1. Auxiliary Views
In creating the Auxiliary View you measure the distance for the front view to top view

2. Primary Auxiliary View
Definition: Any view that is projected from (adjacent to) one of the principle views and which is not parallel to any of the principle plane
A primary auxiliary view is perpendicular to only one of the principle planes
Any inclined surface may be shown in true shape in the appropriate primary auxiliary view
If the fold line for an auxiliary view is parallel to the edge view of an inclined surface the inclined surface will appear in true shape in the auxiliary view

3. Lines
A line which is parallel to a fold line will appear true length in the adjacent view
A true length line which is perpendicular to a fold line will appear as a point in the adjacent view
Line 1-3 is parallel to the fold line in the right side view and true length line in the front view
Line 1-2 is true length in the right side view and is a point in the front view
A line which does not appear true length in any of the principle views is called an oblique line

4. Secondary Auxiliary Views
Definition: A secondary auxiliary view is any view which is not perpendicular to any of the principle views
Purpose: A secondary auxiliary view is used to show the true shape of an oblique surface
A secondary auxiliary view is constructed as an auxiliary view to a primary auxiliary view using fold lines and perpendicular projectors

5. Example: Secondary Auxiliary View
A true length line is identified in the right side view
line 2-4 is parallel to the fold line in the front view, therefore line 2-4 is a true length line in the right side view
A fold line perpendicular to the true length line gives the edge view of the oblique surface

6. Creating Auxiliary Views
A fold line that is parallel to a line gives a view that shows the “true length” of the line
A fold line that is perpendicular to a “true length” line on a surface gives a view that shows the surface as an edge.
A fold line that is parallel to the edge view of a surface gives a view that shows the “true shape”