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COMPUTER AIDED DRAWING. Computer Aided Drawing (CAD) is where we produce our orthographic and 3D drawings using a computer software package. CAD has many advantages and disadvantages over traditional drawing on a drawing board with a pencil. Below is an example of a CAD drawing.

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COMPUTER AIDED DRAWING

Computer Aided Drawing (CAD) is where we produce our orthographic and 3D drawings using a computer software package. CAD has many advantages and disadvantages over traditional drawing on a drawing board with a pencil. Below is an example of a CAD drawing.

This graphic shows an example of a 3D drawing which was created as a line drawing and then rendered.

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COMPUTER AIDED DRAWING

ADVANTAGES

  • Drawings are more Accurate
  • Ease of modification / edit drawings
  • Standardisation of drawings
  • Drawings can be sent over large distances using e-mail.
  • Ability to use a library of commonly used shapes/drawings.
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COMPUTER AIDED DRAWING

DISADVANTAGES

  • Initial cost of hardware and software
  • Need to re-train staff
  • Computers may crash and drawings are lost
  • Security of files; files may be hacked
  • Need to update software
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COMPUTER AIDED DRAWING

These commands draw arcs, boxes, circles and ellipses quickly and accurately.

Common CAD Commands

Circle

Arc

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Ellipse

Box

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COMPUTER AIDED DRAWING

Common CAD Commands

Text

This command allows to add text or writing to a CAD drawing For example adding the labels to views.

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COMPUTER AIDED DRAWING

Common CAD Commands

Fillet

The fillet and chamfer are editing commands which allow you to create angled (chamfered) and rounded (filleted) corners.

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Chamfer

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COMPUTER AIDED DRAWING

Common CAD Commands

Trim/Break

The trim/break command allows to remove part of a line or object.

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COMPUTER AIDED DRAWING

Common CAD Commands

Copy

The copy command allows you to create duplicates of an drawing or image without having to draw the image each time.

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COMPUTER AIDED DRAWING

Common CAD Commands

Mirror

axis

The mirror command creates a mirror image copy of an object about a specified axis.

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COMPUTER AIDED DRAWING

Common CAD Commands

Zoom/Scale

The zoom/scale command allows the user to reduce or enlarge the size of an object.

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COMPUTER AIDED DRAWING

Common CAD Commands

Rectangular Array

The array commands creates multiple copies of an object in circular or rectangular arrangements.

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Polar Array

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COMPUTER AIDED DRAWING

Common CAD Commands

Hatch/Pattern Fill

The hatch/pattern fill command inserts a range of line patterns to specified areas within a drawing/object.

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COMPUTER AIDED DRAWING

Common CAD Commands

Delete

The delete command as the name suggests, removes a line or selected object.

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COMPUTER AIDED DRAWING

Common CAD Commands

rotate

The rotate command allows you to turn an object or drawing through a specified angle.

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COMPUTER AIDED DRAWING

TYPICAL EXAM QUESTION