
199Cutting Flat Surfaces
The width of the undeformed chip, b: This is measured along the cutting edge.
For parallel broaching,
b is the width of a keyway
b is the circumference of a round broach
b is the total length of all the splines
The undeformed chip area, A
z
, for a single cutting edge is given for a single
spline as
ASb
zz
=
for n
sp
splines,
AnSb
zspz
mm=
and for circular broach,
ASd
zz
=π
where
S
z
is the chip thickness to be removed by each tooth in mm
d is the diameter of broach in mm
b is the spline width in mm
The total chip cross-sectional area, A
c
, is
AAZ
cze
=
where Z
e
is the number of teeth simultaneously cutting, given by
Z
e
=
wher ...