• 1.4 Orthographic Projection & Hand Drawing

    • A. Learning Objectives

      • name some engineering drawing tools;
      • understand first angle orthographic projection;
      • transform isometric drawings into their first angle projection views.

    • B. Notes

      B1. Engineering Drawing Tools

      Drawing sheet, Drawing board, Mini drafter, T square, Compass, Divider, Set squares, Clinograph, Protractor, French curves, Templates, Pencils, Eraser ... (for more details)

    • Further study: Some useful skills for hand drawing

      *(Just for someone who wants to polish their hand drawing skills.)

    • B2. Orthographic Projections

      The orthographic projection system is used to represent a 3D object in a 2D plane from 3 orthogonal directions (up and down / left and right / top and bottom).

      There are two kinds of orthographic projection methods:
      • First angle projection (e.g. used in China, according to the Chinese National Standard of Technical Drawings)
      • Third angle projection (e.g. used in US, Canada, Japan and Australia) 

      Comparison between first angle and third angle projections:





      We will focus on : 

      First Angle Projection


      Symbol in the drawing: 


      Remarks
      LEFT VIEW is projected on the RIGHT of FRONT VIEW.
      RIGHT VIEW is projected on the LEFT of FRONT VIEW.
      TOP VIEW is projected on the BOTTOM of FRONT VIEW.




      Another example:



    • C. Coursework

      CW: Orthographic Projection Drawing

      The followings are show in perspective. 

      You may click the following TINKERCAD icons to copy and view them in parallel projections. 







    • Worksheet Solution 網址
      受限制的 無法使用，除非： {CW1-04 Orthographic Projection Drawing Worksheet (marked)} 活動已標示完成