Quality Assurance
From drawing review and manufacturing resource selection to inspection documentation and corrective action, OUJI coordinates the quality requirements of your project throughout the manufacturing process.
Inspection scope, material documentation, critical dimensions, and reporting requirements are reviewed according to the drawing, application, and order agreement.
Clear Responsibility
Manufacturing may involve selected production resources, specialist processors, and third-party inspection services. OUJI remains responsible for technical coordination, production follow-up, inspection expectations, documentation review, and customer communication.
You do not need to coordinate separately with machining suppliers, heat-treatment providers, surface-treatment processors, and inspection services. OUJI consolidates communication and follows the agreed requirements through production and shipment.
Production resources may vary by project. Responsibility for requirement communication and project coordination remains clear.
Before Machining
Many failures begin before machining: an incorrect revision, an unclear tolerance, an unsuitable sequence, or an overlooked finishing risk. OUJI reviews these issues before production is released.
Confirm the latest approved drawing, 3D model, technical notes, and revision status before production.
Review material grade, applicable standard, certificate needs, substitution restrictions, and batch documentation.
Identify tight tolerances, geometric controls, fits, sealing surfaces, threads, datums, and function-critical dimensions.
Review heat treatment, anodizing, plating, coating, grinding, EDM, welding, and their effect on final condition.
Evaluate process sequence, datum transfer, clamping, tool access, thin-wall deformation, distortion, and repeatability.
Define which features need standard measurement, gauges, CMM verification, roughness testing, or third-party inspection.
Requirements that affect price, lead time, inspection scope, or manufacturability should be clarified before production rather than after parts are completed.
Controlled Release
Quality control is not a single final inspection. Each project passes through defined review and verification stages before the next step is released.
Drawing revision, material, quantity, tolerances, surface requirements, special processes, and required documents are reviewed before manufacturing.
Release conditionTechnical requirements are understood and recorded.
The manufacturing resource, equipment type, process route, inspection capability, and special-process arrangement are evaluated for the part.
Release conditionThe selected resource is suitable for the project requirements.
Initial parts are checked for setup accuracy, datum relationships, critical dimensions, appearance, and process stability before production continues.
Release conditionThe manufacturing setup is verified before batch production.
Critical dimensions and process risks are monitored to detect tool wear, deformation, setup movement, or accumulated error before completion.
Release conditionProduction remains within the agreed control requirements.
Finished parts, quantity, appearance, required dimensions, documents, and packaging are reviewed before shipment approval.
Release conditionThe order is ready for documented release and delivery.
A quality gate is not only an inspection step. It is a decision point that determines whether the project can proceed.
Process-Specific Control
A milling part, a turned component, and a sheet-metal assembly should not be controlled in the same way. OUJI reviews risks and inspection methods according to the manufacturing process.
Milled parts often involve multiple datum relationships, repeated setups, deep features, thin walls, and geometric tolerances that require planned control throughout machining.
Inspection depth depends on drawing complexity, tolerance level, quantity, application, and the agreed inspection plan.
Turned parts frequently depend on concentricity, runout, diameter control, thread fit, long-part stability, and alignment between turning and secondary operations.
Multi-process turned parts require particular attention because turning, milling, drilling, heat treatment, and finishing can influence the same functional relationship.
Sheet-metal quality depends on more than profile dimensions. Bend behavior, hole distortion, welding sequence, surface condition, and packing protection can affect final assembly.
Cosmetic, assembly, welding, and packaging requirements should be stated during quotation so the correct control plan can be prepared.
Resource Matching
OUJI does not select a manufacturing resource only according to price. Process, equipment, material experience, tolerance capability, production stability, and inspection resources must match the project.
Is the equipment type, working range, spindle capability, tooling, and setup method suitable for the geometry?
Has the manufacturing resource handled the required alloy, polymer, heat-treated material, or difficult-to-machine grade?
Can the required tolerances and datum relationships be produced and verified consistently?
Can the process remain stable across the required quantity rather than producing only one acceptable sample?
Are heat treatment, coating, grinding, welding, EDM, or other external processes properly coordinated?
Are previous quality, communication, corrective action, and delivery results suitable for the project?
Measurement and Verification
A caliper is suitable for some dimensions. Geometric relationships, surface characteristics, material properties, and critical functions may require more specialized verification.
Typical resourcesCalipers, micrometers, bore gauges, height gauges, pin gauges, thread gauges, and dedicated fixtures.
Typical resourcesCMM, height measurement, runout measurement, surface-plate inspection, and purpose-specific fixtures when required.
Typical resourcesRoughness measurement, visual standards, coating-thickness measurement, controlled lighting, and agreed appearance samples.
Typical resourcesSupplier material documents, hardness testing, process certificates, approved laboratories, and additional verification when required.
Inspection may be completed by OUJI, the selected manufacturing partner, or an approved third-party laboratory, depending on the project requirement and agreed inspection scope.
CMM inspection, full-dimensional reporting, material testing, and third-party verification are not automatically included with every order. Confirm these requirements during quotation.
Documented Evidence
Available records depend on the drawing, application, inspection scope, material requirements, and order agreement. Documentation requirements are confirmed before production.
Records measured results for agreed dimensions and inspection characteristics.
Provides available material grade, specification, heat, batch, or supplier information for the requested certificate type.
Provides structured dimensional verification for complex geometry, geometric tolerances, or first-article approval.
May include heat-treatment reports, hardness results, coating certificates, roughness records, or third-party reports.
Record Control
When project information is recorded consistently, questions can be traced back to the relevant drawing, material, manufacturing source, inspection result, and shipment record.
Creates a consistent internal reference for communication and document control.
Links production and inspection to the approved technical version.
Records available material information according to the project requirement.
Identifies the production resource and relevant external processes.
Connects measured results and supporting documents to the order.
Records quantity, packing condition, and shipment information when required.
Traceability depth depends on the project, material source, quantity, application, and agreed documentation requirements.
When Something Goes Wrong
Manufacturing problems cannot always be eliminated by promises. Credibility comes from identifying the affected scope, communicating clearly, taking corrective action, and reducing the risk of recurrence.
Identify and isolate the affected parts, batch, operation, or shipment to prevent further impact.
Review inspection records, production information, drawing requirements, and traceability to determine the affected range.
Evaluate material, programming, tooling, setup, clamping, machining, handling, external processing, and inspection factors.
Coordinate reinspection, sorting, rework, remake, replacement, or another mutually agreed solution, followed by preventive updates when necessary.
Quality credibility is not the claim that problems never happen. It is the ability to identify them, communicate clearly, and take responsibility for resolution.
The appropriate corrective action depends on the technical issue, affected quantity, application risk, and agreed customer requirements.
Quality in Practice
Multi-Process CNC Turning
A precision turned component may require turning, drilling, secondary milling, and surface treatment. Functional relationships between diameters, holes, and secondary features must remain controlled across setups.
Identify which surfaces and axes control assembly and function.
Arrange machining, finishing, and inspection to limit datum transfer.
Check critical diameters, lengths, runout, thread fit, and feature relationships.
Inspect characteristics that may become difficult to measure later.
Review dimensions, surface condition, documentation, quantity, and packing.
The objective is to verify critical relationships at the stage where they can still be controlled, rather than relying only on final inspection after every operation is complete.
Certification Transparency
OUJI is not currently ISO 9001 certified. Our project controls are based on documented drawing review, manufacturing resource evaluation, inspection coordination, quality records, and corrective action. Customer-specific certificates, inspection reports, and additional verification should be confirmed before production.
Certification status and project-specific evidence are different forms of assurance. OUJI does not use certification logos or claims that do not belong to the company.Direct Answers
Confirm project-specific reports, certificates, and inspection depth before production.
OUJI is not currently ISO 9001 certified. Projects are managed through drawing review, manufacturing resource evaluation, production follow-up, inspection coordination, documentation review, and corrective action. Project-specific reports and certificates should be confirmed before production.
Material certificates can be provided when requested and confirmed during quotation. Please specify the required material standard, certificate type, batch traceability, and whether material substitution is prohibited.
CMM inspection, First Article Inspection, and dimensional reports can be arranged according to drawing requirements, project risk, and the agreed inspection scope. Additional inspection and third-party testing may affect cost and lead time.
Inspection scope depends on drawing complexity, tolerance level, quantity, application, and customer requirements. Critical characteristics are identified during review. Full-dimensional inspection can be arranged when specifically required.
Depending on the project, inspection may be completed by OUJI, the selected manufacturing partner, or an approved third-party laboratory. The required method and documentation should be agreed before production.
OUJI coordinates containment, scope confirmation, root-cause review, and an agreed corrective solution. Depending on the issue, this may include reinspection, sorting, rework, remake, replacement, or another mutually accepted action.
Plan Quality Before Production
Upload your drawing and tell us which dimensions, materials, certificates, inspection reports, surface requirements, and application risks are critical to your project.
Identify dimensions and geometric controls that affect fit, function, or assembly.
Specify material certificates, dimensional reports, CMM reports, FAI, or process documents.
Tell us about functional, cosmetic, environmental, regulatory, or traceability needs.
Clear requirements at the quotation stage help reduce uncertainty during manufacturing and inspection.
