Kinematic Couplings Pwering Silicon Valley San Jose State 运动学耦合动力硅谷圣若泽州立.pptVIP

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Kinematic Couplings Pwering Silicon Valley San Jose State 运动学耦合动力硅谷圣若泽州立.ppt

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Kinematic Couplings Pwering Silicon Valley San Jose State 运动学耦合动力硅谷圣若泽州立

Kinematic Couplings Gus Hansen Phil Wayman Sunny Ng Agenda Coupling Definition Methods of Coupling Kinematic Coupling Design Critical Design Issues Compliant Kinematic Couplings Conclusion What is a “Coupling” For the purposes of this discussion, a “coupling” is a device with the following characteristics: A coupling connects two parts or assemblies It can be separated and rejoined at will The resulting connection will have some level of stiffness. The specific locating features of the connection will result in some level of accuracy and repeatability. Methods of Coupling Pin/Hole Method Elastic Averaging Method Quasi-Kinematic Method Planar-Kinematic Method Kinematic Method Pinned Joints Advantages A seal between the coupling components Disadvantages Jamming Wedging = high assembly/mfg cost “Slop” = component relative location not uniquely defined. Repeatability ↑ Tolerance↑ Elastic Averaging Advantage: Capability of withstanding high loads Large amount of contact area allow for a stiff joint design. Better repeatability than pin joint Disadvantage: Grossly over constrained Susceptible to surface finish contaminants Repeatability requires an extended period of “wear-in” Quasi-Kinematic Coupling Advantage = Disadvantage Near kinematic Improve load capacity over K.C. Not as over constraint as Elastic Averaging Less sensitive in placements of their locating features = mfg. cost lower Planar Kinematic Coupling Extension to QKC Mixed nature of coupling Large contact surface with line or point to constraint degrees of freedom High stiffness and load capacity Good repeatability Kinematic Coupling Advantage Low cost Sub-micron repeatability Less sensitive to contamination Disadvantages High stress concentration Does not allow for sealing joints Methods of Coupling Kinematic Coupling History: (from “Optimal Design Techniques for Kinematic Couplings”, L.C. Hale, A.H. Slocum) James Clerk Maxwell (1876, 3-vee) Lord Kelvin (“Kelvin Clamp”) Professor Robert Willis (~184