COMPUTER AIDED DRAWING

Computer Aided Drawing (CAD) is where we produce our 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.

COMPUTER AIDED DRAWING

•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.

COMPUTER AIDED DRAWING

•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

COMPUTER AIDED DRAWINGCommon CAD Commands

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Circle

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Box

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

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Ellipsebefore after

Arc

COMPUTER AIDED DRAWINGCommon CAD Commands

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

COMPUTER AIDED DRAWINGCommon CAD Commands

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Fillet

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Chamfer

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

COMPUTER AIDED DRAWINGCommon CAD Commands

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

COMPUTER AIDED DRAWINGCommon CAD Commands

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

COMPUTER AIDED DRAWINGCommon CAD Commands

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

COMPUTER AIDED DRAWINGCommon CAD Commands

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

COMPUTER AIDED DRAWINGCommon CAD Commands

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Rectangular Array

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Polar Array

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

COMPUTER AIDED DRAWINGCommon CAD Commands

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

COMPUTER AIDED DRAWINGCommon CAD Commands

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

COMPUTER AIDED DRAWINGCommon CAD Commands

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

COMPUTER AIDED DRAWING