Author(s)

J. Singh, M. Hughes & J.N. Petzing

Abstract

Multi-axis Measurement Arms (MMAs) are a unique subset of Coordinate Measuring Machines (CMMs). They incorporate a large number of degrees of freedom and compact design based on multi-element arm construction, which provides tremendous versatility of movement and access around an object being measured. The consequences of the flexibility of the MMAs is that the volumetric accuracy and repeatability specifications are substantially inferior to those of more traditionally designed CMMs. The work reported here has examined in detail the volumetric performance of a 'Faro Bronze Series' Multi-axis Measurement Arm, with repeated systematic measurements of a calibrated reference sphere. The results show that regions of poor accuracy, repeatability and variance occur within the measurement volume, and these

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