Difference Between Up Milling and Down Milling

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Today we will discuss about difference between up millingand down milling. The milling is a machining process in which, a rotary cutter iused to remove the material from work piece in the direction perpendicular t the axis of rotation. The milling process is done by the machine, which hold bot the tool and work piece in jig and fixture, known as milling machine. There are two ways to cut the material from the work piece through milling machine. First one is named as conventional milling or Up milling and the other one known as climb milling or down milling. The main and basic difference between up milling and down milling is the direction of rotation of cutter to the feed.

The milling operation is used to facing of those work piece, which are not symmetrical from its axis. It is also used to cut pockets, drill, slot and shape the work piece according to the requirement.

There are two ways to cut the material from the work piece through milling machine. First one is named as conventional milling or Up milling and the other one known as climb milling or down milling. The main and basic difference between up milling and down milling is the direction of rotation of cutter to the feed. In up milling the cutter is rotate clockwise when cutting the work piece from right to left. In this type of milling the tool spins against the direction of feed. In this milling process, the cutting chips are carried upward by the tool.

In down milling, the cutter rotates clockwise while cutting the work piece from left to right. In this milling operation, the tool spins with the direction of feed. The cutting chips are carried downward by the tool.

Difference Between Up Milling and Down Milling

 

Difference between Up milling and Down milling:

Up Milling and Down Milling


Up Milling



Down Milling

1.
In up milling the cutter rotates against direction of feed.
In Down milling, the cutter rotates with direction of feed.
2.
It is also known as conventional milling.
It is also known as climb milling.
3.
In this, chip width size is zero at initial cut and increase
with feed. It is maximum at the end of feed.
In this cutting process, chip size is maximum at start of cut
and decrease with the feed. It is zero at the end of feed.
4.
In this process, heat is diffuse to the work piece which
causes the change in metal properties.
In down milling most of heat diffuse to the chip does not
change the work piece properties.
5.
In up milling, tool wear is more because the tool runs
against the feed.
In this, tool wear is less compare to the up milling, due
to the cutter rotate with the feed.
6.
Tool life is low.
Tool life is high.
7.
The cutting chips are carried upward by the tool so known
as up milling.
The chips are carried downward by the tool so known as
down milling.
8.
The cutting chips fall down in front of the cutting tool
which again cut the chips cause less surface finish.
The cutting chips fall down behind the tool. This gives
better surface finish.
9.
Due to upward force by tool, high strength zig and fixture
required to hold the work piece.
In down milling, downward force act on work piece normal
zig and fixture required.
10.
It is the traditional way of cutting the work piece.
It is non-traditional way, but now days, down milling used
more than up milling.
11.
High quality cutting fluid is required because heat
diffuse in the work piece.
In this process heat does not diffuse in the work piece,
so simple cutting fluid is required.
12.
It required high cutting force compare to down milling.
It required low cutting force.

 

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