A Synthesis of Planar Mechanisms with Pairs of Optimum Tolerances

Abstract

A systematic synthesis of planar mechanisms with revolute pairs is carried out with consideration given to tolerances of pairing elements. Namely, the optimum tolerances of holes and shafts which constitute revolute pairs in the mechanisms are determined with consideration of variations of clearances of pairs so that the output errors of the mechanisms may be minimized. As a practical example of multilink mechanisms, the optimum tolerances of the pairing elements of planar six-link mechanisms are determined, and it is revealed that the maximum output errors are reduced up to approximately half the level of those of mechanisms which have the same clearances at every pair.