--- id: "inspection-equipment-en" title: "Inspection Equipment & Quality Validation | Zhongde Precision" description: "Zhongde validates critical dimensions, GD&T requirements and assembly function through CMM, optical, hardness, torque and axial-clearance inspection." source: "/en/quality/inspection-equipment" language: "en" generated: true --- # Critical Dimensions Must Be Measured Accurately, and Final Function Must Be Verified CMM Inspection · Material Verification · Assembly Function Validation Zhongde selects inspection methods according to drawing CTQs, datum relationships, tolerance levels and product function. Beyond dimensional and geometric inspection, hardness, torque and axial-clearance checks are used to confirm actual functional requirements. - Two Mitutoyo CMMs verify critical dimensions, datums and GD&T - Methods are selected according to CTQs, tolerances and part geometry - Hardness, torque and axial clearance confirm assembly function ## Key Figures - 2 Units · Mitutoyo CMM - Dimension · GD&T · Profile Inspection - Hardness · Torque · Clearance Validation - CTQ · SPC · Data Traceability ## 01. What We Validate From part dimensions, GD&T and profiles to material condition, assembly clearance and operating torque, Zhongde defines inspection plans according to drawing CTQs and final functional requirements. Dimensional conformity is the foundation; assembly and functional results are the final validation. ### Capabilities and Engineering Points #### 01. Dimensions & GD&T Verify individual dimensions and geometric relationships between multiple datums. - Equipment and Workshop: CMM and general measuring instruments - Applications: Housings, flanges, bearing seats, locating structures and complex precision-machined parts ##### Engineering Points - Hole and shaft diameters - Hole location and position - Flatness and perpendicularity - Coaxiality and parallelism - Spatial relationships between datums #### 02. Profiles & Fine Features Use optical methods for fine features that are difficult to access with a CMM probe. - Equipment and Workshop: Optical profile projector - Applications: Thin-wall parts, small precision components, stamped or machined profiles and complex edges ##### Engineering Points - 2D profiles and projected dimensions - Slot width, radius and angle - Fine holes, slots and edge features - Complex sections and local geometry - Machined profile consistency #### 03. Material & Process Condition Dimensional conformity alone does not confirm material or heat-treatment condition. - Equipment and Workshop: Hardness testers - Applications: Aluminum alloys, steels, stainless steels, heat-treated and surface-hardened parts ##### Engineering Points - Material hardness - Heat-treatment condition - Surface-hardening effect - Batch hardness consistency - Condition before and after machining #### 04. Assembly & Functional Results Confirm expected function through torque, clearance and operating-condition validation. - Equipment and Workshop: Torque tester and axial-clearance tester - Applications: Robot joints, bearing assemblies, rotating mechanisms and precision modules ##### Engineering Points - Rotational torque - Axial clearance - Assembly play - Bearing preload condition - Mechanism running resistance - Fit and assembly results ### How Inspection Methods Are Selected The method is not determined by equipment alone. It is defined by CTQ type, tolerance level, datum system, part geometry and final function. #### Process Steps ##### 01. Drawing Requirements Confirm tolerances, datums and specifications ##### 02. Identify CTQs Determine critical dimensions and functional risks ##### 03. Select the Method Match suitable equipment and measurement techniques ##### 04. Validate Function Confirm drawing and application requirements ## 02. Inspection Equipment & Applicable CTQs Zhongde selects inspection equipment according to CTQ type, tolerance level, datum system and product function. Different systems validate dimensions and GD&T, 2D profiles, material hardness, torque and axial clearance. Equipment quantity is only the foundation; reliable results depend on matching the correct method to each CTQ. ### Equipment and Workshop #### Mitutoyo Coordinate Measuring Machine The primary system for validating complex 3D dimensions, datum relationships and GD&T during first-article and critical-CTQ inspection. - Quantity: 2 Units - Applications: Housings, flanges, bearing seats, robot-joint structures, liquid-cooling parts and complex precision components ##### Critical Quality Characteristics - Hole and shaft diameters - Hole location and true position - Flatness and perpendicularity - Coaxiality and parallelism - Spatial relationships between datums - Complex three-dimensional geometry ##### Execution Stages - First Article - Process Validation - Final Inspection #### Optical Profile Projector Optically validates 2D profiles, angles and fine features that are difficult to access with a contact probe. - Quantity: 1 Unit - Applications: Thin-wall parts, small precision parts, stamped or machined profiles and complex edge geometry ##### Critical Quality Characteristics - 2D profile dimensions - Slot width, radius and angle - Fine holes and edge features - Machined-profile consistency ##### Execution Stages - First Article - In-Process Check - Final Inspection #### Hardness Testers Confirms that material, heat-treatment and surface-hardening conditions meet drawing and process requirements. - Quantity: 2 Units - Applications: Aluminum alloys, steels, stainless steels, heat-treated and surface-hardened components ##### Critical Quality Characteristics - Material hardness - Heat-treatment condition - Surface-hardening result - Batch hardness consistency ##### Execution Stages - Incoming Inspection - Process Validation - Final Inspection #### Push-Pull Force Testing Machine Uses tensile, compression and push-pull loading to evaluate press-fit force, pull-out force, retention force and assembly joint strength. - Quantity: 1 Unit - Applications: Connectors, press-fit assemblies, snap-fit structures, terminals and precision assembly modules ##### Critical Quality Characteristics - Press-fit & pull-out force - Retention force - Assembly joint strength - Load consistency ##### Execution Stages - Assembly Validation - Functional Check #### Axial-Clearance Tester Validates axial clearance, end play and preload results in shafts, bearings and rotating mechanisms. - Quantity: 1 Unit - Applications: Bearing assemblies, shaft systems, robot joints, rotating mechanisms and precision assemblies ##### Critical Quality Characteristics - Axial clearance and end play - Axial movement - Bearing preload condition - Assembly clearance ##### Execution Stages - Assembly Validation - Functional Check ### Matching CTQs to Inspection Equipment One component may require multiple inspection methods. Final quality should not be judged with a single instrument alone. #### Engineering Items - Applicable CTQ: 3D dimensions and datum relationships - Equipment and Workshop: Coordinate measuring machine - Applicable CTQ: 2D profiles and fine features - Equipment and Workshop: Optical profile projector - Applicable CTQ: Material and heat-treatment condition - Equipment and Workshop: Hardness tester - Applicable CTQ: Rotational torque and operating resistance - Equipment and Workshop: Torque tester - Applicable CTQ: Axial clearance and assembly play - Equipment and Workshop: Axial-clearance tester ## 03. Inspection Planning & Validation Workflow Inspection planning starts from product function and combines CTQs, datum systems and quality risks to define the measurement method, fixture, measurement points, inspection frequency and record requirements. The objective is to produce comparable and traceable results that support release and improvement. First define why the measurement is needed, then decide what, how and when to measure. Reliable inspection results come from the combined control of equipment, methods, datums, environment and personnel—not from equipment brand alone. ### Process Steps #### 01. Review Drawings & Function Requirement list and preliminary risk assessment ##### Engineering Points - Confirm drawing revision and specifications - Understand product use and assembly relationships - Identify critical fits and final functions #### 02. Identify CTQs & Datums CTQ list, measurement datums and acceptance criteria ##### Engineering Points - Identify critical dimensions and GD&T - Define assembly and measurement datums - Confirm hardness, torque and clearance requirements #### 03. Select Method & Equipment Inspection equipment and measurement method ##### Engineering Points - Match equipment to tolerance level - Assess probe and optical accessibility - Determine whether functional validation is required #### 04. Define Fixture, Points & Program Measurement program and work instruction ##### Engineering Points - Determine part orientation and locating method - Build datums and measurement paths - Define measurement and repeat-check points #### 05. Validate the First Article First-article report and validation record ##### Engineering Points - Confirm program and datum stability - Repeat critical and abnormal measurements - Verify consistency with assembly function #### 06. Set Frequency & Records Inspection plan and record requirements ##### Engineering Points - Set incoming, first-article, process and final checks - Define checks after tool or setup changes - Establish CTQ records and traceability ### Four Controls for Reliable Measurement Results #### 01. Equipment Condition ##### Engineering Points - Valid calibration status - Accuracy matched to tolerance - Daily checks completed #### 02. Datums & Fixturing ##### Engineering Points - Datums aligned with the drawing - Stable locating and clamping - Part deformation and movement avoided #### 03. Method & Personnel ##### Engineering Points - Controlled measurement programs - Standardized operating methods - Trained inspection personnel #### 04. Environment & Records ##### Engineering Points - Controlled temperature and cleanliness - Results linked to production batches - Abnormal results remain traceable ## Inspection Results and Quality Records Inspection results are linked to drawing revisions, part batches, inspection equipment, inspection dates and acceptance decisions to maintain traceable and reviewable quality data. ### Inspection Result Coverage Results cover dimensional accuracy, material and process status, assembly function and in-process quality evidence. #### 01. Dimensional and GD&T Results ##### Engineering Points - Measured dimensions - Tolerance decision - CMM inspection results #### 02. Material and Process Results ##### Engineering Points - Hardness values - Heat-treatment status - Nonconformity records #### 03. Assembly and Functional Results ##### Engineering Points - Torque results - Axial clearance - Functional confirmation #### 04. Process Quality Data ##### Engineering Points - FAI and patrol records - CTQ trend data - SPC / CPK when applicable ### Deliverable Quality Records Relevant inspection records and quality reports are provided according to customer requirements, CTQ level and production stage. #### 01. First Article Report Records first-article results, acceptance status and review information. #### 02. Dimensional Record Records measurements, specifications, tolerances and decisions. #### 03. CMM Inspection Report Records datum relationships, GD&T results and key deviations. #### 04. Hardness Test Record Records hardness values and related material or process status. #### 05. Torque and Clearance Record Records torque, axial clearance and functional measurement results. #### 06. Nonconformity Record Records deviations, corrective actions and reinspection results. ### Important Note Report format, inspection scope and submission frequency are defined by customer requirements, CTQ level, production stage and project agreement. Not every order includes every report by default. ## RFQ Requirements and FAQ ### 05. Information for RFQ and Inspection Review Complete drawings, CTQ definitions and reporting requirements help confirm inspection feasibility, cost and deliverable scope before production. More complete information enables earlier confirmation of the inspection method, frequency and reporting scope during quotation and engineering review. #### Engineering Items ##### 01. 2D Drawings and 3D Models Used to review dimensions, tolerances, GD&T and measurement accessibility. ##### 02. Drawing Revision Records Identify the current valid revision and relevant engineering changes. ##### 03. CTQs and Functional Requirements Identify critical dimensions, fits, hardness, torque and clearance. ##### 04. Datum and Acceptance Criteria Define design, assembly and measurement datums and acceptance rules. ##### 05. Quantity and Inspection Frequency State sample or production quantity and FAI, patrol or final inspection needs. ##### 06. Report and Special Requirements Define report format, specified equipment, points or repeated measurements. ### 06. Frequently Asked Inspection Questions Answers to common questions about CMM reports, inspection scope, frequency and measurement-result differences. #### Engineering Items ##### Can Zhongde provide a CMM inspection report? Yes. According to drawing requirements and project agreement, reports may include critical dimensions, datum relationships, GD&T results and acceptance decisions. ##### Are all dimensions inspected 100%? Not necessarily. Inspection scope is determined by CTQ level, dimensional risk, production stage, volume and customer requirements. Critical characteristics may be inspected 100%, while other features may use FAI, patrol inspection or sampling. ##### How is inspection frequency determined? Frequency is determined using tolerance level, process stability, tool or line changes, equipment adjustment, production volume and historical quality data. ##### Can a customer submit samples for independent inspection? The request can be evaluated after confirming the inspection items, datum system, acceptance criteria, sample condition and reporting requirements. ##### How are different measurement results investigated? The drawing revision, datum definition, fixturing, equipment, environment and measurement program are reviewed before disputed features are remeasured and compared. ##### Can SPC, CPK or measurement-system validation be provided? For stable production programs and critical CTQs, SPC, CPK and measurement-system validation can be evaluated according to project requirements. The scope is confirmed during project review.