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 21 teeth pinion meshing with a 86 teeth gear. The pinion rotates at 989rpm. The normal pressure angle is 20. while the helix angle is 25. The face width is 56mm and the normal module is 6mm. The pinion as well as gear are made of steel 40C8(Sut=609N/mm2) and heat treated to a surface hardness of 446BHN. Find the Beam Strength and Wear Strength


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Problem-2


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Pb-2
1KW power at 782rpm is supplied to the worm shaft. The number of starts for threads of worm are 3 with a 44mm pitch circle diameter. The worm wheel has 30 teeth with a 14mm 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.