Lecture Autodesk inventor: CAD viewing and coordinate system commands. The main contents of the chapter consist of the following: CAD command categories, CAD viewing commands, viewing in AutoCAD, CAD coordinate systems, right hand rule, CAD 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
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 userdefined, local coordinate
systems
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Right Hand Rule 1
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
Used to define the positive direction of the axes of a three dimensional coordinate
system
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Right Hand Rule 2
Right thumb aligned
with positive axis
direction
Positive rotation
indicated by direction
of four fingers curling
about axis
Variation used to determine direction of positive rotation about an 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 Userdefined
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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