Rockwell Automation MPAI Heavy Duty Electric Cylinders - Manual (Page 49)

MP-Series Heavy Duty Electric Cylinders 49
Rockwell Automation Publication MPAI-IN001E-EN-P - March 2012
Lubrication Calculation Example
The following is and example of lubrication interval calculation for MPAI- x3xxxRMxx 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-x3xxxRM3xx
= 0.24 (1700 lbf/400 lbf) -0.15 = 0.87
t
l
= 2030 x (0.87) = 1766 hr