial gear stiffness: Actuators for electronic park brakes, HVAC damper louvers, smart rearview mirrors, and EV thermal management ball-valve gears designed for >500,000 smooth cycles under extreme sub-zero to desert thermal swings.

Medical Technology & Surgical Robotics

Zero-backlash precision planetary micro-gearboxes for intelligent surgical scalpels, volumetric infusion pumps, and wearable insulin pumps. Manufactured in cleanroom-compliant molding environments using biocompatible, USP Class VI certified PEEK and POM.

Smart Robotics & Industrial Drones

Cycloidal gear drive assemblies and spur-gear trains for collaborative robotic joints, UAV gimbal positioning, and automated guided vehicles (AGVs). Integrated insert overmolding of metal shafts directly into carbon-reinforced polymer gears prevents slippage.

High-End Appliances & Smart Office

Acoustically silent drive gearboxes for luxury consumer appliances, automated office paper handling, precision commercial coffee brewing actuators, and pan-tilt-zoom optical security cameras requiring silent motion profiles below 32 dBA.

China Factory 4.0

Supply Chain Resilience & Digital Injection Gear Tooling

Bridging rapid prototyping and high-throughput volume production through autonomous mold manufacturing, real-time cavity pressure sensing, and centralized metrology in Shenzhen, China.

Scientific Molding & In-Cavity Sensors

Our toolsets integrate piezoelectric cavity pressure transducers and thermal sensor arrays. Mold gates close precisely when the volumetric pack profile reaches ideal pack density, eliminating sink marks on tooth flanks and eliminating internal void stress before ejection.

Sub-Micron EDM Tooling Infrastructure

Gear cavities are cut using high-speed wire-EDM and oil-bath mirror spark erosion machines running at positioning accuracies of ±0.001 mm. This allows conjugate involute profiles with root fillet radii that maximize tooth bending strength under load.

Guaranteed IP Shield & Direct DFM Handshake

Direct engagement with Sunmy Hardware's project engineering division under binding mutual Non-Disclosure Agreements (NDA). Drawings and CAD models are never outsourced to broker platforms or trading middlemen, ensuring absolute security for proprietary geometry.

Strategic Framework

Technical Roadmap & Global Procurement Requirements

What global procurement teams and lead mechanical engineers must audit when selecting an overseas plastic gear manufacturing partner.

Full Inspection Traceability

Every lot is delivered with comprehensive metrology verification: Zeiss 3D CMM inspection reports, First Article Inspection (FAI) per AS9102/ISO protocols, material lot certifications, and spectral RoHS/REACH compliance documentation.

Rapid Bridge-to-Volume Lifecycle

Reduce risk during rapid market entry. Sunmy executes initial functional prototypes via high-accuracy 5-axis CNC machining in engineering plastics, moves to fast aluminum bridge molds for pilot builds, and transitions to hardened multi-cavity steel molds (H13/S136) for millions of cycles.

Hybrid Metal-Plastic Co-Engineering

Eliminate secondary bonding lines. We manufacture precision CNC-turned brass or stainless shafts, precision stamped hubs, and insert-overmold them with engineered thermoplastics in a unified production flow.

Procurement & Tech FAQ

Frequently Asked Questions on Precision Plastic Gear Manufacturing

Direct answers for sourcing managers, mechanical leads, and supplier-quality engineers evaluating Sunmy Hardware's custom manufacturing services.

How does Sunmy Hardware compensate for non-linear polymer shrinkage in gear tooth geometry?
Polymer gear shrinkage is rarely isometric because crystalline polymers (like POM or PA66) shrink differently across tooth thickness versus rim thickness. We employ Autodesk Moldflow simulations coupled with proprietary historical mold compensation algorithms. We cut initial electrode cavities slightly undersized, conduct initial mold trials (T0/T1), measure radial tooth composite error on a coordinate measuring machine (CMM) and double-flank gear tester, and then perform micro-EDM tool tuning to dial in nominal AGMA 9 to 11 standards.
What tolerances can be maintained on CNC machined prototype gears versus molded gears?
For CNC machined prototypes cut from extruded POM or PEEK stock, Sunmy can hold critical bore diameters and shaft interfaces to ±0.005 mm, with profile concentricity within ±0.01 mm. For high-volume injection-molded production gears, critical metal-insert interfaces hold ±0.005 mm, while gear tooth pitch, runout, and base diameter hold ±0.015 mm to ±0.025 mm depending on overall module size and fiber filler ratios.
How do you address moisture-induced swelling in Polyamide (Nylon) gear applications?
Standard PA6 or PA66 can absorb up to 2.5% to 8% atmospheric moisture, resulting in pitch diameter expansion and potential gear binding. When high moisture resistance is required, we advise transitioning to POM-C, PA12, or PPA. If PA66 is required for wear resistance, we incorporate dimensional expansion tolerances directly into the backlash calculations during DFM and execute controlled post-mold moisture conditioning before final CMM verification.
What is the typical lead time from CAD model approval to First Article Inspection (FAI)?
For rapid prototypes via 5-axis CNC machining, lead times are 3 to 7 working days. For rapid bridge tooling (aluminum molds for 500 to 5,000 parts), lead times are typically 14 to 18 working days. Production-hardened multi-cavity injection molds (S136 or H13 steel rated for 500,000+ cycles) require 25 to 35 calendar days, inclusive of T1 molding trials, full CMM documentation, and FAI report sign-off.
How is intellectual property protected when sharing proprietary gear profiles?
We sign strict Non-Disclosure Agreements (NDAs) before customer CAD files are transferred. Sunmy Hardware operates owned manufacturing facilities in Shenzhen with dedicated internal engineering workstations. Customer design files remain in encrypted internal servers and are never shared with unauthorized external brokers.
Precision Portfolio Series B

Industrial-Grade Assemblies & Specialized Hardware

Complementary precision parts engineered for mission-critical hydraulic valves, cycloidal reducers, EOAT robotics, and optical instruments.

Stainless Steel Filter Sleeve
ODM Custom CNC Precision Turned Stainless Steel Filter Sleeve (OEM/ODM Industrial)
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Hydraulic Solenoid Valve Core
Custom High-Performance Hydraulic Solenoid Valve Core Precision Turned Spare Parts
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Vacuum Gripper Plates for Robotic EOAT
China Custom CNC Machined Foam Vacuum Gripper Plates for Robotic EOAT Automation
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Anodized Sealing Rings for Semiconductor Instruments
China Custom CNC Machined Anodized Sealing Rings for Semiconductor & Optical Units
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Direct Engineering Portal

Ready to Validate Your Custom Gear or Kinematic Drawing?

Submit your CAD file (.STEP, .IGS, .DWG) with technical requirements. Our senior application engineers respond within 24 hours with complete DFM manufacturability feedback, recommended polymer grades, and an optimized tooling route.