Up milling and down milling

 Comparison of up milling and down milling

Sr.
No.
Up milling or
conventional milling
Down milling or climb
milling
1.
The
cutter is rotate against direction of travel of the work piece.
The
cutter rotates in the same direction of travel of the work piece.
2.
The  chip  thickness is   minimum at
the beginning
of the cut and or reaches to maximum when the cut terminates.
The  chip  thickness is   maximum at
the beginning
of the cut and or reduces to minimum when the cut terminates.
3.
The cutting force is
zero at the beginning of the cut and maximum at the end of the cut.
The cutting force is
maximum when the cut begins and it reduces to minimum when the tooth leaves the
work.
4.
The
cutting force is directed upward and this tend to lift the work piece from
the fixture
The   cutting   force   is downwards
which tends
to seat the work piece firmly in the fixture.
5.
Difficulty
in pouring the coolant just on the cutting edge, due to typical nature of 
the
cut
The
coolant can be poured directly at the cutting    zone     where cutting   force is maximum.
6.
The
chip accumulate ate the cutting zone and may be carried over with the cutter spoiling
the work surface
Chips
are disposed off easily and do not interfere with the cutting.
7.
The actual cutting
does not start at zero chip thickness as teeth slide through a minute
distance which gives a slightly
wavy surface
Chips
are disposed off easily and do not interfere with the cutting.

Up milling or conventional milling
Up milling or conventional milling

               
                                                                                               


Down milling or climb milling
Down milling or climb milling

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