Measurement of a fully compliant statically balanced rotational compliant mechanism

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Measurement of a fully compliant statically balanced rotational mechanism in an Instron 5966 tensile test bench. Two opposing constant torque mechanisms are preloaded against each other causing dramatically different states of stiffness. The video shows the transition from a high stiffness to a low stiffness configuration. The mechanism and measurement results are described in detail in the following paper: • Title: Compliant Mechanisms that use Static Balancing to Achieve Dramatically Different States of Stiffness • Abstract: Stiffness in compliant mechanisms can be dramatically altered and even eliminated entirely by using principles of static balancing. This requires elastic energy to be inserted before operation, which is most often done with an additional device or preloading assembly. Adding such devices contrasts starkly with primary motivations for using compliant mechanisms, such as part count reduction, increased precision and miniaturization. • Very few compliant mechanisms with different states of stiffness and a fully monolithic architecture exist. In this paper we design two novel fully compliant statically balanced mechanisms with a preloading mechanism monolithically integrated. Allowing full benefits of compliant mechanisms including miniaturization. • The mechanisms have rectilinear and rotational kinematics and work by opposing constant force and torque. Constant force and torque mechanisms based on a linear buckling analysis are used. Preloading is reversible and is done by a bistable mechanical switch. The mechanisms can change stiffness dramatically by moving them in their motion direction with high force. • EDIT: STL files are published at thingiverse: https://www.thingiverse.com/thing:476... • The paper can be accessed in two ways: • 1. https://doi.org/10.1115/1.4049438 • 2. https://www.researchgate.net/profile/... (Request full-text PDF at research gate)

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