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Additional resources for Advances in Mechanism Design II: Proceedings of the XII International Conference on the Theory of Machines and Mechanisms

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2f ¼ pH ¼ pb sffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi À  Á f 2 q y  Æ 1 q y   pðd1 þ d2 Þ1 qy 2 qy  ð3Þ Unlike the positive radius of curvature of the roller follower 1ρy, the radius of curvature of the cam surface in contact 2ρy may attain both, positive or negative values. Actually this fact is defined in relation (3) by quantity |2ρy|. d1;2 ¼ 1 À l21;2 E1;2 Fig. 2 Contact of cylindrical bodies with parallel axes and pressure distribution in contact ð4Þ 46 M. Hejnová and J. Ondrášek The quantities δ1, δ2 are the characteristics of elasticity of the elements in the pair (4), where the Poisson’s ratio and the modulus of tension elasticity are denoted as μ1,2 and E1,2 respectively.

Lovasz et al. Fig. 2 Gripping Device Using Four-Bar Linkage The geometrical parameters of the gripping device using four-bar linkages are shown in Table 2 and the design assembly was patented in [15]. Figure 4b shows the variation of the absolute axial centering deviation for the four-bar linkages. The centering condition is fulfilled for four radii of the grasped cylindrical object. For these radii the four-bar linkage was computed by using four pose synthesis in [1, 14]. 4 Conclusions The paper presents a general algorithm for computing the absolute axial centering deviation, as theoretical precision parameter.

ASME J. Mech. Des. 126(1), 83–92 (2004) Life Estimation of the Contact Surfaces M. Hejnová and J. Ondrášek Abstract A life estimation of the contact surfaces is an important part of the cam mechanisms design. The aim of this article is to compare available methods of the life estimation. Every theory has its own experimental constants. Their influence on the resulting life estimation is considerable. The real life of the contact surfaces can be markedly different according to used theory. A solving can be to refine the theories.

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