The material rotates on the spindle. A grinding or carving tool tends to make the shape as it turns. CNC Lathes are used to produce symmetrical objects like spheres, cones, or cylinders. A lot of CNC machines are multi-purpose and combine all types of cutting. The examples were fairly intriguing, https://cncmilling91234.bloguetechno.com/the-ultimate-guide-to-cnc-profile-division-74848732