Milling Machine
Milling is the process of removing metal by feeding the work past
against a rotating multipoint cutter. The metal is removed in the form
of small chips. In milling operation the ratio of metal removal is rapid
as the cutter rotates at a high speed and has many cutting edges thus
the jobs are machined at a faster rate than with single point tools and
the surface finish us also better due to multi cutting edges. It is used
for machining flat and irregular surface.
Milling operation
1. Plain or slab milling
Plain
milling is the operation of producing flat horizontal surface parallel
to the axis of the cutter using a plain milling cutter.
2. Face milling
The
method of producing flat surface on the which is at the right angle to
the axis of rotation of the cutter is called as face milling.
3. Angular or bevel milling.
It
is the operation of machining a flat surface at an angle other than the
axis of the revolving cutter. The cutter used may be a single or double
angle cutter depending upon whether a single surface is to be machined
or two mutually inclined surfaces simultaneously.
4. Straddle milling
Straddle
milling is the operation of producing two vertical flat surfaces on
both sides of the job by using two side milling cutters which are
separated by collars. Straddle milling is very commonly used for milling
square and hexagonal surfaces.
5. Gang milling
Gang
milling is the production of many surfaces of a job simultaneously by
feeding the table against a number of required cutters. The two plain
milling cutters have helical teeth of opposite hands. This method of
operation saves machining time and hence it is widely used in mass
production.
6. Form milling
Form
milling is the operation of producing irregular surfaces or contours by
using required form cutters. The irregular shape may be convex, concave
or any other shape.
7. End milling
It
is the operation of producing both peripheral and face milling
operation simultaneously generates vertical, horizontal or angular
surfaces by using a end milling cutter. It is used for milling slots,
grooves, keyway etc.
8. T slot milling
Milling
of t-slots is produced in two or three stages. In the first operation,
the end milling operation or a plain slot is made by using an end
milling cutter.
In the second operation. T-slot is made by using the t-slot cutter to enlarge the slot and to mill the bottom face of the slot.
9. Gear cutting
the gear cutting operation involves cutting of different types of gears on a milling machine.
It
is performed by using a form relieved cutter which is having the
profile corresponding to the required tooth shape of the gear. Equally
spaced gear teeth are cut on a gear blank by holding the work on a
universal dividing head and then indexing it.
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