Influence of Machining Accuracy of Links on Dynamic Response of Planar Mechanisms

In the paper the influence of machining accuracy of mechanism links on their dynamic response is under investigation. As an example a of planar slider-crank mechanism is studied. The influence of different cross-section area within the assumed tolerance on the dynamic behaviour of mechanism’s connection rod is investigated. For vibration analysis of links the finite element method is used with Bernoulli-Euler beam elements. The calculation were conducted for nominal dimensions of the cross section of the crank and for the two cases for connecting rod: 1) for the maximal stiffness and 2) for the minimal stiffness obtained within the given tolerance. The results of analysis show that the changes in dynamic response for different cross-sectional area of mechanism links, within the assumed tolerance of machining, can be quite significant in the case of high-speed precise mechanisms and manipulators.