306 TECHNICAL INFORMATION Buckling load n·π2·E·I P1= ×0.5=5562.02(N) ℓa2 P1 : Buckling load ℓa : Distance between support and nut 250(mm) E : Young's modules 2.06×105(N/mm2) n : Coefficient according to mounting method 0.5: Safety factor I : Minimum geometrical moment of inertia of screw shaft π· 14 I= =85.49(mm4) 64 1 : Root diameter of screw shaft 6.46(mm) Allowable tension/compression load ·π·d12 P2= =4818.06 4 P2 : Allowable tension/compression load (N) : Allowable tension/compression stress 147(N/mm2) d1 : Root diameter of screw shaft 6.46(mm) Critical speed 60· 2 E×103·I N1= · ×0.8=12485(min−1) 2π·ℓ 2 ·A N1 : Critical speed ℓ : Distance between mounting points E : Young's modules 2.06×105(N/mm2) : Coefficient according to mounting method (Fixed-Support 3.927) : Density (7.85×10−6kg/mm3) 0.8: Safety factor DN value DN=62250(≤70000) D : Ball center to center diameter (8.3mm) N : Maximum number of operating revolutions (min−1) Rated life span Axial average load 3 1 Fm= (Fe13·L1+Fe23·L2+Fe33·L3··Fen3·Ln)=6.096(N) Ls Rated life span Ca 3 L= ·ℓ×106=25.64×106(km) fw·Fm fw : Load coefficient 1.2 ℓ : Ball screw lead 2 (mm) 3−3 Examination of support bearing Axial load Fe1=0.981(N) Fe2=9.311(N) Fe3=7.352(N) Static safety coefficient Poa Poa fs= = =129.42 Femax Fe2 Equivalent load Axial average load 3 1 Fm= (Fe13·L1+Fe23·L2+Fe33·L3··Fen3·Ln)=6.096(N) LS Rated lifetime Ca 3 L= ·ℓ×106=22.41×106(km) fw·Fm fw : Load coefficient 1.2 ℓ : Ball screw lead 2 (mm) ( ) ( ) LX2602 Rail Ball screw Support bearing Static safety factor 114.09 241.76 129.42 Buckling load (N) − 5562.02 − Allowable tension/compression load (N) − 4818.06 − Critical speed (min-1) − 12485 − DN value − 62250 − Rated lifetime (km) 1.6×106 25.64×106 22.41×106 Maximum axial load (N) − 9.311 − Maximum number of operating revolutions − 7500 −
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