1. A 5-start wormset has l = 20°, C = 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.
