Project Background
The client is a medical device manufacturer (name withheld under NDA).
Scope: precision stainless steel parts used inside a medical diagnostic device.
- Material: SUS304 stainless steel
- Process: CNC turning + milling (multi-axis)
- Volume: small batches across multiple runs
Client priorities:
- Stable material properties;
- High cosmetic requirements;
- Strict batch-to-batch consistency.
Key Requirements
Primary control items:
- Shaft diameter accuracy;
- Concentricity;
- Surface quality;
- Cosmetic consistency.
Technical requirements:
- Critical dimensions held to precision fit;
- Concentricity ≤ 0.015 mm;
- Surface roughness Ra ≤ 0.8 μm;
- No visible machining defects.
Process
Drawing Review
For the client drawing we:
- Analysed dimensional tolerances;
- Identified machining risks;
- Defined the inspection plan.
Machining Approach
Setup:
- Precision CNC machining;
- Dedicated work-holding;
- Multi-stage quality gates.
First-Article Confirmation
Completed:
- First article machined;
- Dimensional inspection;
- Client sign-off.
In-Process Inspection
During production:
- Precision metrology;
- Critical dimensions recorded;
- Final inspection before shipment.
Verifiable Documentation
- Product photographs;
- Inspection report;
- Material certificate;
- Outgoing inspection record.
Outcome
- Parts met the client drawing requirements;
- Specified batches delivered;
- Ongoing supply relationship established.