Quality and Inspection
CNC Machining Quality Assurance From Drawing Review to Shipment
Quality control begins with the approved drawing, material, critical dimensions, finish and documentation requirements—not with final inspection alone. Formexi plans first-piece, in-process and final checks according to part risk and the agreed order requirements.
1. Pre-Production Control
- Review quotation, purchase order, drawing revision and technical clarifications
- Confirm material grade, condition and required certificate
- Identify critical dimensions, datums, appearance surfaces and inspection documents
- Define process routing, first-piece checks and external finishing controls
2. First-Piece and In-Process Inspection
A first piece is checked before the batch continues where project risk requires it. Inspection frequency is based on tolerance, process stability, quantity and tool-wear risk. Formexi does not describe every dimension on every part as “100% inspected” unless that exact scope is agreed and recorded.
3. Final Inspection and Release
Final checks may include dimensions, threads, appearance, roughness, surface treatment, quantity, documentation and packaging. Only authorized quality personnel may release parts after the agreed requirements are satisfied.
Inspection Methods
| Equipment category | Typical use | Important limitation |
|---|---|---|
| CMM | Complex geometry, position and datum-related dimensions | Method, fixturing and measurement uncertainty must suit the requirement |
| Height gauge and surface plate | Height and reference measurements | Part stability and datum setup affect the result |
| Micrometers, calipers and bore gauges | Accessible linear, diameter and bore dimensions | Not suitable for every complex feature |
| Thread gauges | Functional thread acceptance | Correct standard, class and depth must be specified |
| Roughness tester | Specified surface roughness | Measurement direction and accessible length matter |
Exact models, ranges, calibration status and quantities will be added after the inspection-equipment audit.
Quality Documents
| Document | Availability |
|---|---|
| Standard or full-dimensional inspection report | Available when agreed before production |
| CMM or first article report | Available for reviewed projects |
| Material certificate / MTC | Available when specified and sourced accordingly |
| Certificate of Conformance | Available on request |
| Heat-treatment or finish report | Available when applicable and agreed |
| RoHS/REACH documentation | Dependent on qualified material and treatment evidence |
| PPAP or 8D | Project-specific; not a default deliverable |
Nonconforming Parts and Corrective Action
Suspected nonconforming output is identified and isolated. Confirmed problems are reviewed for containment, responsibility, rework or remanufacture, customer communication and prevention. An 8D or corrective-action report is provided only when the project and issue justify that scope.
Information Buyers Must Provide
Inspection cannot compensate for an ambiguous drawing or requirements disclosed after production. Identify functional dimensions, datum references, cosmetic zones, sampling/full-inspection needs and required reports before order approval.
Standards and Regulatory Sources Used on This Page
For CNC Machining Quality Assurance From Drawing Review to Shipment, these primary sources define the scope of cited standards or regulations. They do not prove Formexi certification, a customer approval or project compliance; those require current, scope-matched records.
Plan Inspection Before Production
Send your drawing and documentation requirements with the RFQ so inspection time, equipment and reports can be included correctly.