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Milling is a process of removing material with a rotating multiple-tooth cutting tool called a milling cutter. In the usual operation,the work piece is fed against the rotating cutter. The common operations performed on milling machine are:slot keyways,. Cut gear teeth,mill screw threads, cut irregular shapes,cut helical shapes,cut helical flutes etc.

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Diagram of milling machine

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There are two basic types of milling machines,the names are below: o Vertical Milling machine o Horizontal Milling machine

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Vertical milling machine The vertical milling machine is so named because the spindle is located vertically and at a right angle to the surface of the table. The spindle has vertical movement,and the table can moved in 3 axis(X,Y and Z).Both the table and spindle movement can b controlled by manually or power. Vertical milling machine can use for face milling milling dies and locating and boring holes.

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Horizontal milling machine The horizontal milling machine can be recognized by its horizontal spindle. The cutter is mounted on a horizontal arbor and is rotated by supplying power. The work table can be fed in a longitudinal, cross or vertical directions. This type of machine is generally used for surface milling, profile milling, gear cutting etc.

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Milling operations Milling operation is broadly classified as peripheral milling and face milling.

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Peripheral Milling This operation is also called plain milling operation. In this operation axis of rotating tool is always kept parallel to the surface being machined. This operation is done by the cutting edges on outside periphery of the milling cutter.

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Slab Milling A milling process that uses the slab mill that rotates on an axis parallel to the work piece. Slab milling produces flat surfaces.

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cutter

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Side Milling A milling process in which a cylindrical milling cutter having teeth on the circumferential surface on both sides.

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cutter

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Straddle Milling It is just like side milling with difference that cutting (milling operation) takes place simultaneously on both the sides of work piece.

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cutter

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Face Milling A cutting process that uses a mill to cut a flat surface by positioning the tool at a right angle to the work piece.

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cutter

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End Milling A milling process that uses the sides and end of an end mill to cut a variety of shapes.

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cutter

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Pocket milling This is a selective portion milling on the flat surface of work piece used to make shallow packets there.

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Gang milling Gang milling refers to the use of two or more side milling cutters mounted on the same arbor (that is, ganged) in a horizontal-milling setup.

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cutter

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Slot milling The process of making a slot into the work piece with the help of slotting cutter

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Form milling A milling process that uses a mill with a unique shape that is imparted to a work piece.

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cutter

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Thanks