1. Using AutoCAD to Create Pictorial Drawings
Pictorials in AutoCAD
Using AutoCAD to Create Pictorial Drawings

2. Learning Objectives
Use AutoCAD to draw an oblique of an object given orthographic views of the object
Select the best orientation of an object in pictorial
Define what makes a drawing a: cavalier oblique, cabinet oblique, isometric, axonometric, perspective, or orthographic views
Sketch pictorials of an object (either oblique or isometric) given orthographic views of the object
Use AutoCAD to generate Isometric Drawings of objects given the orthographic views of the object.

3. Types Obliques Axonometrics Perspectives Cavalier Cabinet Isometrics
Others
Perspectives

4. Cavalier Oblique Front view true size
Receding Axis Angle (Normally 30°, 45° or 60°) is Variable
Depth dimension (receding axis) true size

5. Cabinet Oblique Front view true size
Receding Axis Angle (Normally 30°, 45° or 60°) is Variable
Depth dimension (receding axis) half size

6. Angles in Oblique Angles in front view are drawn true size
Other angles must be located using coordinates
Appearance of angles may be distorted

7. Obliques
Obliques are theoretical drawings. In reality, you can not actually view an object as an Oblique
Thin parts look very good as Obliques
Parts with angular features on multiple planes are difficult to draw as Obliques

8. Circles in Oblique Drawn true size in front view
Drawn as ellipses on receding planes
Layout using a Rhombus

9. Today’s AutoCAD commands
Drawing setup
Drawing Aids
Display control
ZOOM
General Concepts
Keyboard Coordinates
Editing and inquiry
MOVE
COPY
TRIM
Object Snap
ENDPoint
TANgent
NEArest

10. Drawing Obliques in AutoCAD
Initially you should make a rough sketch of the object to get an idea of what your drawing should look like
Draw the front view as a flat orthographic view
Use the COPY command along with keyboard coordinates to place the front view along the receding axis to represent all frontal surfaces in the object
Connect the copies with lines representing the depth of the object. Remember to use OSNAP to assist in this process
Use ERASE and TRIM as appropriate to remove unwanted lines/arcs

11. Example

12. Example

13. Construction of an oblique
Draw the front view using normal AutoCAD commands and techniques

14. Construction of an oblique
Use the COPY command to replicate the front view to depict the depth
Command: COPYE
Select objects: [Other corner:[ 11 found
Select objects:E
<Base point or displacement>/Multiple: mE
Base point: [
Second point of
Second point of
Second point of displacement:E

15. Construction of an oblique
Use the COPY command to replicate the front view to depict the depth
ERASE the portions of the depth profiles which will not be seen.

16. Construction of an oblique
Add receding lines using OSNAP and the LINE command.

17. Construction of an oblique
TRIM and ERASE the remaining lines which would not be visible.

18. Isometrics Axes equally separated (120°)
H, W, and D measurements are true size along iso. axes
Angles must be located by coordinates
Circles appear as ellipses on all surfaces

19. Drawing Isometrics in AutoCAD
Initially you should do a rough sketch of the object by hand to get an idea of what your drawing should look like
Switch the crosshairs to isometric mode
Draw the object using the LINE and ELLIPSE commands
Use F5 to toggle the current isometric plane
Use OTRHO and OSNAP to assist you in the drawing
TRIM or ERASE any portions which are not visible

20. Using isometric snap
If the crosshairs are not set in isometric mode, use the Drafting Settings dialog box.
Right click on snap button and choose settings

21. Drawing Ellipses
In isometrics, circular features which lie on the principal planes are shown as ellipses
These MUST be drawn using the ELLIPSE command with the Isocircle option

22. Exercise
Draw an Isometric pictorial of the object shown on the next slide using AutoCAD.
The grid is a .2” grid
Include centerlines

23. Isometric Example

24. Think-Pair-Share
Spend 3 minutes to list what don’t you understand about pictorials [at least 3 things]
Merge your list with the person sitting next to you, AND add 1 new item to the list. You have 3 minutes.
Spend 5 minutes sharing the results with another pair of students, delete questions that you can answer for each other, AND prioritize the remaining questions your list
We will discuss the results, and answer any remaining questions as a class.