tailieunhanh - TC 9-524 Chapter 8 MILLING OPERATIONS

Milling is the process of machining flat, curved, or irregular surfaces by feeding the workpiece against a rotating cutter containing a number of cutting edges. The milling machine consists basically of a motor driven spindle, which mounts and revolves the milling cutter, and a reciprocating adjustable worktable, which mounts and feeds the workpiece. Milling machines are basically classified as vertical or horizontal. These machines are also classified as knee-type, ram-type, manufacturing or bed type, and planer-type. Most milling machines have self-contained electric drive motors, coolant systems, variable spindle speeds, and power-operated table feeds TYPES OF MILLING MACHINES KNEE-TYPE MILLING MACHINE Knee-type milling. | TC 9-524 Chapter 8 MILLING OPERATIONS Milling is the process of machining flat curved or Milling machines are basically classified as vertical or irregular surfaces by feeding the workpieceagainst a rotating horizontal. These machines are also classified as knee-type cutter containing a number of cutting edges. The milling ram-type manufacturing or bed type and planer-type. Most machine consists basically of a motor driven spindle which milling machines have self-contained electric drive motors mounts and revolves the milling cutter and a reciprocating coolant systems variable spindle speeds and power-operated adjustable worktable which mounts and feeds the workpiece. table feeds TYPES OF MILLING MACHINES KNEE-TYPE MILLING MACHINE Knee-type milling machines are characterized by a vertically adjustable worktable resting on a saddle which is supported by a knee. The knee is a massive casting that rides vertically on the milling machine column and can be clamped rigidly to the column in a position where the milling head and milling machine spindle are properly adjusted vertically for operation. The plain vertical machines are characterized by a spindle located vertically parallel to the column face and mounted in a sliding head that can be fed up and down by hand or power. Modern vertical milling machines are designed so the entire head can also swivel to permit working on angular surfaces The turret and swivel head assembly is designed for making precision cuts and can be swung 360 on its base. Angular cuts to the horizontal plane may be made with precision by setting the head at any required angle within a 180 arc. The plain horizontal milling machine s column contains the drive motor and gearing and a fixed position horizontal milling machine spindle. An adjustable overhead arm containing one or more arbor supports projects forward from the top ofthe column. The arm and arbor supports are used to stabilize long arbors. Supports can be moved along the overhead arm .

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