Sketching pictorial

Think about these questions as you study the concepts in this chapter Why do engineers use pictorial sketching ... 

Pictorial sketching is the process of graphically representing objects in three-dimensional form. 

FIGURE 5-1 Engineer s pictorial sketches representing parts to a machine. 

The Six Sides of 3-D Objects No matter the type of pictorial sketch, every object is defined by six sides or views (also referred to as planes). This allows the viewer to understand the orientation and the relations of each side to the other sides. The six planes are front, right side, left side, top, back (or rear), and bottom. The front view is the anchor view all other views are established by identifying the front view first. But any pictorial sketch, no matter what the type, will only show three sides. Figure 5-5a demonstrates the relationship of each view (side) to the front view. The relationship of views also helps demonstrate the development of 2-D drawings, which only show two dimensions (see Figure 5-5b). 

Pictorial representation is divided into three groups. Two of these groups are demonstrated in this chapter. The three types of pictorial sketches are axonometric (meaning to measure along the axis), oblique, and perspective. Of the axonometric family of drawings, isometric sketching is the one used here (see Figure 5-6). 

Engineers use pictorial sketching because it represents how people naturally see the world. 

Why is it important for engineers and designers to develop the skill of pictorial sketching ... 

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