Keywords

compliant, exure, cross-axis- exural pivot, static balancing

Abstract

This work presents a nondimensional method for statically balancing flexural hinges, including those with stiffness that varies with load. Using a set of non-dimensional parameters, it is shown that one can quickly design a balancing mechanism for an idealized hinge/torsion spring system. This method is then extended to load-dependent systems, and is demonstrated with the design of a balanced cross-axis-flexural pivot with stiffness that varies as a function of compressive preload. A physical prototype is built and tested to verify the design method. The prototype demonstrates an average stiffness reduction of 87% over an 80 degree deflection range. The method enables improved static balancing for systems where the balancing pre-load influences the systems force-deflection behavior.

Original Publication Citation

Merriam, E.G. and Howell, L.L., “Non-Dimensional Approach for Static Balancing of Rotational Flexures,” Mechanism and Machine Theory, Vol. 84, doi:10.1016/j.mechmachtheory.2014.10.006, pp. 90-98, 2015.