A part can match the CAD model and still fail its intended function if datum relationships, fits, threads or finish requirements are unclear. Quality planning turns those requirements into measurable checkpoints.
Inspection workflow
1. Contract review
Confirm drawing revision, material, quantity, finish, tolerances and any required certificates or inspection format.
2. Measurement plan
Identify critical-to-function features and choose suitable calibrated equipment and sampling.
3. In-process control
Check setup-sensitive features during production so correction is possible before a full batch is completed.
4. Final release
Verify required characteristics after relevant secondary processes and assemble the agreed records.
Documents to request
| Document | When it helps | RFQ instruction |
|---|---|---|
| Dimensional report | Critical dimensions or first production lot | Mark reportable characteristics on the drawing |
| First article report | New part introduction or controlled approval | State the required customer or industry format |
| Material record | Grade or heat/lot traceability matters | Request it before material is purchased |
| Finish certificate | Secondary process compliance | Name the required process standard |
| Certificate of conformance | Purchase-order compliance record | Provide the exact wording or template if controlled |
Measurement strategy
Calipers and micrometers are efficient for accessible size features. Height gauges, indicators, gauges, optical systems and coordinate measurement may be selected for datum-related or complex geometry. The method must match the tolerance and feature definition.
Revision control
- Place a revision identifier on both the model package and drawing.
- Avoid sending several similarly named files without identifying the released version.
- Document approved deviations rather than relying on chat history.
- For reorders, state whether the previous revision remains valid.