The parts produce through milling operations are automobile engine blocks and automobile cylinder heads, open-end wrenches and other hand tools, gearboxes, brackets, ribs, fittings, flanges, spars, beams, pumps, printing presses, machine tool components, aircraft parts, etc. Milling is a machining operation in which a work part is fed past a rotating cylindrical tool with multiple cutting edges (in rare cases single-edge cutting tool called a fly cutter). The axis of rotation of the cutting tool is perpendicular to the direction of feed. The cutting tool in milling is called a milling cutter. The machine used to do this operation is called a milling machine. The milling process produces plane, form, or profile surface geometry.
If a large amount of material is required to remove from the stock, then using the milling process is an efficient method to produce flat surfaces and slots. Milling machine operations are generally more beneficial, when close fittings are required between moving parts or when sealing is involved, or when an accurate fit is expected. The degree of precision of parts obtained from the milling process is much better than the same parts obtained by other processes such as casting, forging, and extrusion. The parts produce through milling operations are automobile engine blocks and automobile cylinder heads, open-end wrenches and other hand tools, gearboxes, brackets, ribs, fittings, flanges, spars, beams, pumps, printing presses, machine tool components, aircraft parts, etc. One more common application is milling of the surface before surface grinding