Milling Operation

Jul 5th, 2016
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types of milling machines

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TC 9-524Chapter 8MILLING OPERATIONSMilling is the process of machining flat, curved, orirregular surfaces by feeding the workpiece against a rotatingcutter containing a number of cutting edges. The millingmachine consists basically of a motor driven spindle, whichmounts and revolves the milling cutter, and a reciprocatingadjustable worktable, which mounts and feeds the workpiece.Milling machines are basically classified as vertical orhorizontal. These machines are also classified as knee-type,ram-type, manufacturing or bed type, and planer-type. Mostmilling machines have self-contained electric drive motors,coolant systems, variable spindle speeds, and power-operatedtable feedsTYPES OF MILLING MACHINESKNEE-TYPE MILLING MACHINEKnee-type milling machines are characterized by a verticallyadjustable worktable resting on a saddle which is supportedby a knee. The knee is a massive casting that rides verticallyon the milling machine column and can be clamped rigidly tothe column in a position where the milling head and millingmachine spindle are properly adjusted vertically for operation.The plain vertical machines are characterized by a spindlelocated vertically, parallel to the column face, and mounted ina sliding head that can be fed up and down by hand or power.Modern vertical milling machines are designed so the entirehead can also swivel to permit working on angular surfaces,The turret and swivel head assembly is designed for makingprecision cut

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