Quality control should follow the product from incoming materials to sealed cartons. Final inspection alone cannot reliably detect hidden moisture, incorrect drilling, weak coating preparation, mixed hardware, or an uncontrolled component change. Buyers should agree a control plan before production.
Incoming and first-piece control
- Verify wood species or material grade, dimensions, moisture, color, and visible defects.
- Check metal thickness, weld condition, fastener grade, rope, plastic parts, coatings, and purchased accessories.
- Approve the first completed piece against drawings, sample, bill of materials, and artwork.
In-process checks
Monitor cutting, drilling, sanding, edge treatment, lamination, welding, surface preparation, coating, curing, and assembly fit. Use gauges or templates for critical hole positions and dimensions. Record defects and segregate nonconforming material so it cannot return to production without disposition.
Final and packaging inspection
Confirm appearance, dimensions, function, stability, hardware completeness, warnings, manual, labels, carton count, gross weight, and pack-out. The sampling plan and acceptance criteria should be written into the inspection instruction. Critical safety or compliance defects require a different response from minor cosmetic defects.
Close the loop
When defects occur, identify the cause, containment, corrective action, owner, and verification result. Trend repeated issues by model and process. A useful QC system produces evidence that helps prevent the same problem on the next order.