3.1 Surface development

• Meaning and importance of surface development in sheet metal work
• Methods of surface development: straight line, parallel line, radial line and transition
• Drawing instruments and materials used for surface development
• Development of a cube and a rectangular prism
• Development of a cylinder and other prisms
• Development of a pyramid and a cone
• Development of truncated and intersecting surfaces
• Development of a transition piece by triangulation
• Bend allowance, seam allowance and marking out a development

• describe methods of surface development in sheet metal work
• construct surface developments of different figures used in sheet metal
• demonstrate how intersecting and truncated surfaces are drawn in Metalwork
• appreciate the use of surface development in sheet metal

“Why is the study of surface development important in Metalwork?”

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1. Surface development in sheet metal
   40 min · 1 practice tasks · quiz
   Introduce surface development and explain why it matters in sheet metal work.
2. Methods of surface development
   40 min · 1 practice tasks · quiz
   Describe the straight line, parallel line, radial line and transition methods.
3. Drawing instruments and materials
   40 min · 1 practice tasks · quiz
   Identify the drawing instruments and materials used for surface development.
4. Development of a cube
   40 min · 1 practice tasks · quiz
   Construct the surface development of a cube.
5. Development of a rectangular prism
   40 min · 1 practice tasks · quiz
   Construct the surface development of a rectangular prism.
6. Development of a cylinder
   40 min · 1 practice tasks · quiz
   Construct the development of a cylinder by the parallel line method.
7. Development of a triangular prism
   40 min · 1 practice tasks · quiz
   Construct the development of a triangular prism.
8. Development of a hexagonal prism
   40 min · 1 practice tasks · quiz
   Construct the development of a hexagonal prism.
9. Development of a square pyramid
   40 min · 1 practice tasks · quiz
   Construct the development of a square pyramid by the radial line method.
10. Development of a cone
    40 min · 1 practice tasks · quiz
    Construct the development of a cone by the radial line method.
11. Development of a truncated cone
    40 min · 1 practice tasks · quiz
    Construct the development of a truncated cone.
12. Development of a truncated pyramid
    40 min · 1 practice tasks · quiz
    Construct the development of a truncated pyramid.
13. Development of a transition piece
    40 min · 1 practice tasks · quiz
    Construct the development of a transition piece by triangulation.
14. The triangulation method
    40 min · 1 practice tasks · quiz
    Apply the triangulation method to surface development.
15. Intersecting surfaces
    40 min · 1 practice tasks · quiz
    Draw intersecting surfaces in sheet metal work.
16. Truncated surfaces
    40 min · 1 practice tasks · quiz
    Draw truncated surfaces and mark the cut on the development.
17. Bend allowance and seam allowance
    40 min · 1 practice tasks · quiz
    Allow for bends and seams when setting out a development.
18. Marking out and cutting the development
    40 min · 1 practice tasks · quiz
    Mark, cut and fold a surface development on sheet metal.
19. Surface development: review
    40 min · 1 practice tasks · quiz
    Review the methods, figures and skills of surface development.