Case Studies
Not marketing fluff. Each case is a technical deep dive into a real manufacturing project — material selection rationale, machining strategy, quality testing protocols, cost structure, and the mistakes that kill first-article yield. anonymized to protect client confidentiality, detailed enough for engineers to learn from.
Quick-Find: What challenge are you solving?
NACE-compliant valve for H2S service?
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17-4 PH selection, H900 aging, NDT testing
Robot joint at ±0.002 mm?
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7075-T651 aluminum, 5-axis CNC, hard anodizing
Zero-leak connector for AI servers?
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316L stainless, helium leak test, 50K/month
Copper contact plate for EV relay?
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C110 copper machining, silver plating, conductivity
Ti-6Al-4V bracket for aircraft?
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5-axis CNC, high-pressure coolant, AS9100D FAIR
Magnetic stainless for solenoid valve?
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430F selection, honing to H6, helium leak at 3.75 MPa
Beryllium copper for high-voltage contact?
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C17200 machining, conductivity vs strength trade-off
Ti-6Al-4V for medical implant?
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Biocompatibility, anodizing, medical-grade traceability
Robot parts at ±0.008 mm tolerance?
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Gear hobbing, harmonic reducer, tight-tolerance strategy
500K+ volume copper terminal?
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Stamping + CNC finishing, progressive die, cost per unit
Hydraulic cylinder bore to H8 roundness?
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2738 pre-hardened steel, honing, hard chrome plating
Corrosion-resistant propeller hub for marine?
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C95800 Ni-Al bronze, DNV certification, NDT
UHV-compatible flange for semiconductor?
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316L stainless, CF flange standard, helium leak to 1×10⁻⁹ Pa·m³/s
Project Summary
Industry Coverage
| Industry | Key Processes |
|---|
| Oil & Gas | CNC turning, NDT, HVOF coating |
| Robotics | 5-axis CNC, hard anodizing, gear hobbing |
| AI / Data Center | CNC turning/milling, helium leak test |
| New Energy Vehicles | CNC turning, honing, silver plating |
| Aerospace | 5-axis CNC, EDM, FAIR documentation |
| Power Systems | Stamping, CNC finishing, plating |
| Medical Devices | 5-axis CNC, anodizing, MDM traceability |
| Solar Energy | Progressive stamping, CNC, plating |
| Industrial Machinery | CNC boring, honing, hard chrome plating |
| Marine | CNC turning, DNV-certified NDT, dynamic balancing |
| Semiconductor | CNC precision machining, CF flange, helium leak testing |
Typical Tolerances Achieved
| Feature Type | Tolerance |
|---|
| Valve bore (honed) | H6 (+0.008 / +0.003) |
| Robot bearing bore | ±0.002 mm |
| Connector sealing surface | Ra ≤ 0.4 μm |
| Aerospace bracket critical feature | ±0.002 mm |
| Copper contact plate flatness | ≤ 0.005 mm |
| Hydraulic cylinder bore roundness | ≤ 0.005 mm, Ra ≤ 0.2 μm |
| Propeller hub taper bore | ±0.01 mm, NDT Class A |
| Vacuum flange sealing surface | Ra ≤ 0.8 μm, leak rate ≤ 1×10⁻⁹ Pa·m³/s |
Volume Capabilities
| Volume Tier | Typical Method |
|---|
| 1 – 10 pcs | 5-axis CNC, manual inspection, FAIR |
| 10 – 100 pcs | CNC machining, CMM sampling |
| 100 – 10K pcs | Dedicated fixtures, automated testing |
| 50K+ pcs/month | Multi-spindle, inline QC, 100% pressure test |
About these case studies
All technical details are based on actual manufacturing projects at Sinbo Precision. Customer identities, exact part numbers, and proprietary design parameters have been anonymized. Process data, material choices, and tolerance values represent typical requirements for each product category. The goal: help engineers understand what really matters before sending out drawings for quote.
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