Drilling is a cutting process that uses a drill bit to cut a hole with a circular cross-section in solid materials. The drill is usually a rotating cutting tool, often multi-point. The bit is pressed against the workpiece and rotated at speeds of hundreds to thousands of revolutions per minute. As a result, the cutting edge is pressed against the workpiece, which removes chips from the hole during drilling.
Face milling is a machining process in which the milling head is placed perpendicular to the workpiece. The milling head is essentially positioned “face down” towards the top of the workpiece. When engaged, the top of the milling head cuts away at the top of the workpiece to remove some of its material.