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ENGINEERING, TE 2019 HSC 27a

A telecommunications tower with repeater transmitters is shown. The tower is assembled from many individual parts.
 

Explain why detailed drawings are used in the design and manufacture of these individual parts.  (2 marks)

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→ A scaled ‘Detail Drawing’ is required for a Structural Engineer to communicate information regarding individual parts.

→ To ensure accurate manufacture of parts that fit together during assembly, the detailed drawing would use a suitable scale so all details are apparent (eg 2:1, 5:1 and 10:1).

→ There is a high risk of inaccurately manufactured parts if detailed drawings are not provided.

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→ A scaled ‘Detail Drawing’ is required for a Structural Engineer to communicate information regarding individual parts.

→ To ensure accurate manufacture of parts that fit together during assembly, the detailed drawing would use a suitable scale so all details are apparent (eg 2:1, 5:1 and 10:1).

→ There is a high risk of inaccurately manufactured parts if detailed drawings are not provided.

ENGINEERING, PPT 2021 HSC 27

In engineering practice, freehand sketching, technical drawing and computer aided drawing are used.

Explain the use of each of these drawing methods in engineering practice. Support your answer with relevant examples.   (8 marks)

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Freehand Sketching:

  • Quick, simple transfer of information
  • Conveys complex ideas visually without complex equipment
  • Only requires paper and pencil
  • Used onsite to resolve issues/explain ideas
  • Examples include concept sketches, illustrating modifications to a design

Technical Drawing:

  • Ensures projects are built to exact standards
  • Technical drawing standards ensure clear communication and no misunderstandings
  • Unambiguous graphical communication can transcend language barriers
  • Gives specific lengths, sizes and tolerances
  • Used for production of formal technical drawings for manufacturers

CAD:

  • Quickly creates technical drawings
  • Allows for quick collaboration and remote access
  • Fast electronic communication of ideas
  • Allows for more detail than technical drawings
  • Can produce 3D models
  • Can perform structural analysis
  • Can quickly create complex shapes
  • Linked to database of material costs to determine cost of project
  • Can be used along with CAM/CNC/3D printing to create prototypes and models
  • Examples include 3D drawing and detailed technical drawing of complex parts
Show Worked Solution

Freehand Sketching:

  • Quick, simple transfer of information
  • Conveys complex ideas visually without complex equipment
  • Only requires paper and pencil
  • Used onsite to resolve issues/explain ideas
  • Examples include concept sketches, illustrating modifications to a design

Technical Drawing:

  • Ensures projects are built to exact standards
  • Technical drawing standards ensure clear communication and no misunderstandings
  • Unambiguous graphical communication can transcend language barriers
  • Gives specific lengths, sizes and tolerances
  • Used for production of formal technical drawings for manufacturers

CAD:

  • Quickly creates technical drawings
  • Allows for quick collaboration and remote access
  • Fast electronic communication of ideas
  • Allows for more detail than technical drawings
  • Can produce 3D models
  • Can perform structural analysis
  • Can quickly create complex shapes
  • Linked to database of material costs to determine cost of project
  • Can be used along with CAM/CNC/3D printing to create prototypes and models
  • Examples include 3D drawing and detailed technical drawing of complex parts