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2.4 Shaft Assume forces acting on drum shaft is shown in the free body diagram Fig 2B. Given that the torque transmitted by the gear shaft is 581 Nm and the load is applied gradually, determine the shaft diameter (1st choice) assume commercial steel shaft and all components are keyed to the shaft.
2.4 d = 50 mm;
Engineering System Design - Design Tables 5. SHAFT Table 5-1 Allowable Shear Stress and Bending Stress values for commercial steel shafts With Keyway T₁ = 40 MN/m² 0 = 80 MN/m² Allowable shear stress Allowable bending stress For other shafts, Tall= 1st 10 12 16 20 25 30 40 50 60 80 Preference 2nd 15 Stationary Shafts Gradually applied loads 35 45 55 70 Imax N 90 omax N Table 5-2 Shock and fatigue factors Suddenly applied loads Rotating shafts Gradually applied or steady loads 1.5 1.0 Suddenly applied loads with minor shock 1.5-2.0 1.0-1.5 Suddenly applied loads with heavy shock 1.5-3.0 1.5-3.0 Table 5-3 Preferred shaft diameters ZSEGSD Designtable1.Doc and all = 3rd (14) (17) (18) (22) (28) (32) Without Keyway Tal=55 MN/m² dal = 100 MN/m² (42) (48) (65) (75) (85) K₂ 1.0 1.5-2.0 1st 180 200 220 250 280 320 360 400 450 500 560 K₂ 630 1.0 1.5-2.0 Preference 2nd 240 260 300 340 380 420 480 530 600 5-Shaft 3rd (170) (190) (210) (230) (440) (460) 24
Engineering System Design - Design Tables 100 120 140 d 10 12 14 16 18 20 22 25 28 30 (32) 35 38 40 (42) 45 (48) D 50 55 60 (65) 70 (75) 110 12 0.5 130 160 1000 Note: a) Most bearing bore diameter comes in step of 5 mm; b) Shaft diameter smaller than 10 mm is also possible if suitable bearing is available. Table 5-4 Fillet radii for stepped shafts in Torsion Radii 150 (125) 16 1.0 1.0 0.5 20 1.5 1.0 1.0 25 1.5 1.5 1.5 1.0 D 30 710 2.0 1.5 1.5 1.0 800 900 40 2.0 2.0 2.0 1.5 1.5 1.0 50 670 2.0 1.5 1.0 750 850 950 2.5 2.5 2.5 2.5 60 5-Shaft 3.0 3.0 3.0 2.5 2.5 1.5 80 4.0 4.0 3.5 2.5 1.5
1.1.4 Shaft gall = Fall > 0 M₂ d = omax N d = and Mx + My 3 16k T Itall 3 16 and IT all Or Tall Tall > T d= Tmax N 3 32k+M no all (k₂M)² + (k₂T)2²
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