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Permissible tensile compressive loadP 2 = ? ? d Ï€ 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 speed60 ? 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 valueDN=31125 ( 50000)D: ball center diameter(20.75 mm)N: max. operating rotational speed(150 min-1 ) Rated life spanAverage 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 factorfs = = =52.5P aFa P aFa max 2 13 |