Redacted layout showing CTQ callouts, datums, and how pass/fail is stated.
Case study • CTQ evidence • Export-ready delivery
Case Study: Titanium Interface Component (Small Batch + CTQ Evidence)
An anonymized small-batch titanium interface component where CTQ evidence and careful handling were required to support a U.S. aerospace-adjacent program.
Program snapshot
Customer: Aerospace-adjacent engineering team (U.S. program; name withheld)
Part: Titanium interface component used in a precision assembly
Why it mattered: Material cost and machining complexity increase the cost of rework; CTQ planning reduces risk
SEMIX role: DFM feedback, machining execution, CTQ inspection reporting, and packaging discipline
| Field | Details (public) |
|---|---|
| Material / finish | Titanium |
| Size envelope | Anonymized (available under NDA) |
| Qty range | Prototype to low-volume programs (anonymized) |
| CTQ focus | Datums + functional features (CTQs defined at RFQ) |
| Tolerance & verification | Tight/critical features verified on CTQ-focused report (ranges shared under NDA) |
| Lead time | Quoted per RFQ; schedule aligned to customer gate dates (ranges under NDA) |
| Evidence pack | CTQ report • CoC • material/finish certs (as applicable) • packaging notes |
Key requirements
| Area | Requirement |
|---|---|
| Material handling | Titanium machining required controlled process choices to avoid scrap risk |
| CTQs | Fit and positional CTQs tied to assembly performance (per drawing) |
| Surface integrity | Controlled finish and careful deburr rules to avoid sharp edges or damage |
| Documentation | CTQ inspection report + traceability |
| Quantity | Small batch supporting validation build |
How we executed
SEMIX approached the build as a controlled workflow: confirm CTQs, plan measurement methods, and prevent revision drift.
- DFM review: confirmed feature strategy to reduce scrap risk and protect CTQs.
- Routing design: minimized unnecessary setups and managed tool access for complex surfaces.
- Inspection plan: mapped CTQs to measurement methods and confirmed reporting format.
- Packaging: protected functional surfaces and labeled clearly for receiving.
Quality evidence and documentation
To make receiving easy for a U.S.-based program, we shipped with evidence aligned to CTQs and revision control.
- CTQ inspection report aligned to assembly-related CTQs
- CoC with revision references
- Handling and packaging controls to protect critical surfaces
- Revision traceability for supplier quality review
Evidence pack preview (redacted)
On request, we can share redacted examples of the exact report formats our U.S. buyers receive—so your receiving team knows what to expect.
Revision- and PO-linked CoC format used for receiving acceptance.
Redacted packaging notes for protection, labeling, and kitted shipments (if applicable).
Outcome
- Small-batch parts accepted without delay due to clear evidence and labeling
- Reduced risk of scrap by focusing routing and inspection on CTQs
- A repeatable documentation package enabled easier follow-up orders
Outcome metrics are anonymized. The point is the workflow: stable routing, CTQ measurement, and receiving-ready documentation.
Outcome highlights
Evidence formatted for receiving review; CTQs highlighted to reduce back-and-forth.
CTQ inspection plan executed; CoC and required certs packaged with the shipment.
Delivery and documentation aligned to the customer’s internal gate / PO flow-down.
Deep dive (technical briefs)
If you want the engineering rationale behind the controls used in this program, start with these related briefs from our Technical Academy:
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Tool Wear & Tool Life Engineering in CNC Machining | Taylor + ISO 3685 + Monitoring
A deep, production-focused guide to wear mechanisms, defensible tool-life testing, responsible use of the Taylor equation, and practical tool-condition monitoring that reduces scrap and unplanned downtime.
Read the full brief
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Short‑Run SPC for High‑Mix CNC | EWMA & CUSUM Drift Detection
Applied EWMA and CUSUM control for high-mix machining: standardizing CTQs, setting limits, detecting small shifts early, and implementing practical reaction plans for CNC machining suppliers.
Read the full brief
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Cp/Cpk for CNC Machining | Preconditions, Correct Use & Red Flags
How to calculate and interpret Cp/Cpk properly for CNC machining: prerequisites (in-control process), subgrouping, high-mix pitfalls, and how to avoid misleading capability claims with U.S./EU buyers.
Read the full brief
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Decision Rules with Measurement Uncertainty | ISO 14253‑1 + ILAC G8 + GUM
Applied guide to uncertainty-based decision rules: guard bands, false accept/reject risk, and dispute-proof statements of conformity for precision CNC machining suppliers serving U.S./EU buyers.
Read the full brief
Evidence patterns (technical case studies)
Incident-style write-ups that show how SEMIX handles common failure modes and prevents receiving disputes:
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Case Study (Aerospace): Late‑Batch Reject Spike | Wear‑Driven Regime Change
Rejects appeared late in the batch. Root cause was wear-driven cutting regime change shrinking stability margins. Fix used wear gating plus EWMA/CUSUM drift detection.
Read the case
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Case Study (Semiconductor/Vacuum): Flatness Dispute Solved | Thermal State + Decision Rules
Flange flatness passed at supplier but failed at customer. Root cause traced to thermal-state mismatch and missing uncertainty-based decision rules. Includes corrective actions and reporting template.
Read the case
Documentation templates (print-to-PDF)
Want consistent receiving-ready evidence? These templates show typical formats SEMIX can provide with shipments (redacted samples available under NDA):
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Certificate of Conformance (CoC) template
Buyer-friendly CoC with clear scope, drawing revision reference, and statement of conformity.
Open template
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Inspection plan (CTQ) template
Characteristic table with method, sampling, decision rules, and reaction plans—built for high-trust programs.
Open template
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Final inspection report template
A report structure that reduces disputes: conditions, CTQ highlights, and declared decision rules.
Open template
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Packaging & shipping checklist template
Packaging spec, label control, photos, and shipment signoff for export-ready delivery.
Open template