Ball Screw
Rack & Pinion
External force
F
N
Workpiece mass + table mass
W
kg
Ball screw diameter
D
m
Ball screw length
L
m
Ball screw pitch
P
m
Ball screw material density
ρ
kg/m
3
Friction coefficient
μ
Gear ratio*
G
Mechanical efficiency
η
External force
F
N
Workpiece mass + rack mass W
kg
Pinion diameter
D
m
Pinion thickness
L
m
Pinion material density
ρ
kg/m
3
Friction coefficient
μ
Gear ratio*
G
Mechanical efficiency
η
Belt drive
Roll feed
External force
F
N
Workpiece mass + belt mass W
kg
Pulley diameter
D
m
Pulley width
L
m
Pulley material density
ρ
kg/m
3
Pulley moment of inertia J
kg·m
2
Gear ratio*
G
Mechanical efficiency
η
Sheet tension
F
N
Roll diameter
D
m
Roll width
L
m
Roll material density
ρ
kg/m
3
Roll moment of inertia J
kg·m
2
Gear ratio*
G
Mechanical efficiency
η
Rotary indexing table
Table mass
W
kg
Table diameter
Dt
m
Table support diameter Dh
m
Table moment of inertia J
kg·m
2
Friction coefficient of table support
μ
Gear ratio*
G
Mechanical efficiency
η
Selection materials by mechanism
D
Work
Work
Timing belt
L
Work
Rack
Pinion
Table
L
External force
External force
F
D
P
M
M
M
D
D
M
L
External
force
M
Dt
Dh
D
Work
Work
Timing belt
L
Work
Rack
Pinion
Table
L
External force
External force
F
D
P
M
M
M
D
D
M
L
External
force
M
Dt
Dh
D
Work
Work
Timing belt
L
Work
Rack
Pinion
Table
L
External force
External force
F
D
P
M
M
M
D
D
M
L
External
force
M
Dt
Dh
* Calculation of gear ratio (G)
M
G1
G=
Ball screw gear teeth (G2)
Motor gear teeth (G1)
G2 Ball screw
Typical mechanism examples and required selection criteria are shown below. Provide us with these informa-
tion when consulting us for selection.
123
Features
S
erv
o Amplifier
and S
erv
o Motor
Combination T
able
Standard Model
Number List
S
erv
o Amplifier
s
R 3E Model
S
erv
o Motor
s
Options
S
election Guide
Analog/P
ulse
EtherCA
T
Built-in P
ositioning F
unction
S
afety