IAI America RCS2W - Manual (Page 136)

6. Life
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6. Life
6.1 Rod Type

The product life is assumed to be 5,000km (reference) under the condition that it runs with maximum
transportable weight and maximum acceleration/deceleration.

6.2 Flat Type
The mechanical life of the actuator is represented by the greatest moment load on the guide.
One of the elements determining the operation life is “rated load”.
There are two types of “rated load”, one is the “static rated load” and the other is the “dynamic rated load”.
• “Static rated load” : it is load that makes a small dent mark on the interface when a load is applied in a
stopped condition
• “Dynamic rated load” : it is a load that the remaining rate of the guide not being broken and is assumed
constant after an operation for a certain distance is carried out with a load being
applied.

The guide supplier shows the dynamic rated load assuming the remaining rate of the guide not being broken after
50km of operation is 90% for the life of the guide.
However, it is important to know the specific product life for the general-purposed industrial machines also from
the view of maintenance.
The life of the guide is sufficient for the radial load, and is mostly influenced by the moment load caused by the
offset from the center of the guide.
The operation life is set to 5000km assuming 1.2 times of the load coefficient (safety margin) under the allowable
load moment. [For the dynamic allowable load moment, refer to 1.2 Specifications.]
The formula of the dynamic allowable load moment when the operation life is 5,000km is as shown below:





The life with the applied moment can be calculated with the following formula.



C
IA
= M 50
fw
×
5000 km
50km
3
1
C
IA
: Dynamic allowable load moment
fw : Load coefficient (=1.2)
M50 : Dynamic rated moment when run for
50km and remaining rate is 50%.
L : Operating life (Remaining Probability 90%)
C
IA
: Dynamic allowable moment
P : Applied moment
L =
C
IA
P
× 5000 km
3