Quality Inspection

Quality inspection cells run the final gate before a part ships or moves to the next station. The robot presents each part to a vision system, laser scanner, CMM probe, or gauge, and the result routes the part to pass, rework, or scrap.

Selection depends on the measurement, not the payload. Vision-only stations run comfortably on a light 6-axis or cobot, contact probing wants a stiffer arm to hold pose against probe force, and non-contact scanning demands stable end-of-arm mounting so the sensor's own calibration isn't fighting arm droop.

Calibration traceability is part of the job. An inspection cell is only as good as its measurement chain, and drift in the robot, the sensor, or the reference artifact can quietly move a cell out of tolerance without setting an obvious fault. Scheduled artifact checks and hand-eye calibration hold the cell honest.

Reject handling belongs in the same cell. If failed parts share a lane with passes, one operator distraction routes bad parts downstream. A dedicated reject bin, chute, or diverter with a positive-confirm sensor keeps the good-part flow clean.

Data logging is expected on any real inspection line. Each part's measurements, pass/fail flag, timestamp, and often an image go into the quality record for traceability. When a customer complaint arrives, the ability to pull the exact part's scan is what closes the investigation.

Common pitfalls: lighting drift that pulls vision measurements without breaking anything, thermal expansion in the fixture that shifts probe reference points over a long shift, and a fail-safe that actually fails open when the sensor loses signal. The last one is the ugly one, because bad parts pass through until the next check catches them.

On the floor: the FANUC M-20iD/25 and ABB IRB 2600 carry 3D scanners and probes at mid-payload, and the Universal Robots UR10e is common on cobot inspection cells where operators load parts. Related: part inspection, bin picking, sorting.