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ENGINEERING, CS 2019 HSC 5 MC

Using computer-aided drawing (CAD) software a new outline was produced 18.32 mm away from the original outline of an item as shown.
 

Which CAD command can produce this result most efficiently?

  1. Trim
  2. Offset
  3. Mirror
  4. Expand
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`B`

Show Worked Solution

→ Although there is some disparity between certain CAD programs, this is generally achieved using the offset tool.

`=>B`


♦♦♦ Mean mark 20%.

ENGINEERING, CS 2022 HSC 9 MC

Which of the following is an advantage of modelling in 3D computer aided drawing (CAD)?

  1. It allows for rapid prototyping.
  2. The design process is automated.
  3. The models can be intricate and complicated.
  4. It allows for finer tolerances than instrument drawing.
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`A`

Show Worked Solution

→ Rapid prototyping allows designers to quickly create new concepts on a theme and show visual representations to interested parties. This is a key advantage of CAD drawing.

`=>A`


♦♦♦ Mean mark 30%.

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