Principles of Orthographic Projection Form of projection Types

Form of projection 投影的形成 Lines of projection 投射线 Projection 投影 Center of projection投射中心 Object

Central projection method ( The central projection is mainly used for the pictorial drawings

Three-view drawings 1. Form of three-view drawings A plan of an object is not

Three-view drawings 物体的三视图 1) Set up three-view projection system The three projection planes are

1) Positions 2) Rules The length of the front view and the top view

Slides: 6

Download presentation

Principles of Orthographic Projection Form of projection Types of projection Features of orthographic projection Three-view drawings Exercises

Form of projection 投影的形成 Lines of projection 投射线 Projection 投影 Center of projection投射中心 Object 物体 Plane of projection投影面

Central projection method ( The central projection is mainly used for the pictorial drawings of buildin ) Projection method Parallel projection method ( It is used in most engineering drawings. )

Three-view drawings 1. Form of three-view drawings A plan of an object is not always sufficient to describe it completely. Single orthographic projection

Three-view drawings 物体的三视图 1) Set up three-view projection system The three projection planes are orthogonal from each other. Make up of one projection system. X-axis→X轴 Y-axis→Y轴 Z-axis→Z轴

1) Positions 2) Rules The length of the front view and the top view should be aligned and is equal. Front view 主视图 Height align 高平齐 Left-side view 侧视图 Length align 长对正 Top view 俯视图 45º Width equality 宽相等主、俯视图长对正； The height of the front view and the left-side view should be aligned and is equal. 主、侧视图高平齐； The width of the top view and the left-side view should also be aligned and is equal. 俯、侧视图宽相等。