Redacted layout showing CTQ callouts, datums, and how pass/fail is stated.
Case study • CTQ evidence • Export-ready delivery
Case Study: Actuator Housing (Turn‑Mill Routing + Concentricity CTQs)
An anonymized actuator housing program combining turning and milling operations, where concentricity-driven CTQs and receiving-ready documentation were critical for a U.S. team.
Program snapshot
Customer: Aerospace sub-system supplier (U.S. program; name withheld)
Part: Actuator housing with functional bores and mounting features
Why it mattered: Functional bores and datum relationships drive assembly performance; documentation and revision control are typically strict
SEMIX role: Routing planning (turn + mill), CTQ inspection planning, and documentation package delivery
| Field | Details (public) |
|---|---|
| Material / finish | Anonymized (share under NDA if needed) |
| 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 |
|---|---|
| Functional bores | Critical diameters and concentricity requirements (per drawing CTQs) |
| Datum structure | Mounting features aligned to bore datums to ensure assembly fit |
| Surface finish | Controlled finish on functional areas (as specified) |
| Documentation | CTQ inspection report + traceability for receiving |
| Schedule | Prototype/pilot quantities with clear delivery expectations |
How we executed
SEMIX approached the build as a controlled workflow: confirm CTQs, plan measurement methods, and prevent revision drift.
- Contract review: confirmed functional CTQs, datum strategy, and finish boundaries.
- Turn‑mill routing: designed routing to protect concentric relationships and reduce setup error.
- In‑process verification: checked bore features before final machining steps to prevent late rework.
- Inspection plan: mapped CTQs to measurement methods and reported results in a clear format.
- Export-ready packaging: protected functional bores and labeled 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 focused on functional bores and mounting datums
- CoC referencing revision and process scope
- Revision traceability across quote/PO/inspection
- Protective packaging to prevent bore damage and preserve cleanliness
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
- Functional relationships preserved through routing that minimized setup error
- Receiving acceptance accelerated due to CTQ-focused reporting
- Clear assumptions reduced iteration time for follow-up builds
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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Gauge R&R for High‑Precision CNC | Practical Execution (NIST‑Aligned)
How to design Gauge R&R for tight-tolerance machining: artifact selection, fixturing, temperature discipline, CMM strategy, and actions that improve measurement reliability for U.S./EU buyer programs.
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.
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ISO 230‑2 / ISO 230‑4 CNC Accuracy Tests | Part‑Level Risk Control
How to use ISO 230‑2 positioning tests and ISO 230‑4 circular/contouring tests to manage tolerance risk, schedule verification, and prove CNC capability to U.S./EU buyers sourcing CNC machining in Vietnam.
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AS9102 First Article Inspection | Build a FAIR Package That Passes Receiving
Practical AS9102 approach for aerospace CNC suppliers: ballooning strategy, characteristic accountability, evidence pack design, change triggers, and how to reduce receiving rejections with buyer-proof FAIR documentation.
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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