The abundant literature and the ease of design and manufacturing makes the flexure hinges an inevitable choice for the FTS system. It acts as a visualization tool for designers to analyze the deflection of flexure mechanisms which is more simplified and accurate. ( 8) becomes a bridge between the classical rigid-body mechanism theory and compliant mechanism analysis. Alternatively, a parametric approximation model called the Pseudo-Rigid-Body Model (PRBM) introduced by Howell et al. However, this mathematical approach is difficult to use and only provides little insight about the motion or stiffness of the beam. Mathematical approaches such as the elliptical integrals has been used to analyze end-loaded large deflection cantilever beams in order to obtain closed-form solutions ( 4). Also, symmetric arrangement of flexure hinges helps in avoidance of thermal expansion of the mechanism, thus maintaining the axis-normal assembly and actuation of the FTS system. In the design of the guiding mechanism, systematic and symmetric arrangement of the flexure hinges provide constrained motion along a particular motion without any parasitic motion errors. Flexure-based design has traditionally been evolved on creative thinking and engineering intuitions which is considered a designer's delight ( 8). Though the flexure-based mechanisms are delimited by their output displacement, they are extensively incorporated in applications such as FTSs, due to their high quality motion attributes which are otherwise impossible or difficult to achieve using conventional rigid-body mechanisms ( 4). Higher off-axis stiffness to withstand tangential cutting forces. Reduced cost, but increased precision and reliability and Reduced part count making the manufacturing process simpler and avoidance of assembly-prone errors įriction-free motion and theoretically no wear.The main advantages due to which flexure hinges are used in the design of FTS guiding mechanism are Flexure has various advantages which are discussed in detail in most of the literature ( 4– 7). Flexure mechanisms obtain all or most of its motion by elastic deformation of the flexures about its slender cross-section and store energy in the form of strain energy. Flexure-based mechanisms are the most commonly used mechanical guiding mechanism in an FTS system. Flexures are the most commonly used element in the design of precision components such as nanopositioners and microgrippers for Hi-Tech applications including scanning probe microscopy, lithography, nanometrology, beam steering for optical communication systems, fabrication and assembly of nanostructures, handling and manipulation of micro-objects, microassembling, machining, and in manipulation of flexible and fragile biological micro-objects such as cells and bacteria in biotechnology ( 1– 3).
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