Four strain gauges, with specification given below, are available to measure the torque on a cylindrical shaft 4 cm in diameter connecting a motor and load. (a) Draw clearly labelled….

## determine the velocity ratio, the torque ratio, and the gear ratio of the set.

Size the second-stage spur gears in Problem 12-55 for a bending factor of safety of at least 2.4 and a surface factor of safety of at least 2.0 assuming a steady torque, 25° pressure angle, full depth teeth, *Q*_{v }= 10, and AISI 4140 steel for all gears.

Size the third-stage spur gears in Problem 12-55 for a bending factor of safety of at least 2.4 and a surface factor of safety of at least 2.0 assuming a steady torque, 25° pressure angle, full depth teeth, *Q*_{v }= 10, and AISI 4140 steel for all gears.

The pinion of an external gearset has pitch radius *rp *= 40 mm and the gear has pitch radius *r*_{g}* *= 160 mm. If the pinion is the input member of the set, determine the velocity ratio, the torque ratio, and the gear ratio of the set.