The Wheel Projection is a type of mechanical engineering that involves the use of two components: a CAM and a COG. A CAM is a rotating or sliding piece in a machine that, by its shape, controls the motion of another part. A COG is a wheel with teeth that meshes with another toothed wheel to transmit motion. Together, these two components are used to create a wheel projection, which is a mechanism that converts rotary motion into linear motion.