CNC machining is a common subtractive manufacturing technique. Unlike 3D printing, CNC typically starts with a solid piece of material and then uses various sharp rotating tools or knives to remove the material to achieve the desired final shape.
CNC turning can produce a wide range of shapes with axial symmetry, like cones, cylinders, disks, or a combination of those shapes. Some turning centers are even capable of polygonal turning, using special rotating tools to create shapes like a hexagon along the axis of rotation.
