Repeat Problem 17.29D for the countershaft of Problem 16.16.

 

Problem 16.16

Repeat Problem 17.15 with a 3-in.-diameter shaft.

Problem 17.15

Determine the critical speed of rotation for the steel shaft shown in Figure P17.15.

Problem 17.29D

The pinion shaft involved in Problem 16.15 is to be designed.

(a) Draw load, shear force, and bending moment diagrams for the shaft, in both the horizontal and vertical planes. Also draw diagrams showing the shaft torsional and axial force loadings. (The desired diagrams include the seven shown in Figure 17.7c plus a similar diagram for axial load, with tension plotted as positive and compression negative.)

(b) What are the radial and axial loads applied to the bearings?

(c) Make a preliminary scale drawing of the shaft, with “reasonable-looking” diameters and with appropriate shoulders and other provisions for the axial retention of parts.

(d) What primary factors must be considered when determining appropriate numerical values of the diameters?

(e) Determine, at fatigue-critical location(s), an appropriate combination of design detail (such as fillet radius), shaft diameter, material and hardness, and surface finish.

(f) Select appropriate bearings, and add dimensions for all diameters shown in your drawing for part (c). (g) Determine the linear deflection at the gear and the angular deflection at the bearings.

 Figure 17.7c

Problem 16.15

Determine the critical speed of rotation for the steel shaft shown in Figure P17.15.