Far from the comfort of metrology labs where qualified inspectors operate digital CMMs with stable granite tables, portable measurement is still facing major challenges. Users of portable measurement solutions in production environments are faced with many issues, including: • Permanent vibrations generated by equipment • Requirements for rigid equipment setups • Changes in temperature and humidity • Operators’ varying experience REDUCING THE IMPACT OF VIBRATIONS In production environments, vibrations can be transmitted to the measuring system and the object being measured. For example, a CMM in a factory with stamping presses had vibrations of up to 0.2 mm with a frequency of 17 Hz at a distance of 50 ft. From the press. TRUaccuracy technology developed by Creaform features dynamic referencing. It enables the measuring device to be continuously locked to the part by an optical link. To test the performance of TRUaccuracy, an experimental setup was used to expose Creaform’s HandyPROBE optical CMM and a coordinate measuring arm to the same level of vibrations. • Without vibrations: results obtained for the arm and optical CMM were similar. • Results with vibrations clearly showed the advantage of dynamic referencing, with no notable degradation for the HandyPROBE, compared with an increase of errors—by a factor of three—for the arm. REDUCING THE IMPACT OF THE OPERATORS CMSC’s study, How Behavior Impacts Your Measurement, provides a detailed analysis of operator behavior in the metrology process. One of the study’s conclusions is that human error is a major factor in poor quality measurements. Dynamic referencing contributes to reducing some of the human errors identified in the CMSC study. With an optical CMM, it is possible, using specialized tools, to position certain targets on points required for improved alignment quality, eliminating operator errors, regardless of skill level. TRUaccuracy technology increases measurement reliability and device portability. It also makes the process less dependent on operators. Moreover, it ensures quicker reactivity during production increases, earlier detection of drift, and faster identification of causes. This results in significant productivity gains without costly equipment or measurement environments.
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