Automated Inspection Cells
Robotised and in-line cells for closed-loop quality control - fixed sensors, robot-mounted scanners and machine-tending robots feeding data straight into SPC and MES.
How it works
An automated inspection cell combines a metrology sensor (structured-light, laser scanner or tactile probe), motion (robot or gantry), part presentation (rotary table, conveyor or machine-tending robot), and software that runs the measurement, evaluates the result and sends conformance data back to the process. Well-designed cells run unattended for full shifts.
Typical accuracy
Cell accuracy is dominated by the sensor, not the robot: a structured-light sensor on a robot typically inherits the sensor's 20-40 micron uncertainty, with the robot providing pose and coverage rather than accuracy. Reference artefacts and photogrammetric tie-in bring cell-level uncertainty into the sensor range.
Applications
- In-line 100% inspection of high-volume parts
- Post-machining SPC without operator involvement
- First-off / last-off automated checks
- Robotic tending of a fixed CMM or scanner
- Closed-loop feedback to machining or welding cells
- 24/7 lights-out inspection alongside lights-out machining
Strengths
- • Removes operator variability from measurement
- • Runs unattended - matches lights-out machining
- • Feeds real-time SPC and MES with structured data
- • Enables closed-loop process control, not just inspection
Limitations
- • Capital and integration cost significant vs manual inspection
- • Requires stable, engineered part presentation and fixturing
- • Change management: cell must be maintained as products evolve
- • Best economics on medium-to-high volume parts
Fixed vs robotised cells
Fixed cells (ATOS ScanBox, Zeiss ScanBox, OGP RoboCell) offer higher accuracy and easier compliance but lower flexibility. Robotised cells with 6-axis arms and interchangeable sensors handle mixed families of parts and are increasingly the default for medium-volume UK manufacturers moving to lights-out inspection.
Closed-loop quality
The commercial value of an automated cell is rarely the labour saving - it's the closed loop back to the process. When SPC results feed CNC offsets, welding parameters or press setup automatically, scrap and rework drop far faster than a human-driven quality function can react.
Buying considerations
- Cycle time vs measurement coverage trade-off
- Sensor choice: structured light, laser, tactile, multi-sensor
- Robot vs gantry vs Cartesian - accuracy, reach and safety
- Data pipeline: OPC-UA, MTConnect, MES/QMS integration
- Safety: light curtains, scanners, cell certification
FAQs
When does automation pay back?+
Typically at part volumes above ~10,000 per year with measurement content over 30 seconds per part, or wherever operator variability is causing scrap. We build honest business cases before recommending automation.
Can we automate our existing CMM?+
Yes - retrofit robots, pallet systems and gantries can turn an existing CMM into an automated cell. We assess whether that's more cost-effective than a purpose-built cell.