Short Answer
An auxiliary view is an additional projection used in engineering drawings to show the true shape and size of inclined surfaces. It is necessary when an object has features that are not parallel to the standard front, top, or side views, making it difficult to represent accurately in orthographic projection.
An auxiliary view is constructed by projecting the inclined surface onto a plane that is perpendicular to it. This process involves establishing a new projection plane, projecting points from the inclined surface, and drawing the required view, ensuring accurate measurements and avoiding distortion.
Detailed Explanation
Auxiliary View in Engineering Drawing
An auxiliary view is used when an inclined or oblique surface does not appear correctly in standard orthographic views. These views help engineers and manufacturers understand angled features, slanted holes, and complex geometries in a mechanical component.
- Purpose of an Auxiliary View
- Shows true dimensions of inclined surfaces.
- Eliminates distortion in orthographic projections.
- Helps in accurate machining and manufacturing.
- Types of Auxiliary Views
- Primary Auxiliary View: Projected directly from one of the principal views (front, top, or side).
- Secondary Auxiliary View: Projected from a primary auxiliary view for more complex objects.
How an Auxiliary View Is Constructed
- Identify the Inclined Surface
- Find the angled or slanted face in the orthographic views.
- Determine the projection direction needed to see the true shape.
- Set Up the Projection Plane
- Establish a new projection plane that is perpendicular to the inclined surface.
- This ensures the true shape is projected without distortion.
- Project Points to the New Plane
- Transfer key edges and points from the orthographic view.
- Maintain correct spacing and proportions while projecting.
- Draw the Auxiliary View
- Connect the projected points to form the true shape of the surface.
- Apply proper hatching if the sectioned view is required.
- Label and Dimension the View
- Clearly mark dimensions and reference lines to avoid misinterpretation.
- Ensure it aligns with engineering drawing standards (ISO, ANSI, BIS).
Conclusion
An auxiliary view is a projection used in engineering drawings to show the true shape of inclined surfaces. It is constructed by setting up a perpendicular projection plane, projecting key points, and drawing the accurate view. These views are essential in mechanical design, manufacturing, and quality control to ensure precise representation and error-free production.