1. Sketching Multiview Drawings
Introduction to Engineering DesignTM
Unit 1 – Lesson 1.2 – Intro to Technical Sketching
Sketching Multiview Drawings
Project Lead The Way, Inc.
Copyright 2007

2. Sketching Multiview Drawings
Introduction to Engineering DesignTM
Unit 1 – Lesson 1.2 – Intro to Technical Sketching
Multiview Drawing
A multiview drawing is one that shows two or more two-dimensional views of a three-dimensional object.
Multiview drawings provide the shape description of an object. When combined with dimensions, multiview drawings serve as the main form of communication between designers and manufacturers.
Project Lead The Way, Inc.
Copyright 2007

3. Sketching Multiview Drawings
Introduction to Engineering DesignTM
Unit 1 – Lesson 1.2 – Intro to Technical Sketching
Multiview Drawing
Project Lead The Way, Inc.
Copyright 2007

4. Sketching Multiview Drawings
Introduction to Engineering DesignTM
Unit 1 – Lesson 1.2 – Intro to Technical Sketching
Width, Depth, and Height
All three-dimensional objects have width, height, and depth.
Width is associated with an object’s side-to-side dimension.
Height is the measure of an object from top-to-bottom.
Depth is associated with front-to-back distance.
Project Lead The Way, Inc.
Copyright 2007

5. Sketching Multiview Drawings
Introduction to Engineering DesignTM
Unit 1 – Lesson 1.2 – Intro to Technical Sketching
Width, Depth, and Height
Project Lead The Way, Inc.
Copyright 2007

6. Sketching Multiview Drawings
Introduction to Engineering DesignTM
Unit 1 – Lesson 1.2 – Intro to Technical Sketching
Width, Depth, and Height
45°
Tell students: Notice how all views line up and construction lines can be used to help project the views from the first view drawn.
Project Lead The Way, Inc.
Copyright 2007

7. Sketching Multiview Drawings
Introduction to Engineering DesignTM
Unit 1 – Lesson 1.2 – Intro to Technical Sketching
Orthographic Projection
Orthographic projection is a technique that is used to create multiview drawings.
Orthographic projection is any projection of the features of an object onto an imaginary plane of projection. The projection of the features of the object is made by lines of sight that are perpendicular to the plane of projection.
Project Lead The Way, Inc.
Copyright 2007

8. Sketching Multiview Drawings
Introduction to Engineering DesignTM
Unit 1 – Lesson 1.2 – Intro to Technical Sketching
Orthographic Projection
The best way to understand orthographic projection is to imagine an object contained inside a glass box.
Project Lead The Way, Inc.
Copyright 2007

9. Sketching Multiview Drawings
Introduction to Engineering DesignTM
Unit 1 – Lesson 1.2 – Intro to Technical Sketching
Orthographic Projection
There is a total of six glass walls surrounding the object. Each wall represents a projection plane onto which a two- dimensional object view will be created.
Tell Students: Notice the six glass walls that represent planes and six views can be projected from this view. Three views are typically used and they are top, front, and right side. The opposite of each view being bottom, back, and left side also exist.
Project Lead The Way, Inc.
Copyright 2007

10. Sketching Multiview Drawings
Introduction to Engineering DesignTM
Unit 1 – Lesson 1.2 – Intro to Technical Sketching
Projection Plane
A projection plane, also referred to as a plane of projection or picture plane, is an imaginary surface that exists between the viewer and the object.
The projection plane is the surface onto which a two-dimensional view of a three-dimensional object is projected and created.
Project Lead The Way, Inc.
Copyright 2007

11. Sketching Multiview Drawings
Introduction to Engineering DesignTM
Unit 1 – Lesson 1.2 – Intro to Technical Sketching
Orthographic Projection
Start by focusing only on the front projection plane.
A person standing in front of the object would see only the five corners identified in black. 2 3 1 4
line of sight
at 90° angle to projection plane 5
Project Lead The Way, Inc.
Copyright 2007

12. Sketching Multiview Drawings
Introduction to Engineering DesignTM
Unit 1 – Lesson 1.2 – Intro to Technical Sketching
Orthographic Projection
Projection lines are used to project each corner outward until they reach the projection plane.
Project Lead The Way, Inc.
Copyright 2007

13. Sketching Multiview Drawings
Introduction to Engineering DesignTM
Unit 1 – Lesson 1.2 – Intro to Technical Sketching
Projection Lines
A projection line is an imaginary line that is used to locate or project the corners, edges, and features of a three-dimensional object onto an imaginary two-dimensional surface.
Project Lead The Way, Inc.
Copyright 2007

14. Sketching Multiview Drawings
Introduction to Engineering DesignTM
Unit 1 – Lesson 1.2 – Intro to Technical Sketching
Orthographic Projection
The visible edges of the object are then identified on the projection plane by connecting the projected corners with object lines.
Project Lead The Way, Inc.
Copyright 2007

15. Sketching Multiview Drawings
Introduction to Engineering DesignTM
Unit 1 – Lesson 1.2 – Intro to Technical Sketching
Orthographic Projection
The orthographic projection process is then repeated on the other projection planes.
Project Lead The Way, Inc.
Copyright 2007

16. Sketching Multiview Drawings
Introduction to Engineering DesignTM
Unit 1 – Lesson 1.2 – Intro to Technical Sketching
Sketching a Multiview Drawing
Given the overall dimensions of the object, a pencil, and a sheet of graph paper, a sketching multiview drawing can be easily done using points, construction lines, and object lines.
There are several ways to sketch a multiview drawing. Feel free to use the best way that make since to you. Teachers may choose to explain from the board or overhead using an example and have students follow along.
Project Lead The Way, Inc.
Copyright 2007

17. Sketching Multiview Drawings
Introduction to Engineering DesignTM
Unit 1 – Lesson 1.2 – Intro to Technical Sketching
Sketching a Multiview Drawing
Step #1: Calculate the amount of space that the views will take up.
Project Lead The Way, Inc.
Copyright 2007

18. Sketching Multiview Drawings
Introduction to Engineering DesignTM
Unit 1 – Lesson 1.2 – Intro to Technical Sketching
Calculating Required Space
12 spaces
Overall Multiview Sketch Height?
Overall Multiview Sketch Width?
18 spaces
Project Lead The Way, Inc.
Copyright 2007

19. Sketching Multiview Drawings
Introduction to Engineering DesignTM
Unit 1 – Lesson 1.2 – Intro to Technical Sketching
Sketching a Multiview Drawing
Step #1: Calculate the amount of space that the views will take up.
Step #2: Layout the boxes within which the individual views will occur using points and construction lines.
Project Lead The Way, Inc.
Copyright 2007

20. Sketching Multiview Drawings
Introduction to Engineering DesignTM
Unit 1 – Lesson 1.2 – Intro to Technical Sketching
Construction Line Layout
Project Lead The Way, Inc.
Copyright 2007

21. Sketching Multiview Drawings
Introduction to Engineering DesignTM
Unit 1 – Lesson 1.2 – Intro to Technical Sketching
Sketching a Multiview Drawing
Step #1: Calculate the amount of space that the views will take up.
Step #2: Layout the boxes within which the individual views will occur using points and construction lines.
Step #3: Identify the visible edges by drawing object lines on top of the construction lines.
Project Lead The Way, Inc.
Copyright 2007

22. Sketching Multiview Drawings
Introduction to Engineering DesignTM
Unit 1 – Lesson 1.2 – Intro to Technical Sketching
Object Line Layout
Project Lead The Way, Inc.
Copyright 2007

23. Sketching Multiview Drawings
Introduction to Engineering DesignTM
Unit 1 – Lesson 1.2 – Intro to Technical Sketching
A Question…
Each of the blocks at right has the same overall dimensions and color. What else do they have in common?
You could have students practice sketching the multiview drawings of these objects individually or in groups to help determine the answer before revealing it.
Project Lead The Way, Inc.
Copyright 2007

24. Sketching Multiview Drawings
Introduction to Engineering DesignTM
Unit 1 – Lesson 1.2 – Intro to Technical Sketching
A Question…
Each of the blocks at right has the same overall dimensions and color. What else do they have in common?
They all have identical top views!
Project Lead The Way, Inc.
Copyright 2007