Introduction to Machine Design Machine Design
3 August 15, 2007 P N Rao 13 Design process elements Decide on a number alternatives Evaluate each alternative and discard the unsatisfactory ones Choose the optimum one from the alternatives Implement the design August 15, 2007 P N Rao 14 Stages in the design process
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MD-12 Spur Gear Design - University of Northern …
uni.edu1 P N RAO 1 12. Spur Gear Design and selection Objectives • Apply principles learned in Chapter 11 to actual design and selection of spur gear systems.
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uni.eduIntroduction Gears are the most ... Manufacturing Engineering and Technology, Prentice Hall Spur gear nomenclature August 15, 2007 12 Gear Types ... Db =Dp cos ϕ August 15, 2007 53 ...
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uni.edu3 August 15, 2007 13 Fig. 8.6 Helical Compression Spring Design Free length, Lf Solid length, LS Deflection, δ August 15, 2007 14 Spring Rate Spring rate (k) is ratio of change in force to the change in length Force (F) exerted by the spring is F = k (Lf – Lo) Appendix 12 Standard spring selection L F k ∆ ∆ = Eq 8.1 Eq 8.2 August 15, 2007 15
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uni.eduLoads from Worm gears August 15, 2007 16 Loads from Worm gears Axial force on the worm gear where λ= lead angle ϕ= normal pressure angle f = coefficient of friction ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ + = cosφcosλ- f sinλ cosφsinλ f cosλ Fa(gear) Ft(gear) August 15, 2007 17 Loads from Belts and Chains For a belt, Total load, Ft = Ff + Fb Net ...
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uni.edustresses should be compared to the stress allowables for the materials being used in the design. 4 Grouping Types of Stresses • Axial and Bending • Torsion and Shear Appendix 1 p 466 5 Combined Axial and Bending stresses • Summation of stresses taking the directions into account – Column with an eccentric load •S = ±S axial ±S ...
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