Miller SRL2-M Series
Rodless Cylinders
18
To check the energy absorption capacity of the cylinder’s shock
absorber in the middle of the stroke, use the following formulae.
Horizontal Mounting
E =
WV
2
+ FS
772
E =
WV
2
+ (F+W) · S
772
We = W +
772 FS
V
2
We = W +
772 (F+W)S
V
2
E =
WV
2
+ (F-W)S
772
We = W +
772 (F-W)S
V
2
Vertical Mounting -
Shock absorber at bottom
Vertical Mounting -
Shock absorber at top
E
= Energy to absorb (in. lbs.)
W
= Weight attached to piston table (lbf)
F
= Actual cylinder propelling force (lbf)
S
= Stroke of shock absorber (in.)
V
= Impact velocity (in./sec.)
We = Effective weight (lb.)
Cylinder
SRL2-M 16
SRL2-M 20
SRL2-M 25
SRL2-M 32
SRL2-M 40
SRL2-M 50, 63
Shock Absorber No.
NCK-00-0.3-C
NCK-00-0.7-C
NCK-00-1.2
NCK-00-2.6
NCK-00-7
NCK-00-12
Max. Energy Absorption - in.-lbs.
26.0
60.8
104.2
226
608
1042
(kgf · m)
(0.3)
(0.7)
(1.2)
(2.6)
(7.0)
(12)
Stroke - inches
.236
.315
.394
.590
.787
.984
Energy Absorption/hour - in.-lbs/hour
54,700
109,380
187,510
338,560
729,200
750,000
Max. Impact Velocity - in./sec.
59
59
78.7
78.7
98.4
118.1
Max. Frequency Stroke per Minute
35
30
30
25
20
12
Ambient Temperature - F°, (C°)
41-140 (5-60)
Spring Return Force - lb. Extended
.65
.45
.65
1.33
2.20
3.60
Compressed
1.01
.97
1.33
2.65
4.86
7.49
Return Time - Sec.
0.3
0.3
0.3
0.3
0.4
0.4
Figure 4. Specifications
Figure 3. Effective Weight Versus Impact Velocity
for Various Size Shock Absorbers.
Note: The following applies to the shock absorber
being used with whole stroke adjustment.
The allowable absorption energy varies depending
on impact velocity. When impact velocity is 78
in./sec., the maximum calculated absorption
energy should not exceed 1/3 of the value shown
in Figure 4. At an impact velocity of 39 in./sec., it
should not exceed 1/2 the value shown in Figure 4.
Impact Velocity V in./sec.
W
W
V
V
W
V
22050
2205
220
22
2.2
20 4.0
39.4
113
Effective Weight We Lbs.
(6) Allowable collision energy of shock absorber.
By using the following formula, calculate collision equivalent
effective weight (We) and collision energy (E), and ensure that both
are below the allowable values shown in Figure 3. Also ensure that
repeat frequency and collision speed are within specified allowable
values in Figure 4.
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