Ultra-Precision Machining for Harmonic & Planetary Reducer Components
Where Precision Turns Into Motion — CNC Excellence for Motion Control Gearboxes
In advanced motion systems — from robotic joints to aerospace actuators — precision speed reducers ensure accurate, smooth torque delivery under compact and lightweight constraints. Whether harmonic drives or planetary gear systems, the smallest error can cause backlash, vibration, or control drift.
With over two decades of experience, our CNC plant provides high-accuracy components for harmonic reducers, strain wave gears, RV gears, and high-ratio planetary gearboxes. We supply robot OEMs, automation integrators, and control system manufacturers worldwide.
✔ Why Precision Matters in Reducer Machining
Reducers operate under tight tolerances and high cycling rates. Challenges include:
- Flexspline deformation control: Ultra-thin-wall flexspline cups require uniform wall thickness and fine finish (<Ra 0.2μm).
- Wave generator profile: The elliptical cam profile must be precise within ±0.005mm to prevent torque ripple.
- Cycloidal gear machining: Non-involute curves require advanced interpolation and lobe geometry control.
- Backlash elimination: Requires close tolerance matching across the wave generator, flexspline, and circular spline.
- Dynamic runout & balance: Especially in high-speed planetary carriers and rotary actuators.
✔ Core Parts We Specialize In
| Component | Type | Key Specs |
|---|---|---|
| Flexsplines / Cup Gears | Harmonic | Thin wall (t ≤ 1.5mm), roundness ≤ 0.01mm |
| Wave Generators / Elliptical Discs | Harmonic | Profile tolerance ±0.005mm, surface Ra ≤ 0.2μm |
| Circular Splines / Ring Gears | Harmonic / Planetary | ID/OD teeth DIN 8–9, matched to cups |
| Cycloidal Discs & Needle Gears | RV | Custom lobe curve machining, flatness < 0.01mm |
| Planetary Carriers & Sun Gears | Planetary | Concentricity < 0.005mm, module 0.3–2.5 |
| Reducer Housings (Al, Steel) | All | Bore alignment, lightweighting, hard anodizing |
✔ Materials and Heat Treatment Expertise
| Material | Typical Use | Treatment |
|---|---|---|
| 40Cr / 42CrMo / 8620H | Gears, carriers, flexspline | Carburized (HRC 58–62), ground finish |
| SCM415 / 20CrMnTi | Cycloidal discs | Carburizing + superfinishing |
| A7075 / ADC12 Aluminum | Housings, wave generator holders | Anodizing + fine CNC for weight reduction |
| SUS304 / 17-4PH | Surgical-grade / corrosion-resistant parts | Aging / passivation |
| Tool Steel (SKD11 / H13) | Wear-resistant spline & cam parts | Vacuum hardened, lapped finish |
Surface finishes include superfinishing, PVD hard coating, precision honing, and micro-polishing for sealing surfaces.
✔ Our Processing Capabilities
Our workshop features dedicated setups for high-precision, small-modulus transmission parts:
- High-speed 5-axis CNCs – For complex cam and wave generator profiles
- Swiss-style turning (multi-axis) – For small, concentric shaft & cup parts
- Wire EDM / sinker EDM – For spline profiles and keyways in hard materials
- Tooth form grinding & lapping – For harmonic & RV spline accuracy
- High-speed balancing (ISO G2.5) – For wave generators and rotor-related parts
- Helium leak & fit testing – On sealed harmonic drive housings
Inspection tools include:
- Contour tracers and CMMs for cam profile validation
- Gear analyzers (involute and non-involute)
- Roundness, cylindricity, and wall-thickness checkers
- Optical flatness + roughness test (Ra < 0.2μm)
✔ Global Project Highlights
- ✅ Harmonic flexsplines and circular splines for Japanese SCARA/Delta robot manufacturer
- ✅ RV gear needle cages for Korean collaborative robot drives (Ra < 0.15μm)
- ✅ Elliptical wave generator plates for EU-based surgical robotic arm joint reducers
- ✅ Cycloidal disk + eccentric shaft sets for a U.S. automation gearbox producer
✔ Why Motion Gear OEMs Work With Us
- ⚙️ Complete know-how on harmonic, RV, and planetary gear reducer components
- 🔍 Ultra-precision machining down to ±0.002mm, even on thin-walled and hardened parts
- 🧩 Batch-to-batch accuracy — full traceability, 100% inspection, and SPC available
- 🌐 Trusted by Tier-1 OEMs in robotics, aerospace actuators, and EV servo drives
- 🕒 Rapid prototyping — samples in 10–15 days with DFM support and test data
🤖 Machining Precision That Drives the Most Advanced Gears on Earth
In every robot joint, actuator, or smart drive unit — our machined components are the silent enablers of motion. We don’t just make gears. We make movement… precise.
📥 Ready to quote? Send your 2D/3D files and we’ll respond within 24 hours.