The shaking of the Rotary forging machine has an important influence on the life of the equipment parts machining accuracy and surface profile of parts, reducing the production efficiency. This paper proposes a method to reduce shaking by changing eccentricity，obtained the design relationship of internal and external sleeves eccentricity, which can reduce the shaking in rotary forging press. This study improving the working state of the rotary forging machine and economic benefits.

We sometimes meet the problem of linkage synthesis for 4 specified orientations. For example, we need to design an automobile seat based on spherical 4R linkage to move the driver to the ground. According to the traditional Burmester theory, most of the linkage solutions have motion defects, which lead to low computational efficiency. In this paper, a program package was developed under Matlab, which can quickly locate the feasible linkage solution under the guidance of solutions map.

To better help the mechanical design and structural optimization of bridge-type nano-positioners, an improved model was developed to describe the displacement amplification of the bridge-type mechanism in this paper. Comparative studies and experiments indicate that the proposed method can better capture the amplification performance for such systems, which can be potentially used in the design and optimization of bridge-type nano-positioners.

the joint clearance error of the component is an important component for the structural parameter errors. In order to improve the accuracy of such mechanism, the possible errors were evaluated and on-line error compensation was carried out by control system for the purpose of accuracy machining. The error model of the working accuracy of the parallel mechanism was established in this paper.