Auxiliary Views

Auxiliary Views Auxiliary view Orthographic projection of an angled surface Appears foreshortened in a typical multi-view drawing Auxiliary views are used to show true size and shape of angled surface features

Foreshortened Surfaces Foreshortened surfaces on multi-view drawings are unclear and inaccurate representation of size or shape View should not be dimensioned Foreshortened Face

Foreshortened Surfaces Auxiliary view is perpendicular to an angled surface Shows true size and shape of the surface features e.g., hole in surface as shown True Height Auxiliary Distance

Types of Auxiliary Views Three types of ordinary auxiliary views Depth auxiliary Height auxiliary Width auxiliary

Types of Auxiliary Views Depth auxiliary view derived from front or back view to show true depth Width auxiliary view derived from side view to show true width Height auxiliary view derived from top or bottom view to show true height

Creating Auxiliary Views Step #1 Multi-view drawing containing canted surface Example will be more clear with auxiliary view of canted surface on front view

Auxiliary Views Introduction to Engineering Design TM Unit 2 – Lesson 2.3 – Advanced Modeling Skills 1 2 3 4 5 6 7 8 9 1 2,9 3,8 4,7 5,6 1,2 3,4 5 6 8,7 9 1 2 3 4 5 6 7 8,9

Creating Auxiliary Views Step #2 Determine true dimension to show on auxiliary view Identify reference edges on existing view Draw appropriately spaced construction lines where auxiliary view will be drawn Construction lines are reference lines parallel to angled edge

Edge View of Reference Plane Auxiliary Views Introduction to Engineering Design TM Unit 2 – Lesson 2.3 – Advanced Modeling Skills Edge View of Reference Plane Reference Line

Creating Auxiliary Views Step #3 Draw construction lines outward from each corner of view Auxiliary view will be a 90° rotation of view Lines must be perpendicular to angled edge Identify relationship between object corners and construction line intersections

Auxiliary Views 1 2 3 4 5 6 7 8 9 2,9 3,8 4,7 5,6 8,9 1,2 3,4 8,7 Introduction to Engineering Design TM Unit 2 – Lesson 2.3 – Advanced Modeling Skills 4 3 6 2 1 5 8 7 9

Creating Auxiliary Views Step #4 Draw object lines to connect corners that share a visible edge

Auxiliary Views 4 3 6 2 1 5 8 7 9 2,9 3,8 4,7 5,6 8,9 1,2 3,4 8,7 Introduction to Engineering Design TM Unit 2 – Lesson 2.3 – Advanced Modeling Skills

Auxiliary view is projected from front view Auxiliary Views Introduction to Engineering Design TM Unit 2 – Lesson 2.3 – Advanced Modeling Skills Auxiliary view is projected from front view Shows true size and true shape of the angled surface If hole were located on surface, then it could be properly dimensioned

Partial Views Foreshortened object faces can be difficult to draw because of complex shapes or curves Short break lines and partial views simplify difficult curves on foreshortened faces while maintaining complete shape description

Partial Views short break lines