![]() In other words, the model shows you which direction to go and by how much. There should be a pencil-and-paper approximation that allows you to see which variables are most important and it gets you in the ballpark of the correct dimensions. The functional requirements for flexures include (but are not limited to): desired kinematics, range of motion, stiffness, load capacity, repeatability, mode shapes/frequencies, and an error budget.ĭesigning flexures involves developing a model, using FEA, and experimentally verifying the models. This entry is about understanding the most important parameters for flexure design. These well-designed, well-understood springs can then be implemented in precision machines to allow the development of medical devices and machines for electronic fabrication. Flexures are important for engineers because they allow stiction-less, controlled, limited-range motion. This allows engineers to provide motion in desired directions, but constraint in other directions. The arrangment of beams can be designed to be compliant in its degree(s) of freedom (DOF), but relatively stiff in its degree(s) of constraint (DOC). Contents 1 Introduction 2 Desired Kinematics 3 Concept generation 3.1 Using an old solution 3.2 Constraint-Based Design 3.3 Topological Synthesis 3.4 FACT 3.5 Transmission Theory 4 Range of Motion 5 Stiffness 6 Load Capacity 7 Dynamics 8 Fatigue 9 Repeatability 10 Error Budget 11 Optimization 12 Fabrication 1 Introductionįlexures are bearings that allow motion by bending load elements such as beams.
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