For example, a sphere only requires one view, and a block only requires two views ) The front view The front view shows the most features or characteristics of the object. Some objects can be completely described in one or two views. It is not always necessary to use the three standard views. The other views (bottom, rear, left side) are omitted since they usually do not add any new information. The standard views used in an orthographic projection are the front, top, and right side views. Most objects require three views to completely describe them. The more complex a part, the more views are needed to describe it completely. What are the differences between the Right Side and Left Side views? What are the differences between the Top and Bottom, and Front and Rear views? Which view(s) have the least number of hidden or dashed lines? 2-6ĩ 2.4) THE STANDARD VIEWS When constructing an orthographic projection, we need to include enough views to completely describe the true shape of the part. 2-5Ĩ Instructor Led Exercise 2.3-1: Principle views Label the five remaining principle views with the appropriate view name.
2-3ħ Chapter 2: Orthographic Projection Figure 2.3-2: Glass box being unfolded. 2-2ĥ Figure 2.2-1: Orthographic projection ) The six principle views The 6 principle views of an orthographic projection are shown in Figure Each principle view is created by looking at the object in the directions indicated in Figure and drawing what is seen as well as what is hidden from view. These views together with dimensions and notes are sufficient to manufacture the part. Orthographic projections allow us to represent the shape of an object using 2 or more views. These drawings are formed by projecting the edges of the object perpendicular to the desired planes of projection. An orthographic projection is a system of drawings that represent different sides of an object.
2.2) ORTHOGRAPHIC PROJECTION INTRODUCTION An orthographic projection enables us to represent a 3-D object in 2-D (see Figure 2.2-1). Being able to visualize in your mind will help you in several aspects of critical thinking.
Engineering graphics with autocad 2014 pdf how to#
Engineering graphics teaches you how to visualize and see all sides of an object in your mind. It benefits everyone from the weekend carpenter who wants to draw plans for his/her new bookshelf to the electrical engineer who wants to analyze electrical component cooling using a CAE program. This is not to say that only students in a mechanical engineering curriculum will benefit from learning engineering graphics. Mechanical engineers draw parts and assemblies that need to be manufactured. Civil engineers draw plans for bridges and road layouts. For example, electrical engineers draw circuit schematics and circuit board layouts. Each engineering field has its own type of engineering drawings. An engineering drawing is a drawing or a set of drawings that communicates an idea, design, schematic, or model. 2.1) INTRODUCTION TO ENGINEERING GRAPHICS Engineering graphics is a set of rules and guidelines that help you create an engineering drawing. By the end of this chapter, you will be able to create a technically correct orthographic projection using proper projection techniques. Different line types are used to indicate visible, hidden and symmetry lines. It is a two dimensional representation of a three dimensional object. An orthographic projection describes the shape of an object. PUBLICATIONS Video instruction, interactive quizes and moreĢ Visit the following websites to learn more about this book:ģ ORTHOGRAPHIC PROJECTION CHAPTER OUTLINE 2.1) INTRODUCTION TO ENGINEERING GRAPHICS ) ORTHOGRAPHIC PROJECTION INTRODUCTION ) The six principle views ) THE GLASS BOX METHOD ) THE STANDARD VIEWS ) The front view ) LINE TYPES USED IN AN ORTHOGRAPHIC PROJECTION ) RULES FOR LINE CREATION AND USE ) Hidden lines ) Center lines ) Phantom lines ) Break lines ) Line type precedence ) CREATING AN ORTHOGRAPHIC PROJECTION ) Projection symbol ) AUXILIARY VIEWS ORTHOGRAPHIC PROJECTION CROSSWORD PUZZLE ORTHOGRAPHIC PROJECTION PROBLEMSĤ CHAPTER SUMMARY In Chapter 2 you will learn the importance of engineering graphics and how to create an orthographic projection. 1 Engineering Graphics Essentials with AutoCAD 2014 Instruction Text and Video Instruction Kirstie Plantenberg Multimedia Disc SDC Better Textbooks.
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