Requalification Protocol Execution for Relocated Multiaxis Measurement Jigs
Requalification of relocated multiaxis measurement jigs mandates thermal soak, 21-parameter laser kinematic mapping, and ISO 10360 volumetric acceptance signoff.
ASME B89.4.22
Meaning
Dimensional inspection standards establish standardized evaluation procedures for articulated arm coordinate measuring machines. Adherence to ASME B89.4.22 provides standardized testing metrics to quantify length measurement capability and point repeatability on portable measurement arms. The scope of this standard applies strictly to articulated arm structures and excludes fixed Cartesian coordinate frames.
Verification Sequence
Calibration protocols require measuring calibrated artifact lengths and ball-bar gauge points throughout the reachable volume of the arm. Testing under ASME B89.4.22 mandates single-point articulation tests alongside volumetric length measurements. Standardized probe movement paths isolate joint encoder errors from structural flexure.
Documented deviation vectors confirm whether the portable arm meets manufacturer specifications.
Uncertainty Assessment
Point repeatability evaluations generate statistical spread metrics across varied joint angle combinations. Using ASME B89.4.22 ensures that operator handling variations do not mask underlying mechanical encoder hysteresis or link deflection. Volumetric length tests measure distances between precision spheres located across multiple spatial quadrants.
Test results establish traceable expanded uncertainty figures for shop-floor quality documentation.
Environment Boundary
Temperature gradients and environmental thermal changes degrade structural geometry during extended measurement routines. Compliance with ASME B89.4.22 requires logging ambient thermal conditions during test execution. Thermal compensation algorithms adjust length values based on material expansion coefficients.
Uncontrolled thermal fluctuations invalidate the standard test sequence and require full recalibration.