Permissible tensile compressive load

P 2 = ? ? d π 4 12 =35300 N P
2 : 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 load
3 Fa
m = (Fa R
13 S 1095+Fa
23 52.5+Fa
63 52.5) =25.5 N12 ? Rated life spanf
3 L= ?

( )

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)

Fa
1 =4 NFa
2 =76 NFa
3 =0 NFa
4 =0 NFa
5 =0 NFa
6 =68 N

Static safety factor

f


s = = =52.5P aFa P aFa
max 2

13