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It is required to design a two-stage spur gear reduction unit with 20∘ full depth involute teeth. The input shaft is connected to 10kW,1440rpm motor through a flexible coupling. The speed of the output shaft shall be approximately 180 rpm. The starting torque of a motor is 150% of rated torque. The gears are made of plain carbon steel with an ultimate tensile strength of 700 N/mm2 and heat treated to a surface hardness of 340 BHN. Design the gear and specify the dimensions.
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