Page 204 - Mechanical Engineer's Data Handbook

192 MECHANICAL ENGINEER'S DATA HANDBOOK

5.7 General information on metal cutting

5.7. I Cutting speeds and feed rates

Cutting speed (m s- ')

High-speed steel
Feed rate (mmrev.-')
Material of
workpiece Rough Fine

Mild steel 75 0.625-2.0 0.1254.75
Cast steel 33 0.5-1.25 0.1254.50
Stainless steel 3 .O 25 0.5-1.00 0.075-0.175
Grey cast iron 27 3.5 45 0.4-2.5 0.20-1 .00
Aluminium 90 50 15 72 180 0.1-0.5 0.0754.25
Brass 75 100 18 60 180 270 150 0.375-2.0 0.20-1.25
50 0.3754.75
Phosphor bronze 18 36 4.5 13 120 180 - 0.125-0.50
R, rough; F, fine; R & T, reaming and threading; D, drilling.

2.7.2 Power used and volume removed
in metal cutting

Symbols used:
P=power (kW)
d = depth of cut (mm)
f= feed (mm rev.- I)
o=cutting speed (mmin-')
T= torque (N-m)
D = drill diameter (mm)
N = rotational speed (rev. min- ')
w = width of cut (mm)
f, = milling machine table feed (mm min- l)
V= volume of metal removed (cm3 min- ')

Material k, kD kM Material k, kD kM

Aluminium 700 0.1 1 0.9 Mild steel 1200 0.36 2.7
Brass 1250 0.084 1.6 Tool steel 3000 0.40 7.0
Cast iron 900 0.07 1.9