
179Cutting Flat Surfaces
l is the length of the surface being milled in mm
l
o
is the length of cutter overrun in mm
The approach length, l
a
, and the length of cutter overrun, l
o
, depend on the
depth of cut, t, and the cutter diameter, d (both in mm). Then
ll td t
ao
mm==+−∆ ()
where ∆ ranges between 2 and 5 mm. Because
t
ltdt
m
=
++ −2( ()
(min)
∆
6.3.1.7 Factors Affecting the Cutting Forces
These factors are classied according to workpiece material, tool material,
tool shape, and machining conditions (see Figure 6.17).
Rake angle: As shown in Figure 6.18, the decrease of the cutting forces and
power was explained by the degree of ...