The material rotates on the spindle. A grinding or carving tool makes the shape because it turns. CNC Lathes are used to generate symmetrical objects like spheres, cones, or cylinders. Lots of CNC machines are multi-functionality and combine every type of cutting. Milling CNC machines come in a big selection https://claytonomevl.blogzet.com/5-essential-elements-for-large-batch-production-54281490