➤ What is measurement?
➤ Inline and offline measurement
➤ Measurement tools and equipment
➤ Gd&T -- What do these symbols mean?
➤ How to evaluate your results? -- CPK
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Inline measurement refers to the process of measuring parts or products directly within the production line. Instead of removing items for inspection, sensors or vision systems collect measurement data in real time as manufacturing continues.
Key characteristics of inline measurement:
Real-time feedback for process control.
High efficiency, no need to stop production.
Ideal for high-volume manufacturing and applications requiring continuous quality assurance.
Often relies on 3D machine vision, laser sensors, or automated metrology systems.
Detects deviations immediately.
Reduces waste by preventing defective batches.
Improves process stability and throughput.
Enables closed-loop manufacturing systems.
Offline measurement takes place outside the production line, usually in a quality lab or inspection room. Products or samples are taken from the line and measured with high-precision equipment such as CMMs (Coordinate Measuring Machines), optical profilers, or other specialized metrology tools.
Key characteristics of offline measurement:
Higher accuracy than inline systems.
Allows for complex geometries and detailed analysis.
Often slower and may interrupt production if inspection is required before release.
Typically used for critical components or sampling-based inspection.
Ensures compliance with tight tolerances.
Provides traceable, highly accurate measurement data.
Supports product validation and certification processes.
Useful for first article inspection (FAI) and R&D.
