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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
before after
rotateThe rotate command allows you to turn an object or drawing through a specified angle.
COMPUTER AIDED DRAWING