Revolved Sections
Revolved sections show the shape of an object's cross-section superimposed on a longitudinal view as shown infigure 1.

Figure 1. Showing the revolved sections of (a) two hollow points joined together, (b) a Hand wheel (c) a long I- Joist.

While drawing the revolved sections of hand wheels, any part with an odd number of spokes or ribs will give an unsymmetrical and misleading section if the principle of true projections are strictly adhered to.  Therefore the normal practice is that the the spoke is rotated to the path of the vertical cutting plane and then projected on the side view as shown in figure 2 .Neither of the spokes should be sectioned (hatched).

Figure 2. illustrates the practice of drawing revolved section view of a hand wheel.