Up milling and down milling ~ MECHTECH GURU

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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