-10-
No. TQ1230001-OM104-A
3.3. How to calculate theoretical lifting force
This manual shows how to calculate theoretical lifting force only. Refer to the catalog of suction cups for further
detail of suction cup selection method.
■
How to calculate theoretical lifting force
The theoretical lifting force of a cup can be found by calculation or from the theoretical lifting force table.
Calculation
Theoretical lifting force table
The theoretical lifting force (not including the safety factor) can be determined by the cup diameter and vacuum
pressure.
The required lifting force can then be determined by dividing the theoretical lifting force by the safety factor
t
.
Lifting force = Theoretical lifting force / t
Theoretical lifting force
(Theoretical lifting force = P x S x 0.1)
Cup diameter (
Φ8 to Φ32)
[N]
Cup
diameter
[mm]
Φ8
Φ10
Φ13
Φ16
Φ20
Φ25
Φ32
S: Cup area [cm
2
]
0.50
0.79
1.33
2.01
3.14
4.91
8.04
Vacuum
pressure
[kPa]
-85
4.2
6.6
11
17
26
41
68
-80
4.0
6.2
10
16
25
39
64
-75
3.7
5.8
10
15
23
36
60
-70
3.5
5.5
9.3
14
22
34
56
-65
3.2
5.1
8.6
13
20
31
52
-60
3.0
4.7
8.0
12
18
29
48
-55
2.7
4.3
7.3
11
17
27
44
-50
2.5
3.9
6.7
10
15
24
40
-45
2.2
3.5
6.0
9.0
14
22
36
-40
2.0
3.1
5.3
8.0
12
19
32
W: Lifting force [N]
P: Vacuum pressure [kPa]
S: Cup area [cm
2
]
t: Safety factor Horizontal lifting: 4 or more
Vertical lifting: 8 or more
Cup
