DME-II Online Assignment-1


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Student Details

Problem-1


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Pb-1
A pair of Helical gears consists of a 30 teeth pinion meshing with a 77 teeth gear. The pinion rotates at 930rpm. The normal pressure angle is 20. while the helix angle is 25. The face width is 60mm and the normal module is 6mm. The pinion as well as gear are made of steel 40C8(Sut=614N/mm2) and heat treated to a surface hardness of 458BHN. Find the Beam Strength and Wear Strength


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Problem-2


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Pb-2
2KW power at 772rpm is supplied to the worm shaft. The number of starts for threads of worm are 3 with a 41mm pitch circle diameter. The worm wheel has 37 teeth with a 7mm module. The normal pressure angle is 20. Calculate efficiency of the worm gear drive. (Assume ยต=0.035)



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Designed by Dr. M. Raja Roy, Associate Professor, Mechanical Engg. Dept.