11.1 Reference Information for Servomotor Capacity Selection
11.1.2 Conversions between Traditional Units and SI Units
11-3
11
Appendix
11.1.2
Conversions between Traditional Units and SI Units
Quantity
Traditional Unit
SI Unit
Conversion Factor
Force or load
kgf
N
1 kgf = 9.80665 N
Weight
kgf
–
The numerical values are the same for mass in
the traditional unit and the SI unit.
(The mass SI unit Wkg is used for objects in
the Wkgf traditional unit.)
Mass
kgf
s
2
/m
kg
Torque
kgf
m
N
m
1 kgf
m = 9.80665 N
m
Inertia (moment of
inertia)
gf
cm
s
2
kg
m
2
1 gf
cm
s
2
= 0.980665
×
10
-4
kg
m
2
GD
2
kgf
m
2
kg
m
2
Relationship between GD
2
(kgf·m
2
) and
moment of inertia (kg·m
2
)
=
J
GD
4
J
4
J
