Rated life span

Average axial load
3 Fa
m = (Fa R
13 S 1095+Fa
23 52.5+Fa
63 52.5) =25.5 N12 ? Rated life spanf
L=

( )

Ca 3 f w ? Fa m 10 6 =1.53 10 13 rev. W : load factor(1.2)* The above rated life span is converted to the traveling life span of the ball screw.LS=L? R 10
-6 =3.06 10
8 Km

Result

The following table summarizes the evaluation results.
KR5520AStatic safety factorBuckling load (N) LM guide section33.9–– – –3.25 × 10 Permissible tensile compressive load (N) Critical speed (min –1 )DN valueRated life span (km)Max. axial load (N) × 10 6 × 10 7 8 –– Ball screw section122.211000353001560311253.32 761500 Supporting bearing52.5––– –3.06 –– Max. operating rotational speed (min –1 ) Whether the evaluated model can be used can be judged from numerical values such as static safety factor.Also, the rated life span of the shortest LM guide section is taken as the rated life span of the evaluated model KR5520A.

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