Rotating unbalance is a major cause of vibration in rotating machinery. One of the new methods used to control and reduce the unbalance is use of automatic dynamic ball balancer. In previous researches comprehensive studies have been done on the dynamic behavior and stability of automatic ball balancer, however there is no research has been done on determining the optimum values of the system parameters. Harmful forces caused by the unbalance in the system causes unwanted vibration and malfunctions of the system, therefore reducing the time of balancing is necessary. In this study, the effect of damping ratio and the mass of balls of the automatic dynamic ball balancer on the stability and the balance of system have been investigated. Moreover, for the first time the optimum values of these parameters to minimize the balance time are obtained. The results show that the optimal choice of the system parameters reduces the balance time considerably.