Summary Engineering Graphics and design

The document titled "Orthographic Projections-1 (2016)" by Dr. Akhilesh Kumar Maurya serves as a comprehensive guide to the principles and practice of orthographic projection, a fundamental technique in engineering drawing. It begins by defining orthographic projections as a method of representing a three-dimensional object through multiple two-dimensional views projected onto reference planes: the horizontal plane (HP), vertical plane (VP), and profile plane (PP). The document explains how each of these planes corresponds to standard views—front view (FV), top view (TV), and side view (SV)—and emphasizes the proper notations and terminologies used in technical drawings. It categorizes projection methods into types such as parallel, orthogonal, and oblique, and distinguishes between pictorial, perspective, and multiview drawings, discussing their respective advantages and limitations. A significant portion of the material is dedicated to explaining the first angle and third angle projection systems, which are used in different parts of the world (e.g., first angle in Europe and third angle in North America and parts of Asia). Diagrams illustrate how views are arranged based on these systems using concepts like the glass box method and folding lines. The guide provides detailed procedural steps for selecting and drawing views, including orientation, front view selection, and the appropriate choice of adjacent views. These steps aim to minimize hidden lines and optimize spatial layout on drawing sheets. The document also addresses how to decide the number of views required—highlighting cases where one or two views suffice—based on object complexity and symmetry. The final section includes multiple worked examples that challenge the reader to interpret 3D pictorial views and translate them into accurate orthographic drawings using the first angle method, reinforcing practical understanding through visual application.