Journal
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
Volume 28, Issue 3, Pages 338-357Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.precisioneng.2002.12.001
Keywords
kinematic coupling; quasi-kinematic coupling; plastic deformation; exact constraint; fixture; repeatability; stiffness; assembly; photonics; automotive assembly; over constraint; precision optics
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A quasi-kinematic coupling (QKC) is a fixturing device that can be used to make low-cost assemblies with sub-micron precision and/or sealing contact. Unlike kinematic couplings that form small-area contacts between mating balls in v-grooves, QKCs are based on arc contacts formed by mating three balls with three axisymmetric grooves. Though a QKC is technically not an exact constraint coupling, proper design of the contacts can produce a weakly over constrained coupling that emulates an exact constraint coupling. This paper covers the practical design of QKCs and derives the theory that predicts QKC stiffness. A metric used to minimize over constraint in QKCs is presented. Experimental results are provided to show that QKCs can provide repeatability (1/4 mum) that is comparable to that of kinematic couplings. (C) 2004 Elsevier Inc. All rights reserved.
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