Manufacturing process
Inspection & Metrology
Inspection and metrology provide measured evidence that parts meet the drawing — from first article inspection to CMM reports, surface roughness checks and capability studies.
Process overview
Inspection and metrology verify that manufactured components conform to specified dimensions, tolerances and geometric requirements. Capabilities may include conventional gauges, optical systems, CMM measurement and other calibrated inspection methods. Projects can require first-article inspection, dimensional reports, measurement plans, traceability and documented acceptance criteria.
Dimensional inspection uses tools matched to the feature and tolerance: hand gauges and height gauges for simple dimensions, coordinate measuring machines (CMM) for complex geometry and GD&T, optical and vision systems for small or delicate parts, and 3D scanning for freeform surfaces. Roughness testers measure Ra, Rz and related parameters, and form testers check roundness and cylindricity.
What matters to buyers is the documented result. A first article inspection report — for example to AS9102 in aerospace, or as part of a PPAP in automotive — records every drawing characteristic; series production may use sampling plans, capability studies (Cp/Cpk) or 100% inspection of critical features. Measurement uncertainty, traceable calibration and a stable, temperature-controlled environment are what make those numbers trustworthy, and ISO/IEC 17025 accreditation is one way laboratories demonstrate this where it is required.
Inspection can be carried out by the part manufacturer or by an independent metrology service, for example to verify incoming parts or to settle a dispute.
Typical capabilities & what manufacturers can produce
What manufacturers can produce
- First article inspection reports
- CMM measurement reports with GD&T evaluation
- Surface roughness and form measurements
- 3D scan-to-CAD comparisons
- Capability studies (Cp/Cpk) and control plans
- Independent incoming or third-party inspection
Capabilities under this process
Relevant industries
Industries whose Metraxio industry guides list Inspection & Metrology as a common process, with the typical use in each.
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Aerospace
CMM inspection and first article measurement.
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Medical Devices
Dimensional inspection and first article reports.
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Pharmaceutical
Dimensional and roughness inspection.
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Semiconductor
CMM and surface inspection.
What buyers should specify
The details that make Inspection & Metrology quotes comparable and let facilities be assessed on the right criteria.
- Drawing and model
- Ballooned drawing if available, and the 3D model for CMM programming.
- Characteristics to measure
- Which dimensions are critical, and whether all or only selected characteristics are measured.
- Report format
- FAI to AS9102, PPAP forms, a customer template or the supplier’s standard report.
- Sampling
- First article only, a sampling plan (for example ISO 2859-1), or 100% inspection of key features.
- Capability targets
- Cp/Cpk requirements for critical characteristics.
- Calibration and accreditation
- Traceable calibration, and ISO/IEC 17025 accreditation if required.
On Metraxio these details become a structured manufacturing requirement. Processes, capabilities, materials, certifications and part size are checked against facility profiles; tolerances, finishes and inspection details travel with your drawings and are reviewed during quoting rather than used as automatic filters.
Frequently asked questions
What is a first article inspection?
A complete measurement of the first production part against every drawing characteristic, documented in a report, to show that the process can make the part as designed.
When do I need a CMM report?
Commonly for complex geometry, tight tolerances or GD&T callouts where hand gauges are not adequate, or when the customer requires measured values rather than pass/fail results.
Can inspection be done by a third party?
Yes. Independent metrology services can inspect parts at the supplier, on receipt, or in their own laboratory.
Start a Manufacturing Project
Upload a drawing or describe what you need. Process context from this page can be reviewed before it becomes a structured requirement.