Which of the following statements are correct in respect of up – milling and down milling?
1. In up – milling the cutter rotates in a direction opposite to that of work piece travel where as in
down - milling the cutter rotates in a direction similar to that of work piece travel
2. In down - milling chip will be thin at the beginning and increase to a maximum at the end
of the cut and reverse will be the case for achip formed by up – milling
3. Down - milling is desirable with milling cutters having a high radial rake angle when compared
to up – milling
4.Down - milling forces the work piece against the milling table to exert more pressure while
up – milling tends to lift the work piece from the table
Select the correct using the codes given below
(a) 1, 2 and 3 (b) 1, 2 and 4 (c) 3 and 4 (d) 1, 3 and 4