... Speed20000rpm Collet diameterØ3.175-Ø12.7 About drive systemsXStepper motor(1)85BYGH450B,,Xiaoyan Branddrive-MD-2278(0.32A-7.80A ... ) Leadshine YStepper motor(2)85BYGH450B,,Xiaoyan Branddrive-MD-2278(0.32A-7.80A ... ) Leadshine ZStepper motor(1)85BYGH450B,,Xiaoyan Branddrive-MD-2278(0.32A-7.80A ...