1. Projections
Orthographic drawings – drawings where three views of an object are drawn in perpendicular planes to one another.

2. Orthographic Drawings
There are typically 3 views displayed in an Orthographic drawing
Top
Front
Side

3. Standard Views
The top view of an object shows the width and depth dimensions.
The front view of an object shows the width and height dimensions.
The side view of an object shows the height and depth dimensions.

4. Orthographic Views T F R.S.
Notice that the Top View is positioned above the front and they are aligned
The Right Side view is positioned to the right of the
front view and also aligned T F
R.S.

5. Orthographic Views T F R.S. The most important view is the Front View
The most important view is the Front View
You must determine which will be the front
Choose the view that is the longest and the one with the most detail T F
R.S.

7. Multiview Drawing

8. Orthographic Projection
Orthographic projection is a technique that is used to create multiview drawings.
Imagine a glass box

9. Try top view, side view and front view

10. Orthographic Projection
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

11. Orthographic Projection
Projection lines are used to project each corner outward until they reach the projection plane.

12. Orthographic Projection
The visible edges of the object are then identified on the projection plane by connecting the projected corners with object lines.

13. Orthographic Projection
The orthographic projection process is then repeated on the other projection planes.

14. Sketching Multiview Drawings
Introduction to Engineering DesignTM
Unit 1 – Lesson 1.2 – Intro to Technical Sketching
Completed Multiview Drawing
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.
Isometric (Pictorial) Orthographic
Project Lead The Way, Inc.
Copyright 2007

15. Object Line Layout

16. Sketching Multiview Drawings
Introduction to Engineering DesignTM
Unit 1 – Lesson 1.2 – Intro to Technical Sketching
Draw the top view of all four objects.
DO they have anything 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

17. They all have identical top views!