Quality

CNC Machining Quality Control and Inspection

Inspection planning from incoming material to in-process checks, final measurement, key dimension control and export packaging.

Inspection system

Traceable evidence for critical dimensions

Quality work is aligned with the drawing. Critical dimensions can receive extra checks, including 100% checking when required.

ZEISS CMM

Accurate measurement for complex geometries and tight tolerances. Using CMM technology, we verify dimensions, form, and position to ensure every feature matches the drawing — before shipment.

Spectrometer (OES)

All incoming materials are verified by OES spectrometer to confirm grade compliance. Each batch of material is tested against the specified standard (ASTM, DIN, GB, etc.) to ensure chemical composition meets requirements. Test results are recorded and retained for traceability.

Universal Testing Machine

Material strength is verified using a Universal Testing Machine (UTM). Samples from each batch are tested for tensile strength, yield strength, and elongation. Test reports are retained with batch records — ensuring traceability and supporting customer quality review.

Profile Projector

Used for dimensional inspection of complex profiles, contours, and small features. Magnified images are projected on screen for comparison against reference drawings or overlay charts. Suitable for fast, non-contact measurement of precision parts.

Pneumatic Measuring Instrument

Non-contact measurement using compressed air to detect dimensional changes. Eliminates friction and measuring force, preventing surface damage. Ideal for small bores (from Ø1.5mm), deep holes, narrow slots, and thin-wall parts

Hardness Tester

Used to verify material hardness and heat treatment effectiveness. Hardness values are recorded for each batch, providing documented evidence that material properties meet specification.

Inspection planning

Quality control starts with identifying risk on the drawing

For high-precision products, the core of quality control lies in shifting from “final inspection” to “process control.” Precision is not achieved by inspection — it is built into the process and then verified.

Order Review: Identify critical dimensions; verify equipment/gauge capability; define machining plan and inspection methods.
Incoming Material: Confirm grade and composition; verify hardness and tensile strength; inspect blank quality and allowance.
In-Process: First article inspection and record; operator self-inspection; patrol checks / sampling.
Final Inspection: Full dimensional inspection; 100% critical dimension check; visual inspection.
Outgoing: Pre-shipment sampling; packaging verification.

Critical dimensions

0.005 mm tolerance capability requires controlled conditions

When a drawing includes very tight tolerances, the team evaluates whether the material, feature size, clamping condition, temperature, finishing sequence and measurement method can support the requirement.

Metaphoenix GmbH