4-10 Sample Problem SP4-2
Sketch the object shown in Figure 4-18. Do not include dimensions, but keep the object proportional.
Use the overall dimensions of the object to sketch a rectangular prism of the correct proportions. This is a critical step. If the first attempt is not proportionally correct, erase it and sketch again until a satisfactory result is achieved. See Figure 4-19.
Sketch the cutout.
Sketch the rounded surfaces. Note how axis lines are sketched and the elliptical shape added. Tangency lines are added, and visually incorrect lines are erased.
Sketch the holes. The holes are located by locating their centerlines and then sketching the required ellipses.