19
Series
LEJ
m
Me
L
7
m
Me
L
8
0
200
400
600
800
1,000
0
2
4
6
10
8
Work load [kg]
L7
[mm]
0
200
400
600
800
1,000
0
5
10
15
20
Work load [kg]
L7
[mm]
0
2
4
6
10
8
0
200
400
600
800
1,000
Work load [kg]
L8
[mm]
0
200
400
600
800
1,000
0
5
10
15
20
Work load [kg]
L8
[mm]
x
y
z
x
y
z
x
z
y
x
z
y
0
200
400
Lx
600
800
1,000
0 10 20 30 40 50
L1
[mm]
Work load [kg]
0
200
400
600
800
1,000
0 10 20 30 40 50
L2
[mm]
Work load [kg]
Ly
0
200
400
600
800
1,000
0 10 20 30 40 50
L3
[mm]
Work load [kg]
Lz
Dynamic Allowable Moment
Calculation of Guide Load Factor
1. Operating conditions
Model: LEJS
Size: 40
Mounting orientation: Horizontal
Acceleration [mm/s
2
]: 5000
Work load [kg]: 20
Work load center position [mm]:
Xc = 0
,
Yc = 50
,
Zc = 200
2. Select the graph on page 18, top and left side first row.
Example
Acceleration [mm/s
2
]:
a
Work load [kg]:
m
Work load center position [mm]:
Xc/Yc/Zc
Mounting orientation
1. Horizontal
3. Wall
2. Bottom
4. Vertical
*
This graph shows the amount of allowable overhang when the center of gravity of the workpiece overhangs in one direction. When the center of
gravity of the workpiece overhangs in two directions, refer to the Electric Actuator Selection Software for confirmation. http://www.smcworld.com
Acceleration/Deceleration
5,000 mm/s
2
15,000 mm/s
2
10,000 mm/s
2
20,000 mm/s
2
1. Decide operating conditions.
Model: LEJS/LEJB
Size: 40/63
Mounting orientation: Horizontal/Bottom/Wall/Vertical
2. Select the target graph with reference to the model, size and mounting orientation.
3. Based on the acceleration and work load, obtain the overhang [mm]:
Lx/Ly/Lz
from the graph.
4. Calculate the load factor for each direction.
α
x = Xc/Lx
,
α
y = Yc/Ly
,
α
z = Zc/Lz
5. Confirm the total of
α
x
,
α
y
and
α
z
is 1 or less.
α
x +
α
y +
α
z
≤
1
When 1 is exceeded, please consider a reduction of acceleration and work load, or a
change of the work load center position and series.
3.
Lx = 180 mm
,
Ly = 170 mm
,
Lz = 360 mm
4. The load factor for each direction can be obtained as follows.
α
x = 0/180 = 0
α
y = 50/170 = 0.29
α
z = 200/360 = 0.56
5.
α
x +
α
y +
α
z = 0.85
≤
1
Orientation
Load overhanging direction
m
: Work load [kg]
Me
: Dynamic allowable moment [N
⋅
m]
L
: Overhang to the work load center of gravity [mm]
Model
LEJS40
LEJS63
Vertical
Y
Z
