Metrology Equipment Relocation Baseline Verification Metrics
Establishing pre-move kinematic baselines and dynamic transit logs prevents unassigned structural drift when re-commissioning relocated precision metrology systems.
Dynamic Probing Error
Meaning
Transient deviations occur during high-speed contact or non-contact sensing operations due to inertial forces on the scanning head. In coordinate metrology, dynamic probing error represents the positional discrepancy that arises when the probe is moving during a measurement point acquisition. The error increases with the scan speed and acceleration.
It includes the effects of structural deflection and sensor response delay.
Deflection Mechanism
Inertial resistance of the stylus assembly generates bending moments during deceleration. This deflection causes the physical tip to lag behind the reported scale position. Bending increases with the length and mass of the stylus holder.
Velocity Influence
Higher scanning speeds reduce the contact dwell time and exacerbate the lag. This dynamic probing error grows non-linearly when the scanning speed approaches the natural frequency of the machine structure. It limits the practical throughput of automated inspection routines.
Compensation Scheme
Software correction utilizes dynamic models of the probe arm and stylus to adjust the recorded points based on instantaneous acceleration. The parameters are typically derived from reference sphere scans performed at different speeds. Applying these dynamic offsets reduces the residual scanning uncertainty without requiring mechanical modifications, and it allows the system to maintain accuracy across various scan trajectories.