2700-4001_22 IMA Manual
48
Last Revision: 12/14/2021
•
Re-lubricate with Mobilith SHC220 #2744-1016
(QUANTITY: IMA33: 3.0 g; IMA44: 5.0 g; IMA55: 7.0 g) into the grease zerk located on the rod end.
•
IMA22 ball-screw does not require relubrication.
BALL SCREW LUBRICATION (Example Calculation)
Cycle Details:
Product: IMA33 BN
V
RMS
: 1.66 in/sec
T
RMS
: 400 lbf
T
MAX
: 400 lbf
Step 1:
Calculate your actuator's power output.
P
IMA
=
1.66 in/sec • 400 lbf • 0.113 = 75
(watts)
Step 2:
Select the appropriate actuator power level.
P
C
P
C
= 105 = IMA33BN
Step 3
: Calculate the Power Factor.
Step 4:
The lubrication interval (
t
l
) for a given cycle is then calculated as:
t
l
= 9000
(hours)
=
K
P
> 1
ROLLER SCREW
For optimal performance and rated life, periodic re-lubrication is required.
Figure 7.1: Roller Screw Lubrication Interval Graph
Where:
t
BL
= Basic Lubrication Interval
(hours)
V
RMS
= RMS Velocity
(in/sec)
K
T
= Thrust Correction Factor
K
Co
= Screw Static Load Factor
T
PEAK
= Actuator Peak Thrust Rating
P
e
= Cycle Equivalent Load
t
L
= Lubrication Interval
(hours)
