1. Multiview and 3D Drawings
By Carlin Bright

2. Axonometric Projections
A 3D projection that allows you to see all three axes

3. Axonometric Projections
Isometric – all three axes are at the same scale
Dimetric – only two axes at the same scale (example, oblique)
Trimetric – all three axes at different scales

4. Axonometric Projections

5. Isometric Projections
All three axes are the same scale and there is 120° between each axis

6. Isometric Projections
Use a special grid paper when sketching

7. Isometric Projection
Isometric
All lines parallel to the axes are called “isometric lines”
All lines not parallel to the axes are “non-isometric lines,” which means they CANNOT be measured along the same scale as the isometric lines
Non-Isometric

8. Dimensioning
Extension lines should continue along axes

9. Oblique Projection A type of dimetric projection
Two axes are perpendicular to each other
The third axis is at an arbitrary angle, usually 30° or 45°

10. Orthographic Projections
Like the single view drawings we have been doing, ORTHOGRAPHIC PROJECTIONS look at one side of an object

11. Orthographic Projections
MULTIPLE orthographic projections are necessary to fully define an object

12. Orthographic Projections
Imagine the object you are going to draw is in a glass box, with the large flat surfaces of the object parallel to the walls of the box
As you look directly at each side of the box you see what would be visible in the total of 6 different views (top, bottom, front, back, left, and right)

13. Orthographic Projections

14. Orthographic Projections
Projections are arranged in this standard way:
TOP
REAR LEFT FRONT RIGHT
BOTTOM

15. Orthographic Projections

16. Orthographic Projections
How many views should you include in a multiview?
Only as many as is needed to define the object

17. Orthographic Projections
Hidden and Center Lines are used the same as in single view

18. Orthographic Projections
Use a miter line to transfer depth from the top to the side view, or vice versa

19. Orthographic Projections

20. Orthographic Projections
Important vocab:
Adjacent view – a view that is next to the view you are looking at (the front and side views)
Central view – a view that is between two other views (the front view)
Related views – views that are adjacent to a central view (the top and side views)

21. Dimensioning
When dimensioning a multiview drawing (top, front, and side), only use as many dimensions as needed to fully define
Example, the WIDTH of a drawing does not need to be included on the top view and the front view, just one or the other

22. Review