Super-Ingenuity (SPI)

CNC Machining & Injection Molding — DFM/Moldflow Support, CMM Inspection, Prototype to Production Solutions.

ISO 9001 & IATF 16949 CERTIFIED
+(86) 0769 8166 7180 / [email protected]
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Quality Assurance System

Quality Assurance in Precision CNC Machining & Injection Molding – ±0.002 mm CMM in China

Partner with an ISO 9001 and IATF 16949–aligned supplier that treats quality as a system, not a final checkpoint. SPI combines Hexagon CMM inspection, SPC with Cpk ≥ 1.67 and digital traceability to keep your engineers and auditors confident.

  • Verified ±0.002 mm on critical CNC features with Hexagon CMMs
  • Audit-ready documentation: FAI/PPAP, CMM reports, material certificates
  • SPC-driven control and digital traceability from material cert to shipment
Request a quality-focused quote

Share your drawings under NDA — we’ll respond within 24 hours with a proposed control plan and CMM inspection strategy.

Our Quality Objectives for Global OEMs

At SPI, we set measurable quality objectives that align with the expectations of global OEMs, Tier-1s and high-mix, low-volume innovators — not just with generic “factory” KPIs.

On-time delivery with full quality documentation

We aim to deliver 100% of orders with complete, accurate quality documents (CMM reports, material certs, packaging photos) that your quality team can directly upload into your QMS.

Zero critical defects in customer production

Our goal is zero critical defects that cause line-stops or recalls at your plant, supported by robust control plans, SPC monitoring and proactive containment when risks are detected.

Long-term stability on CTQ dimensions

For critical-to-quality (CTQ) features, we target Cpk ≥ 1.67 and maintain capability at volume, so your fixtures, assemblies and validation results remain stable over the lifetime of the program.

These objectives translate into fewer surprises for your team, smoother launches and a lower total cost of quality when sourcing CNC machining and molding in China.

What Is Quality Assurance in Precision CNC Machining?

Quality assurance in precision CNC machining is the set of planned processes that ensure every part meets its design tolerances, material specifications and documentation requirements. It combines CMM inspection, SPC monitoring, documented control plans, FAI or PPAP validation and full traceability, so that each batch is repeatable, auditable and ready for use in critical industries.

Inspection & Metrology

CMM Inspection & Metrology Lab Capabilities (±0.002 mm)

Our in-house metrology lab is designed to validate precision CNC-machined and molded parts down to ±0.002 mm on critical features.

±0.002 mm on critical features

Hexagon 3D CMMs

  • Programmable multi-axis inspection for complex prismatic and freeform surfaces
  • GD&T evaluation for position, true position, flatness, perpendicularity, circularity and runout
  • Capability to measure features inside deep pockets and complex 5-axis geometries

Surface and Form Measurement

  • Profilometers for surface roughness (e.g. Ra 0.2–0.8 µm on functional surfaces)
  • Height gauges and granite surface plates for precision height, flatness and parallelism checks

Specialized Gauges & Fixtures

  • Custom gauges for coaxiality and concentricity
  • Plug, ring and thread gauges for threads and fits
  • Dedicated fixtures for repeatable positioning of complex parts

Certified References & Calibration

  • Gauge blocks and reference artifacts for regular verification
  • Scheduled calibration of CMMs and gauges to maintain measurement reliability

By combining CMM inspection with the right gauges, fixtures and calibration routines, we provide traceable, repeatable dimensional inspection that supports your internal audits, PPAP submissions and ongoing supplier evaluations.

SPC & Capability

Beyond Final Inspection: SPC-Driven CNC Process Control

Measuring finished parts is not enough to ensure stable quality at volume. To keep CNC machining and molding processes under control, we build Statistical Process Control (SPC) into our daily operations.

SPC and Capability Targets

  • Identification of critical-to-quality (CTQ) dimensions for each part
  • Capability studies with Cpk ≥ 1.67 targeted on CTQ features
  • Control charts to monitor trends and detect drift before non-conformances occur

First Article Inspection (FAI) and PPAP

  • FAI layouts aligned with AS9102-style requirements or your internal templates
  • PPAP submissions (including Level 3) for automotive and automotive-like programs
  • Validation of process capability before mass production approval

Gauge R&R and Measurement Reliability

  • Gauge Repeatability & Reproducibility (R&R) studies on key gauges and CMM programs
  • Documentation of measurement systems to ensure data quality for SPC and audits

Result: This SPC-first approach reduces scrap, rework and line-stop risk, especially for long-running programs in automotive, aerospace and other quality-critical industries.

Quality Engineering

Our Quality Engineering Team

Behind our systems and equipment is a team of experienced quality and manufacturing engineers.

Our quality organization is led by a dedicated Quality Manager with over a decade of experience supporting automotive, aerospace and industrial customers. This role is supported by:

  • CMM programmers who develop, validate and maintain measurement routines for complex parts
  • Process engineers focused on CNC machining and injection molding process stability and capability
  • Quality engineers and inspectors who own control plans, in-process checks, final inspection and documentation

Together, this team:

  • Reviews each new project for manufacturability and risk
  • Designs control and inspection plans that match your internal requirements
  • Communicates clearly with your engineering and quality teams about issues, improvements and change management

Audit-ready support: We are happy to introduce key team members during audits or kick-off meetings so your stakeholders know who is responsible for your programs.

Project Launch

How We Start a Quality-Controlled CNC or Molding Project

A structured launch process helps avoid surprises later. When you start a project with SPI, we follow a clear, documented sequence.

  1. 1

    Share Your Files Under NDA

    You send us 3D models, 2D drawings, specifications, standards and any internal quality requirements under a signed NDA. We clarify scope, quantities, timelines and special constraints.

  2. 2

    Engineering & Quality Review

    Our manufacturing and quality engineers jointly review tolerances, GD&T, materials and potential risks such as thin walls, tool access, warpage or surface finish conflicts. We may propose adjustments or alternatives.

  3. 3

    Control Plan & Inspection Strategy

    We define CTQ features, sampling frequency, gauges, CMM programs and documentation requirements. Where applicable, we agree on FAI, PPAP level, acceptance criteria and record retention.

  4. 4

    Sample & Validation Run

    We produce first articles or a pilot run, complete the agreed inspection and documentation, and share results with your engineering and quality teams for approval.

  5. 5

    Mass Production & Continuous Improvement

    Once approved, the control plan and inspection plan become the baseline for mass production. SPC monitoring, non-conformance handling and change management keep your program stable over the long term.

Lifecycle Quality

Our End-to-End Quality Process

Our quality process covers the full product lifecycle, not just a single inspection step.

Flowchart of SPI end-to-end quality process from DFM review to continuous improvement
Documented workflow from DFM risk review to continuous improvement — designed for repeatable results at volume.
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  1. 1

    Design for Manufacturability (DFM) & Risk Review

    We analyze your design, tolerances and materials for manufacturability risks and quality sensitivities, documenting concerns and recommendations.

  2. 2

    Control Plan & Inspection Planning

    We define CTQ dimensions, inspection points, sampling plans, gauges and CMM programs before cutting chips or injecting material.

  3. 3

    First Article Inspection (FAI) or Sample Approval

    We run FAI or equivalent sample inspections, compile dimensional reports and validate process stability before approving for volume.

  4. 4

    SPC-Driven Mass Production

    During production, CTQ features are monitored using SPC, with trends and out-of-control conditions triggering investigation and corrective action.

  5. 5

    Final Inspection & Packaging Verification

    Final checks confirm conformity to drawing and control plan, with CMM reports, surface measurements, visual inspection and packaging validation recorded.

  6. 6

    Feedback & Continuous Improvement

    Customer feedback, internal audits and production data feed into continuous improvement actions on process capability, tooling and documentation.

Consistency at volume: This structured process helps ensure that your first batch and your 100th batch perform the same way in your plant.

Digital Traceability

Digital Traceability from Material Certificate to Shipment

We build digital traceability into every job, linking material certificates, work orders, CNC programs, inspection data and packaging photos into a single record that can be retrieved years later.

Incoming Material & Warehouse Records

Every heat lot is tied to its material certificate and to your purchase order. Material grades and standards (e.g. EN, ASTM, JIS equivalents) are recorded and checked before release to production. This documentation supports both customs checks and end-customer audits.

Pre-Production Engineering Control

Before machining or molding begins, our engineers create process sheets that define fixtures, toolpaths, molding parameters, CTQ features and checkpoints. These documents link your drawing and requirements to specific machine and process setups.

In-Process Monitoring

Operators and inspectors log in-process measurements at defined intervals. Data is linked to the specific machine, operator, date and batch. Any trend towards the control limits triggers additional checks and, if needed, temporary containment and engineering review.

Post-Production Verification

For each batch, final CMM layouts, surface roughness measurements and visual inspection results are recorded. Results are tied to the batch number, work order, and, where applicable, to specific serial numbers or cavity identifiers.

Documentation & Long-Term Archiving

All quality records are stored digitally for a defined retention period (typically several years), including reports, photos and change histories. This provides a clear audit trail for OEM quality audits, regulatory submissions and repeat orders.

Risk & Non-Conformance

Risk Management & Non-Conformance Handling

Even with robust systems, issues can occur in manufacturing. What matters is how quickly and transparently they are managed.

RRisk Prevention

  • PFMEA-style reviews on new or complex parts to identify and prioritize risks
  • Control plans aligned with risk levels, with more intensive monitoring on high-risk features and processes
  • Process parameter windows defined and documented to reduce variability

8DNon-Conformance Handling

  • Immediate containment of suspected or confirmed non-conforming parts, with clear labeling and segregation
  • Transparent communication with you about the issue, affected quantity and potential impact
  • Root cause analysis using structured methods such as 8D, 5-Why and fishbone diagrams
  • Corrective and preventive actions (CAPA) documented and implemented, with effectiveness checks

ΔChange & Deviation Management

  • Controlled process for handling engineering changes, tool repairs, material substitutions or process parameter changes
  • Re-validation when necessary, including comparative measurements and sample approvals
  • Documentation of changes and approvals in the job record and change log

Goal: Not only to fix issues, but to prevent recurrence, so each lesson learned strengthens your supply chain.

Delivery Package

What You Receive with Every Order

As a buyer or quality engineer, you don’t just receive parts — you receive a complete quality evidence package that fits into your internal documentation flow.

Shipment-Ready Parts

Parts cleaned, protected and packed according to the agreed packaging standard.

Proof Before Shipment

Packaging photos showing labels, crates and protection before shipment.

Dimensional & Material Evidence

CMM dimensional reports for agreed features, linked to ballooned drawings, plus material certificates for metals and plastics with heat lot and standard references.

Performance & Appearance Checks

Surface roughness and hardness results where applicable, plus visual inspection confirmation and photos when required.

On request: Capability studies, PPAP submissions or special inspection reports can be added for specific projects.

Documentation

Sample Quality Documentation You Can Expect

For many teams, documentation is just as important as the parts themselves. To avoid back-and-forth and rework, we align early on the documents you need and deliver them in a clean, consistent format.

  • 1

    CMM Dimensional Reports

    Structured reports listing each measured feature, nominal, tolerance and actual value, linked to a ballooned drawing for easy cross-reference.

  • 2

    Material Certificates (MTRs)

    Mill test reports showing chemical composition, mechanical properties and relevant standards (e.g. EN / ASTM), linked to heat lots and batches.

  • 3

    SPC and Capability Charts

    Capability studies and control charts for CTQ dimensions, including Cp/Cpk results and sampling details when required.

  • 4

    Surface and Hardness Measurements

    Surface roughness values for functional surfaces and hardness test results when specified.

  • 5

    Visual Inspection Records and Photos

    Records of visual checks against agreed cosmetic standards, supported by photos of representative parts.

  • 6

    Packaging and Labeling Photos

    Documentation of how parts are packed, labeled and protected before shipment.

Optional preview: If you would like to see a redacted sample quality package before starting a project, we can share one under NDA so your team knows exactly what to expect.

Request a sample quality package

We can share a redacted example under NDA, aligned to your program requirements.

Metrology Lab

Our Quality Lab & Inspection Equipment

Our quality lab brings together the equipment needed to validate precision CNC machining and molding work for demanding applications.

  • Hexagon 3D CMMs for high-accuracy dimensional inspection of complex parts
  • Profilometers and surface testers to confirm surface finishes on sealing and sliding surfaces
  • Height gauges, micrometers and bore gauges for fast, accurate checks on the shop floor
  • Custom gauges and fixtures designed specifically for your parts when required

Balanced inspection: By combining a dedicated metrology lab with well-equipped production lines, we can balance speed and depth of inspection so you get both reliable data and practical lead times.

Hexagon 3D coordinate measuring machine (CMM) for high-accuracy dimensional inspection of complex CNC machined and molded parts
Hexagon 3D CMMHigh-accuracy dimensional inspection for complex features.
Image dimension measurement system for fast non-contact dimensional verification and feature checks
Image Dimension SystemNon-contact measurement for quick feature verification.
Profilometer for measuring surface roughness (Ra) on sealing and sliding surfaces
ProfilometerSurface roughness confirmation on functional surfaces.
Tesa height gauge for precision height, flatness and parallelism checks on the shop floor
Tesa Height GaugePrecision height and flatness checks.
Optical magnifying inspection device for cosmetic verification and visual defect checks
Optical MagnifierCosmetic inspection and visual verification.
Thread gauge set including plug and ring gauges for verifying thread fits and tolerances
Screw / Thread GaugesThread fit and tolerance verification.
Hardness measuring machine for verifying material hardness and heat treatment results
Hardness TesterHardness validation when specified.
Outside diameter micrometer for accurate measurement of shafts and cylindrical features
OD MicrometerAccurate checks on diameters and shafts.
Coaxiality measuring machine for verifying concentricity and runout on rotating components
Coaxiality GaugeConcentricity and runout verification.
Nikon Digimicro digital microscope for close-up inspection of surface features and defects
Nikon DigimicroHigh-magnification inspection of details.
Digital microscope for documenting surface features, edge conditions and visual inspection results
Digital MicroscopeDocumentation of visual inspection findings.
Digital caliper for fast shop-floor dimensional checks during in-process inspection
CaliperFast shop-floor checks for in-process control.

Comparison

Quality Assurance Methods: SPI vs Typical Suppliers

Many suppliers rely mainly on calipers, visual checks and basic final inspection. SPI is built for programs where documentation, traceability and long-term stability matter.

The table below compares how typical overseas suppliers handle quality assurance versus SPI’s approach across key aspects such as inspection methods, process control, documentation and traceability. It highlights how we go beyond basic inspection to provide SPC-driven control and complete quality evidence for each shipment.

Suggested table headers: Aspect of Quality Assurance / Typical Overseas Supplier / SPI Quality Assurance Approach

Industries

Industries We Serve and Typical Quality Requirements

Quality expectations vary by industry. We tailor our machining, molding and documentation practices to fit your sector’s specific needs.

Aerospace & Defense

Tight-tolerance aluminum and stainless steel components, often requiring AS9102-style FAI, full traceability, controlled materials and long-term record retention.

Automotive & Commercial Vehicles

Shafts, housings, brackets and structural parts, with IATF-like control plans, PPAP submissions, Cpk targets on safety-critical dimensions and clear traceability.

Medical & Laboratory Equipment

Stainless steel and engineering plastic components where cleanliness, biocompatible materials, consistent cosmetics and traceable documentation support your validation and regulatory processes.

Semiconductor & Electronics Equipment

Precision machined and molded parts for tools and fixtures, often with strict flatness, parallelism and surface finish requirements, and sensitivity to particle generation and contamination.

Industrial Machinery & Automation

High-mix, low-volume components where flexibility, repeatability and quick response to engineering changes are as important as initial launch quality.

Custom Requirements

If your industry has specific standards or documentation formats, we can align our processes to meet them.

Practical fit: Tell us your standards, templates, and CTQ priorities — we will match inspection outputs and documentation to your internal flow.

Case Studies

Cross-Industry Case Studies in Precision CNC & Molding

Real-world projects show how our quality assurance system performs under pressure.

The case studies below summarize how we have supported customers in different industries — from passing stringent qualification audits on the first attempt to maintaining zero returns over many months of production. Each case highlights the combination of process control, documentation and communication required to keep complex programs on track.

These results are not one-off successes, but the outcome of repeatable systems that we apply to every new job.

Why SPI

Why Choose SPI for Quality-Critical CNC and Molding in China

Many suppliers can make parts that “look okay.” SPI is designed for programs where quality documentation, traceability and consistency are business-critical.

QAA Quality Partner, Not Just a Supplier

If you need more than a low-cost supplier — if you need a quality partner in China — SPI is built to support you from first samples to stable mass production, with documentation your team can trust.

Designed for audits: Faster internal approvals, smoother supplier qualification and fewer surprises at volume.

Request a quality-focused quote

Share drawings under NDA — we will align CTQ, inspection outputs, and documentation early.

✓Key Reasons Customers Choose Us

  • CMM + SPC, not just calipers: Hexagon CMM inspection, SPC monitoring and documented control plans to prove performance.
  • End-to-end traceability: Material certs, work orders, CNC programs, inspection data and packaging photos linked per batch.
  • Aligned with global standards: ISO 9001, IATF-like and AS9100-like expectations for smoother audits and approvals.
  • Strong engineering support: Process + quality engineers collaborate on DFM, risk assessment, validation and change management.
  • Suitable for prototypes and volume: Consistent quality and documentation as volumes grow.

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Buyer-Friendly Summary

Key Quality Talking Points for Buyers & Quality Engineers

Use these talking points when you present SPI to your internal stakeholders, sourcing committees or quality teams.

Proven Precision

Precision is verified with measurement systems that match the risk level of the part, not just a quick caliper check.

  • CNC machining validated with Hexagon CMMs; capability to hold ±0.002 mm on critical features where design and process allow
  • Process capability targets (e.g. Cpk ≥ 1.67) on CTQ dimensions

SPC-Driven Process Control

We monitor key features during production to prevent drift, instead of relying only on final inspection.

  • Real-time monitoring of key features during production
  • Early trend detection helps avoid last-minute non-conformances and line-stops

Complete Quality Evidence Package

Documentation is delivered in a consistent format that your team can use without rework.

  • CMM reports with ballooned drawings, material certificates, SPC charts, surface measurements, visual inspection records and packaging photos
  • Structured so your team can upload it directly into your QMS

Digital Traceability & Record Retention

Every job has a retrievable record that links material lots, work orders, inspection data and shipments.

  • Clear links between material lots, work orders, inspection data and shipments
  • Long-term archive for audits, investigations and repeat orders

Transparent Issue Management

When issues occur, containment and communication happen fast, with structured root-cause methods.

  • 8D / 5-Why methods, immediate containment and documented corrective actions
  • Open communication when issues arise, rather than hiding or delaying

Stakeholder-Ready Messaging

These points help show that SPI is a risk-conscious, documentation-strong partner, not just a part supplier.

  • Built to reduce supplier risk and shorten approval cycles
  • Repeatable systems applied to every job, not “hero” efforts

Use internally: Present SPI as a partner that proves quality with data, traceability and disciplined issue handling — not only with parts that look acceptable.

FAQ

CNC & Molding Quality Assurance FAQ

Quick answers to the most common questions buyers and quality engineers ask when qualifying a CNC machining and injection molding supplier in China.

  • Q1 How does SPI prove ±0.002 mm CNC machining accuracy?

    We validate precision using Hexagon 3D CMMs, certified reference artifacts and SPC-driven process control. Critical features are programmed and measured on first articles and sampled during production, with results documented in CMM reports that show nominal, tolerance and actual values. Where required, we also provide capability studies (Cp/Cpk) for CTQ dimensions.

  • Q2 What quality documents do I receive before shipment?

    By default, you receive CMM dimensional reports for agreed features, material certificates and packaging photos. Depending on your requirements, we can also include surface roughness and hardness results, SPC charts, visual inspection records, FAI reports or PPAP submissions. We align the exact package with your quality team during project kick-off.

  • Q3 How do you guarantee consistency in CNC mass production?

    We rely on documented control plans, stable process windows and SPC monitoring of key dimensions. Operators and inspectors record in-process data at defined intervals, and any trend towards control limits triggers additional checks and corrective action. Tool life, fixtures and programs are managed under controlled change procedures to maintain consistency.

  • Q4 How do you control quality for injection molded parts?

    For molding, we control both dimensions and cosmetics. We monitor key molding parameters (mold temperature, fill time, holding pressure, cooling time), check cavity balance and inspect parts for warpage, shrinkage and visual defects such as flash, short shots and sink marks. Validation runs and periodic requalification ensure long-term stability.

  • Q5 How are non-conformances handled?

    When a non-conformance is detected, we immediately contain affected parts, label and segregate them, and determine the scope. We then perform root cause analysis using 8D or 5-Why methods, implement corrective and preventive actions and verify their effectiveness. You receive clear communication and, when needed, formal reports for your records.

  • Q6 How do you protect our drawings and data?

    We work under NDA, control access to sensitive data and limit file sharing to authorized personnel. Engineering data is stored on controlled systems with appropriate access rights. If you have specific cybersecurity or data-handling requirements, we can discuss them during project setup.

  • Q7 Which industries do you support with your quality system?

    Our quality system supports aerospace, automotive, medical, semiconductor, industrial machinery and other sectors with demanding documentation and traceability needs. We adapt our control plans, documentation and validation approach to fit the expectations of each industry.

  • Q8 How long do you keep quality records?

    We maintain digital quality records — such as CMM reports, material certificates, SPC data and photos — for a defined retention period, typically several years. For programs with specific retention requirements, we can align our policy with your internal or regulatory expectations. 

Your business cannot afford quality risks.

SPI delivers not only precision parts, but also the proof and documentation required by global leaders in aerospace, automotive, medical, and semiconductor industries.

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Partner with SPI

Work With a CNC & Mold Manufacturer You Can Audit

Welcome to SPI — an ISO9001/IATF16949-focused CNC machining and injection molding partner in Dongguan, China.

We combine tight-tolerance machining, documented inspection and responsive engineering support to help you move from RFQ to stable production faster, with full traceability and audit-ready quality records.

Share your drawings and requirements — our engineers can suggest practical tolerances, surface finishes and inspection plans before you lock your RFQ.

Go to Contact Us & Request a Quote

Use the Contact Us form to upload STEP/IGES files and add notes about tolerances, surface finish and inspection.

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SPI CNC and mold manufacturing facility in Dongguan, China
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