Optical CMM Gauge Capability Evaluation for Sub Millimeter Molded Features
Optical CMM capability on sub-millimeter molded features requires material-specific bias correction and telecentric backlighting to maintain GR&R under 20%.
Master Artifact Calibration
Meaning
High precision tools with known physical dimensions serve as the reference against which other measuring instruments are compared. Performing master artifact calibration ensures that the measurement data from the factory floor is traceable to national standards.
Reference Standard
Certified objects such as gauge blocks and ring gauges provide the ground truth for dimensional accuracy. During master artifact calibration, the difference between the instrument reading and the actual size of the artifact is recorded. This offset is then used to correct the readings of the production equipment.
Traceability Link
Unbroken chains of comparisons connect the local tool to a recognized authority like a national laboratory. Every master artifact calibration event must be documented with a certificate that lists the environmental conditions and the uncertainty of the measurement. This documentation is required for industry certifications and quality audits.
Measurement Offset
Identification of systematic errors allows for the adjustment of the metrology system before it impacts the product quality. While master artifact calibration does not improve the repeatability of a tool, it removes the bias that causes parts to be measured as too large or too small. Regular updates to these values maintain the accuracy of the production line.