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Text version of the page
Permissible tensile compressive load
P 2 = ? ? d π 4 12 =35300 N P2 : permissible tensile compressive load(N) δ : permissible tensile compressive stress(147 N/mm
2 )d
1 : screw shaft thread minor diameter(17.5 mm)
Critical speed
60 ? λ 2 3 N E 10 ? I -1 1 = ? 2 p ? R b2 γ ? A 0.8 =1560 min N-1 1 : critical speed(min ) R
b : distance between two mounting surfaces(1300 mm) γ : density(7.85 10
-6 kg/mm
3 ) λ : installation procedure coefficient(fixed - supported 3.927)0.8: safety factor
DN value
DN=31125 ( 50000)D: ball center diameter(20.75 mm)N: max. operating rotational speed(150 min-1 )
Rated life span
Average axial load3 Fa
m = (Fa R
13 S 1095+Fa
23 52.5+Fa
63 52.5) =25.5 N12 ? Rated life spanf
3 L= ?
LM Guide Actuator KR - 328 ( )
Ca f w ?Fa m R =3.32 10 7 km W : load factor(1.2) R : ball screw’s lead(20 mm)Evaluation of Rated Life Span of Supporting Bearing Axial load (same as ball screw)
Fa1 =4 NFa
2 =76 NFa
3 =0 NFa
4 =0 NFa
5 =0 NFa
6 =68 N
Static safety factor
fs = = =52.5P aFa P aFa
max 2