Orthographic Projection Auxiliary Views

Auxiliary View To accurately view the true dimensions of an inclined surface, one must create a view at 90 degrees from that inclined face. This is referred to as an Auxiliary View. This allows us to view the surface in its true size and shape.

Primary Auxiliary View In order to see a feature in it’s true size and shape, we must look at it straight on or perpendicular to the plane in which the feature exists. Note that in this view (the auxiliary view) the slotted hole is true size and shape. To obtain this view the auxiliary must be drawn from the view that allows the line of sight to be perpendicular to the desired feature. Line of sight. Many times a feature on a part cannot be seen in true size and shape. When this is the case we use an auxiliary view.

Secondary Auxiliary View Sometimes you may have a feature that is oblique in all three views. This type of feature needs two auxiliaries to obtain a perpendicular line of sight on that surface. We now can view a true length line and project with a line of sight perpendicular to the face we would like to see in true size and shape. Line of sight. In the first auxiliary we will try to obtain a view that is looking at the end of one line. Once this auxiliary is projected we then have a true length line Line of sight.