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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? → 17-4 PH selection, H900 aging, NDT testing Robot joint at ±0.002 mm? → 7075-T651 aluminum, 5-axis CNC, hard anodizing Zero-leak connector for AI servers? → 316L stainless, helium leak test, 50K/month Copper contact plate for EV relay? → C110 copper machining, silver plating, conductivity Ti-6Al-4V bracket for aircraft? → 5-axis CNC, high-pressure coolant, AS9100D FAIR Magnetic stainless for solenoid valve? → 430F selection, honing to H6, helium leak at 3.75 MPa Beryllium copper for high-voltage contact? → C17200 machining, conductivity vs strength trade-off Ti-6Al-4V for medical implant? → Biocompatibility, anodizing, medical-grade traceability Robot parts at ±0.008 mm tolerance? → Gear hobbing, harmonic reducer, tight-tolerance strategy 500K+ volume copper terminal? → Stamping + CNC finishing, progressive die, cost per unit Hydraulic cylinder bore to H8 roundness? → 2738 pre-hardened steel, honing, hard chrome plating Corrosion-resistant propeller hub for marine? → C95800 Ni-Al bronze, DNV certification, NDT UHV-compatible flange for semiconductor? → 316L stainless, CF flange standard, helium leak to 1×10⁻⁹ Pa·m³/s Turned, stamped and wire-formed parts for instruments? → SUS303 turning, aluminum stamping, GFRP end pieces — one supplier, recurring series PA6 rollers for conveyor chains? → Bar-stock turning, DIN ISO 2768-mK, Rz 6.3, sample-first, recurring call-offs Spare parts and shafts from drawing, batch of 1? → 42CrMo4/16MnCr5 turning, flanges, bearing rings — batches from 1 pc Valve seats, spindles and balls in 316 or brass? → Swiss turning, Monel option, 1,000–50,000 pcs series Brass pressfitting blanks at 10,000+ per month? → CW617N/DZR, cold forging + turning, screwed fittings and valve bodies Special screws and precision pins from drawing? → Cold forging + thread rolling, plastic screws, tiered pricing 316L hygienic-design parts for packaging machines? → Filling valve components, hydrocarbon cleaning Wear parts for farm machinery in 2,000–20,000 pcs lots? → 42CrMo4 QT pins and bushings, bimetallic quick couplings Instrument components for endoscopes and cannula holders? → 1.4305/1.4404/titanium, Swiss turning, component supplier Second source with IATF 16949 and PPAP? → Bushings, solenoid components, HV contact parts, gear blanks Hydraulic valve blocks and piston/rod-end parts? → 42CrMo4, coordinated hard chrome plating, connectors Vacuum chamber parts and CF flanges in Kovar or PEEK? → Low volume from 50 pcs, semiconductor-grade cleanliness 10,000+ pcs/month brass terminals and slotted contacts? → CuZn39Pb3/C360 Swiss turning + cold heading, gold/tin plating coordinated Perfume cap blanks pre-polished to Ra ≤ 0.2? → Brass blanks supplied Tier2, decorative plating left to local finishers Aerospace Tier2 outsourced component layers? → Titanium/alloy steel shafts, bushings, spacers, fasteners — EN 10204 3.1 + FAI Pure machined railway parts (no welding)? → Shafts, bushings, brake parts in 500–5,000 pcs, full documentation
Project Summary

Industry Coverage

IndustryKey Processes
Oil & GasCNC turning, NDT, HVOF coating
Robotics5-axis CNC, hard anodizing, gear hobbing
AI / Data CenterCNC turning/milling, helium leak test
New Energy VehiclesCNC turning, honing, silver plating
Aerospace5-axis CNC, EDM, FAIR documentation
Power SystemsStamping, CNC finishing, plating
Medical Devices5-axis CNC, anodizing, MDM traceability
Solar EnergyProgressive stamping, CNC, plating
Industrial MachineryCNC boring, honing, hard chrome plating
MarineCNC turning, DNV-certified NDT, dynamic balancing
SemiconductorCNC precision machining, CF flange, helium leak testing

Typical Tolerances Achieved

Feature TypeTolerance
Valve bore (honed)H6 (+0.008 / +0.003)
Robot bearing bore±0.002 mm
Connector sealing surfaceRa ≤ 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 surfaceRa ≤ 0.8 μm, leak rate ≤ 1×10⁻⁹ Pa·m³/s

Volume Capabilities

Volume TierTypical Method
1 – 10 pcs5-axis CNC, manual inspection, FAIR
10 – 100 pcsCNC machining, CMM sampling
100 – 10K pcsDedicated fixtures, automated testing
50K+ pcs/monthMulti-spindle, inline QC, 100% pressure test
Oil & Gas
Robotics
AI / Data Center
New Energy Vehicles
Aerospace
Power Systems
Medical Devices
Solar Energy
Industrial Machinery
Marine
Semiconductor
Industry Applications
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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