Beginning AutoCAD 2006
Placing emphasis on learning by doing, this step-by-step guide provides a detailed exploration of AutoCAD functions required at each stage of producing a 2D drawing.
TABLE OF CONTENTS Beginning AutoCAD 2006
Chapter 32: Pictorial Drawings
Overview
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Pictorial drawings allow two-dimensional objects to be displayed in 3D.
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This is a very useful concept as it can convey additional information about a component which is not always apparent with the traditional orthographical views.
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The reader should always be aware that all pictorial drawings are themselves two-dimensional.
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I am constantly surprised that there are still 'draughtspersons' and teachers/lecturers who refer to an isometric as a 3D drawing. Nothing could be far from the truth. An isometric is a 2D representation of a 3D drawing and although as it appears to be displayed in 3D, the user should never forget that it is a 'flat 2D' drawing without any 'depth'.
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There are several pictorial visualisations available and in this chapter we will investigate three:
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isometric
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oblique
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planometric.
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Isometric drawings
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Isometric drawings are created with the X- and Y-axes at 30 degrees.
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User entry and accuracy is achieved with polar co-ordinates.
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Isometric drawings are created 'full-size'.
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AutoCAD has the facility to display an isometric grid as a drawing aid.
Setting the isometric grid
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There are two methods for setting the isometric grid:
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using a dialogue box
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via the keyboard.
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Open your A3PAPER then menu bar with Tools-Drafting Settings and:
prompt
Drafting Settings dialogue box with four tab selections:
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Snap and Grid
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Polar Tracking
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Object Snap
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Dynamic Input
respond
pick the Snap and Grid tab and:
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Snap On(F9) active tick
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Grid On(F7) active
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Snap type and Style with:
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Grid snap active black dot
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Isometric snap active
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set...
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Copyright Bob McFarlane 2006 under license agreement with Books24x7
