CAD Viewing and Coordinate System Commands

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CAD Viewing and Coordinate System Commands
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CAD Command Categories

• Object (draw, modify)
• View
• Coordinate System

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CAD Viewing Commands

• Control position from which an object is viewed
• Viewer moves, not the object
• 2D viewing controls
• Pan
• Zoom
• 3D viewing controls
• Compose pictorial and orthographic views

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Viewing in AutoCAD

• PAN
• Zoom
• 3DOrbit

• View Toolbar

• VPoint
• VIEW
• PLAN
• DView
• VPORTS

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CAD Coordinate Systems

• Governed by the Right Hand Rule
• Defines a workplane
• Unique, default global coordinate system
• Many user-defined, local coordinate systems

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Right Hand Rule - 1
Used to define the positive direction of the axes
of a three dimensional coordinate system

• Thumb indicates the positive x direction
• Index finger indicates the positive y direction
• Middle finger indicates the positive z direction
• Palm of the right hand represents the xy plane

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Right Hand Rule - 2
Variation used to determine direction of positive
rotation about an axis

• Right thumb aligned with positive axis direction
• Positive rotation indicated by direction of four
  fingers curling about axis

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WorkPlanes
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CAD Coordinate System Commands

• Creates a new, user-defined workplane
• Used to translate and/or rotate a coordinate
  system
• User-defined coordinate system assists in
  object/feature definition

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Coordinate Systems in AutoCAD

• Global coordinate system is called World
  Coordinate System (WCS)
• Defines a horizontal xy workplane
• Top (plan) view is default

• Local coordinate system is called User Coordinate
  System (UCS)
• User defined

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Coordinate System Control in AutoCAD

• UCS Toolbar

• UCS command
• UCSICON command

• ddUCs

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CAD Viewing and Coordinate System Commands

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