Engineering Design Graphics: Sketching, Modeling, and Visualization, 2nd Edition

CHAPTER 4

MULTIVIEWS

MULTIVIEW SKETCHING

Introduction-Justification and Some Characteristics

Multiview drawings are at the core of what has traditionally been thought of as engineering graphics. The purpose of a multiview drawing is to fully represent the size and shape of an object using one or more views. Along with notes and dimensions, these views provide the information needed to fabricate the part.

Chapter 3 included a brief discussion of the characteristics of multiview projection. These characteristics, as seen in Figure 4-1, include (1) parallel projectors normal to the projection plane and (2) the object positioned so that one principal face is parallel to the projection plane.

Figure 4-1 Pictorial view of the multiview projection process

As a consequence of this geometry, a multi-view drawing can show only one object face. This means that in most cases, more than one view is needed to fully describe the object. It is for this reason that this orthographic projection technique is called multiview projection.

Although only two of the three sets of linear dimensions (i.e., width, depth, height) are projected in any one view, all of this projected information parallel to the projection plane is directly scalable.

Glass Box Theory

Because more than one view is typically needed ...