## Find the pitch diameters of the worm and worm gear, the lead, and the axial pitch.

1.       A 5-start wormset has l = 20°, = 2.75 in, Ng = 33, and the angle between the shafts is 90°. Find the pitch diameters of the worm and worm gear, the lead, and the axial pitch.

2.       Size the bevel gears in Problem 13-40 for a bending factor of safety of at least 2.5 assuming a 5-year, 2-shift life, steady torque, quality index of 8, and an AISI 4140 steel pinion and gear.

3.       Size the bevel gears in Problem 13-40 for a minimum safety factor of 1.8 for any mode of failure of pinion or gear assuming a 5-year, 2-shift life, steady torque, quality index of 8, and an AISI 4140 steel pinion and gear.

4.       Size the spiral gears in Problem 13-41 for a bending factor of safety of at least 2.0 assuming a 7-year, 3-shift life, steady torque, quality index of 8, and an AISI 4340 steel pinion and gear.

### design suitable bearings to support the load for at least 5E8 cycles at 1 200 rpm using deepgroove ball bearings.

The shaft shown in Figure P11-4 was designed in Problem 10-19. For the data in row (a) of Table P11-1, and the corresponding diameter of shaft found in Problem 10-19,….

### Find the minimum film thickness for a long bearing with the following data: 30-mm dia, 130 mm long, 0.0015 clearance ratio, 1 500 rpm, ISO VG 100 oil at 200°F, and supporting a load of 7 kN.

1.       A paper machine processes rolls of paper having a density of 984 kg/m3. The paper roll is 1.50-m OD X 22-cm ID X 3.23-m long and is on a simply supported, 22-cm OD, steel….

### Find the minimum film thickness for a bearing with these data: 30-mm dia, 25 mm long, 0.0015 clearance ratio, 1 500 rpm, ON = 30, ISO VG 220 oil at 200°F.

1.       Problem 7-12 estimated the volume of adhesive wear to expect from a steel shaft of 40 mm dia rotating at 250 rpm for 10 years in a plain bronze….