Rockwell Automation Publication MPAI-IN001F-EN-P - January 2016
47
MP-Series Heavy-duty Electric Cylinders
Lubrication Calculation Example
The following is an example of lubrication interval calculation for MPAI-
x
3
xxx
RM
xx
electric
cylinder.
Operators
Variable
Description
F
xpeak
Actuator peak force
F
xn
Application maximum command force
K
Load correction factor
S
co
Screw static load factor
t
bl
Basic lubrication interval
V
rms
RMS velocity
Screw Static Load Factors
Cat. No.
S
co
MPAI-x3xxxRM3xx
0.24
MPAI-x3xxxSM3xx
0.44
MPAI-x4xxxRM3xx
0.26
MPAI-x4xxxSM3xx
0.40
EXAMPLE
Product
MPAI-x3xxxRM3xx
V
rms
1.66 in/s
F
xpeak
1700 lbf
F
xn
400 lbf
t
bl
= 4500 x (1.66 in/s)-1.57
= 2030 hr
K
MPAI-
x
3
xxx
RM3
xx
= 0.24 (1700 lbf/400 lbf)
-0.15
= 0.87
t
l
= 2030 x (0.87)
= 1766 hr