Milling machine definition and types


Milling Machine Definition

Milling is a process which is used  multi-tooth cutters, rotating along 
various axes with respect to job. Milling machine includes a number of various machining operations and produces a variety of configuration (shapes). Milling produce a surface by removing the chips. Multi point cutting tool generates the surface in rotating way. It make the profile surface in single pass. It is suited for mass production because of faster production. Due to equally spaced teeth (peripheral) intermittent engagement occurs and hence interrupted cutting. The cycle of operation to remove chip produced by each tooth is first a sliding action at the beginning, the cutter comes in contact with the metal and then crushing action takes place just after it leading finally to cutting action. Milling machine is used to machine flat surfaces, contoured surfaces, complex and irregular area, surface and revolution, slotting, external and internal threads, gear cutting , helical surfaces various cross-section etc.
          In milling, the cutter has a rotary movement, the speed of which depends upon the cutting speed required. Driving the milling arbor at various rotational speeds makes it possible to achieve approximately the same cutting speeds with cutters of different diameters. By milling we can produce flat (horizontal, vertical, angular) and formed surfaces. The choice of a milling machine for a particular work depends on the nature of the work.


  The classification of milling machine is :
        1.   Column and knee type : There 3 types of column and knee types                     which are as given below

(        (a)  Plain/ horizontal milling machine
(b)  Vertical milling machine

(c)   Universal milling machine

2. Fixed bed type

3. Planer type

4. Special type


     The milling machine is normally specified by the :

·       Dimension of the working surface of the table.
·       Longitudinal travel of the table.
·       Cross travel of the table.
·       Vertical travel of the table.
·       Number of spindle speeds.
·       Spindle nose taper.
·       Number of feeds.
·       Floor space area , etc.

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