The material rotates over a spindle. A grinding or carving tool would make the shape as it turns. CNC Lathes are used for making symmetrical objects like spheres, cones, or cylinders. Several CNC machines are multi-functionality and Mix all kinds of cutting. The illustrations were being quite interesting, weren’t they? https://reliablecncmachinesforsal78890.ja-blog.com/39130883/cnc-hole-drilling-fundamentals-explained