Page 186 - Mechanical Engineer's Data Handbook

174 MECHANICAL ENGINEER’S DATA HANDBOOK

Typkd values of P.

Specific power
Material consumption, P.

Plain carbon steel 34
Alloy steel 71
Cast iron 24
Aluminium alloy 12
Brass 25

5.2.4 Tool life, T

Wear
T= - (min) lend

Values of C and n

Wear land width (mm)

Tool material C n Roughing Finishing
~~
High-speed steel &IO0 0.08-0.15 1.5 0.25-0.38
Cemented carbide 200-330 0.16-0.5 0.75 0.25-0.38
Ceramic 330-600 0.404.6 0.25-0.38 0.25-0.38

5.2.5 Tool ch8racteristics Force versus depth of cut

Force versus cutting speed F, increases with depth of cut.
F, increases at decreasing rate with depth of cut.
F, is constant over normal range of cutting speed.
F, increases slowly with cutting speed. 1200
lo00

i- 400

200

0 0.5 1.0 1.5 2.0 2.5
Wdcut. d(mm)
Force versus rake angle

F, and F, fall slowly with rake angle.