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 9: Creating Arcs, Donuts, Ellipses, Points and Polygons
These drawings commands will be discussed in turn using DEMODRG. The commands can be activated from the toolbar, menu bar or by keyboard entry and both co-ordinate entry and referencing existing objects (using OSNAP) will be demonstrated.
Getting started
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Open your C:\MYCAD\DEMODRG to display the squares, circles and object snap lines.
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Erase the objects created during the object snap exercise.
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Refer to Figure 9.1 and activated the Draw, Modify and Object Snap toolbars.
Figure 9.1: Creating arcs, donuts and ellipses using C:\MYCAD\WORKDRG.
Arcs
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There are 10 different arc creation methods.
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Arcs are normally drawn in an anti-clockwise direction with combinations of the arc start point, end point, centre point, radius, included angle, length of arc, etc.
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We will investigate four different arc creation methods as well as continuous arcs. You can try the others for yourself.
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Center, Start, End
From the menu bar select Draw-Arc-Center, Start, End and:
prompt
Specify center point of arc
respond
Snap to Intersection icon and pick point B
prompt
Specify start point of arc
respond
Snap to Midpoint icon and pick line CD
prompt
Specify end point of arc
respond
Snap to Nearest icon and pick a point on line EF
and
arc A1 created.
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Start, Center, Angle
Menu bar with Draw-Arc-Start, End, Angle and:
prompt
Specify start point of arc
enter
30,30
prompt
Specify centre point of arc
respond
Snap to Centre icon and pick circle C1
prompt
Specify included angle
enter
270
and
arc A2...
Copyright Bob McFarlane 2006 under license agreement with Books24x7
