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Simulation, Modeling and Development of the Metris RCA

Virtual modeling helps improve CMM development.

Mon, 11/16/2009 - 14:52
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In partnership with Metris UK, in this article we will discuss the utilization of modeling and simulation methods in the development of a revolutionary 7-axis Robot CMM Arm (RCA). An offline virtual model is described, facilitating pre-emptive collision avoidance and assessment of optimal placement of the RCA relative to scan specimens. Workspace accessibility of the RCA is examined under a range of geometrical assumptions and we discuss the effects of arbitrary offsets resulting from manufacturing tolerances. Degeneracy is identified in the number of ways a given pose may be attained and it is demonstrated how a simplified model may be exploited to solve the inverse kinematics problem of finding the “correct” set of joint angles. We demonstrate how the seventh axis may be utilized to avoid obstacles or otherwise awkward poses, giving the unit greater dexterity than traditional CMMs. The results of finite element analysis and static force modeling on the RCA are presented, which provide an estimate of the forces exerted on the internal measurement arm in a range of poses.

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