Meaning
Precision dimensional measurement techniques utilize simultaneous multi-directional probing to capture the coordinate geometry of complex manufactured components. Implementing multi-axis metrology enables the measurement of three-dimensional structures without the need to reposition the workpiece between measurements. This approach improves the accuracy of the baseline measurements used to evaluate the readiness of a machining process for production.
Coordinate Calibration
Calibrating the reference frame of a measurement machine requires precise artifact standards. When using multi-axis metrology, the calibration process must align multiple linear and rotary axes to a single virtual origin. This process ensures that the demonstrated rate of measurement accuracy remains consistent across the entire working volume of the instrument.
It also helps to prevent errors that would otherwise lead to the false rejection of good parts.
Probe Alignment
Sensor orientation must be carefully managed to avoid skew errors during high-speed data acquisition. When multi-axis metrology uses analog probes, the angle of contact with the workpiece affects the recorded dimensions. Proper sensor alignment ensures that the pilot run results are repeatable when transitioned to automated production lines.
Uncertainty Analysis
Measurement uncertainty calculations combine errors from geometric deviations and sensor noise. A complete uncertainty analysis of multi-axis metrology traces the contribution of each axis to the total volumetric error. This step defines the capability of the measurement process to verify tight tolerances on finished products.
