Orthogonal Drawing – purpose and recognition of drawing types and projection


Engineering Studies – P1 Fundamental Engineering  –  Graphics

This topic covers the purpose and importance of orthogonal graphics in engineering. Third angle projection, drawing instruments, dimensioning and drawing standards are key concepts for this topic.

Key Concepts

  • Understanding the purpose and importance of orthogonal drawings in engineering
  • Recognition of orthogonal types of drawing
  • Applications of orthogonal graphics
  • AS100 Standards – Dimensioning, Projection, Material Lists, Scale, Layout.
  • Instruments
  • Freehand
  • Geometrical construction

Discussion Questions

  1. Explain the purposes of orthogonal drawings?
  2. Describe situations that an orthogonal drawings would be the best way to communicate.
  3. Explain the relevance of AS1100 Australian Drawing Standards.
  4. What are the differences between freehand and instrument drawing?
  5. What are line types?
  6. What is projection?
  7. What views are commonly drawn in orthogonal projection?
  8. What are viewing angles?
  9. Explain the 3rd Angle Drawing symbol.



Orthogonals - Mr Glenn Lawrence 143 V1
Top and Side Views in Orthogonal Projection - Fuse