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Engineering · Mechanical Engineering
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shown A vertical shaft, made from AISI 1040 cold drawn steel, carries pulleys. A schematic of the shaft is in a horizontal position for convenience of plotting axial diagrams. The tensile forces in the belts under operating conditions are shown. Also, the shaft carries an axial compressive load of 6.2 kN The torque/power is transmitted between each pulley and the shaft by a key fitted in a sled-runner keyseat type The steps listed below will ultimately lead you to the computation of the maximum shear stress using the 2 equation maximum shear stress at the same point where σ and τ occur ơ: tensile or compressive stress creates by vanous loads t-shear stress creates by vanous loads Part 1 Direct Com 1. Using reasonable design assumptions, propose a diameter for the shaft based on direct normal stress. Be sure to state your safety factor and reasons for picking that factor 2. Determine the stress concentration factor &for a sled-runner keyseat (same as in bending) 3. Using the stress concentration factor K just determined, adjust your recommendation for shat diameter 4. Based on your recommended diameter, compute the deformation&due to force P Torsional shear stress and deformation 5. Compute the torque Te and Te due to tensile forces in the belts at point B and C, respectively 6. Draw the torque diagram to show the level of torque in all segments of the shaft 7. Based on your recommended diameter found in step 4 above, compute the nominal torsional stress and on the outer surface of the shaft for cross sections passing through points B and C due to the torque Te and T Compute the angle of twist through point C 8 of the cross section passing through B with respect to that passing 9. Determine the stress concentration factor K in torsion, for a sled-runner keyseat 10. Using the stress concentration factor Ki just determined, calculate the shear stresses a and to on the outer surface of the shaft for cross sections passing through points B and C, respectively 11. If necessary, adjust your recommended diameter to allow for the direct shear stress. Reiterate the calculations for ơ, and tx Key Design 12. Determine the force F that the shaft exerts on the key 13. Suggest the dimensions (length, width, and height) of the key if it was made of steel. (there are many possible solutions)
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