GrabCAD 模型信息
ENGINEERING GRAPHICS PART MODEL · 模型 310726
ORTHOGRAPHIC PROJECTION 1. Introduction to Orthographic Projection Orthographic projection is a method of representing a 3-dimensional object on 2-dimensional planes using multiple views. It is the most important method used in engineering drawing to express the exact shape and size of an object. The object is represented using the following views: • Front View (FV) • Top View (TV) • Side View (Left or Right) ________________________________________ 2. Principle of Orthographic Projection Orthographic projection is based on the principle of projecting points of an object perpendicularly onto reference planes. The two planes used are: 1. Horizontal Plane (HP) 2. Vertical Plane (VP) The line of intersection of these planes is the XY line. 3. First Angle Projection (Used in India) The uploaded drawing sheet uses First Angle Projection, as indicated in the title block. In First Angle Projection: • The Top View is drawn below the XY line. • The Front View is drawn above the XY line. • The Left Side View is drawn to the right of the Front View. Why this arrangement? Because in First Angle Projection, Object is placed between the observer and the plane of projection. 4. Understanding the Uploaded Part (Stepped Block) The model consists of: • A square block of 80 mm × 80 mm • Three steps, each of 20 mm height and 20 mm width • Depth of block: 60 mm The object contains visible edges and hidden edges which must be represented properly in different views. 5. Orthographic Views of the Model (A) Front View (FV) From the front: • All three steps are visible. • No hidden lines are required. • The view shows a stepped profile. • Height = 80 mm • Width = 80 mm This view gives the true shape of the stepped profile. (B) Top View (TV) From the top: • The depth of the block (60 mm) is visible. • The recess of steps is not visible from the top → Hence hidden lines are used. • Three vertical hidden lines (each spaced 20 mm). This view shows: • True width = 80 mm • True depth = 60 mm • Hidden internal shape (C) Left Side View (LSV) From the left: • Height = 80 mm • Depth = 60 mm • Steps are hidden → shown with three horizontal dashed lines This view helps to understand the internal shape along the depth. 6. Use of Hidden Lines Hidden lines (dashed lines) are used because: • The steps lie behind the front face of the block (in TV and LV). • They help visualize the internal layout of the object. • According to BIS standards: • Hidden line thickness = thin line • Representation =
- 格式
- SOLIDWORKS、Rendering、STEP / IGES
- 分类
- Components、Industrial design、Machine design
- 标签
- engineeringgraphics eg engineeringdrawing technicaldrawi
- 数据更新
- 2026-10-26T15:01:54Z
