Stama 531 Twin² 4-spindle vertical machining center Stama 531 Twin² four spindle vertical machining center Innnovative manufacturing solutions result from customers' demanding problems, like the STAMA 4-Spindle Center: a highly productive solution in very little space which is efficient, dynamic and flexible. The advantage: torque technology for the 4th and 5th axis, powerful spindles and ideally prepared for automation solutions. With the large tool magazines with 4 x 14 and 4 x 30 spaces, workpieces with complex machining and long individual operations are perfectly suited to the 4-Spindle Center.