MILLING at a glance _

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Introduction

In this operation the workpiece is fed against a rotating cylindrical tool. The rotating tool consists of multiple cutting edges (multipoint cutting tool).

Milling operation is distinguished from other machining operations on the basis of orientation between the tool axis and the feed direction, however, in other operations like drilling, turning, etc. the tool is fed in the direction parallel to axis of rotation.

Milling operation

Classified as peripheral milling and face milling.

1.Peripheral Milling

 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.

 Type of peripheral milling operations

    1.lab Milling

    2.Slotting

    3.Side Milling

    4.Straddle Milling

Peripheral milling is also classified on the basis of the   rotational direction of cutter, as up milling and down milling.
 Up Milling 
It is also called conventional milling in this case movement of cutter teeth is opposite to the direction of feed motion.
Down Milling
It is also called climb milling. In this case direction of cutter motion is the same so that of direction of feed motion.

2.Face Milling
In the operation of face milling, axis of the milling cutter remains perpendicular to the surface being milled. In this case cutting action is done by cutting edges of both sides (end and out side) periphery of the milling cutter.

different types as

1.Partial FaceMilling

2.End Milling

3.Profile Milling

4.Pocket Milling

5.Surface Contouring

Type of Milling Machines

1.Column and Knee Type Milling Machine
(a) Head milling machine
(b) Plain milling machine
(c) Universal milling machine
(d) Omniversal milling machine
(e) Vertical milling machine
2.Fixed Bed Type Milling Machine
(a) Simplex milling
(b) Duplex milling
(c) Triplex milling
3.Special Type Milling Machine
(a) Rotary table milling
(b) Drum milling
(c) Planetary milling
(d) Tracer controlled milling