This paper is about the selection of the optimum position of the driving system and the analysis of the load at that position in order to safely drive an object with heavy load on the turret with a linear actuator. Usually, linear actuator is required the greatest force when first lifting or pushing a structure, and it is determined by the initial angle and positions. After all, the optimal position of the linear actuator in a limited turret space is closely related the required load and driving performance of the linear actuator. Therefore, this paper contains the contents of securing the driving stability and performance at optimum position on the turret by considering the two cases of linear actuator position arrangement.

Recently, the reliability are applied for many industrial products, and many products are required to guarantee in quality and in performance. The purpose of this paper is to present some of reliability prediction methodologies using failure rate database

Recently, the reliability are applied for many industrial products, and many products are required to guarantee in quality and in performance. The purpose of this paper is to present some of reliability prediction methodologies using failure rate database for machinery parts that are applicable to machine tools. VDI Turret, which is core component of the NC Lathe, was chosen as the target of the reliability prediction. The results of reliability prediction has shown the failure rate, MTBF(Mean Time Between Failure), and reliability of the VDI Turret. It is expected that proposed methodologies will be applicable to prediction of reliability for other components of machine tools.