If the spur gearsets in Problems 12-3 and 12-4 are compounded as shown in Figure 12-14 (p. 697), what will the overall train ratio be? – Essaylink

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1.       A paper machine processes rolls of paper having a density of 984 kg/m3. The paper roll is 1.50-m outside dia (OD) X 0.22-m inside dia (ID) X 3.23 m long and is on a simply supported, hollow, steel shaft with Sut = 400 MPa. Design a 2.5:1 reduction spur gearset to drive this roll shaft to obtain a minimum dynamic safety factor of 2 for a 10-year life if the shaft OD is 22 cm and the roll turns at 50 rpm with 1.2 hp absorbed.

2.       If the spur gearsets in Problems 12-3 and 12-4 are compounded as shown in Figure 12-14 (p. 697), what will the overall train ratio be?

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