Sandvik Coromant Silent tools - application guide - Manual (Page 93)

91
F
t
= k
c 0,4
x
0,4
f
n
(
(
0,29
x f
n
x AP
0,4
f
n
x sin KAPR
(
(
m
c
x f
n
x AP
F
t
= k
c 0,4
x
6. Formulas and Definitions
Turning – METRIC
Tangential force, F
t
k
c 0,4
: Specific cutting force at feed 0,4 mm/r
m
c
Constant, depending on the material. Use 0,29 as general
value.
When the entering angle. KAPR, is 75 degrees or longer, sin KAPR ~1.
Use the simplified formula:
Tangential force, F
t
Rule of thumb: F
t
should not exceed 90% of maximum load stated
for the bar used.