Evaluation of Techniques to Capture Nominal Data for Verification and Kinematic Calibration of Articulated Arm Coordinate Measuring Machines

In this work a comparison of different techniques to capture nominal data for its use in later verification and kinematic parameter identification procedures for articulated arm coordinate measuring machines (AACMM) is presented. By using four different probing systems (passive spherical probe, active spherical probe, self-centering passive probe and self-centering active probe) the accuracy and repeatability of captured points has been evaluated. The nominal points are materialized by a ball-bar gauge distributed in several positions of the measurement volume. By comparing these systems it is possible to characterize the influence of the force over the final results for each of the gauge and probing system configurations. The results with each of the systems studied show the advantages and original accuracy obtained by active probes, and thus their suitability in verification (active probes) and kinematic parameter identification (self-centering active probes) procedures.