Insight 02
Quality control is most useful before mass production has already consumed time, material and supplier capacity. Once a batch is complete, correction becomes slower, more expensive and harder to trace.
For industrial parts, upstream control usually starts with drawing tolerance review, material-grade confirmation, process-route discussion and agreement on inspection standards. The first article then becomes a practical checkpoint: not a formality, but a way to confirm that the process can make the part repeatedly.
This does not mean every project needs the same inspection plan. The right level depends on product type, tolerance, supplier capability and customer requirement. The important point is to make the quality gate visible before production risk becomes shipment risk.