Through modelling it is found that the torque value attains 4000Nm with arm and hammer speed of 0.6º/s and 0.05m/s respectively with including arm3 whilst the torque arrives 480Nm with 5º/s and the same hammer speed of 0.05m/s with kinetic energy of only hammer. The torque has been the least of 80Nm at 30º/s with one kinetic system. Meantime the one may be 620Nm at 4 º/s with two kinetic system. That means that the least torque is formed through the biggest speed and hammer kinetic system. For the cost declining the less torque may be adopted and for the security the bigger one may be chosen. In this paper the less one is a factor for the cost declining. It is found that the effect turn is angular speed being bigger than hammer speed. So we shall pay more attention to the former. The angular speed is smaller the torque is higher.