Dimensional Inspection
Size, diameter, depth, thickness and other specified dimensions.
QUALITY CONTROL FOR CNC MACHINED PARTS
CNC Machining Quality Control & Inspection
HongKe plans inspection around the approved drawing, functional datums, critical features and agreed documentation requirements. Critical dimensions and GD&T requirements are reviewed before production to define suitable inspection methods and records.
01IQCIncoming requirement and material review
02FAIFirst completed part against agreed characteristics
03IPQCSelected checks while machining is underway
04OQCFinal checks before approved release
QUALITY AT A GLANCE
Inspection Capabilities for CNC Machined Parts
Inspection methods are selected according to the approved drawing, feature type, tolerance, datum structure and required inspection evidence.
GD&T Verification
Position, flatness, perpendicularity, profile and applicable datum-based requirements.
First Article Inspection
Critical characteristics verified before normal production continues.
In-Process Inspection
Selected features checked during machining to control process consistency.
CMM Inspection
Complex dimensional and geometric characteristics measured where appropriate.
Final Inspection
Approved requirements confirmed before shipment release.
Inspection Documentation
Selected inspection records provided when agreed during quotation.
Traceability Requirements
Traceability scope is defined at quotation based on drawing revision, material, batch and reporting requirements.
APPROVED REQUIREMENTS
Inspection Starts With Approved Requirements
Quality inspection is based on the approved drawing and agreed project requirements.
Drawing Revision & Notes
Approved model, drawing revision, notes and applicable specifications.
Critical Characteristics
Dimensions, datums, mating features and characteristics that affect function.
Material / Finish / Functional Requirements
Material, finish, assembly and functional inputs that affect inspection.
Required Inspection Evidence
Measurements, recorded results and documents required with the order.
BEFORE PRODUCTION
Build the Inspection Plan Around Functional Requirements
Inspection planning turns approved drawing requirements into defined checks, methods and record scope.
- 01
Identify Datum Structure & Function
Map functional datums, mating interfaces and related characteristics.
- 02
Classify Critical & Routine Characteristics
Separate critical dimensions and GD&T from routine measurements.
- 03
Select Measurement Methods
Choose equipment for the feature, tolerance and accessibility.
- 04
Define Inspection Timing & Recorded Evidence
Set FAI, in-process and final checks, sampling and recorded results.
Reviewed tolerance boundary: requirements down to ±0.005 mm apply only to reviewed critical features. Material, geometry, setup and the selected measurement method determine CNC machining feasibility.
FOUR CONTROL STAGES
Quality Control Through the Production Flow
Each stage answers a different question. Inspection equipment supports these stages but is not a separate process step.
- 01IQC
Incoming Quality Control
Review incoming material information and agreed project requirements before machining begins.
- 02FAI
First Article Inspection
Verify the first completed part against selected critical requirements before continuing production.
- 03IPQC
In-Process Quality Control
Check selected dimensions and process characteristics during machining to identify deviation early.
- 04OQC
Outgoing Quality Control
Confirm agreed final inspection requirements before parts are released for packing and shipment.
CONFIRMED INSPECTION EQUIPMENT
Inspection Equipment for Precision Machined Parts
Measurement equipment is selected according to feature type, tolerance, accessibility and the agreed inspection plan.
Complex CMM inspection
Coordinate Measuring Machine (CMM)
For complex geometry and relationships to approved datums.
- Position & datum relationships
- Profile & perpendicularity
- Complex accessible geometry
- REFERENCE CONFIGURATION
- Bridge CMM class
- Measuring range
- 500 × 400 × 400 mm
- Resolution
- 0.0001 mm
- E0,MPE
- (1.7 + 3L/1000) μm
Surface measurement
Height Gauge
For suitable height, step and datum-related checks.
- REFERENCE CONFIGURATION
- Digital height gauge · 0–300 mm range · 0.01 mm resolution
Contact measurement
Micrometer
For selected outside dimensions, thicknesses and accessible features.
- REFERENCE CONFIGURATION
- Outside micrometer · 0–25 mm range · 0.001 mm resolution
Dimensional verification
Caliper
For general accessible dimensions with suitable tolerances.
- REFERENCE CONFIGURATION
- Digital caliper · 0–150 mm range · 0.01 mm resolution
Reference configuration only. Final equipment model, calibrated range and suitability are confirmed for the project.
WHAT WE INSPECT
Verify the Characteristics That Control Part Function
The approved drawing defines the critical features, datum relationships and measurement requirements for each machined part.
Review 5-axis machining capabilitiesLinear & Diameter Dimensions
Length, width, thickness, diameter and depth.
Position & Datum Relationships
Hole position and features relative to approved datums.
Bores, Shoulders & Mating Interfaces
Critical bores, shoulders, mating surfaces and assembly relationships.
Profiles, Faces & Geometry
Profile, flatness, perpendicularity and geometric relationships.
Threads & Secondary Features
Threads, grooves, slots and secondary machined features.
Final Appearance & Quantity
Agreed appearance, quantity and release requirements.
INSPECTION RECORDS
Inspection Documentation Available for Your Project
Inspection records are defined during quotation according to your drawing, critical characteristics and documentation requirements.
Dimensional Inspection Record
Measured values for agreed critical characteristics.
First Article Inspection Record
Selected dimensions and features recorded before normal production continues.
CMM Inspection Record
Results for suitable dimensional and GD&T characteristics.
Measurement Traceability & Calibration
Inspection equipment used for critical measurements is selected according to the approved inspection plan. Calibration status and supporting records can be confirmed where required for the project.
When a Nonconformance Is Found
A measured result outside the agreed criteria is identified and held for review before shipment. Disposition may include further review, rework, remake or another corrective action according to confirmed requirements and applicable internal procedures.
IDENTIFY→HOLD→REVIEW→CORRECT→REINSPECT→RELEASE
EXAMPLE INSPECTION PLAN
How We Would Inspect a Complex Machined Housing
Illustrative example showing how functional requirements can be translated into an inspection plan for a complex machined housing.
Part Requirement
Reference project: Aluminum 7075-T6 housing, 500 pcs; Ø25 H7 bore and position Ø0.10 to A / B / C.
Inspection Planning
Reference sampling — FAI: 1 part; IPQC: 2 parts per 50; OQC: 5-part sample.
Measurement Method
CMM for bore size, position and datums; contact gauges for accessible linear and outside dimensions.
Acceptance Criteria
Rev. C: Ø25 H7 at 25.000–25.021 mm, position within Ø0.10 and agreed records.
QUALITY CONTROL FAQ
CNC Machining Quality Control FAQs
Clarify inspection planning, equipment, reporting and release requirements before quotation.
Start an inspection reviewHow is the inspection plan created for my part?
The inspection plan starts with the approved drawing revision, functional datums, critical characteristics and required evidence. HongKe then selects suitable inspection timing and measurement methods according to feature type, tolerance, accessibility and the agreed project scope.
What does first article inspection cover?
First Article Inspection verifies selected critical characteristics on the first completed part before normal production continues. The exact dimensions, GD&T requirements, sampling and record format are agreed for the project during quotation.
Which inspection equipment is available?
HongKe uses CMM, Height Gauge, Micrometer and Caliper for applicable inspection requirements. Equipment selection depends on feature type, tolerance, accessibility and the approved inspection plan.
Can HongKe inspect GD&T requirements?
HongKe can plan inspection for applicable position, flatness, perpendicularity, profile and datum-based requirements. The drawing, datum structure, feature accessibility and selected measurement method must be reviewed before the inspection approach is confirmed.
Can HongKe inspect features requiring tolerances down to ±0.005 mm?
Requirements down to ±0.005 mm must be reviewed feature by feature. Feasibility depends on material, geometry, feature size, datum strategy, manufacturing process and the selected measurement method. Critical tolerances are reviewed before quotation to confirm both manufacturing and inspection feasibility.
What inspection reports can be provided?
Dimensional inspection, first article and CMM result records can be coordinated when the required characteristics, measurement method, sampling, format and release criteria are agreed during quotation.
What happens if a part fails inspection?
A measured result outside the agreed acceptance criteria is identified and held for review before shipment. Disposition may include further review, rework, remake or another corrective action according to confirmed project requirements and applicable internal procedures.
How are measuring instruments calibrated?
Inspection equipment used for critical measurements is selected according to the approved inspection plan. Calibration status and supporting records can be confirmed where required for the project.
START YOUR CNC MACHINING RFQ
Upload Your Drawing for Engineering & Inspection Review
Send your CAD model, dimensional drawing, material, quantity, critical features and reporting requirements. Our team will review both manufacturing and inspection requirements before quotation.