Tolomatic User Guide:
IMA-S Integrated Motor Rod-Style Actuator - Stainless Steel
• 35 •
7:
R E P A I R A N D M A I N T E N A N C E
Actuator Peak Thrust Rating (T
PEAK
) to the Cycle Equivalent Load (P
e
).
K
T
=
K
Co
( )
- 0.15
T
PEAK
P
e
ST33RN04 ST33RN05 ST33RN10 SA33RN04 SA33RN05 SA33RN10
K
Co
0.200
0.180
0.454
0.434
0.367
0.711
IMPORTANT NOTE:
If calculated K
T
is greater than 1, a K
T
value of 1 should be used for the
Lubrication Interval (t
L
) calculation
Step 3:
The Lubrication Interval (t
L
) for a given cycle is then calculated as:
t
L
=
t
BL
x
K
T
(hours)
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)
• Re-lubricate with Tolomatic Grease #2733-1345
into the grease zerk located in the rod end.
ROLLER SCREW LUBRICATION (Example Calculation)
Cycle Details:
Product: IMA-ST 33 RN05
V
RMS
: 1.66 in/sec
T
PEAK
: 2500 lbf
P
e
:
500 lbf
Step 1:
Select the Basic Lubrication Interval (
t
BL
) based on the cycles RMS Velocity (
V
RMS
).
