Dimensional Tolerance Detection
Accurate detection from ±0.002mm to ±0.05mm, covering conventional dimensions, micro slits, hole positions and assembly matching tolerances
Quality Control
Precision Quality Control | Strict Machining Parts Inspection & Quality Assurance
We provide on-demand custom CNC machining services, covering turning, milling, EDM, wire-cutting and other processes. We produce precision metal and plastic parts from prototype to mass production.
Full-process quality control system with ISO-standard inspection, ensuring high precision, zero defects and full batch consistency for custom machined parts.
Drawing to production
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QUALITY / CONTROL
Quality Control Overview
Quality is controlled from incoming material to final delivery, not left to random end-of-line inspection.
IQCMaterialVerify incoming material identity and condition before machining.
IPQCProcessControl CNC, EDM and finishing risks throughout production.
OQCReleaseConfirm drawing requirements, packaging and release records before shipment.
View complete quality-control scope
We implement a standardized full-process quality control system covering IQC raw material inspection, IPQC in-process monitoring, FQC finished product inspection and OQC pre-delivery audit. Equipped with complete high-precision testing equipment and a professional QA/QC team, we strictly control dimensional tolerance, surface finish, material performance and batch stability of all custom precision components. All orders are supported by official inspection reports and material certificates to deliver reliable, qualified and traceable precision machining solutions.
Quality control is the core foundation of precision machining manufacturing. Different from ordinary random inspection, our quality management mechanism runs through the entire production workflow, from raw material incoming, CNC machining, EDM wire cutting and surface finishing to final packaging and delivery. We eliminate defective risks through standardized processes, professional testing and strict judgment standards, ensuring every custom part meets drawing tolerances and industrial application requirements.
Every drawing requirement becomes a recorded inspection and release condition.
QUALITY / CONTROL
Quality Control Features
Selected control evidence
Strict Raw Material Source Control
Conducts material grade, hardness and appearance verification for all incoming materials to intercept unqualified raw materials from the source.
Inspection record
Requirement
Measured result
Release status
QUALITY / CONTROL
Quality Control Capabilities
FULL TRACEABILITY
One inspection chain from material receipt to shipment release
IQC
Material identity and incoming condition
Recorded release condition
FAI
First article and drawing benchmark
Recorded release condition
IPQC
In-process stability and patrol inspection
Recorded release condition
FQC
Finished dimensions and surface quality
Recorded release condition
OQC
Documents, packaging and release
Recorded release condition
Surface Roughness Inspection
Testing range Ra 0.2μm–Ra 6.3μm, applicable to mirror finishing, fine grinding, wire cut and conventional machining surfaces
Material Performance Verification
Material composition, hardness and physical property testing to ensure full consistency with customer-specified grades
Geometric Tolerance Testing
High-precision inspection of flatness, parallelism, verticality, position degree and concentricity for precision assembly parts
Surface Defect Inspection
Full inspection for burrs, scratches, dents, oxidation, discharge marks and processing deformation
Batch Inspection Standard
100% full inspection for ultra-precision parts; high-standard sampling + random spot check for mass production orders
Deliverable QC Documents
Dimension inspection report, material certificate, surface quality report and full quality audit data
QUALITY / MATERIAL
QC Standards for Common Machining Metals
We formulate differentiated and targeted inspection specifications according to the physical characteristics, processing performance and application scenarios of different metal materials. Strict multi-dimensional inspection ensures stable precision, qualified surface quality and consistent mechanical performance of all machined parts.
Identity
Condition
Performance
Surface
Material Type
Aluminum
Focus on dimensional stability, zero processing deformation, uniform anodizing layer effect and surface oxidation resistance; strictly inspect no scratches, dents or surface burrs.
Common Grades
6061, 6063, 7075, 5052
PROCESS
Core Inspection Procedures
Active inspection gate: IQC
IQC Raw Material Incoming Inspection
Verify material grade, hardness, appearance and flatness for all incoming metals. Unqualified materials are strictly rejected to eliminate source quality risks.
IQC
Requirement confirmed
Measurement recorded
Release decision
Traceable inspection traveler
QUALITY / INSPECTION
Professional Testing Equipment
We are equipped with a full set of calibrated high-precision testing instruments to support micron-level inspection for all custom machined parts, ensuring accurate, stable and traceable test data.
Calibrated measurement station
Selected inspection equipment
Hexagon CMM
- No.
- 1
- Equipment accuracy
- 0.002
- QTY
- 1
- Measuring range
- 800*1000*600
QUALITY / EQUIPMENT
Inspection Equipment Applications
Coordinate Measuring Machine (CMM)
Specializes in high-precision 3D inspection of complex curved surfaces, spatial profiles, hole position degree and geometric tolerances for molds and automation precision parts.
2.5D Image Measuring Instrument
Efficiently detects 2D micro-precision dimensions such as plane profiles, micro slits, apertures and chamfers, ideal for batch inspection of wire cut and ultra-thin precision parts.
Surface Roughness Tester
Accurately quantifies surface roughness values, verifies various surface finishing effects, and ensures consistent surface quality for batch components.
Hardness Tester
Tests post-heat-treatment hardness of steels and alloys, verifies mechanical performance and structural stability to ensure service durability.
Precision Micrometer & Caliper
Provides high-precision verification of conventional dimensions, wall thicknesses and spacings for daily sampling and full inspection of all machined parts.
Height Gauge & Flatness Tester
Accurately detects flatness, parallelism, verticality and height tolerances to ensure precise fitting and stable assembly of structural parts.
Component families
Industry Application & QC Standards
Our standardized quality control system adapts to high-standard precision manufacturing requirements across multiple industries, delivering zero-defect and high-consistency custom parts
Selected component family
Mold & Die Industry
Strict tolerance and surface control for mold inserts, punches and profiling parts to ensure long mold service life and stable batch production quality.
Select an industry scenario to review the matching application context.
Discuss an Industry Quality Plan
QUALITY / SYSTEM
Our QC System Advantages
Quality system evidence
Source control, measured release and permanent traceability in one system.
100%
full inspection for ultra-precision parts
Permanent
quality data archive
Source Quality Interception
Strict incoming material inspection eliminates unqualified raw materials and avoids fundamental material quality problems.
Full-process Closed-loop Supervision
Multi-layer inspection mechanism of FAI, IPQC and FAI realizes zero-dead-end quality control.
Micron-level Detection Accuracy
Complete high-precision testing equipment ensures all inspection data is accurate, objective and credible.
Customizable Inspection Standards
Formulate exclusive QC plans according to customer drawing tolerances and industry application standards.
Stable Batch Consistency
Unified processing and inspection standards effectively reduce dimensional and appearance differences in mass production parts.
Permanent Quality Traceability
All inspection reports and test data are archived permanently to support customer quality audits and full lifecycle traceability.
QUALITY / CONTROL
ZHD Precision Quality Control Guidelines & Specifications
Active quality chapter
Agreement, incoming and first article release
Drawing agreement
Confirm Drawing Benchmarks Before Production
Verify key tolerances, assembly benchmarks and inspection standards with customers in advance to avoid judgment deviation
Incoming control
Strict Batch Raw Material Verification
Inspect grade, hardness and appearance for every material batch; prohibit unqualified materials from production
First article release
Mandatory First Article Confirmation
All new orders and batch reproduction require full first article inspection before mass production startup
Precision Quality Control | Strict Machining Parts Inspection & Quality Assurance Articles
Read recent technical articles related to this service before preparing your RFQ.
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CNC Machining for Cast Industrial Housings: What Buyers Should Check
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Can you provide official inspection reports?
Yes. We provide standardized dimension inspection reports, material certificates and surface quality reports for all formal orders to support customer acceptance and quality review.
What is your maximum inspection precision?
Our professional testing equipment supports ultra-precise detection up to ±0.002mm, meeting high-end mold and ultra-precision component inspection standards.
Do you inspect 100% of finished parts?
We implement 100% full inspection for ultra-precision key parts and small-batch prototypes, and adopt high-standard sampling inspection for large-batch production.
Can you customize QC standards per drawing?
Yes. We formulate exclusive tolerance grading and inspection rules strictly according to your CAD drawings, tolerance marks and industry requirements.
How do you handle defective parts?
All non-conforming parts are strictly isolated, recorded and reworked or remade for free to ensure zero defective delivery.
Can you verify material authenticity?
Yes. We conduct hardness testing and material composition verification to ensure materials fully match customer-specified grades.
How to control surface defects?
Multi-stage surface inspection is carried out during processing and after finishing to eliminate burrs, scratches, oxidation and marks.
Is all inspection data traceable?
Yes. All test records and quality documents are permanently archived to realize full lifecycle quality traceability.
Will surface finishing affect part dimensions?
We reserve finishing tolerance in advance and perform re-inspection after post-processing to ensure final dimensions fully meet standards.
Project inquiry
Send your CAD drawings and precision requirements to get standardized quality control solutions and accurate machining quotations.
We provide full-process quality assurance and complete inspection reports, ensuring 100% qualified and stable delivery for all custom precision parts.