CE En 112 Engineering Drawing with CAD Application. Chapter 2: Sketching and Text (Lecture B) Multiview Drawings. Lecture Outline. Objectives Projection methods (2.4, p.85) Multiview projections (2.4.4, p.93) Multiview sketches (2.6, p.99) Visualization (in the PP file only)
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Chapter 2: Sketching and Text (Lecture B)
Locate multiview projections in the taxonomy of projections:
Projection Parallel Projections Orthographic Projections Multiview Projections
Multiview projection is an orthographic projection for which the object is behind the plane of projection and oriented such that only two of its dimensions are shown
Object suspended in a glass box, producing the six principal views
Six Principal ViewsSee also Figure 2.35 in text
Multiview Projections (con’t)
Most Descriptive Views
(More visible lines better)
Step 1: Block in the front, top, and right side views. Sketch the front view first using construction lines to project dimensions
Step 2: Lightly block the major features in views
Step 3: Use construction lines to project the location and size of features between views
Step 4: Finish adding the final linesMultiview Sketches (con’t)
Normal, Inclined, or Oblique?
A: parallel to frontal plane
B: parallel to horizontal plane
C: parallel to profile plane
D: inclined – on edge in front view
E: oblique – neither parallel or on edge in any plan or view
There are several examples of multiview representations in this and other texts. The best method to learn the art of multiview representation of 3D objects is to draw by yourself, with tools or freehand, the objects in the Problems section of the text. We do not have time to cover all that are presented in the chapter. This section presents some examples of multiview representation.
This length has to be measured. And the curved line in top view must be drawn first. (The bottom plane is flat.)
Partial Profile Views to Describe an Object and Eliminate Hidden Lines
Partial View used on a Symmetrical Object
Revolution Conventions used to Simplify the Representation of Ribs and Webs
Make the drawings easy to understand!
Use overhead slides