Final answer:
The main difference lies in the applications and the design of the milling cutters used; Face Milling is for large flat surfaces, End Milling for slots and pockets. Face Milling cutters have teeth on the periphery and face, while End Milling cutters may have teeth only on the periphery.
Step-by-step explanation:
The main difference between Face Milling and End Milling is that Face Milling is used for milling large flat surfaces, whereas End Milling is used for milling slots, pockets, and contours. Face Milling uses a milling cutter with teeth on both the periphery and on the face of the cutter for efficient material removal over large areas. In contrast, End Milling primarily uses a milling cutter with teeth at the end and optionally along the sides, known as flutes, to produce detailed and complex shapes more so than flat surfaces.
The correct answer to the question is therefore option 1) Face Milling is used for milling large flat surfaces while End Milling is used for milling slots and pockets. Additionally, option 3 also contains a correct statement: Face Milling uses a milling cutter with teeth on the periphery and on the face, while End Milling has teeth only on the periphery. However, this option does not capture the primary applications of each process as precisely as option 1 does.