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Estimation of Time on Different Operations

Material Operations (cutting speeds are in m/min.)
Turning
and
Boring 		Drilling Reaming Threading Tapping Milling Shaping,
Slotting and
Planing		 Grinding
Aluminium 300 120 120 30 45 200 25 20
Brass 50 50 25 30 20 40 12 22
Mild Steel 30 25 12 25 5 20 20 15
Cast Iron 20 15 10 20 7 500 10 12
Copper 30 50 15 30 20 40 10 22