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Milling machine
Milling machine
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A Milling machine is a power-driven machine used for the complex shaping of metal (or possibly other materials) parts. Its basic form is that of a rotating cutter or mill bit which rotates about the spindle axis (like a drill), and a worktable that can move in multiple directions (often three dimensions relative to the workpiece, whereas a drill can only move in one dimension while cutting). The motion across the surface of the workpiece is usually accomplished by having a movable table on which the workpiece is mounted, arranged to move in two dimensions. Milling machines may be operated manually or under computer numerical control (see CNC).
A horizontal mill has the same sort of X-Y table, but the cutters are mounted on a horizontal arbor across the table. Cutters, called side mills, have a cross section like a circular saw, but are generally wider and smaller in diameter. These are used to mill grooves and slots. Plain mills are used to shape flat surfaces. Several cutters may be ganged together on the arbor to mill a complex shape of slots and planes. Special cutters can also cut grooves, bevels, radii, or indeed any section desired. These specialty cutters tend to be expensive.
Milling machines can perform a vast number of complex operations, such as slot cutting, planing, drilling, rebating, routing, etc.
Cutting fluid is often pumped to the cutting site to cool and lubricate the cut, and to sluice away the resulting swarf.
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