Answer :
Final answer:
The difference between 1st angle and 3rd angle orthographic projection lies in the placement of the object in relation to the plane of projection, affecting the placement and orientation of the views in the final drawing. The 1st angle projection results in views that are placed opposite to the observed reality, while the 3rd angle projection aligns with how views are naturally seen by the observer.
Explanation:
Orthographic projection is a technique used in engineering drawing to represent three-dimensional objects in two dimensions. The two main methods of orthographic projection are the 1st angle projection and the 3rd angle projection, which differ in the orientation of the projectors and the final placement of views.
In the 1st angle projection, the object is placed between the observer and the plane of projection. The views are projected onto the planes, which are then unfolded into a flat surface. This results in views that are opposite to what an observer would see. For example, the top view is placed beneath the front view, and the right side view appears on the left side when drawn.
In contrast, the 3rd angle projection places the plane of projection between the observer and the object. This more closely aligns with how the human eye perceives an object, with views placed in a way that represents looking directly at each face of the object. The top view is placed above the front view, and the right side view is on the right.
The distinction is crucial for engineers and drafters, as using the wrong projection can lead to misinterpretation of the drawings during manufacturing or assembly processes.
In third-angle projection, the view of a component is drawn next to where the view was taken. In first-angle projection, the view is drawn on the other end of the component, at the opposite end from where the view was taken.
First angle Protuberance is a system of creating a 2D delineation of a 3D object. It's substantially used in Europe and Asia and has not been officially used in Australia for numerous times. In Australia, third angle protuberance is the favored system of orthographic protuberance. Note the symbol for first angle orthographic protuberance
Third Angle Projection the Object is placed in the Third Quadrant. This means that the Vertical Aeroplane is in front of the object and the Vertical Aeroplane is above the object. These changes in the position of the views are the only difference between protuberance styles.
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