
184 Fundamentals of Machining Processes
For a tool setting angle χ = 90°, the area of the hatched element, A
sz
, becomes
AS
d
d
sz z
=
sin
where
S
z
is the feed per tooth in mm
d is the cutter diameter in mm
The area swept by a single tooth, A
sz
, is
AS
d
d
sz z
=
∫
2
2
sin
φ
AS
sz z
(cos co
The mean chip thickness h
m(90)
becomes
h
m(90)
sz
=
φ
h
m(90)
z
=
φ
For the setting angle, χ, the mean chip thickness h
m(χ)
is
h
m( )
z
χ
=
φ
The mean cutting force on a single tooth, F
m
, is
msm( )
χ
F
m
sz
=
φ
Because t = b sin χ,
F
m
sz
=
ϕ
If the number of teeth cutting at the same time