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AUTOCAD LECTURE 5ORTHOGRAPHIC VIEWS IN AUTOCAD

University of Illinois at ChicagoME250, Spring 2014

By Sin-Pui Fu2 April 2014

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OBJECTIVE

Layer propertiesOffsetHidden line

CenterlineOrthographic views

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REVIEW OF O RTHOGRAPHIC VIEWS

Orthographic views are 2-D views of 3-D objects.

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Engineering Graphics with Autocad2002, James D. Bethune Fig 5-1

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Third Angle Orthographic View

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L AYER

Use layers to control the visibility of objects and toassign properties such as color and linetype.

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L AYER AND CNC MACHINE S ETTING Layer setup is very important to convert the cad drawing to CAMsoftware for CNC machine. For example: you may need to set up the

cut depth by layer, etc..

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L AYER PROPERTIES

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Click the icon to manage the layers

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Layer On/ Off Add New Layers

Select Color

Select Linetype

Select Lineweight

Non-print/ Print layer

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LINEWEIGHT

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CONSTRUCTION LINE

Command xl Lines that extend to infinity in one or both

directions, known as rays and construction lines,respectively, can be used as references for creatingother objects.

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Construction Line

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Create Front View. Use rays to transfer Front View geometry to Top View.

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Create a 45 ray from top right corner of Front View

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Use Rays to transfer Top & Front View geometries to Side View.

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Delete Rays or turn off layer.

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CONSTRUCTION LINE LAYER

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Select cyan color

Use Continuous Line

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CENTER LINE

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Centerlines represent holes in orthographic views

Center Line

Center Line

Center Line

Engineering Graphics with Autocad2002, James D. Bethune Fig 5-45

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CREATE CENTER LINE LAYER

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Select red color

Load linetype andchoose Center

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HIDDEN LINE

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Hidden lines are used to represent surfaces thatare not directly visible in an orthographic view.

Engineering Graphics with Autocad2002, James D. Bethune Fig 5-9

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CREATE H IDDEN LINE LAYER

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Rename the layer, Select the color and linetype

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S ELECTING LINETYPE

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Select blue color

Load linetype andchoose HIDDEN

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COMMAND : OFFSET

Offset an object at a specified distance or through apointStep1: Type command offset

Step2: specify the distance

Step3: select a objectStep4: specify the displacement

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P ROCEDURE

Step1: create construction line, hidden line andcenter line layersStep2: select construction line layer and draw

two construction linesStep3: use offset function to specify the distancesStep4: use line function to draw the objectStep5: draw hidden line

Step6: draw center lineStep7: Type LTS to change the line type scale toshow dash lineStep8: attach Titleblock

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