Tooling Surface Polish Impact on First Article Inspection Accuracy
Uncalibrated optical scans on mirror-polished plastic introduce up to fifteen micrometers of false elevations, ruining First Article Inspection accuracy.
First Article Inspection Sign Off
Meaning
Formal verification procedures confirm that the first parts from a new or modified mold meet all engineering specifications. A first article inspection sign off marks the transition from the tool sampling phase to full scale manufacturing. This step requires a full dimensional layout and material property verification.
It protects the molder from the cost of producing thousands of non-conforming parts.
Quality Benchmark
Measurements taken during this stage become the master reference for all subsequent production runs. Every dimension on the drawing is checked against the physical part produced under stabilized process conditions. If a first article inspection sign off is granted, these values represent the best achievable results from the current tool and resin combination.
Production Release
Approval from the customer or quality manager triggers the start of commercial shipments. The first article inspection sign off ensures that any tool adjustments or process tweaks are finalized before the machine begins high volume cycles. Bypassing this stage risks the rejection of entire lots.
Documentation Control
Records of the inspection provide a technical history of the part. This documentation includes the certificate of analysis for the resin and the specific settings of the injection molding machine. Maintaining a first article inspection sign off file allows for troubleshooting if the process drifts in the future.