Engineers are forced to come up with better prognoses for form- ing processes. Therefore, it is important to provide a practical and efficient method to predict deformation behaviours. Sivanandini et al. (2012) describe flow forming generally as an incremental forming process for tubes. One process modification, postulated by Birk (1985), is ball spinning. Similar to a ball bearing, the balls are controlled by a cage (Fig. 1). The diameter of the tube or rod is reduced by the rotating balls and is adjusted by the diameter of the leading ring. This process is applied in the production of cookware, automobile parts and military applications